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

Supporting Information

Regional Board 6 - Lahontan Region

Water Body Name:	Crowley Lake
Water Body ID:	CAL6031009019980806103521
Water Body Type:	Lake & Reservoir

DECISION ID	170270	Region 6
Crowley Lake

Pollutant:	Mercury
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2018)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Medium
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under sections 4.3, 4.5 and 4.11 of the Listing Policy. Under section 4.5 a single line of evidence is necessary to assess listing status. Under section 4.11 when all other delisting factors do not result in the delisting of a water segment but information indicates attainment of standards, a water segment shall be evaluated to determine whether the weight of evidence demonstrates that water quality standard is attained. If the weight of evidence indicates attainment, the water segment shall be removed from the CWA section 303(d) List. Twenty-four lines of evidence are available in the administrative record to assess the pollutant. Water and Sediment LOEs: Seven water and sediment LOEs are available to assess COLD beneficial use. Data and information are insufficient. Four water LOEs are available to assess MUN beneficial use. Data and information are insufficient. Four water LOEs are available to assess COMM beneficial use. Data and information are insufficient to assess water. Tissue LOEs: COMM (Sport fish objective) LOE 132843: 0 of 1 samples exceed the mercury objective and consist of 10 trophic level 3 fish. LOE 133338: 1 of 1 samples exceed the mercury objective and consist of 2 trophic level 3 fish. (CDFW legal limits) LOE 337358: 1 of 1 samples exceed the mercury objective and consist of 12 trophic level 3 fish. (CDFW legal limits) LOE 351595: OEHHA has issued a health advisory for eating fish tissue from Crowley Lake due to levels mercury in fish tissue. WILD (Prey fish objective) LOE 133170: 0 of 1 samples exceed the mercury objective and consist of 10 50-150mm prey fish. LOE 337349: 1 of 1 samples exceed the mercury objective and consist of 7 50-150mm prey fish. WILD (Sport fish objective) LOE 132834: 1 of 1 samples exceed the mercury objective and consist of 8 trophic level 3 fish. LOE 132862: 0 of 1 samples exceed the mercury objective and consist of 10 trophic level 3 fish. LOE 337352: 1 of 1 samples exceed the mercury objective and consist of 18 trophic level 3 fish. LOE 337353: 1 of 1 samples exceed the mercury objective and consist of 12 trophic level 3 fish. (CDFW legal limits) In 2024, OEHHA issued a Fish Advisory for Crowley Lake for mercury. The health advisory includes Lahontan Cutthroat Trout, Rainbow Trout or Sacramento Perch of which Rainbow Trout samples are present in LOEs 133338 and 337358. For the WILD beneficial use assessments: LOEs 132834, 132862, and 337352 assess trophic level 3 fish which were collected in accordance with the fish length requirements of the water quality objective. These LOEs assess the available data using the Sport Fish WQO (0.02 mg/Kg ww). The Sport Fish WQO protects the COMM beneficial use, and if this WQO is exceeded then the Prey Fish WQO (written for the protection of WILD) can also be determined to be impaired. LOEs 132834 and 337352 contain data that exceed the Sport Fish WQO, LOE 132862 contains data that do not exceed the Sport Fish WQO. Because the goal of this assessment is to determine impairment of the WILD beneficial use, LOEs 132834, 337352, & 132862 cannot be assessed together - LOE 132834 and 337352 contain data that have been shown to exceed the Sport Fish WQO (and therefore the Prey Fish WQO), while LOE 132862 contains data that do not exceed the Sport Fish WQO but it is not possible to determine if the Prey Fish WQO is exceeded. Therefore 2 of 2 samples from LOE 132834 and 337352 exceed the applicable water quality objective for the protection of WILD, and this is sufficient evidence to support the listing of Crowley Lake for the impairment of the WILD beneficial use. Additional information in support of this decision includes a 2015 USGS report titled 'Estimating Exposure of Piscivorous Birds and Sport Fish to Mercury in California Lakes Using Prey Fish Monitoring: A Predictive Tool for Managers'. The report cited several lakes in the Lahontan Region as likely adversely impacting mercury concentrations in populations of grebes living in their vicinity. Crowley Lake was one of those lakes. The Regional Board has included the conclusions from the USGS report by reference as a secondary line of evidence which supports the dec   DECISION ID 170270 Region 6      Crowley Lake   Pollutant: Mercury Final Listing Decision: Do Not Delist from 303(d) list (TMDL required list) Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2018) Revision Status Revised Sources: A Source Unknown TMDL Priority: Medium Impairment from Pollutant or Pollution: Pollutant   Regional Board Conclusion: This pollutant is being considered for removal from the CWA section 303(d) List under sections 4.3, 4.5 and 4.11 of the Listing Policy. Under section 4.5 a single line of evidence is necessary to assess listing status. Under section 4.11 when all other delisting factors do not result in the delisting of a water segment but information indicates attainment of standards, a water segment shall be evaluated to determine whether the weight of evidence demonstrates that water quality standard is attained. If the weight of evidence indicates attainment, the water segment shall be removed from the CWA section 303(d) List. Twenty-four lines of evidence are available in the administrative record to assess the pollutant. Water and Sediment LOEs: Seven water and sediment LOEs are available to assess COLD beneficial use. Data and information are insufficient. Four water LOEs are available to assess MUN beneficial use. Data and information are insufficient. Four water LOEs are available to assess COMM beneficial use. Data and information are insufficient to assess water. Tissue LOEs: COMM (Sport fish objective) LOE 132843: 0 of 1 samples exceed the mercury objective and consist of 10 trophic level 3 fish. LOE 133338: 1 of 1 samples exceed the mercury objective and consist of 2 trophic level 3 fish. (CDFW legal limits) LOE 337358: 1 of 1 samples exceed the mercury objective and consist of 12 trophic level 3 fish. (CDFW legal limits) LOE 351595: OEHHA has issued a health advisory for eating fish tissue from Crowley Lake due to levels mercury in fish tissue. WILD (Prey fish objective) LOE 133170: 0 of 1 samples exceed the mercury objective and consist of 10 50-150mm prey fish. LOE 337349: 1 of 1 samples exceed the mercury objective and consist of 7 50-150mm prey fish. WILD (Sport fish objective) LOE 132834: 1 of 1 samples exceed the mercury objective and consist of 8 trophic level 3 fish. LOE 132862: 0 of 1 samples exceed the mercury objective and consist of 10 trophic level 3 fish. LOE 337352: 1 of 1 samples exceed the mercury objective and consist of 18 trophic level 3 fish. LOE 337353: 1 of 1 samples exceed the mercury objective and consist of 12 trophic level 3 fish. (CDFW legal limits) In 2024, OEHHA issued a Fish Advisory for Crowley Lake for mercury. The health advisory includes Lahontan Cutthroat Trout, Rainbow Trout or Sacramento Perch of which Rainbow Trout samples are present in LOEs 133338 and 337358. For the WILD beneficial use assessments: LOEs 132834, 132862, and 337352 assess trophic level 3 fish which were collected in accordance with the fish length requirements of the water quality objective. These LOEs assess the available data using the Sport Fish WQO (0.02 mg/Kg ww). The Sport Fish WQO protects the COMM beneficial use, and if this WQO is exceeded then the Prey Fish WQO (written for the protection of WILD) can also be determined to be impaired. LOEs 132834 and 337352 contain data that exceed the Sport Fish WQO, LOE 132862 contains data that do not exceed the Sport Fish WQO. Because the goal of this assessment is to determine impairment of the WILD beneficial use, LOEs 132834, 337352, & 132862 cannot be assessed together - LOE 132834 and 337352 contain data that have been shown to exceed the Sport Fish WQO (and therefore the Prey Fish WQO), while LOE 132862 contains data that do not exceed the Sport Fish WQO but it is not possible to determine if the Prey Fish WQO is exceeded. Therefore 2 of 2 samples from LOE 132834 and 337352 exceed the applicable water quality objective for the protection of WILD, and this is sufficient evidence to support the listing of Crowley Lake for the impairment of the WILD beneficial use. Additional information in support of this decision includes a 2015 USGS report titled 'Estimating Exposure of Piscivorous Birds and Sport Fish to Mercury in California Lakes Using Prey Fish Monitoring: A Predictive Tool for Managers'. The report cited several lakes in the Lahontan Region as likely adversely impacting mercury concentrations in populations of grebes living in their vicinity. Crowley Lake was one of those lakes. The Regional Board has included the conclusions from the USGS report by reference as a secondary line of evidence which supports the decision to list the waterbody for mercury impairment. The reference for this supporting data is ref4604 and can be found in the CalWQA database. The Regional Board listing decision for this waterbody is DO NOT DELIST. This decision is based on a combination of data assessed under section 4.1 of the Listing Policy, and other information considered under section 4.11 of the Listing Policy. Information contained in LOE 132834 and 337352 indicate that trophic level three fish are impaired for mercury from two composite fish tissue samples containing eight and eighteen individual fish, respectively. Information contained in LOEs 133338 and 337358 indicate that there is other fish tissue data which exceeds the Sport Fish WQO. There are two mercury 303(d) listed tributaries to Crowley Lake. There are impacts to local grebe populations at Crowley Lake have also been identified by the referenced USGS report. 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 satisision to list the waterbody for mercury impairment. The reference for this supporting data is ref4604 and can be found in the CalWQA database. The Regional Board listing decision for this waterbody is DO NOT DELIST. This decision is based on a combination of data assessed under section 4.1 of the Listing Policy, and other information considered under section 4.11 of the Listing Policy. Information contained in LOE 132834 and 337352 indicate that trophic level three fish are impaired for mercury from two composite fish tissue samples containing eight and eighteen individual fish, respectively. Information contained in LOEs 133338 and 337358 indicate that there is other fish tissue data which exceeds the Sport Fish WQO. There are two mercury 303(d) listed tributaries to Crowley Lake. There are impacts to local grebe populations at Crowley Lake have also been identified by the referenced USGS report. 