Final California 2026 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name:	Mendocino Coast HU, Garcia River HA, Garcia River
Water Body ID:	CAR1137002619980709103133
Water Body Type:	River & Stream

DECISION ID	155311	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Temperature, water
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	Flow Alteration/Regulation/Modification | Removal of Riparian Vegetation
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twenty-nine lines of evidence are available in the administrative record to assess this pollutant. Zero of the 67 samples exceed the COLD objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. NUMBER of NUMBER samples exceeded the OBJECTIVE/GUIDELINE/CRITERIA and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. For BLUE WATERHOLE CREEK, there are four lines of evidence (LOEs 101000, 101315, 317921, 317924) and 0 of 10 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For GARCIA RIVER, there are ten lines of evidence (LOEs 101118, 101150, 318082, 318085, 318088, 318091, 318094, 318097, 318100, 318103) and 0 of 27 samples exceed the cold freshwater habitat beneficial use objective, which does not exceed the allowable frequency in Table 4.2 of the Listing Policy. For NORTH FORK GARCIA RIVER, there are two lines of evidence (LOEs 318344, 318347) and 0 of 4 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SOUTH FORK GARCIA RIVER, there are four lines of evidence (LOEs 101119, 101120, 101316, 318642) and 0 of 8 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For INNMAN CREEK, there are three lines of evidence (LOEs 101117, 101317, 318152) and 0 of 9 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MILL CREEK, there are two lines of evidence (LOEs 101318, 318313) and 0 of 3 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SIGNAL CREEK, there are two lines of evidence (LOEs 101319, 318626) and 0 of 7 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MENDOCINO COAST HU, GARCIA HA, GARCIA RIVER, there are two lines of evidence (LOEs 4752, 101383), which establish that data was assess prior to 2006 and the water temperature is not reflective of natural conditions. This listing applies to the entire waterbody.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:	For BLUE WATERHOLE CREEK, there are four lines of evidence (LOEs 101000, 101315, 317921, 317924) and 0 of 10 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For GARCIA RIVER, there are ten lines of evidence (LOEs 101118, 101150, 318082, 318085, 318088, 318091, 318094, 31809   DECISION ID 155311 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Temperature, water Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list)(2018) Revision Status Revised Sources: Flow Alteration/Regulation/Modification | Removal of Riparian Vegetation TMDL Priority: Low Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Twenty-nine lines of evidence are available in the administrative record to assess this pollutant. Zero of the 67 samples exceed the COLD objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. NUMBER of NUMBER samples exceeded the OBJECTIVE/GUIDELINE/CRITERIA and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. This listing applies to the entire waterbody. For BLUE WATERHOLE CREEK, there are four lines of evidence (LOEs 101000, 101315, 317921, 317924) and 0 of 10 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For GARCIA RIVER, there are ten lines of evidence (LOEs 101118, 101150, 318082, 318085, 318088, 318091, 318094, 318097, 318100, 318103) and 0 of 27 samples exceed the cold freshwater habitat beneficial use objective, which does not exceed the allowable frequency in Table 4.2 of the Listing Policy. For NORTH FORK GARCIA RIVER, there are two lines of evidence (LOEs 318344, 318347) and 0 of 4 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SOUTH FORK GARCIA RIVER, there are four lines of evidence (LOEs 101119, 101120, 101316, 318642) and 0 of 8 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For INNMAN CREEK, there are three lines of evidence (LOEs 101117, 101317, 318152) and 0 of 9 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MILL CREEK, there are two lines of evidence (LOEs 101318, 318313) and 0 of 3 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SIGNAL CREEK, there are two lines of evidence (LOEs 101319, 318626) and 0 of 7 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MENDOCINO COAST HU, GARCIA HA, GARCIA RIVER, there are two lines of evidence (LOEs 4752, 101383), which establish that data was assess prior to 2006 and the water temperature is not reflective of natural conditions. This listing applies to the entire waterbody.   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.   State Board Review of Regional Board Conclusion and Recommendation: For BLUE WATERHOLE CREEK, there are four lines of evidence (LOEs 101000, 101315, 317921, 317924) and 0 of 10 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For GARCIA RIVER, there are ten lines of evidence (LOEs 101118, 101150, 318082, 318085, 318088, 318091, 318094, 318097, 318100, 318103) and 0 of 27 samples exceed the cold freshwater habitat beneficial use objective, which does not exceed the allowable frequency in Table 4.2 of the Listing Policy. For NORTH FORK GARCIA RIVER, there are two lines of evidence (LOEs 318344, 318347) and 0 of 4 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SOUTH FORK GARCIA RIVER, there are four lines of evidence (LOEs 101119, 101120, 101316, 318642) and 0 of 8 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For INNMAN CREEK, there are three lines of evidence (LOEs 101117, 101317, 318152) and 0 of 9 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MILL CREEK, there are two lines of evidence (LOEs 101318, 318313) and 0 of 3 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SIGNAL CREEK, there are two lines of evidence (LOEs 101319, 318626) and 0 of 7 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listin7, 318100, 318103) and 0 of 27 samples exceed the cold freshwater habitat beneficial use objective, which does not exceed the allowable frequency in Table 4.2 of the Listing Policy. For NORTH FORK GARCIA RIVER, there are two lines of evidence (LOEs 318344, 318347) and 0 of 4 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SOUTH FORK GARCIA RIVER, there are four lines of evidence (LOEs 101119, 101120, 101316, 318642) and 0 of 8 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For INNMAN CREEK, there are three lines of evidence (LOEs 101117, 101317, 318152) and 0 of 9 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MILL CREEK, there are two lines of evidence (LOEs 101318, 318313) and 0 of 3 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For SIGNAL CREEK, there are two lines of evidence (LOEs 101319, 318626) and 0 of 7 samples exceed the cold freshwater habitat beneficial use objective, which is insufficient data to apply Table 4.2 of the Listing Policy. For MENDOCINO COAST HU, GARCIA HA, GARCIA RIVER, there are two lines of evidence (LOEs 4752, 101383), which establish that data was assess prior to 2006 and the water temperature is not reflective of natural conditions. This listing applies to the entire waterbody.   State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.   Listing Extent: Elevated temperatures impacting cold water fisheries in these reaches and sub_areas: Planning Units 113.70010 (Pardaloe Creek), 113.70011, 12, 13, 14, 20, 21 and the entire mainstem Garcia River from Pardaloe Creek to the estuary, which includes that portion of 113.70022, 23, 24, 25, and 26. February 2002- The Garcia River TMDL for sediment has been adopted by NCRWQCB and approved by SWRCB and Office of Administrative Law. It is possible that voluntary compliance with measures in this TMDL will improve conditions related to temperature prior to development of a TMDL for temperature. This listing applies to the entire waterbody.     Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101383   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: Not Specified Data Used to Assess Water Quality: The following process is utilized to interpret the narrative temperature objective in the Basin Plan for impairment assessments. Step 1: Determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No , then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired. Data Reference: Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.   SWAMP Data: Non-SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): The water temperatures of the Mendocino Coast HU, Garcia River HA, Garcia River do not reflect natural conditions as environmental factors that influence water temperature have been anthropogenically altered due road-related activities, forestry practices and ranching causing channel aggradation and pool infilling as well as changes in riparian shade cover, increased solar heating and changes in streamside microclimates (NCRWQCB Garcia River Action Plan 2001, SWRCB 2010) EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Steelhead, Chinook and Coho are present in the Mendocino Coast HU, Garcia River HA (Brown et al. 1991, Moyle et al., 2008, Myers et al., 1998, SWRCB-SWAMP 2010). Rearing occurs year round and spawning/incubation/emg Policy. For MENDOCINO COAST HU, GARCIA HA, GARCIA RIVER, there are two lines of evidence (LOEs 4752, 101383), which establish that data was assess prior to 2006 and the water temperature is not reflective of natural conditions. This listing applies to the entire waterbody.   State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.   Listing Extent: Elevated temperatures impacting cold water fisheries in these reaches and sub_areas: Planning Units 113.70010 (Pardaloe Creek), 113.70011, 12, 13, 14, 20, 21 and the entire mainstem Garcia River from Pardaloe Creek to the estuary, which includes that portion of 113.70022, 23, 24, 25, and 26. February 2002- The Garcia River TMDL for sediment has been adopted by NCRWQCB and approved by SWRCB and Office of Administrative Law. It is possible that voluntary compliance with measures in this TMDL will improve conditions related to temperature prior to development of a TMDL for temperature. This listing applies to the entire waterbody.     th="67%">Information pertains to the Mendocino Coast HU, Garcia River HA, Garcia River tr> Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101383   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: Not Specified Data Used to Assess Water Quality: The following process is utilized to interpret the narrative temperature objective in the Basin Plan for impairment assessments. Step 1: Determine if temperatures reflect natural conditions. If Yes, then the water body is not considered impaired, if No, then go to Step 2. Step 2: Determine if temperatures adversely affect beneficial uses. If Yes, then the water body is considered impaired, if No , then go to Step 3. Step 3: Determine if temperatures are increased by 5 degrees F. If Yes, then water body is impaired, if No, then water body is not impaired. Data Reference: Presentation: Interpreting Temperature Standards in the North Coast Region. North Coast Regional Water Quality Control Board.   SWAMP Data: Non-SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: EVIDENCE OF ALTERATION OF NATURAL RECEIVING WATER TEMPERATURES (NON-NATURAL TEMPS): The water temperatures of the Mendocino Coast HU, Garcia River HA, Garcia River do not reflect natural conditions as environmental factors that influence water temperature have been anthropogenically altered due road-related activities, forestry practices and ranching causing channel aggradation and pool infilling as well as changes in riparian shade cover, increased solar heating and changes in streamside microclimates (NCRWQCB Garcia River Action Plan 2001, SWRCB 2010) EVIDENCE OF SALMONID PRESENCE & LIFE CYCLE USE: Steelhead, Chinook and Coho are present in the Mendocino Coast HU, Garcia River HA (Brown et al. 1991, Moyle et al., 2008, Myers et al., 1998, SWRCB-SWAMP 2010). Rearing occurs year round and spawning/incubation/emergence occurs from October through April (Brown et al. 1991, Moyle et al., 2008, Myers et al., 1998). Core rearing is supported throughout the Garcia River. Guideline Reference: Action Plan for the Garcia River Watershed Sediment TMDL Guideline Reference: Garcia River TMDL Implementation and Bioassessment Monitoring (North Coast Region) Guideline Reference: Status of Coho Salmon In CA Guideline Reference: Status Review of Chinook Salmon from Washington, Idaho, Oregon and California Guideline Reference: Salmon, Steelhead, and Trout in California: Status of an Emblematic Fauna   Spatial Representation: Guideline Reference: Action Plan for the Garcia River Watershed Sediment TMDL Guideline Reference: Garcia River TMDL Implementation and Bioassessment Monitoring (North Coast Region) Guideline Reference: Status of Coho Salmon In CA Guideline Reference: Salmon, Steelhead, and Trout in California: Status of an Emblematic Fauna Guideline Reference: Status Review of Chinook Salmon from Washington, Idaho, Oregon and California   Spatial Representation: Information pertains to the Mendocino Coast HU, Garcia River HA, Garcia River Temporal Representation: Data are reflective of current conditions in this water body. Environmental Conditions: QAPP Information: Information is considered to be of adequate quality for the Integrated Report process. QAPP Information Reference(s):   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 4752   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: Not Specified Data Used to Assess Water Quality: This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. Data Reference: Placeholder reference pre-2006 303(d)   SWAMP Data: Non-SWAMP   Water Quality Objective/Criterion: Objective/Criterion Reference:   Evaluation Guideline: Guideline Reference:   Spatial Representation: Temporal Representation: Environmental Conditions: QAPP Information: Unspecified QAPP Information Reference(s):   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101150   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 10.3 - 11.7 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River at Eureka Hill Road (113GA2733). Temporal Representation: The samples were collected between the dates of 4/3/2012 - 11/27/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101120   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 12.7. degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Temporal Representation: Data are reflective of current conditions in this water body. Environmental Conditions: QAPP Information: Information is considered to be of adequate quality for the Integrated Report process. QAPP Information Reference(s):   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 4752   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: Not Specified Data Used to Assess Water Quality: This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. Data Reference: Placeholder reference pre-2006 303(d)   SWAMP Data: Non-SWAMP   Water Quality Objective/Criterion: Objective/Criterion Reference:   Evaluation Guideline: Guideline Reference:   Spatial Representation: Temporal Representation: Environmental Conditions: QAPP Information: Unspecified QAPP Information Reference(s):   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101150   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 10.3 - 11.7 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River at Eureka Hill Road (113GA2733). Temporal Representation: The samples were collected between the dates of 4/3/2012 - 11/27/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101120   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 12.7. degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) South Fork Garcia River below Fle Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) South Fork Garcia River below Fleming Creek (113GAR118). Temporal Representation: The samples were collected between the dates of 9/10/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101119   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 13.3 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) South Fork Garcia River above Garcia River (113GAR110). Temporal Representation: The samples were collected between the dates of 6/18/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Informatming Creek (113GAR118). Temporal Representation: The samples were collected between the dates of 9/10/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101119   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 13.3 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) South Fork Garcia River above Garcia River (113GAR110). Temporal Representation: The samples were collected between the dates of 6/18/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101316   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 18.1 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River below Mill Creek (113GAR105). Temporal Representation: The samples were collected between the dates of 6/20/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101319   Pollutant: Temperature, water LOE Subgroup: Pollutant-: 3px; font-smooth: always">Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101316   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 18.1 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River below Mill Creek (113GAR105). Temporal Representation: The samples were collected between the dates of 6/20/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101319   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 13.2 - 14 7 degrees C. Data Reference: Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 13.2 - 14 7 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Signal Creek at Big Cheese Road (113GAR178). Temporal Representation: The samples were collected between the dates of 8/31/2010 - 6/21/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101315   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 21.1 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Signal Creek at Big Cheese Road (113GAR178). Temporal Representation: The samples were collected between the dates of 8/31/2010 - 6/21/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101315   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 21.1 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Blue Waterhole Creek above Garcia River (113GAR112). Temporal Representation: The samples were collected between the dates of 8/22/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101117   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 15.7 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River at SFn="top" width="67%">Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Blue Waterhole Creek above Garcia River (113GAR112). Temporal Representation: The samples were collected between the dates of 8/22/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101117   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 15.7 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River at SF Garcia at Eagles Bend (113GAR030). Temporal Representation: The samples were collected between the dates of 8/28/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Temporal Representation: The samples were collected between the dates of 8/28/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101000   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 15.5 - 18.0 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Blue Waterhole Creek ~1.7mi above Garcia River (113PS0076). Temporal Representation: The samples were collected between the dates of 8/2/2012 - 8/22/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101000   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 15.5 - 18.0 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Blue Waterhole Creek ~1.7mi above Garcia River (113PS0076). Temporal Representation: The samples were collected between the dates of 8/2/2012 - 8/22/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101318   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101318   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 14.0 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Mill Creek above Redwood Creek (113GAR089). Temporal Representation: The samples were collected between the dates of 6/20/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101118   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 17.3 degrees C. Data Reference:" width="33%">Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 14.0 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Mill Creek above Redwood Creek (113GAR089). Temporal Representation: The samples were collected between the dates of 6/20/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101118   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Temperature. Data range from 17.3 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River at SF Garcia River (113GAR046). Temporal Representation: The samples were collected between the dates of 6/18/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101317   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 15.2 - 16.8 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference:   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Garcia River at SF Garcia River (113GAR046). Temporal Representation: The samples were collected between the dates of 6/18/2012. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 101317   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data for this water body to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Temperature. Data range from 15.2 - 16.8 degrees C. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Reference Condition Management Plan .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Inman Creek below Inman Road (113GAR011). Temporal Representation: The samples were collected between the dates of 9/1/2010 - 8/22/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Refer"left" valign="top" width="67%">Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: The samples were collected at 1 monitoring site(s) Inman Creek below Inman Road (113GAR011). Temporal Representation: The samples were collected between the dates of 9/1/2010 - 8/22/2011. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program   QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318626   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 5 samples are greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples are greater than the October-April maximum of 20 degrees Celcius, so that 0 of 5 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Signal Creek at Big Cheese Road; station code: 113GAR178. Temporal Representation: These samples were collected from 9/9/2013-7/23/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318626   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 5 samples are greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples are greater than the October-April maximum of 20 degrees Celcius, so that 0 of 5 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Signal Creek at Big Cheese Road; station code: 113GAR178. Temporal Representation: These samples were collected from 9/9/2013-7/23/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318642   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318642   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data from SWAMP RWB1 Monitoring and determined that 0 of 5 samples are greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples are greater than the October-April maximum of 20 degrees Celcius, so that 0 of 5 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected from sampling station name: South Fork Garcia River above Garcia River; station code: 113GAR110. Temporal Representation: These samples were collected from 9/2/2014-7/6/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318344   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data from SWAMP RWB1 Monitoring and determined that 0 of 5 samples are greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples are greater than the October-April maximum of 20 degrees Celcius, so that 0 of 5 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected from sampling station name: South Fork Garcia River above Garcia River; station code: 113GAR110. Temporal Representation: These samples were collected from 9/2/2014-7/6/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318344   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 2 samples were greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: North Fork Garcia above Bridge 9; station code: 113GAR244. Temporal Representation: These samples were collected on 7/19/2015 and 8/22/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318313   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 2 samples were greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Mill Creek above Redwood Creek; station code: 113GAR089. Temporal Representation: Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 2 samples were greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: North Fork Garcia above Bridge 9; station code: 113GAR244. Temporal Representation: These samples were collected on 7/19/2015 and 8/22/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318313   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 2 samples were greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Mill Creek above Redwood Creek; station code: 113GAR089. Temporal Representation: These samples were collected on 6/30/2015 and 5/30/2017. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318152   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the temperature data and determined that 0 of 5 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 5 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Inman Creek above Garcia River; station code: 113GAR023. Temporal Representation: These samples were collected from 8/5/2013-8/6/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP ign="top" width="67%">These samples were collected on 6/30/2015 and 5/30/2017. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318152   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the temperature data and determined that 0 of 5 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 5 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Inman Creek above Garcia River; station code: 113GAR023. Temporal Representation: These samples were collected from 8/5/2013-8/6/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318100   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assess the data and determined that 0 of 2 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River below Signal Creek; station code: 113GAR042. Temporal Representation: These samples were collected on 9/10/2013 and 8/16/2016. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318097   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 6 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 6 samples were greater than the May-September maxium of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP &nb  Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318100   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assess the data and determined that 0 of 2 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River below Signal Creek; station code: 113GAR042. Temporal Representation: These samples were collected on 9/10/2013 and 8/16/2016. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318097   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River below Mill Creek; station code: 113GAR105. Temporal Representation: These samples were collected from 6/30/2015-8/21/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318094   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 3 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 3 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling st">Number of Samples: 6 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 6 samples were greater than the May-September maxium of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River below Mill Creek; station code: 113GAR105. Temporal Representation: These samples were collected from 6/30/2015-8/21/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318094   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 3 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 3 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River at SF Garcia River; station code: 113GAR046. Temporal Representation: These samples were collected on 9/2/2014, 8/1/2017, and 7/10/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318091   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 4 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River at SF Garcia at Eagles Bend; station code: 113GAR030. Temporal Representation: These samples were collected on 7/23/2019-8/19/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s)ation name: Garcia River at SF Garcia River; station code: 113GAR046. Temporal Representation: These samples were collected on 9/2/2014, 8/1/2017, and 7/10/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318091   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 4 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 4 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River at SF Garcia at Eagles Bend; station code: 113GAR030. Temporal Representation: These samples were collected on 7/23/2019-8/19/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318088   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 3 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 3 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River above Signal Creek; station code: 113GAR015. Temporal Representation: These samples were collected on 9/9/2013, 6/22/2016, and 8/21/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318085   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 2 samples exceed the May-September minimum of 24 degrees Celcius and 0 of 0 samples exceed the October-April minimum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River above Olsen Gulch; station code: 113GAR084. Temporal Representation: These samples were collected on 7/20/2015 and 7/21/2015. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318082   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 2 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region<: SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318088   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 3 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 3 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River above Signal Creek; station code: 113GAR015. Temporal Representation: These samples were collected on 9/9/2013, 6/22/2016, and 8/21/2018. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318085   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 2 samples exceed the May-September minimum of 24 degrees Celcius and 0 of 0 samples exceed the October-April minimum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River above Olsen Gulch; station code: 113GAR084. Temporal Representation: These samples were collected on 7/20/2015 and 7/21/2015. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318082   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 2 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that su/td>   Spatial Representation: These samples were collected at sampling station name: Garcia River above Inman Creek; station code: 113GAR087. Temporal Representation: These samples were collected on 8/6/2013 and 8/6/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 317924   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined that 0 of 1 sample exceeds the May-September water quality objective of 24 degrees Celcius and 0 of 0 samples exceed the October-April water quality objective of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: This sample was collected at sampling station name: Blue Waterhole Creek at Hollow Tree Road; station code: 113W0010. Temporal Representation: This sample was collected on 8/6/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River above Inman Creek; station code: 113GAR087. Temporal Representation: These samples were collected on 8/6/2013 and 8/6/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 317924   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined that 0 of 1 sample exceeds the May-September water quality objective of 24 degrees Celcius and 0 of 0 samples exceed the October-April water quality objective of 20 degrees Celcius, so that 0 of 1 sample exceeds the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: This sample was collected at sampling station name: Blue Waterhole Creek at Hollow Tree Road; station code: 113W0010. Temporal Representation: This sample was collected on 8/6/2019. Environmental Conditions:   LOE ID: 317921   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 6 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined that 0 of 6 samples exceed the May-September water quality objective of 24 degrees Celcius and 0 of 0 samples exceed the October-April water quality objective of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Blue Waterhole Creek above Garcia River; station code: 113GAR112. Temporal Representation: These four samples were collected on 8/5/2013, 6/21/2016, 5/31/2017, and 8/20/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318103   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed the data and determined that 0 of 2 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the November-April maximum of 24 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: These samples were collected at sampling station name: Garcia River downstream of Rolling Brook Creek; station code: 113GAR061. Temporal Representation: These samples were collected on 9/3/2014 and 8/2/2017. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 318347   Pollutant: Temperature, water LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Spawning   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 2 samples were greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.  Guideline Reference: Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region   Spatial Representation: Theses samples were collected at sampling station name: North Fork Garcia River at Bridge 9; station code: 113NG0100. Temporal Representation: These samples were collected from 8/6/2019-8/19/2019. Environmental Conditions: QAPP Information: QAPP for SWAMP RWB1 Monitoring QAPP Information Reference(s): SWAMP QAPrP   d align="left" valign="top" width="33%">QAPP Information:	QAPP for SWAMP RWB1 Monitoring
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	317921
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Fish Spawning
Number of Samples:	6
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed data from parent project SWAMP RWB1 Monitoring and determined that 0 of 6 samples exceed the May-September water quality objective of 24 degrees Celcius and 0 of 0 samples exceed the October-April water quality objective of 20 degrees Celcius, so that 0 of 6 samples exceed the water quality objective.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.
Guideline Reference:	Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
Spatial Representation:	These samples were collected at sampling station name: Blue Waterhole Creek above Garcia River; station code: 113GAR112.
Temporal Representation:	These four samples were collected on 8/5/2013, 6/21/2016, 5/31/2017, and 8/20/2019.
Environmental Conditions:
QAPP Information:	QAPP for SWAMP RWB1 Monitoring
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	318103
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Fish Spawning
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed the data and determined that 0 of 2 samples exceed the May-September maximum of 24 degrees Celcius and 0 of 0 samples exceed the November-April maximum of 24 degrees Celcius, so that 0 of 2 samples exceed the water quality objective for temperature.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.
Guideline Reference:	Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
Spatial Representation:	These samples were collected at sampling station name: Garcia River downstream of Rolling Brook Creek; station code: 113GAR061.
Temporal Representation:	These samples were collected on 9/3/2014 and 8/2/2017.
Environmental Conditions:
QAPP Information:	QAPP for SWAMP RWB1 Monitoring
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 155311, Temperature, water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	318347
Pollutant:	Temperature, water
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Fish Spawning
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed temperature data for SWAMP RWB1 Monitoring and determined that 0 of 2 samples were greater than the May-September maximum of 24 degrees Celcius and 0 of 0 samples were greater than the October-April maximum of 20 degrees Celcius, so that 0 of 2 samples exceed the water quality objective.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Basin, Chapter III, General Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries states: Natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses. At no time or place shall the temperature of any COLD water be increased more than 5 degrees Fahrenheit (F) above natural receiving water temperature.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	According to Carter (2008) the lethal temperature for spawning, incubation, and emergence life stages are 20 degrees C. The lethal temperatures for adult migration and holding, and juvenile migration and rearing is 24 degrees C.
Guideline Reference:	Effects of Temperature, Dissolved Oxygen/Total Dissolved Gas, Ammonia, and pH on Salmonids. Implications for California's North Coast TMDLs. California Regional Water Quality Control Board, North Coast Region
Spatial Representation:	Theses samples were collected at sampling station name: North Fork Garcia River at Bridge 9; station code: 113NG0100.
Temporal Representation:	These samples were collected from 8/6/2019-8/19/2019.
Environmental Conditions:
QAPP Information:	QAPP for SWAMP RWB1 Monitoring
QAPP Information Reference(s):	SWAMP QAPrP

DECISION ID	168899	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Sediment
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Name:	Garcia River Sediment
TMDL Project Code:	95
Date TMDL Approved by USEPA:	03/07/2002
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Water Board Conclusion: This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle. No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Garcia River was listed for sediment in 1992. The The Garcia River Sediment TMDL was adopted as a Basin Plan amendment by the NCRWQCB and approved by the SWRCB and USEPA in March 2002. The Garcia Sediment TMDL document indicates that impairments will persist for decades, even in the eventuality that all responsible landowners implement aggressive erosion control measures This water segment-pollutant combination was moved off the section 303(d) list during the 2002 listing cycle. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. This listing applies to the entire waterbody. This listing applies to the entire waterbody.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:	This listing applies to the entire waterbody.
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:	This listing applies to the entire waterbody.

Line of Evidence (LOE) for Decision ID 168899, Sediment Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	1702
Pollutant:	Sediment
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:
Objective/Criterion Reference:
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information:	QA Info Missing
QAPP Information Reference(s):

DECISION ID	168899	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Sediment
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Name:	Garcia River Sediment
TMDL Project Code:	95
Date TMDL Approved by USEPA:	03/07/2002
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Water Board Conclusion: This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle. No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Garcia River was listed for sediment in 1992. The The Garcia River Sediment TMDL was adopted as a Basin Plan amendment by the NCRWQCB and approved by the SWRCB and USEPA in March 2002. The Garcia Sediment TMDL document indicates that impairments will persist for decades, even in the eventuality that all responsible landowners implement aggressive erosion control measures This water segment-pollutant combination was moved off the section 303(d) list during the 2002 listing cycle. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. This listing applies to the entire waterbody. This listing applies to the entire waterbody.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:	This listing applies to the entire waterbody.
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:	This listing applies to the entire waterbody.

Line of Evidence (LOE) for Decision ID 168899, Sediment Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	1702
Pollutant:	Sediment
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:
Objective/Criterion Reference:
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information:	QA Info Missing
QAPP Information Reference(s):

DECISION ID	101154	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Aldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3 of the Listing Policy. Under section 3 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 101154, Aldrin Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103225
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldrin.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 101154, Aldrin Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	119238
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 2 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 101154, Aldrin Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	102394
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 2 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

DECISION ID	157347	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty-nine lines of evidence are available in the administrative record to assess this pollutant. Zero of the 55 samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the 55 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322904
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2016-08-16
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322896
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322891
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323058
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322984
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2018-07-11
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103241
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103242
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103231
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2011-08-23
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103240
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103229
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103234
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103238
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103230
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
DECISION ID	101154	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Aldrin
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3 of the Listing Policy. Under section 3 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 101154, Aldrin Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103225
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aldrin.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect aquatic life in freshwater as criterion maximum concentration is 3 ug/L . This established criteria was divided by 2 in order to better represent a CMC value as specified in footnote g of Table (b)(1) of the California Toxics Rule, 2000.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 101154, Aldrin Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	119238
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 2 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin to protect of human health from the consumption of water and organisms is 0.00013 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 101154, Aldrin Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	102394
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 2 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. The established numeric criteria for aldrin criteria for the protection of human health from consumption of organisms only is 0.00014 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

width="33%">Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103236   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103032   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113PS0076) Temporal Representation: The samples were collected between the dates of 2012-08-02 and 2012-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323101   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2018-08-23 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323120   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch). Temporal Representation: The samples were collected between the dates of 2015-07-21 and 2015-07-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323065   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples:    

Pollutant:	Alkalinity as CaCO3
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty-nine lines of evidence are available in the administrative record to assess this pollutant. Zero of the 55 samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the 55 samples exceed the objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322904
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2016-08-16
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322896
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9). Temporal Representation: The samples were collected between the dates of 2015-07-20 and 2018-08-22 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323083   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323076   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek). Temporal Representation: The samples were collected between the dates of 2014-09-03 and 2017-08-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 322979   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322891
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323058
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	322984
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2018-07-11
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103235   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103237   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103232   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Benefici="0" cellpadding="0"> Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103241
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103242
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103233
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103231
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2011-08-23
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323021   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2015-07-01 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103227   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 322937   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 322923   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   %; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103240   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103229   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103234   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103238   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water

DECISION ID	157349	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Aluminum
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-five lines of evidence are available in the administrative record to assess this pollutant. One of 25 samples exceed the MUN beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 25 samples exceed the MUN beneficial use objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

of 2013-09-09 and 2018-08-23p;

Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323159
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/Criterio	Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103230
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.
Guideline Reference:	Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323204
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Temporal Representation: Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103236   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103032   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323181
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323221
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapteop" width="67%">0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113PS0076)
Temporal Representation:	The samples were collected between the dates of 2012-08-02 and 2012-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323101
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the datesr 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323242
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323251
Pollutant:	Aluminum
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323120
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch).
Temporal Representation:	The samples were collected between the dates of 2015-07-21 and 2015-07-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323065
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323241
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecor">2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9).
Temporal Representation:	The samples were collected between the dates of 2015-07-20 and 2018-08-22
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323083
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Proegions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.
Guideline Reference:	Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323244
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.
Guideline Reference:	Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1        Spatial Representation: The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323076   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek). Temporal Representation: The samples were collected between the dates of 2014-09-03 and 2017-08-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 322979   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323246
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.
Guideline Reference:	Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323254
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
&nbs>Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103235
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.
Guideline Reference:	Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103257
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103237
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103232
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Benefici>
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103248
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103251
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessmal Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103233
Pollutant:	Alkalinity as CaCO3
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Alkalinity as CaCO3.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103245
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323021   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2015-07-01 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103227   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Alkalinity as CaCO3. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 322937   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157347, Alkalinity as CaCO3 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 322923   Pollutant: Alkalinity as CaCO3 LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Alkalinity as CaCO3. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA recommended alkalinity criterion continuous concentration (CCC) for the protection of aquatic life in freshwater is a minimum value of 20,000 ug/L (4-day average). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   d>		Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103254   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103258   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103255   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
DECISION ID	157349	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Aluminum
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Twenty-five lines of evidence are available in the administrative record to assess this pollutant. One of 25 samples exceed the MUN beneficial use objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of 25 samples exceed the MUN beneficial use objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323159
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/CriterioIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103256   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103249   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level n Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate. Guideline Reference: Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323204   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103246
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103244
	Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323181   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323221   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chaptetd> Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 1   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103259   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Regionr 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323242   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323251   Pollutant: Aluminum   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103252   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103247   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103253   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

DECISION ID	103651	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Ametryn
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 103651, Ametryn Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103260
Pollutant:	Ametryn
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ametryn.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323241   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate. Guideline Reference: Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323244   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate. Guideline Reference: Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323246   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018) Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate. Guideline Reference: Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157349, Aluminum	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323254   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Aluminum. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1 &nbs

DECISION ID	161426	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

s.ca.gov/water_issues/programs/tmdl/records/region_1/2022/ref5888.xlsx">Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1

Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118818
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Cop;
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Basin Plan, 2018)
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The aluminum criterion for the protection of aquatic life, is pH, total hardness, and dissolved organic carbon (DOC) dependent. When total hardness or DOC data were not available, default values based on the level III ecoregions developed by U.S EPA were substituted (EPA, 2018). When pH data were not available, the median pH value for the ecoregion, a pH value from a comparable waterbody, or a pH value from a local study in the same waterbody was used as a comparable surrogate.
Guideline Reference:	Final Aquatic Life Ambient Water Quality Criteria for Aluminum. EPA-822-R-18-001. Washington, D.C.: Office of Water, USEPA.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103257
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118816
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103248   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103251   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessm always">Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103268
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118809
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responseent Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103245
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118801   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103254   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103258   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion:old; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103276
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2011-08-23 and 2011-08-23
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118803
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:		Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103255
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118798   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118805   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118794   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103256
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103249
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level ign="top" width="67%">Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323481
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek).
Temporal Representation:	The samples were collected between the dates of 2014-09-03 and 2017-08-02
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103246   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103244   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323376
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323487
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 1 of 5 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103259
Pollutant:	Aluminum
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2018-07-11
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323272
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103252   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103247   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157349, Aluminum Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103253   Pollutant: Aluminum LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Aluminum. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A for Aluminum is 0.2 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program     DECISION ID 103651 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Ametryn Final Listing Decision: Do Not List on 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: New Decision Revision Status Revised Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.   State Board Review of Regional Board Conclusion and Recommendation:   State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.   Listing Extent:     Line of Evidence (LOE) for Decision ID 103651, Ametryn Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103260   Pollutant: Ametryn LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Ametryn. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ametryn as a drinking water level is a concentration of 0.06 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   : left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 161426, Ammonia		Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323384   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323494   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323496   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9). Temporal Representation: The samples were collected between the dates of 2015-07-20 and 2018-08-22 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 26328   Pollutant: Ammonia as Nitrogen LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat Aquatic Life Use: Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Wildlife Habitat   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: None of the 4 ammonia as nitrogen samples collected from the Garcia River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008). Data Reference: Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)   Evaluation Guideline: Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)). Guideline Reference: National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology   Spatial Representation: Samples were collected from the Garcia River at 2 locations as follows: (1) the Garcia River at Eureka Hill Road (SWAMP Station ID 113GAREHR), and (2) the South Fork Garcia River (SWAMP Station ID 113GARSFK). Samples were collected from well-mixed flows in glides or riffles. Temporal Representation: Samples were collected as grab samples during 2 site visits from each site from May to June 2001. Environmental Conditions: There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. QAPP Information: Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002). QAPP Information Reference(s): Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103265   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2010-08-31 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103263   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR015) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2010-08-31 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s):    

Pollutant:	Ammonia
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118818
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Cotd>	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103262
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2010-09-01
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103264
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118816
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR015) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2010-08-31 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103266   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2010-08-31 Environm always">Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103268
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118809
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responseental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103271
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118815
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118801
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118795   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103276
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2011-08-23 and 2011-08-23
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118803
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118798
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103269   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 119588   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 104316   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113PS0076) Temporal Representation: The samples were collected between the dates of 2012-08-22 and 2012-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118805   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118794   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118810
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118819
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323481
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek).
Temporal Representation:	The samples were collected between the dates of 2014-09-03 and 2017-08-02
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118806   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323376   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323487   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2018-07-11 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323272   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103283   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103275   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR015) Temporal Representation: The samples were collected between the dates of 2011-08-23 and 2011-08-23 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103267   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118797   Pollut: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323384
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323494
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323496
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9).
Temporal Representation:	The samples were collected between the dates of 2015-07-20 and 2018-08-22
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 118802   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	26328
Pollutant:	Ammonia as Nitrogen
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Fish Migration | Fish Spawning | Freshwater Replenishment | Preservation of Rare & Endangered Species | Wildlife Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 ammonia as nitrogen samples collected from the Garcia River exceed the objective. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology
Spatial Representation:	Samples were collected from the Garcia River at 2 locations as follows: (1) the Garcia River at Eureka Hill Road (SWAMP Station ID 113GAREHR), and (2) the South Fork Garcia River (SWAMP Station ID 113GARSFK). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected as grab samples during 2 site visits from each site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (Puckett 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103265
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118808
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118804
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	TotalData and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2010-08-31
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103263
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2010-08-31
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103277
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples wertd>	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103262
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2010-09-01
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103264
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103270
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118807
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
& valign="top" width="33%">Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2010-08-31
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103266
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2010-08-31
Environmnbsp;
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118814
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103271
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118815
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	104305
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113PS0076)
Temporal Representation:	The samples were collected between the dates of 2012-08-02 and 2012-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118820
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:<"top" width="67%">PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118795
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103274
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118796
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323388
Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103269
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	119588
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	104316
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113PS0076)
Temporal Representation:	The samples were collected between the dates of 2012-08-22 and 2012-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2016-08-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323389   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2016-08-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323392   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323507   Pollutant: Nitrogen, ammonia (Total Ammonia)<; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118810
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118819
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118806
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Mendocino Coast HU, Garcia River HA, Garcia River Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2016-06-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323508   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9). Temporal Representation: The samples were collected between the dates of 2015-07-20 and 2018-08-22 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323509   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2018-08-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323512
LOE ID:	103283
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103275
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR015)
Temporal Representation:	The samples were collected between the dates of 2011-08-23 and 2011-08-23
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103267
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118797
Pollut	Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch).
Temporal Representation:	The samples were collected between the dates of 2015-07-21 and 2015-07-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323529
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323423
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323534
Pollutant:	Nitrogen, ammonia (Total Ammonia)	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118802
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118808
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118804
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-23
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323547
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323368
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323475
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103277
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103270
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118807
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
&idth="67%">1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323470
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 annbsp;
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118814
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323466
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323349
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Watetr>
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	104305
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Ammonia as N.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113PS0076)
Temporal Representation:	The samples were collected between the dates of 2012-08-02 and 2012-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	118820
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2018-07-11
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323456
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch).
Temporal Representation:	The samples were collected between the dates of 2015-07-21 and 2015-07-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323344
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2016-06-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323341
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323369
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323480
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek).
Temporal Representation:	The samples were collected between the dates of 2014-09-03 and 2017-08-02
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP

/td> Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103274   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 118796   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Ammonia as N. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323388   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2016-08-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323389   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for

DECISION ID	157350	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Anatoxin-A
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

n="left" valign="top" width="33%">Water Quality Objective/Criterion:

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323615
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including watelifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2016-08-16
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323392
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323507
Pollutant:	Nitrogen, ammonia (Total Ammonia)
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323619
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2017-09-06 and 2017-09-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2016-06-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 323508   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323624
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323589
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9).
Temporal Representation:	The samples were collected between the dates of 2015-07-20 and 2018-08-22
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323509
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323512
Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323595
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323596
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2017-09-06 and 2017-09-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323617
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as fo	Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch).
Temporal Representation:	The samples were collected between the dates of 2015-07-21 and 2015-07-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323529
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323423
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323534
Pollutant:	Nitrogen, ammonia (Total Ammonia)
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323621
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323622
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323623
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipatr>
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-23
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323547
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323368
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323475
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323470
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 anl & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek).
Temporal Representation:	The samples were collected between the dates of 2017-08-02 and 2017-08-02
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323598
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiingd 2018-08-23
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323466
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document.
Objective/Criterion Reference:	Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161426, Ammonia Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323349
Pollutant:	Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Wate/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek).
Temporal Representation:	The samples were collected between the dates of 2017-08-02 and 2017-08-02
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323605
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323613
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323604
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP

r Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2018-07-11 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323456   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch). Temporal Representation: The samples were collected between the dates of 2015-07-21 and 2015-07-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323344   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for AmmoniaNAFreshwater 2013 document. Objective/Criterion Reference: Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater 2013   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2016-06-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323341   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323369   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River). Temporal Representation: The samples were collected between the dates of 2014-09-02 and 2018-07-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 161426, Ammonia	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323480   Pollutant: Nitrogen, ammonia (Total Ammonia) LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Ammonia as N. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA Health Advisory for lifetime exposure to Ammonia as a drinking water level is a concentration of 30 mg/L Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek). Temporal Representation: The samples were collected between the dates of 2014-09-03 and 2017-08-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