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 satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the WILD beneficial use (LOE 132834 and 337352). These data satisfy the requirements of Section 4.1 of the Listing Policy. 4. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the COMM beneficial use (LOE 133338 and 337358). These data satisfy the requirements of Section 4.1 of the Listing Policy. 5. A 2015 USGS report that states that local populations of grebes are very likely impacted by mercury contamination of fish from Crowley Reservoir. 6. An OEHHA issued fish advisory for Crowley Lake for mercury, and available information indicates that the mercury tissue objective is exceeded. 7. Two tributary waterbodies to Crowley Lake, Hot Creek and Mammoth Creek, have been determined as impaired by mercury because of concentrations of the pollutant recovered from fish tissue and the water column. 8. Considering the data and information contained in points 4, 5, 6, and 7 above, staff have applied section 4.11 of the Listing Policy (Weight of Evidence) to support the leaving Crowley Lake on the 303(d) List as impaired for mercury.   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: Additional information in support of this decision includes a 2015 USGS report titled 'Estimating Exposure of Piscivorous Birds and Sport Fish to Mercury in California Lakes Using Prey Fish Monitoring: A Predictive Tool for Managers'. The report cited several lakes in the Lahontan Region as likely adversely impacting mercury concentrations in populations of grebes living in their vicinity. Crowley Lake was one of those lakes. The Regional Board has included the conclusions from the USGS report by reference as a secondary line of evidence which supports the decision to list the waterbody for mercury impairment. The reference for this supporting data is ref4604 and can be found in the CalWQA database. The Regional Board listing decision for this waterbody is DO NOT DELIST. This decision is based on a combination of data assessed under section 4.1 of the Listing Policy, and other information considered under section 4.11 of the Listing Policy. Information contained in LOE 132834 and 337352 indicate that trophic level three fish are impaired for mercury from two composite fish tissue samples containing eight and eighteen individual fish, respectively. Information contained in LOEs 133338 and 337358 indicate that there is other fish tissue data which exceeds the Sport Fish WQO. There are two mercury 303(d) listed tributaries to Crowley Lake. There are impacts to local grebe populations at Crowley Lake have also been identified by the referenced USGS report. 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 satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the WILD beneficial use (LOE 132834 and 337352). These data satisfy the requirements of Section 4.1 of the Listing Policy. 4. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the COMM beneficial use (LOE 133338 and 337358). These data satisfy the requirements of Section 4.1 of the Listing Policy. 5. A 2015 USGS report that states that local populations of grebes are very likely impacted by mercury contamination of fish from Crowley Reservoir. 6. An OEHHA issued fish advisory for Crowley Lake for mercury, and available information indicates that the mercury tissue objective is exceeded. 7. Two tributary waterbodies to Crowley Lake, Hot Creek and Mammoth Creek, have been determined as impaired by mercury because of concentrations of the pollutant recovered from fish tissue and the water column. 8. Considering the data and information contained in points 4, 5, 6, and 7 above, staff have applied section 4.11 of the Listing Policy (Weight of Evidence) to support the leaving Crowley Lake on the 303(d) List as impaired for mercury.   State Board Decision Recommendation: Decision written by SWRCB staff.   Listing Extent:     Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338749   Pollutant: Mercury LOE fy the data quantity requirements of section 6.1.5 of the Policy. 3. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the WILD beneficial use (LOE 132834 and 337352). These data satisfy the requirements of Section 4.1 of the Listing Policy. 4. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the COMM beneficial use (LOE 133338 and 337358). These data satisfy the requirements of Section 4.1 of the Listing Policy. 5. A 2015 USGS report that states that local populations of grebes are very likely impacted by mercury contamination of fish from Crowley Reservoir. 6. An OEHHA issued fish advisory for Crowley Lake for mercury, and available information indicates that the mercury tissue objective is exceeded. 7. Two tributary waterbodies to Crowley Lake, Hot Creek and Mammoth Creek, have been determined as impaired by mercury because of concentrations of the pollutant recovered from fish tissue and the water column. 8. Considering the data and information contained in points 4, 5, 6, and 7 above, staff have applied section 4.11 of the Listing Policy (Weight of Evidence) to support the leaving Crowley Lake on the 303(d) List as impaired for mercury.   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: Additional information in support of this decision includes a 2015 USGS report titled 'Estimating Exposure of Piscivorous Birds and Sport Fish to Mercury in California Lakes Using Prey Fish Monitoring: A Predictive Tool for Managers'. The report cited several lakes in the Lahontan Region as likely adversely impacting mercury concentrations in populations of grebes living in their vicinity. Crowley Lake was one of those lakes. The Regional Board has included the conclusions from the USGS report by reference as a secondary line of evidence which supports the decision to list the waterbody for mercury impairment. The reference for this supporting data is ref4604 and can be found in the CalWQA database. The Regional Board listing decision for this waterbody is DO NOT DELIST. This decision is based on a combination of data assessed under section 4.1 of the Listing Policy, and other information considered under section 4.11 of the Listing Policy. Information contained in LOE 132834 and 337352 indicate that trophic level three fish are impaired for mercury from two composite fish tissue samples containing eight and eighteen individual fish, respectively. Information contained in LOEs 133338 and 337358 indicate that there is other fish tissue data which exceeds the Sport Fish WQO. There are two mercury 303(d) listed tributaries to Crowley Lake. There are impacts to local grebe populations at Crowley Lake have also been identified by the referenced USGS report. 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 satisfy the data quantity requirements of section 6.1.5 of the Policy. 3. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the WILD beneficial use (LOE 132834 and 337352). These data satisfy the requirements of Section 4.1 of the Listing Policy. 4. 2 of 2 composite tissue samples comprising of 8 or more individual fish exceeded the water quality objectives for the COMM beneficial use (LOE 133338 and 337358). These data satisfy the requirements of Section 4.1 of the Listing Policy. 5. A 2015 USGS report that states that local populations of grebes are very likely impacted by mercury contamination of fish from Crowley Reservoir. 6. An OEHHA issued fish advisory for Crowley Lake for mercury, and available information indicates that the mercury tissue objective is exceeded. 7. Two tributary waterbodies to Crowley Lake, Hot Creek and Mammoth Creek, have been determined as impaired by mercury because of concentrations of the pollutant recovered from fish tissue and the water column. 8. Considering the data and information contained in points 4, 5, 6, and 7 above, staff have applied section 4.11 of the Listing Policy (Weight of Evidence) to support the leaving Crowley Lake on the 303(d) List as impaired for mercury.   State Board Decision Recommendation: Decision written by SWRCB staff.   Listing Extent:     Mercury. l Board Resolution No. 2017-0027. Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338749   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338748   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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 Guid valign="top" width="33%">Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338748   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338739   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338752   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total Region 6      Crowley Lake   LOE ID: 338739   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338752   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report intr>   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 351595   Pollutant: Mercury LOE Subgroup: Health Advisories Matrix: -N/A Fraction: None   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: Occurrence of conditions judged to cause impairment Data Used to Assess Water Quality: The Office of Environmental Health Hazard Assessment (OEHHA) has issued a health advisory and guidelines in 2020 for eating fish from Crowley Lake due to levels of mercury in fish tissue. A summary of the advisory and the background information (including associated sample results) and a description of how the guidelines were developed is available at https://www.waterboards.ca.gov/lahontan/water_issues/programs/swamp/fish_tissue.html Data Reference: Health Advisory and Guidelines for Eating Fish from Crowley Lake (Mono County)   SWAMP Data: Non-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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: Guideline Reference:   Spatial Representation: Temporal Representation: Environmental Conditions:   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 351595   Pollutant: Mercury LOE Subgroup: Health Advisories Matrix: -N/A Fraction: None   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 0 Number of Exceedances: 0   Data and Information Type: Occurrence of conditions judged to cause impairment Data Used to Assess Water Quality: The Office of Environmental Health Hazard Assessment (OEHHA) has issued a health advisory and guidelines in 2020 for eating fish from Crowley Lake due to levels of mercury in fish tissue. A summary of the advisory and the background information (including associated sample results) and a description of how the guidelines were developed is available at https://www.waterboards.ca.gov/lahontan/water_issues/programs/swamp/fish_tissue.html Data Reference: Health Advisory and Guidelines for Eating Fish from Crowley Lake (Mono County)   SWAMP Data: Non-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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: Guideline Reference:   Spatial Representation: Temporal Representation: Environmental Conditions: QAPP Information: The advisory was prepared by OEHHA utilizing OEHHA protocols. QAPP Information Reference(s): Health Advisory and Guidelines for Eating Fish from Crowley Lake (Mono County)   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      QAPP Information: The advisory was prepared by OEHHA utilizing OEHHA protocols. QAPP Information Reference(s): Health Advisory and Guidelines for Eating Fish from Crowley Lake (Mono County)   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338741   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338747   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold forgn: left; PADDING-TOP: 3px; font-smooth: always">Crowley Lake   LOE ID: 338741   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Total   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338747   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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 Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338740   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Evaluation Guideline: Guideline Reference:   Spatial Representation: The samples were collected at 1 monitoring site: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338740   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338746   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Cold Freshwater Habitat   Number of Samples: Region 6      Crowley Lake   LOE ID: 338746   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337178   Pollutant: Mercury LOE Subgroup: Pollutant-Sediment Matrix: Sediment 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury . Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: All waters shall be maintained free of tp" width="67%">1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337178   Pollutant: Mercury LOE Subgroup: Pollutant-Sediment Matrix: Sediment 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury . Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603LCD001 (Lake Crowley above Dam). Temporal Representation: Data for this waterbody were collected over the date range 2021-07-27 to 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338750   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337358   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 1   Data and Information Type: PHYSoxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603LCD001 (Lake Crowley above Dam). Temporal Representation: Data for this waterbody were collected over the date range 2021-07-27 to 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338750   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The mercury criteria for the protection of human health from the consumption of water and organisms is 0.050 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: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 4 composites of Lahontan Cutthroat Trout composed of 1 fish each, 6 composites of Rainbow Trout composed of 1 fish each, and 1 composite of Sacramento Perch composed of 2 fish. This LOE contains data only for trophic level 3 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 12 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-27. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337349   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 2 composites: 1 composite of Sacramento Perch composed of 3 fish and 1 composite of Sacramento Perch composed of 4 fish. All fish collected between February and July of the same calendar year with a reported length of 50-150 mm were averaged into a single sample, independent of species or trophic level, for comparison with the objective. All 7 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWA="2">  LOE ID: 337358   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 4 composites of Lahontan Cutthroat Trout composed of 1 fish each, 6 composites of Rainbow Trout composed of 1 fish each, and 1 composite of Sacramento Perch composed of 2 fish. This LOE contains data only for trophic level 3 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 12 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-27. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337349   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   Number of Samples: 1 Number of Exceedances: 1   Data and Information Type: PHYSICAL/CHEMICAL MONITORING   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Prey Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.05 mg/Kg wet weight whole fish samples of any fish species between 50 to 150 mm in total length collected between February 1 and July 31. (SWRCB Resolution No. 2017-0027) Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-26. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337353   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 4 composites of Lahontan Cutthroat Trout composed of 1 fish each, 6 composites of Rainbow Trout composed of 1 fish each, and 1 composite of Sacramento Perch composed of 2 fish. This LOE contains data only for trophic level 3 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 12 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Controalign="left" valign="top" width="33%">Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 2 composites: 1 composite of Sacramento Perch composed of 3 fish and 1 composite of Sacramento Perch composed of 4 fish. All fish collected between February and July of the same calendar year with a reported length of 50-150 mm were averaged into a single sample, independent of species or trophic level, for comparison with the objective. All 7 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Prey Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.05 mg/Kg wet weight whole fish samples of any fish species between 50 to 150 mm in total length collected between February 1 and July 31. (SWRCB Resolution No. 2017-0027) Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-26. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337353   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 4 composites of Lahontan Cutthroat Trout composed of 1 fish each, 6 composites of Rainbow Trout composed of 1 fish each, and 1 composite of Sacramento Perch composed of 2 fish. This LOE contains data only for trophic level 3 fish whose average length was inside the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 12 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-27. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337352   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 9 composites of Lahontan Cutthroat Trout composed of 1 fish each, 7 composites of Rainbow Trout composed of 1 fish each, and 1 composite of Sacramento Perch composed of 2 fish. This LOE contains data only for trophic level 3 fish. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 18 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-27. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337352   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of 1 sample exceeded the water quality threshold for Mercury. Monitors collected 3 composites: 9 composites of Lahontan Cutthroat Trout composed of 1 fish each, 7 composites of Rainbow Trout composed of 1 fish each, and 1 composite of Sacramento Perch composed of 2 fish. This LOE contains data only for trophic level 3 fish. Fish collected within the same calendar year were averaged into a single sample for comparison with the objective. All 18 fish were collected in a single calendar year, which resulted in 1 independent sample. The exceeding sample was for 2021. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-27. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 132843   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 10 fish were aggregated into 1 annual averages, which consisted of 1 fish species (2 composite(s) of Rainbow Trout each composed of 5 fish per composite). Data Reference: Statewide Lakes Sportfish Contamination Study 2007 2008   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 2007-07-26 and 2007-07-26 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP L:akes and Reserviors study QAPP Information Reference(s): Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 133338   Pollutant: Mercury Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603PCW027 (Lake Crowley). Temporal Representation: Data for this line of evidence were collected between 2021-07-26 and 2021-07-27. When composited fish were collected over multiple days, the first day of fish collection was used as the sample date in the LOE, both for LOE writing, and for averaging period purposes. Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 132843   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP Sportfish Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 10 fish were aggregated into 1 annual averages, which consisted of 1 fish species (2 composite(s) of Rainbow Trout each composed of 5 fish per composite). Data Reference: Statewide Lakes Sportfish Contamination Study 2007 2008   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 2007-07-26 and 2007-07-26 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP L:akes and Reserviors study QAPP Information Reference(s): Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Preparedp" width="33%">LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   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 Wildlife Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 2 fish were aggregated into 1 annual averages, which consisted of 1 fish species (2 composite(s) of Rainbow Trout each composed of 1 fish per composite). Of these annual averages, 1 average(s), (Year(s): 2012) exceeded the objective. This LOE does not contain data from fish whos average length was outside of the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Wildlife Contamination in Lakes and Reservoirs.   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 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 170270, Mercury Region 6      Crowley Lake   LOE ID: 133170   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife 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 Wildlife Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 for SWAMP BOG, 49 pages plus appendices and attachments   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 133338   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   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 Wildlife Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 2 fish were aggregated into 1 annual averages, which consisted of 1 fish species (2 composite(s) of Rainbow Trout each composed of 1 fish per composite). Of these annual averages, 1 average(s), (Year(s): 2012) exceeded the objective. This LOE does not contain data from fish whos average length was outside of the legal size limits as described by the California Department of Fish and Wildlife Fishing Regulations. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Wildlife Contamination in Lakes and Reservoirs.   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of the Commercial and Sport Fishing beneficial comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 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 170270, Mercury Region 6      Crowley Lake   LOE ID: 133170   Pollutant: Mercury Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Wildlife Contamination in Lakes and Reservoirs.   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Prey Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.05 mg/Kg wet weight whole fish samples of any fish species between 50 to 150 mm in total length collected between February 1 and July 31. (SWRCB Resolution No. 2017-0027) Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 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 170270, Mercury Region 6      Crowley Lake   LOE ID: 132862   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife 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 Sportfish Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 10 fish were aggregated into 1 annual averages, which consisted of 1 fish species (2 composite(s) of Rainbow Trout each composed of 5 fish per composite). Data Reference: Statewide Lakes Sportfish Contamination Study 2007 2008   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitattr> LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife 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 Wildlife Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality standard for Mercury. All fish collected within the same calendar year with a reported length of 50-150 mm were averaged into a single sample, independent of species or trophic level, for comparison with the objective. This LOE consists of a total of 10 fish, which were aggregated into 1 annual averages, consisting of 1 fish species (10 composite(s) of Golden Shiner each composed of 1 fish per composite). Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Wildlife Contamination in Lakes and Reservoirs.   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Prey Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.05 mg/Kg wet weight whole fish samples of any fish species between 50 to 150 mm in total length collected between February 1 and July 31. (SWRCB Resolution No. 2017-0027) Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 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 170270, Mercury Region 6      Crowley Lake   LOE ID: 132862   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife 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 Sportfish Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 10 fish were aggregated into 1 annual averages, which consisted of 1 fish species (2 composite(s) of Rainbow Trout each composed of 5 fish per composite). Data Reference: Statewide Lakes Sportfish Contamination Study 2007 2008   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 2007-07-26 and 2007-07-26 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP L:akes and Reserviors study QAPP Information Reference(s): Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 132834   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 Wildlife Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 8 fish were aggregated into 1 annual averages, which consisted of 1 fish species (8 composite(s) of Rainbow Trout each composed of 1 fish per composite). Of these annual averages, 1 average(s), (Year(s): 2012) exceeded the objective. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Wildlife Contamination in Lakes and Reservoirs.   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 2007-07-26 and 2007-07-26 Environmental Conditions: QAPP Information: Quality Assurance Program Plan and Standard Operating Procedures for SWAMP L:akes and Reserviors study QAPP Information Reference(s): Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 132834   Pollutant: Mercury LOE Subgroup: Pollutant-Tissue Matrix: Tissue Fraction: Fish fillet   Beneficial Use: Wildlife Habitat   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 Wildlife Contamination in Lakes and Resrv data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality standard for Mercury. This LOE contains data only for trophic level 3 fish. The concentration of Mercury in fish collected within the same calendar year, for the same trophic level were averaged into a single sample for comparison with the objective. A total of 8 fish were aggregated into 1 annual averages, which consisted of 1 fish species (8 composite(s) of Rainbow Trout each composed of 1 fish per composite). Of these annual averages, 1 average(s), (Year(s): 2012) exceeded the objective. Data Reference: Water Quality Assessment Data for the 2018 solicitation cycle submitted through CEDEN for SWAMP Wildlife Contamination in Lakes and Reservoirs.   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The Statewide Sport Fish Water Quality Objective for the protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collectethe protection of Wildlife Habitat comes from the Statewide Water Quality Control Plan for Inland Surface Waters, Enclosed Bays, and Estuaries of California, and is 0.2 mg/Kg wet weight skinless fillet samples of trophic level 3, or trophic level 4 fish (whichever is highest in the water body) over a one year averaging period. If trophic level 3 fish are used in the assessment then the Prey Fish Water Quality Objective must also be used to determine that the Sport Fish Objective is being met. Trophic levels of applicable fish are defined in, but not limited to those in Attachment C of the Final Regulatory Language document (Appendix A) of State Water Resources Control Board Resolution No. 2017-0027. Guideline Reference: Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy   Spatial Representation: Data was collected from 1 station(s) with the station code(s): 603PCW027. Temporal Representation: Data for this line of evidence were collected between 2012-06-26 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 170270, Mercury Region 6      Crowley Lake   LOE ID: 338745   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   d; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Crowley Lake Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Temporal Representation: Data for this line of evidence were collected between 2012-06-26 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 170270, Mercury Region 6      Crowley Lake   LOE ID: 338745   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCD001 (Lake Crowley above Dam). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338751   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   LOE ID: 338751   Pollutant: Mercury LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Dissolved   Beneficial Use: Commercial or recreational collection of fish, shellfish, or organisms   Number of Samples: 1 Number of Exceedances: 0   Data and Information Type: PHYSICAL/CHEMICAL MONITORING Data Used to Assess Water Quality: Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   SWAMP Data: SWAMP   Water Quality Objective/Criterion: The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337179   Pollutant: Mercury LOE Subgroup: Pollutant-Sediment Matrix: Sediment 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury . Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603LCN001 (Lake Crowley near North Landing). Temporal Representation: Data for this waterbody were collected over the date range 2021-07-27 to 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 338755   Pollutant: Mercury 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury. Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 (Water Quality Control Plan, Lahontan Region). Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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: The samples were collected at 1 monitoring site: 603LCN001 (Lake Crowley near North Landing). Temporal Representation: The samples were collected between the dates of 2021-07-27 and 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP   Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake   LOE ID: 337174   Pollutant: Mercury LOE Subgroup: Pollutant-Sediment Matrix: Sediment 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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury . Data Reference: Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6   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 for the Lahontan Region) Objective/Criterion Reference: Water Quality Control Plan for the Lahontan Region (as amended)   Evaluation Guideline: The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a). Guideline Reference: Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31   Spatial Representation: Data were collected from 1 station(s). Station Code(s): 603CCR001 (Crooked Creek below Hwy 395). Temporal Representation: Data for this waterbody were collected over the date range 2021-07-27 to 2021-07-27 Environmental Conditions: QAPP Information: Generic SWAMP QAPrP QAPP Information Reference(s): SWAMP QAPrP
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	The Mercury criteria for the protection of human health from consumption of organisms only is 0.051 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: 603LCN001 (Lake Crowley near North Landing).
Temporal Representation:	The samples were collected between the dates of 2021-07-27 and 2021-07-27
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake
LOE ID:	337179
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603LCN001 (Lake Crowley near North Landing).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-07-27
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake
LOE ID:	338755
Pollutant:	Mercury
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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Mercury.
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 (Water Quality Control Plan, Lahontan Region).
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Recommended Water Quality Criteria Continuous Concentrations (4-day average concentrations) for freshwater aquatic organisms exposure to total mercury is 0.77 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:	The samples were collected at 1 monitoring site: 603LCN001 (Lake Crowley near North Landing).
Temporal Representation:	The samples were collected between the dates of 2021-07-27 and 2021-07-27
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 170270, Mercury Region 6      Crowley Lake
LOE ID:	337174
Pollutant:	Mercury
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Mercury .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603CCR001 (Crooked Creek below Hwy 395).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-07-27
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP

DECISION ID	69432	Region 6
Crowley Lake

Pollutant:	Ammonia
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board conclusion: This pollutant was considered for placement on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. A sufficient number of samples exceed the water quality objective. 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 on the 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. Seven of 38 samples exceeded the ammonia water quality objective and this exceeds 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 69432, Ammonia Region 6      Crowley Lake
LOE ID:	740
Pollutant:	Ammonia
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	38
Number of Exceedances:	7
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Thirty-eight total ammonia samples from Crowley Lake and its outlet are available (Jellison et al., 2003). None of the samples exceeded the one-hour criteria. Every sample collected during the summer months exceed the 4-day criteria, for total of seven exceedances. These data characterize the summer season as the critical condition.
Data Reference:	Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Ammonia concentrations shall not exceed the values listed for the corresponding conditions in Tables 3-1 to 3-4 of the Basin Plan. The ammonia objective is a function of temperature and pH.
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Several stations.
Temporal Representation:	Data were collected in 2000 and 2001.
Environmental Conditions:	The occurrence of elevated ammonia and depressed dissolved oxygen concentrations are associated with the natural eutrophic condition (elevated nutrient levels) of Crowley Lake.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):	QAPP for Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara.

DECISION ID	69432	Region 6
Crowley Lake

Pollutant:	Ammonia
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board conclusion: This pollutant was considered for placement on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. A sufficient number of samples exceed the water quality objective. 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 on the 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. Seven of 38 samples exceeded the ammonia water quality objective and this exceeds 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 69432, Ammonia Region 6      Crowley Lake
LOE ID:	740
Pollutant:	Ammonia
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	38
Number of Exceedances:	7
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Thirty-eight total ammonia samples from Crowley Lake and its outlet are available (Jellison et al., 2003). None of the samples exceeded the one-hour criteria. Every sample collected during the summer months exceed the 4-day criteria, for total of seven exceedances. These data characterize the summer season as the critical condition.
Data Reference:	Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	Ammonia concentrations shall not exceed the values listed for the corresponding conditions in Tables 3-1 to 3-4 of the Basin Plan. The ammonia objective is a function of temperature and pH.
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Several stations.
Temporal Representation:	Data were collected in 2000 and 2001.
Environmental Conditions:	The occurrence of elevated ammonia and depressed dissolved oxygen concentrations are associated with the natural eutrophic condition (elevated nutrient levels) of Crowley Lake.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):	QAPP for Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara.

DECISION ID	161557	Region 6
Crowley Lake

Pollutant:	Arsenic
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
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. Three lines of evidence are available in the administrative record to assess this pollutant. 3 of the 6 sediment samples exceed the evaluation guideline. 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 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. 3 of 6 sediment samples exceed the evaluation guideline and this exceeds 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
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 161557, Arsenic Region 6      Crowley Lake
LOE ID:	336915
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Arsenic .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603LCN001 (Lake Crowley near North Landing).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-09-08
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161557, Arsenic Region 6      Crowley Lake
LOE ID:	336919
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 2 of the 2 samples exceeded the evaluation guideline for Arsenic .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603LCD001 (Lake Crowley above Dam).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-09-08
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161557, Arsenic Region 6      Crowley Lake
LOE ID:	336918
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of the 2 samples exceeded the evaluation guideline for Arsenic .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603CCR001 (Crooked Creek below Hwy 395).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-09-08
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP

DECISION ID	161557	Region 6
Crowley Lake

Pollutant:	Arsenic
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Low
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. Three lines of evidence are available in the administrative record to assess this pollutant. 3 of the 6 sediment samples exceed the evaluation guideline. 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 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. 3 of 6 sediment samples exceed the evaluation guideline and this exceeds 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.
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 161557, Arsenic Region 6      Crowley Lake
LOE ID:	336915
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
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 RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Arsenic .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603LCN001 (Lake Crowley near North Landing).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-09-08
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161557, Arsenic Region 6      Crowley Lake
LOE ID:	336919
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	2
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 2 of the 2 samples exceeded the evaluation guideline for Arsenic .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603LCD001 (Lake Crowley above Dam).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-09-08
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP
Line of Evidence (LOE) for Decision ID 161557, Arsenic Region 6      Crowley Lake
LOE ID:	336918
Pollutant:	Arsenic
LOE Subgroup:	Pollutant-Sediment
Matrix:	Sediment
Fraction:	Total
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	2
Number of Exceedances:	1
Data and Information Type:	PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP RWB6 Monitoring data for Crowley Lake to determine beneficial use support and the results are as follows: 1 of the 2 samples exceeded the evaluation guideline for Arsenic .
Data Reference:	Benthic, Field, Habitat, Tissue, Toxicity, WQ from the Surface Water Ambient Monitoring Program for the 2026 Integrated Report in Region 6
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 for the Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Guideline Reference:	Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31
Spatial Representation:	Data were collected from 1 station(s). Station Code(s): 603CCR001 (Crooked Creek below Hwy 395).
Temporal Representation:	Data for this waterbody were collected over the date range 2021-07-27 to 2021-09-08
Environmental Conditions:
QAPP Information:	Generic SWAMP QAPrP
QAPP Information Reference(s):	SWAMP QAPrP

DECISION ID	70470	Region 6
Crowley Lake

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Medium
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board conclusion: This pollutant was considered for placement on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. A large number of samples exceed the water quality objective. 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 on the 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. Thirty-six of 112 samples do not meet the water quality objective and this exceeds 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 70470, Oxygen, Dissolved Region 6      Crowley Lake
LOE ID:	739
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	112
Number of Exceedances:	36
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Jellison and Dawson (2003) showed that during the summer months at depths below approximately 10 meters, Crowley Lake does not meet the objective. Of 112 samples collected from various in-lake locations, 36 depth-averaged dissolved oxygen measurements were less than 5 mg/L (Jellison et al., 2003).
Data Reference:	Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Basin Plan water quality objective for dissolved oxygen in water bodies designated as COLD and SPWN is an instantaneous concentration minimum of 5 mg/L.
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Several locations.
Temporal Representation:	Data collected in 2000 and 2001.
Environmental Conditions:	The occurrence of elevated ammonia and depressed dissolved oxygen concentrations are associated with the natural eutrophic condition (naturally high nutrient concentrations) of Crowley Lake.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):	QAPP for Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara.

DECISION ID	70470	Region 6
Crowley Lake

Pollutant:	Oxygen, Dissolved
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Revised
Sources:	A Source Unknown
TMDL Priority:	Medium
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board conclusion: This pollutant was considered for placement on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. A large number of samples exceed the water quality objective. 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 on the 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. Thirty-six of 112 samples do not meet the water quality objective and this exceeds 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 70470, Oxygen, Dissolved Region 6      Crowley Lake
LOE ID:	739
Pollutant:	Oxygen, Dissolved
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	112
Number of Exceedances:	36
Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Jellison and Dawson (2003) showed that during the summer months at depths below approximately 10 meters, Crowley Lake does not meet the objective. Of 112 samples collected from various in-lake locations, 36 depth-averaged dissolved oxygen measurements were less than 5 mg/L (Jellison et al., 2003).
Data Reference:	Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	The Basin Plan water quality objective for dissolved oxygen in water bodies designated as COLD and SPWN is an instantaneous concentration minimum of 5 mg/L.
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Several locations.
Temporal Representation:	Data collected in 2000 and 2001.
Environmental Conditions:	The occurrence of elevated ammonia and depressed dissolved oxygen concentrations are associated with the natural eutrophic condition (naturally high nutrient concentrations) of Crowley Lake.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):	QAPP for Assessment of internal nutrient loading to Crowley Lake, Mono County. Santa Barbara, CA: Marine Science Institute. University of CA, Santa Barbara.

DECISION ID	69358	Region 6
Crowley Lake

Pollutant:	Nitrogen
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; original basis for listing was incorrect
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board Conclusion: This pollutant was considered for removal on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. One line of evidence is available in the administrative record to assess this pollutant. Algae blooms were observed in the lake and it was assumed that the concentrations of this nutrient were contributing to the algae blooms. The nutrient levels are not a result of the treatment or disposal of wastes. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the following: No numeric water quality objectives (WQOs) for total nitrogen (N) or phosphorus (P) are established for Crowley Lake. Nuisance conditions, as defined in the Basin Plan, include the requirement that the impairment "occurs during or as a result of the treatment or disposal of wastes." (LRWQCB, 1995, P. 3-15). Because the nitrogen and phosphorus loading to, and associated algal blooms in, Crowley Lake are the result of natural conditions, the algal blooms do not cause nuisance conditions.
Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 69358, Nitrogen Region 6      Crowley Lake
LOE ID:	737
Pollutant:	Nitrogen
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
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:	Nutrient concentrations, sources and limnological information are based on data collected under contract between the Sierra Nevada Aquatic Research Laboratory (SNARL) and the Lahontan RWQCB (Contract numbers 9-175-265-0 and 0-196-160-0). SNARL provided the results of their work in two reports (Jellison and Dawson 2003, Jellison et al., 2003). The sampling program consisted of lake and tributary sampling programs performed in 2000 and 2001.At the time Crowley Lake was placed on the 303(d) list, it was considered impaired by nutrient inputs based on observations of seasonal algae blooms. Land uses such as grazing, fish hatcheries, and residential development were thought to have the potential to be contributing excess nutrients that caused the perceived impairment. However, current studies and evaluation revealed that the lake is naturally eutrophic and that controllable, man-induced nutrient inputs are not significantly affecting the trophic state of the lake and are not impairing beneficial uses. Seasonal occurrences of algae blooms will likely persist in the lake, but they are natural conditions of the lake due to its environmental setting. The nutrient levels are not a result of the treatment or disposal of wastes.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	From the Basin Plan: Biostimulatory Substances: Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses. Basin Plan: Nuisance is defined as "Anything [that] ... occurs during or as a result of the treatment or disposal of waste." (Basin Plan page 3-15)
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Crowley Lake and its seven major tributaries.
Temporal Representation:	Historic (1950-1975) and current (1997; 2000-2001).
Environmental Conditions:	Available historical information on Crowley Lake water quality conditions was reviewed to help assess whether the eutrophic state of the lake is related to anthropogenic sources or is naturally occurring. Information reviewed included that published in the late 1950s and early 1960s by E. P. Pister of the California Department of Fish and Game, the USEPA (1978), based on data collected in 1975, and a 1997 Fisheries Management Plan prepared by Department of Fish and Game.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):

DECISION ID	70763	Region 6
Crowley Lake

Pollutant:	Phosphorus
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; original basis for listing was incorrect
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board conclusion: This pollutant was considered for removal on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. One line of evidence is available in the administrative record to assess this pollutant. Algae blooms were observed in the lake and it was assumed that the concentrations of this nutrient were contributing to the algae blooms. The nutrient levels are not a result of the treatment or disposal of wastes. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the following: No numeric water quality objectives (WQOs) for total nitrogen (N) or phosphorus (P) are established for Crowley Lake. Nuisance conditions, as defined in the Basin Plan, include the requirement that the impairment "occurs during or as a result of the treatment or disposal of wastes." (LRWQCB, 1995, p. 3-15). Because the nitrogen and phosphorus loading to, and associated algal blooms in, Crowley Lake are the result of natural conditions, the algal blooms do not cause nuisance conditions.
Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 70763, Phosphorus Region 6      Crowley Lake
LOE ID:	738
Pollutant:	Phosphorus
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
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:	Nutrient concentrations, sources and limnological information are based on data collected under contract between the Sierra Nevada Aquatic Research Laboratory (SNARL) and the Lahontan RWQCB (Contract numbers 9-175-265-0 and 0-196-160-0). SNARL provided the results of their work in two reports (Jellison and Dawson, 2003; Jellison et al., 2003). The sampling program consisted of lake and tributary sampling programs performed in 2000 and 2001.At the time Crowley Lake was placed on the 303(d) list, it was considered impaired by nutrient inputs based on observations of seasonal algae blooms. Land uses such as grazing, fish hatcheries, and residential development were thought to have the potential to be contributing excess nutrients that caused the perceived impairment. However, current studies and evaluation revealed that the lake is naturally eutrophic and that controllable, man-induced nutrient inputs are not significantly affecting the trophic state of the lake and are not impairing beneficial uses. Seasonal occurrences of algae blooms will likely persist in the lake, but they are natural conditions of the lake due to its environmental setting. The nutrient levels are not a result of the treatment or disposal of wastes.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	From the Basin Plan: Biostimulatory Substances: Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses. Basin Plan: Nuisance is defined as "Anything [that] ... occurs during or as a result of the treatment or disposal of wastes."
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Crowley Lake and its seven major tributaries.
Temporal Representation:	Historic (1950-1975) and current (1997; 2000-2001).
Environmental Conditions:	Available historical information on Crowley Lake water quality conditions was reviewed to help assess whether the eutrophic state of the lake is related to anthropogenic sources or is naturally occurring. Information reviewed included that published in the late 1950s and early 1960s by E. P. Pister of the California Department of Fish and Game, the USEPA (1978), based on data collected in 1975, and a 1997 Fisheries Management Plan prepared by Department of Fish and Game.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):