DECISION ID	157333	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109335
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109348
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109345
Pollutant:	Arsenic
LOE Subgroup:
DECISION ID	157350	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Anatoxin-A
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

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Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323615
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including wateidth="67%">Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109341
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
r-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323619
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2017-09-06 and 2017-09-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109338   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109368   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323624
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323589
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2017-08-01 and 2017-08-01
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323595
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109374
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323596   Pollutant: Anatoxin-A LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L. Guideline Reference: Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2017-09-06 and 2017-09-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323617   Pollutant: Anatoxin-A LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Water Contact Recreation   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as fo Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109361   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109358   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing. Guideline Reference: Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2017-05-30 and 2017-05-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323621   Pollutant: Anatoxin-A LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 1   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Anatoxin-A. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L. Guideline Reference: Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109364   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Inf" width="33%">Temporal Representation: The samples were collected between the dates of 2017-05-30 and 2017-05-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323622   Pollutant: Anatoxin-A LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L. Guideline Reference: Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River). Temporal Representation: The samples were collected between the dates of 2017-08-01 and 2017-08-01 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323623   Pollutant: Anatoxin-A LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipaormation Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109354   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109351   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and resul & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L. Guideline Reference: Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek). Temporal Representation: The samples were collected between the dates of 2017-08-02 and 2017-08-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323598   Pollutant: Anatoxin-A LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Water Contact Recreation   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiinglts are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109352   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek).
Temporal Representation:	The samples were collected between the dates of 2017-08-02 and 2017-08-02
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323605
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323613
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Water Contact Recreation
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Cyanobacteria and Harmful Algal Bloom (CCHAB) Network established 20 ug/L of anatoxin-A as the water concentration protective of swimmers and other contact recreational users including water-skiing/jet-skiing, fishing, boating, sail boarding, and canoeing.
Guideline Reference:	Appendix to the CCHAB preliminary changes to the statewide voluntary guidance on cyanoHABs in recreational waters, January 2016. Appendix A. Description of cyanotoxin triggers in recreational waters.
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157350, Anatoxin-A Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323604
Pollutant:	Anatoxin-A
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Anatoxin-A.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters shall not contain toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life, as specified in subsection 3.3.16 of the 2018 Water Quality Control Plan for the North Coast Region (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for anatoxin-A for the protection of the Municipal beneficial use was developed by the Oregon Health Authority and is 0.7 ug/L.
Guideline Reference:	Oregon Harmful Algae Bloom Surveillance (HABS) Program Recreational Use Public Health Advisory Guidelines Cyanobacterial Blooms in Freshwater Bodies - Oregon Health Authority
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek).
Temporal Representation:	The samples were collected between the dates of 2017-05-30 and 2017-05-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP

ellspacing="0" cellpadding="0">   LOE ID: 109342   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109339   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109379   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic
DECISION ID	157333	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Arsenic
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109335
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109348
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109345
Pollutant:	Arsenic
LOE Subgroup:	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109356   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323694   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323645   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109341
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109338
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109368
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109381   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109371   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109372   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109336 width="67%">Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109374   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109361   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109358   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109365   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109369   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109375   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109364   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Infn="left" valign="top" width="33%">Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 118823   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(sormation Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109354   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109351   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and resu) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109346   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109349   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109352   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   1

Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109362
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPPellspacing="0" cellpadding="0">
Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109342   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109339   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Moni Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109359   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109378   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Qutoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109379   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323691
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109356   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323694   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323645   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   T-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157333, Arsenic

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
QAPP Information Reference(s):		SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323649
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323653
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323686
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109381
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109371
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109372
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109336
Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323648   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323687   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323685   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
M
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109365
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
&nbsendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323678   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323656   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323677   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   p; Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109369   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109375   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water    

Pollutant:	Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 103126, Atrazine Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109382
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Atrazine.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity."
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 103126, Atrazine Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109383
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Atrazine.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

n="left" valign="top" width="33%">Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 118823   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s

DECISION ID	166995	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Azinphos-methyl (Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

Line of Evidence (LOE) for Decision ID 166995, Azinphos-methyl (Guthion) Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	102282
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109346   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109349   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples:    

Pollutant:	Benthic Community Effects
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Two line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Six of the 32 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, there is no additional information indicating that a pollutant may be causing the impact to the benthic community. The habitat assessments scores almost all indicate that the habitat is likely intact. More information is needed to determine what is causing the impact the benthic community. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six of the 32 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, more information is needed to determine what is causing the impact the benthic community. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	96478
Pollutant:	Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:	Population/Community Degradation
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	30
Number of Exceedances:	6
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	The site had a CSCI score(s) of 2.187887292 1.048500329 1.016766472 0.757812836 0.886835738 0.502554686 0.949412777 0.752567063 1.08077%">1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157333, Arsenic Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109362
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP85321 0.803908365 0.733664254 0.823465282 1.01526193 0.891054035 0.906476023 1.190224608 0.998256874 0.849414675 The samples taken on 6/20/2011, 8/22/2011, 8/23/2011, 8/27/2012, 9/10/2012, 8/5/2013, 9/9/2013, 7/22/2014, 9/2/2014, & 9/3/2014 were averaged. 6 out of 30 of these exceed the water quality objective which does not support the aquatic life beneficial use.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.
Guideline Reference:	Bioassessment in complex environments: designing an index for consistent meaning in different settings
Spatial Representation:	These samples were collected at the following station: 113GAR089 113GAR105 113GAR011 113GAR015 113GAR046 113GAR010 113GAR062 113GAR030 113GAR118 113GAR038 113GAR087 113GAR178 113GAR042 113GAR112 113GAR023 113GAR110 113GAR061
Temporal Representation:	These samples were collected on: 6/20/2011 6/21/2011 8/22/2011 8/23/2011 6/18/2012 6/19/2012 8/27/2012 8/28/2012 9/10/2012 9/11/2012 8/5/2013 8/5/2013 8/6/2013 9/9/2013 9/10/2013 7/22/2014 7/23/2014 9/2/2014 9/3/2014
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP RWB1 Monitoring.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	96489
Pollutant:	Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:	Population/Community Degradation
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	The site had a CSCI score(s) of 1.063229243 & 1.041761402. This score indicates that this site is supporting the aquatic life beneficial use and that the water quality objective has been met.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.
Guideline Reference:	Bioassessment in complex environments: designing an index for consistent meaning in different settings
Spatial Representation:	These samples were collected at the following station: 113PS0076
Temporal Representation:	These samples were collected on: 8/2/2012 &8/22/2012
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP Perennial Stream Surveys.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	132729
Pollutant:	Habitat Assessment (Streams)
LOE Subgroup:	Ancillary Line of Evidence
Matrix:	-N/A
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	The water body had IPI scores of 0.97, 1.04, 1.02, 0.9, 1.26, 1.26, 1.12, 1.11, 1.02 and 1.06 which indicates the habitat is likely intact (although one score indicates it could possibly be altered).
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Physical characteristics of a site vary due to both natural factors and human disturbance. Statistical models based on a large statewide reference data set can help distinguish natural variability from anthropogenic stress. These models work across the diverse stream types found in California. The Index of Physical Habitat Integrity (IPI) is a multimetric Index developed based on these models to characterize physical habitat condition for streams in California. Index scores near 1 indicate physical habitat conditions similar to reference, whereas lower scores indicate degradation. For the purposes of making statewide assessments, three thresholds (analogous to those used for the CSCI) were established based on the 30th; 10th; and 1st percentiles of IPI scores at reference sites. These three thresholds divide the IPI scoring range into 4 categories of physical condition as follows: greater than or equal to 0.94 = likely intact condition; 0.93 to 0.84 = possibly altered condition; 0.83 to 0.71 = likely altered condition; less than or equal to 0.70 = very likely altered condition. Scores of 0.83 or lower indicate that the physical habitat has been altered and low CSCI scores from this site may be due to impacts to the physical habitat.
Guideline Reference:	An Index to Measure the Quality of Physical Habitat in California Wadeable Streams
Spatial Representation:	These samples were collected at the following station: 113GAR112 113PS0076 113GAR087 113GAR015 113GAR011 113GAR178 113GAR110
Temporal Representation:	The samples were collected on: 8/22/2011 8/2/2012 8/22/2012 9/11/2012 9/9/2013 8/23/2011 8/22/2011 6/21/2011 7/23/2014 9/2/2014
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP RWB1 Monitoring.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	132785
Pollutant:	Habitat Assessment (Streams)
LOE Subgroup:	Ancillary Line of Evidence
Matrix:	-N/A
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	HABITAT ASSESSMENT
Data Used to Assess Water Quality:	The IPI scores for this water body were: 0.9 0.97 0.99 0.94 1.01 1.05 1.11 Four of these 5 scores indicate the habitat in this water body is likely intact. One score shows it is possibly altered.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Physical characteristics of a site vary due to both natural factors and human disturbance. Statistical models based on a large statewide reference data set can help distinguish natural variability from anthropogenic stress. These models work across the diverse stream types found in California. The Index of Physical Habitat Integrity (IPI) is a multimetric Index developed based on these models to characterize physical habitat condition for streams in California. Index scores near 1 indicate physical habitat conditions similar to reference, whereas lower scores indicate degradation. For the purposes of making statewide assessments, three thresholds (analogous to those used for the CSCI) were established based on the 30th; 10th; and 1st percentiles of IPI scores at reference sites. These three thresholds divide the IPI scoring range into 4 categories of physical condition as follows: greater than or equal to 0.94 = likely intact condition; 0.93 to 0.84 = possibly altered condition; 0.83 to 0.71 = likely altered condition; less than or equal to 0.70 = very likely altered condition. Scores of 0.83 or lower indicate that the physical habitat has been altered and low CSCI scores from this site may be due to impacts to the physical habitat.
Guideline Reference:	An Index to Measure the Quality of Physical Habitat in California Wadeable Streams
Spatial Representation:	These samples were collected at the following stations: 113GAR046 113GAR105 113GAR061 113GAR061 113GAR062 113GAR038 113GAR089
Temporal Representation:	These samples were collected on: 6/18/2012 6/20/2011 9/3/2014 6/19/2012 8/27/2012 9/10/2012 6/20/2011
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP RWB1 Monitoring.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109359   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater for dissolved arsenic is 150 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109378   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Qu

DECISION ID	104991	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of 5 samples from the Garcia River samples exceed the objective for AGR and MUN. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of 5 samples from the Garcia River samples exceed the objective for AGR and MUN and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 104991, Boron Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109384
Pollutant:	Boron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Agricultural Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Boron.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L).
Guideline Reference:	Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104991, Boron Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109385
Pollutant:	Boron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Boron.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L.
Guideline Reference:	Drinking Water Notification and Response Levels: An Overview
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

ality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Arsenic. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323691   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323649   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323653   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323686   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

DECISION ID	157334	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Cadmium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109435
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109425
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109429
Pollutant:	Cadmium
LOE Subgroup:	Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323648   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323687   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323685   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
M67%">Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109422
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:

  LOE ID: 323678   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for arsenic is 0.010 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323656   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157333, Arsenic	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323677   Pollutant: Arsenic LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Arsenic. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000) Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   tr> Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109423   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109434   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Mu

DECISION ID	103126	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Atrazine
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 103126, Atrazine Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109382
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Atrazine.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a \less-than\" value (for example, <1,500) and may underestimate toxicity."
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 103126, Atrazine Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109383
Pollutant:	Atrazine
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Atrazine.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for atrazine is 1 ug/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

nicipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323904   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates

DECISION ID	166995	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Azinphos-methyl (Guthion)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

Line of Evidence (LOE) for Decision ID 166995, Azinphos-methyl (Guthion) Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	102282
Pollutant:	Azinphos-methyl (Guthion)
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The National Recommended Water Quality Criteria for Azinphos Methyl (Guthion) for the protection of freshwater aquatic life is a maximum of 0.01 ug/l.
Guideline Reference:	National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Current as of 08/03/2016.
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

DECISION ID	104772	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Benthic Community Effects
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. Two line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. Six of the 32 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, there is no additional information indicating that a pollutant may be causing the impact to the benthic community. The habitat assessments scores almost all indicate that the habitat is likely intact. More information is needed to determine what is causing the impact the benthic community. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Six of the 32 benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, more information is needed to determine what is causing the impact the benthic community. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	96478
Pollutant:	Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:	Population/Community Degradation
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	30
Number of Exceedances:	6
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	The site had a CSCI score(s) of 2.187887292 1.048500329 1.016766472 0.757812836 0.886835738 0.502554686 0.949412777 0.752567063 1.0807 of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323907
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323917
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used85321 0.803908365 0.733664254 0.823465282 1.01526193 0.891054035 0.906476023 1.190224608 0.998256874 0.849414675 The samples taken on 6/20/2011, 8/22/2011, 8/23/2011, 8/27/2012, 9/10/2012, 8/5/2013, 9/9/2013, 7/22/2014, 9/2/2014, & 9/3/2014 were averaged. 6 out of 30 of these exceed the water quality objective which does not support the aquatic life beneficial use.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.
Guideline Reference:	Bioassessment in complex environments: designing an index for consistent meaning in different settings
Spatial Representation:	These samples were collected at the following station: 113GAR089 113GAR105 113GAR011 113GAR015 113GAR046 113GAR010 113GAR062 113GAR030 113GAR118 113GAR038 113GAR087 113GAR178 113GAR042 113GAR112 113GAR023 113GAR110 113GAR061
Temporal Representation:	These samples were collected on: 6/20/2011 6/21/2011 8/22/2011 8/23/2011 6/18/2012 6/19/2012 8/27/2012 8/28/2012 9/10/2012 9/11/2012 8/5/2013 8/5/2013 8/6/2013 9/9/2013 9/10/2013 7/22/2014 7/23/2014 9/2/2014 9/3/2014
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP RWB1 Monitoring.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	96489
Pollutant:	Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:	Population/Community Degradation
Matrix:	Water
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	The site had a CSCI score(s) of 1.063229243 & 1.041761402. This score indicates that this site is supporting the aquatic life beneficial use and that the water quality objective has been met.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rhen, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.
Guideline Reference:	Bioassessment in complex environments: designing an index for consistent meaning in different settings
Spatial Representation:	These samples were collected at the following station: 113PS0076
Temporal Representation:	These samples were collected on: 8/2/2012 &8/22/2012
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP Perennial Stream Surveys.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	132729
Pollutant:	Habitat Assessment (Streams)
LOE Subgroup:	Ancillary Line of Evidence
Matrix:	-N/A
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	10
Number of Exceedances:	0
Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	The water body had IPI scores of 0.97, 1.04, 1.02, 0.9, 1.26, 1.26, 1.12, 1.11, 1.02 and 1.06 which indicates the habitat is likely intact (although one score indicates it could possibly be altered).
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Physical characteristics of a site vary due to both natural factors and human disturbance. Statistical models based on a large statewide reference data set can help distinguish natural variability from anthropogenic stress. These models work across the diverse stream types found in California. The Index of Physical Habitat Integrity (IPI) is a multimetric Index developed based on these models to characterize physical habitat condition for streams in California. Index scores near 1 indicate physical habitat conditions similar to reference, whereas lower scores indicate degradation. For the purposes of making statewide assessments, three thresholds (analogous to those used for the CSCI) were established based on the 30th; 10th; and 1st percentiles of IPI scores at reference sites. These three thresholds divide the IPI scoring range into 4 categories of physical condition as follows: greater than or equal to 0.94 = likely intact condition; 0.93 to 0.84 = possibly altered condition; 0.83 to 0.71 = likely altered condition; less than or equal to 0.70 = very likely altered condition. Scores of 0.83 or lower indicate that the physical habitat has been altered and low CSCI scores from this site may be due to impacts to the physical habitat.
Guideline Reference:	An Index to Measure the Quality of Physical Habitat in California Wadeable Streams
Spatial Representation:	These samples were collected at the following station: 113GAR112 113PS0076 113GAR087 113GAR015 113GAR011 113GAR178 113GAR110
Temporal Representation:	The samples were collected on: 8/22/2011 8/2/2012 8/22/2012 9/11/2012 9/9/2013 8/23/2011 8/22/2011 6/21/2011 7/23/2014 9/2/2014
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP RWB1 Monitoring.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104772, Benthic Community Effects Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	132785
Pollutant:	Habitat Assessment (Streams)
LOE Subgroup:	Ancillary Line of Evidence
Matrix:	-N/A
Fraction:	None
Beneficial Use:	Cold Freshwater Habitat
Aquatic Life Use:	Cold Freshwater Habitat
Number of Samples:	7
Number of Exceedances:	0
Data and Information Type:	HABITAT ASSESSMENT
Data Used to Assess Water Quality:	The IPI scores for this water body were: 0.9 0.97 0.99 0.94 1.01 1.05 1.11 Four of these 5 scores indicate the habitat in this water body is likely intact. One score shows it is possibly altered.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:
Water Quality Objective/Criterion:	From the Water Quality Control Plan, North Coast Region: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Physical characteristics of a site vary due to both natural factors and human disturbance. Statistical models based on a large statewide reference data set can help distinguish natural variability from anthropogenic stress. These models work across the diverse stream types found in California. The Index of Physical Habitat Integrity (IPI) is a multimetric Index developed based on these models to characterize physical habitat condition for streams in California. Index scores near 1 indicate physical habitat conditions similar to reference, whereas lower scores indicate degradation. For the purposes of making statewide assessments, three thresholds (analogous to those used for the CSCI) were established based on the 30th; 10th; and 1st percentiles of IPI scores at reference sites. These three thresholds divide the IPI scoring range into 4 categories of physical condition as follows: greater than or equal to 0.94 = likely intact condition; 0.93 to 0.84 = possibly altered condition; 0.83 to 0.71 = likely altered condition; less than or equal to 0.70 = very likely altered condition. Scores of 0.83 or lower indicate that the physical habitat has been altered and low CSCI scores from this site may be due to impacts to the physical habitat.
Guideline Reference:	An Index to Measure the Quality of Physical Habitat in California Wadeable Streams
Spatial Representation:	These samples were collected at the following stations: 113GAR046 113GAR105 113GAR061 113GAR061 113GAR062 113GAR038 113GAR089
Temporal Representation:	These samples were collected on: 6/18/2012 6/20/2011 9/3/2014 6/19/2012 8/27/2012 9/10/2012 6/20/2011
Environmental Conditions:
QAPP Information:	Data collected following SWAMP QA protocols. QAPP for SWAMP RWB1 Monitoring.
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323885   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s):    

Pollutant:	Boron
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. Zero of 5 samples from the Garcia River samples exceed the objective for AGR and MUN. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of 5 samples from the Garcia River samples exceed the objective for AGR and MUN and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 104991, Boron Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109384
Pollutant:	Boron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Agricultural Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Boron.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Waters designated for use as agricultural supply (AGR) shall not contain concentrations of chemical constituents in amounts which adversely affect such beneficial use (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water, including irrigation of various types of crops and stock watering. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The guideline for boron is 700 ug/L (0.7 mg/L).
Guideline Reference:	Water Quality for Agriculture, Food and Agriculture Organization of the United Nations - Irrigation and Drainage Paper No. 29, Rev 1, Rome (1985)
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104991, Boron Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109385
Pollutant:	Boron
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Boron.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, North Coast Basin).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Drinking water notification levels are published by the Division of Drinking Water. Notification levels are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The notification level for Boron is 1 mg/L.
Guideline Reference:	Drinking Water Notification and Response Levels: An Overview
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