DECISION ID	69358	Region 6
Crowley Lake

Pollutant:	Nitrogen
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; original basis for listing was incorrect
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board Conclusion: This pollutant was considered for removal on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. One line of evidence is available in the administrative record to assess this pollutant. Algae blooms were observed in the lake and it was assumed that the concentrations of this nutrient were contributing to the algae blooms. The nutrient levels are not a result of the treatment or disposal of wastes. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the following: No numeric water quality objectives (WQOs) for total nitrogen (N) or phosphorus (P) are established for Crowley Lake. Nuisance conditions, as defined in the Basin Plan, include the requirement that the impairment "occurs during or as a result of the treatment or disposal of wastes." (LRWQCB, 1995, P. 3-15). Because the nitrogen and phosphorus loading to, and associated algal blooms in, Crowley Lake are the result of natural conditions, the algal blooms do not cause nuisance conditions.
Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 69358, Nitrogen Region 6      Crowley Lake
LOE ID:	737
Pollutant:	Nitrogen
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
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:	Nutrient concentrations, sources and limnological information are based on data collected under contract between the Sierra Nevada Aquatic Research Laboratory (SNARL) and the Lahontan RWQCB (Contract numbers 9-175-265-0 and 0-196-160-0). SNARL provided the results of their work in two reports (Jellison and Dawson 2003, Jellison et al., 2003). The sampling program consisted of lake and tributary sampling programs performed in 2000 and 2001.At the time Crowley Lake was placed on the 303(d) list, it was considered impaired by nutrient inputs based on observations of seasonal algae blooms. Land uses such as grazing, fish hatcheries, and residential development were thought to have the potential to be contributing excess nutrients that caused the perceived impairment. However, current studies and evaluation revealed that the lake is naturally eutrophic and that controllable, man-induced nutrient inputs are not significantly affecting the trophic state of the lake and are not impairing beneficial uses. Seasonal occurrences of algae blooms will likely persist in the lake, but they are natural conditions of the lake due to its environmental setting. The nutrient levels are not a result of the treatment or disposal of wastes.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	From the Basin Plan: Biostimulatory Substances: Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses. Basin Plan: Nuisance is defined as "Anything [that] ... occurs during or as a result of the treatment or disposal of waste." (Basin Plan page 3-15)
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Crowley Lake and its seven major tributaries.
Temporal Representation:	Historic (1950-1975) and current (1997; 2000-2001).
Environmental Conditions:	Available historical information on Crowley Lake water quality conditions was reviewed to help assess whether the eutrophic state of the lake is related to anthropogenic sources or is naturally occurring. Information reviewed included that published in the late 1950s and early 1960s by E. P. Pister of the California Department of Fish and Game, the USEPA (1978), based on data collected in 1975, and a 1997 Fisheries Management Plan prepared by Department of Fish and Game.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):

DECISION ID	70763	Region 6
Crowley Lake

Pollutant:	Phosphorus
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; original basis for listing was incorrect
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	Regional Board conclusion: This pollutant was considered for removal on the section 303(d) list in a previous assessment cycle. No new information was reviewed for this current assessment cycle. Therefore, the previous conclusion remains unchanged, and is as follows: This pollutant is being considered for removal from the section 303(d) list under section 4.11 of the Listing Policy. One line of evidence is available in the administrative record to assess this pollutant. Algae blooms were observed in the lake and it was assumed that the concentrations of this nutrient were contributing to the algae blooms. The nutrient levels are not a result of the treatment or disposal of wastes. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the following: No numeric water quality objectives (WQOs) for total nitrogen (N) or phosphorus (P) are established for Crowley Lake. Nuisance conditions, as defined in the Basin Plan, include the requirement that the impairment "occurs during or as a result of the treatment or disposal of wastes." (LRWQCB, 1995, p. 3-15). Because the nitrogen and phosphorus loading to, and associated algal blooms in, Crowley Lake are the result of natural conditions, the algal blooms do not cause nuisance conditions.
Regional Board Decision Recommendation:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 70763, Phosphorus Region 6      Crowley Lake
LOE ID:	738
Pollutant:	Phosphorus
LOE Subgroup:	Narrative Description Data
Matrix:	Not Specified
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:	Nutrient concentrations, sources and limnological information are based on data collected under contract between the Sierra Nevada Aquatic Research Laboratory (SNARL) and the Lahontan RWQCB (Contract numbers 9-175-265-0 and 0-196-160-0). SNARL provided the results of their work in two reports (Jellison and Dawson, 2003; Jellison et al., 2003). The sampling program consisted of lake and tributary sampling programs performed in 2000 and 2001.At the time Crowley Lake was placed on the 303(d) list, it was considered impaired by nutrient inputs based on observations of seasonal algae blooms. Land uses such as grazing, fish hatcheries, and residential development were thought to have the potential to be contributing excess nutrients that caused the perceived impairment. However, current studies and evaluation revealed that the lake is naturally eutrophic and that controllable, man-induced nutrient inputs are not significantly affecting the trophic state of the lake and are not impairing beneficial uses. Seasonal occurrences of algae blooms will likely persist in the lake, but they are natural conditions of the lake due to its environmental setting. The nutrient levels are not a result of the treatment or disposal of wastes.
Data Reference:	Placeholder reference 2006 303(d)
SWAMP Data:	Non-SWAMP
Water Quality Objective/Criterion:	From the Basin Plan: Biostimulatory Substances: Waters shall not contain biostimulatory substances in concentrations that promote aquatic growths to the extent that such growths cause nuisance or adversely affect the water for beneficial uses. Basin Plan: Nuisance is defined as "Anything [that] ... occurs during or as a result of the treatment or disposal of wastes."
Objective/Criterion Reference:	Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:	Crowley Lake and its seven major tributaries.
Temporal Representation:	Historic (1950-1975) and current (1997; 2000-2001).
Environmental Conditions:	Available historical information on Crowley Lake water quality conditions was reviewed to help assess whether the eutrophic state of the lake is related to anthropogenic sources or is naturally occurring. Information reviewed included that published in the late 1950s and early 1960s by E. P. Pister of the California Department of Fish and Game, the USEPA (1978), based on data collected in 1975, and a 1997 Fisheries Management Plan prepared by Department of Fish and Game.
QAPP Information:	QA Info Missing
QAPP Information Reference(s):

DECISION ID	74210	Region 6
Crowley Lake

Pollutant:	Aldrin
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one sample exceeded the guideline 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 74210, Aldrin Region 6      Crowley Lake
LOE ID:	45178
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Aldrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78222	Region 6
Crowley Lake

Pollutant:	Chlordane
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one sample exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78222, Chlordane Region 6      Crowley Lake
LOE ID:	45337
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlordane, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total chlordane was calculated as the sum of the following chlordane isomers: cis- and trans-chlordane, cis- and trans-nonachlor, and oxychlordane.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total Chlordane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78222, Chlordane Region 6      Crowley Lake
LOE ID:	45338
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlordane, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total chlordane was calculated as the sum of the following chlordane isomers: cis- and trans-chlordane, cis- and trans-nonachlor, and oxychlordane.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Lahontan Region: Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for total chlordane in fish tissue is 3.9 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78591	Region 6
Crowley Lake