2023/ref6541.pdf" >SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323886   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323888   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 323897   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000). Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157334, C   DECISION ID 157334 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Cadmium Final Listing Decision: Do Not List on 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018) Revision Status Revised Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.   State Board Review of Regional Board Conclusion and Recommendation:   State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.   Listing Extent:     Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109435   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323899
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323910
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objea.gov/water_issues/programs/tmdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109425
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109429
Pollutant:	Cadmium
LOE Subgroup:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2013-09-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323868
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, 67%">Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109422   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:
LOE ID:	323876
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323878
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109423
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109434
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Mu.waterboards.ca.gov/water_issues/programs/tmdl/records/region_1/2018/ref4527.pdf" >Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109400
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	119666
Pollutant:	Cadmium
LOE Subgroup:
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323904
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates/td>	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109417
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323907
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323917
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109395
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109402
Pollutant:	Cadmium
LOE Subgroup:		Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2013-09-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323885
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109413
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109397
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109406
Pollutant:	Cadmium
LOE Subgroup:	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323886
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323888
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323897
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, C" valign="top" width="67%">Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 119670   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109393   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109391   Pollutant: Cadmium LOE Subgroup: Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323899
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323910
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved cadmium criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 2.2 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2013-09-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323868
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, top" width="67%">Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109411   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109386   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109389   Pollutant: Cadmium LOE Subgroup:
LOE ID:	323876
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323878
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Cadmium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109400
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	119666
Pollutant:	Cadmium
LOE Subgroup:<="67%">Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109415
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109427
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109419
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109417
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109395
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109402
Pollutant:	Cadmium
LOE Subgroup:
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109430
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109424
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109431
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109413
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109397
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109406
Pollutant:	Cadmium
LOE Subgroup:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109428
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107183
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109426
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109420
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

" valign="top" width="67%">Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 119670   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109393   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109391   Pollutant: Cadmium LOE Subgroup:    

Pollutant:	Carbophenothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 103092, Carbophenothion Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107184
Pollutant:	Carbophenothion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Carbophenothion.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The criteria for Carbophenothion (Trithion) is 0.007 mg/L.
Guideline Reference:	CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

top" width="67%">Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109411   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Ag

DECISION ID	104549	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Chlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 104549, Chlordane Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	112875
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Total Chlordanes.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104549, Chlordane Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	112872
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Total Chlordanes.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000)
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

ency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109386   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109389   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157334, Cadmium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109415   Pollutant: Cadmium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency    

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109443
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109427
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109419
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	WaterWater Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107199
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109451
Pollutant:	Chloride
LOE Subgroup:
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109430
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collecttd>	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107187
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109424
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109431
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109454
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2010-08-31 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109446
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109428
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109442
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107183
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109426
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157334, Cadmium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109420
Pollutant:	Cadmium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Cadmium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for cadmium 0.005 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

gn="left" valign="top" width="67%">The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157335, Chloride	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109450   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157335, Chloride	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109453   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Excee

DECISION ID	103092	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Carbophenothion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. None samples exceed the objectives. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 103092, Carbophenothion Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107184
Pollutant:	Carbophenothion
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Carbophenothion.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (North Coast Regional Water Quality Control Board).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	Drinking water notification levels are published by the Division of Drinking Water and are for chemicals for which there is no drinking water MCL. If a notification level is exceeded, local government notification is required and customer notification is recommended. The criteria for Carbophenothion (Trithion) is 0.007 mg/L.
Guideline Reference:	CDPH Archived Advisory Levels for Drinking Water. Archived Advisory Levels are currently considered Notification Levels.
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

dances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157335, Chloride	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 107185   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information:    

Pollutant:	Chlordane
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a single line(s) of evidence are necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the samples exceeded the objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 104549, Chlordane Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	112875
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Total Chlordanes.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The chlordane criterion for the protection of human health from the consumption of water and organisms is 0.00057 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 104549, Chlordane Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	112872
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Total Chlordanes.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Chlordane criterion continuous concentration expressed as a 4-day average for the protection of aquatic life in california waters is 0.0043 ug/L (California Toxics Rule, 2000)
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-06-12
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

width="67%">Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157335, Chloride	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109449   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157335, Chloride	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109445   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157335, Chloride	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109441   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR015) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2011-08-23 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assuran

DECISION ID	157335	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Chloride
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109443
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	107199
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109451
Pollutant:	Chloride
LOE Subgroup:
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109448
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109439
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	116505
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113PS0076)
Temporal Representation:	The samples were collected between the dates of 2012-08-02 and 2012-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 107187   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109454   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109446   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109447
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323996
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324012
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109442   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109450   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109453   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of ExceeIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324008
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	25444
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 chloride samples collected in the Garcia River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Garcia River at 2 locations as follows: (1) the Garcia River at Eureka Hill Road (SWAMP Station ID 113GAREHR), and (2) the South Fork Garcia River (SWAMP Station ID 113GARSFK). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected as grab samples during 2 site visits from each site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324071
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence dances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 107185   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109449   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109445   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324077
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324080
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9).
Temporal Representation:	The samples were collected between the dates of 2015-07-20 and 2018-08-22
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323983
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109441   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR015) Temporal Representation: The samples were collected between the dates of 2010-08-31 and 2011-08-23 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assuran>   LOE ID: 324082   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324090   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference:   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109448   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109439   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2018-07-11 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324029   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch). Temporal Representation: The samples were collected between the dates of 2015-07-21 and 2015-07-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324095   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 116505   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Perennial Stream Surveys data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chloride. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Perennial Stream Surveys .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113PS0076) Temporal Representation: The samples were collected between the dates of 2012-08-02 and 2012-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2018-08-23 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324004   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek). Temporal Representation: The samples were collected between the dates of 2014-09-03 and 2017-08-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324006   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2016-06-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324102   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2016-08-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   T: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109447
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chloride.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323996
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2018-08-21
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324012
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324008
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR030 (Garcia River at SF Garcia at Eagles Bend).
Temporal Representation:	The samples were collected between the dates of 2016-08-17 and 2016-08-17
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	25444
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	None of the 4 chloride samples collected in the Garcia River exceed the evaluation guideline. The samples were collected as part of the Surface Water Ambient Water Monitoring Program (SWAMP). The data are found in the SWAMP Summary Report for the North Coast Region for Years 2000-2006 (NCRWQCB 2008).
Data Reference:	Surface Water Ambient Monitoring Program (SWAMP). Summary Report for the North Coast Region (RWQCB-1) for years 2000-2006. North Coast Regional Water Quality Control Board. March 2008
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Per the Basin Plan (NCRWQCB 2007): Waters shall not contain taste- or odor-producing substances in concentrations that impart undesirable tastes or odors to fish flesh or other edible products of aquatic   DECISION ID 167004 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Chlorpyrifos Final Listing Decision: Do Not List on 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: New Decision Revision Status Revised Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.   State Board Review of Regional Board Conclusion and Recommendation:   State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.   Listing Extent:     Line of Evidence (LOE) for Decision ID 167004, Chlorpyrifos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109457   Pollutant: Chlorpyrifos, methyl LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Chlorpyrifos Methyl. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute). Guideline Reference: OPP Aquatic Life Benchmarks   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 167004, Chlorpyrifos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 119047   Pollutant: Chlorpyrifos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlorpyrifos. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000). Guideline Reference: Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game   Spatial Representation: Data was collected from 1 station(s) (Station Code(s) 113GA2733). Temporal Representation: Date for this waterbody was collected over the date range 2012-04-03 to 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 167004, Chlorpyrifos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109458   Pollutant: Chlorpyrifos LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Chlorpyrifos. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L. Guideline Reference: 2012 Edition of the Drinking Water Standards and Health Advisories   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   origin, or that cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) - North Coast Region (Region 1)
Evaluation Guideline:	Per 22 CCR 64449: The recommended Secondary Maximum Contaminant Level for chloride is 250 mg/L.
Guideline Reference:	Title 22. Division 4. Chapter 15. Sections 64400 et seq. California Code of Regulations
Spatial Representation:	Samples were collected from the Garcia River at 2 locations as follows: (1) the Garcia River at Eureka Hill Road (SWAMP Station ID 113GAREHR), and (2) the South Fork Garcia River (SWAMP Station ID 113GARSFK). Samples were collected from well-mixed flows in glides or riffles.
Temporal Representation:	Samples were collected as grab samples during 2 site visits from each site from May to June 2001.
Environmental Conditions:	There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data.
QAPP Information:	Quality control was conducted in accordance with the SWAMP Quality Assurance Management Plan (SWAMP 2002).
QAPP Information Reference(s):	Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324071
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR110 (South Fork Garcia River above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence   DECISION ID 167009 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Chlorpyrifos, methyl Final Listing Decision: Do Not List on 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: New Decision Revision Status Revised Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.   State Board Review of Regional Board Conclusion and Recommendation:   State Board Decision Recommendation: After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.   Listing Extent:     Line of Evidence (LOE) for Decision ID 167009, Chlorpyrifos, methyl Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109457   Pollutant: Chlorpyrifos, methyl LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 3 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Chlorpyrifos Methyl. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan). Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute). Guideline Reference: OPP Aquatic Life Benchmarks   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324077
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR046 (Garcia River at SF Garcia River).
Temporal Representation:	The samples were collected between the dates of 2014-09-02 and 2018-07-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324080
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR244 (North Fork Garcia above Bridge 9).
Temporal Representation:	The samples were collected between the dates of 2015-07-20 and 2018-08-22
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	323983
Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR089 (Mill Creek above Redwood Creek).
Temporal Representation:	The samples were collected between the dates of 2015-06-30 and 2015-06-30
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   DECISION ID 157348 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Chromium Final Listing Decision: Do Not List on 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018) Revision Status Revised Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.   State Board Review of Regional Board Conclusion and Recommendation:   State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.   Listing Extent:     Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324188   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324185   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324194   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water   LOE ID: 324082   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR105 (Garcia River below Mill Creek). Temporal Representation: The samples were collected between the dates of 2015-06-30 and 2015-06-30 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324090   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2018-07-11 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324029   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR084 (Garcia River above Olsen Gulch). Temporal Representation: The samples were collected between the dates of 2015-07-21 and 2015-07-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324095   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324202   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2013-09-09 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324217   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324233   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolvft" valign="top" width="33%">Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road). Temporal Representation: The samples were collected between the dates of 2013-09-09 and 2018-08-23 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324004   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR061 (Garcia River downstream of Rolling Brook Creek). Temporal Representation: The samples were collected between the dates of 2014-09-03 and 2017-08-02 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324006   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2016-06-21 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157335, Chloride Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324102   Pollutant: Chloride LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Chloride. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-B for chloride is 250 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2016-08-16 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   ed
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324258
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324179
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324193
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:
DECISION ID	167004	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Chlorpyrifos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

Line of Evidence (LOE) for Decision ID 167004, Chlorpyrifos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109457
Pollutant:	Chlorpyrifos, methyl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Chlorpyrifos Methyl.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 167004, Chlorpyrifos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	119047
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Chlorpyrifos. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The freshwater criterion continuous concentration to protect aquatic organisms is 0.014 ug/L (Siepmann and Finlayson 2000).
Guideline Reference:	Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 167004, Chlorpyrifos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109458
Pollutant:	Chlorpyrifos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Chlorpyrifos.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The USEPA drinking water health advisory for chlorpyrifos is 2 µg/L.
Guideline Reference:	2012 Edition of the Drinking Water Standards and Health Advisories
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

DECISION ID	167009	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Chlorpyrifos, methyl
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

Line of Evidence (LOE) for Decision ID 167009, Chlorpyrifos, methyl Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109457
Pollutant:	Chlorpyrifos, methyl
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	3
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality standard for Chlorpyrifos Methyl.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for Chlorpyrifos Methyl is the USEPA Aquatic Life Benchmark of 0.085 ug/L for an invertebrate (acute).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

d align="left" valign="top" width="67%">Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157348, Chromium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 324232   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157348, Chromium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 324238   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP  

Line of Evidence (LOE) for Decision ID 157348, Chromium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 324247   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality:    

Pollutant:	Chromium
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP programQuality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324188
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:		Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109460
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324185
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324194
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109472
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109473
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follow>
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324202
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109461
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324217
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2013-09-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324233
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolvard/2017/ref4461.zip" >Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109474
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109471
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as followsed
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324258
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Re: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109470
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324179
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations for dissolved chromium to protect aquatic life in freshwater. The dissolved Chromium criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324193
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109459
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	4
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-06-12 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109479
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109483
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324232   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River). Temporal Representation: The samples were collected between the dates of 2013-08-05 and 2013-08-05 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324238   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek). Temporal Representation: The samples were collected between the dates of 2013-09-10 and 2013-09-10 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 324247   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103763
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109485
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109464
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348,d> Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Chromium. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek). Temporal Representation: The samples were collected between the dates of 2013-08-06 and 2013-08-06 Environmental Conditions: QAPP Information: QAPP for Surface Water Ambient Monitoring Program (SWAMP) QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109460   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109472   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109473   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follow Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109467
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109463
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109469
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, s: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR118) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109461   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109468
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109465
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109474
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109471
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as followsop" width="67%">SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109462
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, C: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109470   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103762
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103764
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109484
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109459   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 4 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-06-12 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109479   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109483   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109475   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109478   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103760   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR110) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109481   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103763
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109485
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109464
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348,>Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109482   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109476   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 109480   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103759   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR105) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Chromium		Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109467   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR062) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157348, Chromium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109463   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157348, Chromium	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 109469   Pollutant: Chromium LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157348,   DECISION ID 157336 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   Pollutant: Copper Final Listing Decision: Do Not List on 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2018) Revision Status Revised Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.   Regional Board Decision Recommendation: After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.   State Board Review of Regional Board Conclusion and Recommendation:   State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.   Listing Extent:     Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103785   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109468
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109465
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324324
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103796
Pollutant:	CopperSWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109462
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Ctd> LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR178) Temporal Representation: The samples were collected between the dates of 2011-06-21 and 2011-06-21 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103782   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Ruleshromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103762
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103764
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Crite and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103791
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103769
Pollutant:	Copper
	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109484
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 2 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR011) Temporal Representation: The samples were collected between the dates of 2010-09-01 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103767   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. F-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109475
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109478
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05ederal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103601
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103787
Pollutant:	Copper
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103760
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109481
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103780
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol>Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109482
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103789
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103778
Pollutant:	Copper
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109476
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109480
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157348, Chromium Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103759
Pollutant:	Chromium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Chromium.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The maximum contaminant level listed in Table 64431-A for chromium 0.05 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR061) Temporal Representation: The samples were collected between the dates of 2012-06-19 and 2012-06-19 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157336, Copper	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103765   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157336, Copper	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103774   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157336, Copper	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103776   Pollutant: Copper LOE Subgroup:

DECISION ID	157336	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Copper
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:

oards.ca.gov/water_issues/programs/tmdl/records/region_1/2017/ref4452.zip">Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring . " width="67%">Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.

Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103785
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324324
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103796
Pollutant:	CopperPollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103799
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103798
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103807
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103782
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103791
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103769
Pollutant:	Copper
Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR087)
Temporal Representation:	The samples were collected between the dates of 2012-09-11 and 2012-09-11
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103801
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103802
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103804
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103767
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR010)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103601
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR030)
Temporal Representation:	The samples were collected between the dates of 2012-08-28 and 2012-08-28
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103787
Pollutant:	Copper
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103812
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103813
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103803
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103780
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103789
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103778
Pollutant:	Copper
" width="67%">Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103800
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance ProLOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103765
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	5
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washiject Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103810
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103811
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GA2733)
Temporal Representation:	The samples were collected between the dates of 2012-04-03 and 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103774
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR038)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103776
Pollutant:	Copper
LOE Subgroup:
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR112)
Temporal Representation:	The samples were collected between the dates of 2011-08-22 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103808
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR089)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion. Objective/Criterion Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR046) Temporal Representation: The samples were collected between the dates of 2012-06-18 and 2012-06-18 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103799   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR010) Temporal Representation: The samples were collected between the dates of 2012-08-27 and 2012-08-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103798   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 5 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GA2733) Temporal Representation: The samples were collected between the dates of 2012-04-03 and 2012-11-27 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103807   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103806
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR062)
Temporal Representation:	The samples were collected between the dates of 2012-08-27 and 2012-08-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103809
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR105)
Temporal Representation:	The samples were collected between the dates of 2011-06-20 and 2011-06-20
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103793
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	California Toxics Rule (CTR) lists criterion continuous concentrations to protect aquatic life in freshwater. The criterion in freshwater is hardness dependent for each sample and varies based on the ambient hardness during sampling. Section (b)(1) in CTR contains the hardness dependent formula for the metals criterion.
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR087) Temporal Representation: The samples were collected between the dates of 2012-09-11 and 2012-09-11 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103801   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR030) Temporal Representation: The samples were collected between the dates of 2012-08-28 and 2012-08-28 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103802   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR038) Temporal Representation: The samples were collected between the dates of 2012-09-10 and 2012-09-10 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program   Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River   LOE ID: 103804   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324354
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324357
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324284
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR087 (Garcia River above Inman Creek).
Temporal Representation:	The samples were collected between the dates of 2013-08-06 and 2013-08-06
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	32 width="33%">Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR061)
Temporal Representation:	The samples were collected between the dates of 2012-06-19 and 2012-06-19
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103812
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR118)
Temporal Representation:	The samples were collected between the dates of 2012-09-10 and 2012-09-10
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103813
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR178)
Temporal Representation:	The samples were collected between the dates of 2011-06-21 and 2011-06-21
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103803
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324333
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR112 (Blue Waterhole Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324328
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR178 (Signal Creek at Big Cheese Road).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324327
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR046)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103800
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	2
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR011)
Temporal Representation:	The samples were collected between the dates of 2010-09-01 and 2011-08-22
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Pro
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR015 (Garcia River above Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-09 and 2013-09-09
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324317
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	Tject Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103810
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site(s) (113GAR110)
Temporal Representation:	The samples were collected between the dates of 2012-06-18 and 2012-06-18
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	103811
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper.
Data Reference:	Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324295
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Municipal & Domestic Supply
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L.
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2013-09-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324309
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR042 (Garcia River below Signal Creek).
Temporal Representation:	The samples were collected between the dates of 2013-09-10 and 2013-09-10
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 157336, Copper Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	324318
Pollutant:	Copper
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Copper.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 1
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Objective/Criterion Reference:	Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	The samples were collected at 1 monitoring site: 113GAR023 (Inman Creek above Garcia River).
Temporal Representation:	The samples were collected between the dates of 2013-08-05 and 2013-08-05
Environmental Conditions:
QAPP Information:	QAPP for Surface Water Ambient Monitoring Program (SWAMP)
QAPP Information Reference(s):	SWAMP QAPrP

oards.ca.gov/water_issues/programs/tmdl/records/region_1/2017/ref4452.zip">Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR112) Temporal Representation: The samples were collected between the dates of 2011-08-22 and 2011-08-22 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

Line of Evidence (LOE) for Decision ID 157336, Copper	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

  LOE ID: 103808   Pollutant: Copper LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Municipal & Domestic Supply   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Copper. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .   SWAMP Data: SWAMP   Water Quality Objective/Criterion: Water Quality Control Plan, North Coast Region (NCRWQCB 2018): Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of chemical constituents in excess of the limits specified in California Code of Regulations, Title 22, Chapter 15. The secondary maximum contaminant level listed in Table 64449-A copper is 1.0 mg/L. Objective/Criterion Reference: Water Quality Control Plan (Basin Plan) for the North Coast Region   Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site(s) (113GAR089) Temporal Representation: The samples were collected between the dates of 2011-06-20 and 2011-06-20 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program QAPP Information Reference(s): Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program  

DECISION ID	167010	Region 1
Mendocino Coast HU, Garcia River HA, Garcia River

Pollutant:	Coumaphos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:

Line of Evidence (LOE) for Decision ID 167010, Coumaphos Region 1      Mendocino Coast HU, Garcia River HA, Garcia River
LOE ID:	109141
Pollutant:	Coumaphos
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB1 Monitoring data for Mendocino Coast HU, Garcia River HA, Garcia River to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Coumaphos. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Data Reference:	Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP RWB1 Monitoring .
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. (Basin Plan).
Objective/Criterion Reference:	Water Quality Control Plan (Basin Plan) for the North Coast Region
Evaluation Guideline:	The evaluation guideline for Coumaphos is the USEPA Aquatic Life Benchmark of 0.0337 ug/L for an invertebrate (chronic).
Guideline Reference:	OPP Aquatic Life Benchmarks
Spatial Representation:	Data was collected from 1 station(s) (Station Code(s) 113GA2733).
Temporal Representation:	Date for this waterbody was collected over the date range 2012-04-03 to 2012-11-27
Environmental Conditions:
QAPP Information:	Quality Assurance Program Plan and Standard Operating Procedures for SWAMP program
QAPP Information Reference(s):	Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program

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