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78591, DDT (Dichlorodiphenyltrichloroethane) Region 6      Crowley Lake
LOE ID:	45183
Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total DDT was calculated as the sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78591, DDT (Dichlorodiphenyltrichloroethane) Region 6      Crowley Lake
LOE ID:	45184
Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total DDT was calculated as the sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Lahontan Region: Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for total DDT in fish tissue is 15 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78386	Region 6
Crowley Lake

Pollutant:	Dieldrin
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one sample exceeded the guideline for the beneficial use of COLD and for this same sample, this data was not used to evaluate for COMM beneficial use because teh reporting limit was above the 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78386, Dieldrin Region 6      Crowley Lake
LOE ID:	45189
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Dieldrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Dieldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78386, Dieldrin Region 6      Crowley Lake
LOE ID:	45190
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). One sample was not used 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.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for dieldrin in fish tissue is 0.32 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78434	Region 6
Crowley Lake

Pollutant:	Endrin
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78434, Endrin Region 6      Crowley Lake
LOE ID:	45173
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Endrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78434, Endrin Region 6      Crowley Lake
LOE ID:	45174
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for endrin in fish tissue is 660 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	73946	Region 6
Crowley Lake

Pollutant:	Heptachlor
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 73946, Heptachlor Region 6      Crowley Lake
LOE ID:	45186
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Heptachlor. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78435	Region 6
Crowley Lake

Pollutant:	Heptachlor epoxide
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guideline for COLD beneficial use; this sample was not evaluated for COMM benefical use because the reporting limit was higher than the 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78435, Heptachlor epoxide Region 6      Crowley Lake
LOE ID:	45191
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Heptachlor epoxide. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor Epoxide concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78435, Heptachlor epoxide Region 6      Crowley Lake
LOE ID:	45192
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor epoxide. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). One sample was not used 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.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for heptachlor epoxide in fish tissue is 0.93 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78436	Region 6
Crowley Lake

Pollutant:	Hexachlorobenzene/ HCB
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the criteria 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78436, Hexachlorobenzene/ HCB Region 6      Crowley Lake
LOE ID:	45179
Pollutant:	Hexachlorobenzene/ HCB
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Hexachlorobenzene. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). 0
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for hexachlorobenzene in fish tissue is 2.8 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78694	Region 6
Crowley Lake

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78694, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 6      Crowley Lake
LOE ID:	45180
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for HCH, gamma. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Lindane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78694, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 6      Crowley Lake
LOE ID:	45185
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for HCH, gamma. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for lindane in fish tissue is 4.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	73841	Region 6
Crowley Lake

Pollutant:	Mirex
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. one lines of evidence are available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of zero samples exceeded the criteria 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 73841, Mirex Region 6      Crowley Lake
LOE ID:	45198
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mirex. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). One sample was not used 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.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for mirex in fish tissue is 0.28 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens.
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78695	Region 6
Crowley Lake

Pollutant:	PCBs (Polychlorinated biphenyls)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78695, PCBs (Polychlorinated biphenyls) Region 6      Crowley Lake
LOE ID:	45329
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for PCB, Total. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total PCB was assessed for as follows: PCB aroclors and congeners were summed separately and the sum that yielded the highest value was used for the assessment.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
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, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total PCB concentration of 500 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78695, PCBs (Polychlorinated biphenyls) Region 6      Crowley Lake
LOE ID:	45330
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for PCB, Total. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total PCB was assessed for as follows: PCB aroclors and congeners were summed separately and the sum that yielded the highest value was used for the assessment.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Lahontan 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 for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for polychlorinated biphenyls in fish tissue is 2.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78170	Region 6
Crowley Lake

Pollutant:	alpha-Endosulfan (Endosulfan 1)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78170, alpha-Endosulfan (Endosulfan 1) Region 6      Crowley Lake
LOE ID:	45195
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endosulfan I. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total Endosulfan concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78170, alpha-Endosulfan (Endosulfan 1) Region 6      Crowley Lake
LOE ID:	45196
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endosulfan I. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for endosulfan (l and ll) in fish tissue is 13,000 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	74210	Region 6
Crowley Lake

Pollutant:	Aldrin
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one sample exceeded the guideline 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 74210, Aldrin Region 6      Crowley Lake
LOE ID:	45178
Pollutant:	Aldrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Aldrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Aldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78222	Region 6
Crowley Lake

Pollutant:	Chlordane
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one sample exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78222, Chlordane Region 6      Crowley Lake
LOE ID:	45337
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlordane, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total chlordane was calculated as the sum of the following chlordane isomers: cis- and trans-chlordane, cis- and trans-nonachlor, and oxychlordane.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total Chlordane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78222, Chlordane Region 6      Crowley Lake
LOE ID:	45338
Pollutant:	Chlordane
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlordane, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total chlordane was calculated as the sum of the following chlordane isomers: cis- and trans-chlordane, cis- and trans-nonachlor, and oxychlordane.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Lahontan Region: Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for total chlordane in fish tissue is 3.9 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78591	Region 6
Crowley Lake

Pollutant:	DDT (Dichlorodiphenyltrichloroethane)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78591, DDT (Dichlorodiphenyltrichloroethane) Region 6      Crowley Lake
LOE ID:	45183
Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total DDT was calculated as the sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total DDT concentration of 1000 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78591, DDT (Dichlorodiphenyltrichloroethane) Region 6      Crowley Lake
LOE ID:	45184
Pollutant:	Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT, Total. One sample composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total DDT was calculated as the sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Lahontan Region: Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life.
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for total DDT in fish tissue is 15 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78386	Region 6
Crowley Lake

Pollutant:	Dieldrin
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one sample exceeded the guideline for the beneficial use of COLD and for this same sample, this data was not used to evaluate for COMM beneficial use because teh reporting limit was above the 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78386, Dieldrin Region 6      Crowley Lake
LOE ID:	45189
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Dieldrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Dieldrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78386, Dieldrin Region 6      Crowley Lake
LOE ID:	45190
Pollutant:	Dieldrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Dieldrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). One sample was not used 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.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for dieldrin in fish tissue is 0.32 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78434	Region 6
Crowley Lake

Pollutant:	Endrin
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78434, Endrin Region 6      Crowley Lake
LOE ID:	45173
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Endrin concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78434, Endrin Region 6      Crowley Lake
LOE ID:	45174
Pollutant:	Endrin
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for endrin in fish tissue is 660 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	73946	Region 6
Crowley Lake

Pollutant:	Heptachlor
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 73946, Heptachlor Region 6      Crowley Lake
LOE ID:	45186
Pollutant:	Heptachlor
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Heptachlor. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78435	Region 6
Crowley Lake

Pollutant:	Heptachlor epoxide
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guideline for COLD beneficial use; this sample was not evaluated for COMM benefical use because the reporting limit was higher than the 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78435, Heptachlor epoxide Region 6      Crowley Lake
LOE ID:	45191
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Heptachlor epoxide. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Heptachlor Epoxide concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78435, Heptachlor epoxide Region 6      Crowley Lake
LOE ID:	45192
Pollutant:	Heptachlor epoxide
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Heptachlor epoxide. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). One sample was not used 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.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for heptachlor epoxide in fish tissue is 0.93 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Public Health Goal for Heptachlor and Heptachlor Epoxide in Drinking Water
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78436	Region 6
Crowley Lake

Pollutant:	Hexachlorobenzene/ HCB
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the criteria 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78436, Hexachlorobenzene/ HCB Region 6      Crowley Lake
LOE ID:	45179
Pollutant:	Hexachlorobenzene/ HCB
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Hexachlorobenzene. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). 0
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for hexachlorobenzene in fish tissue is 2.8 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78694	Region 6
Crowley Lake

Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78694, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 6      Crowley Lake
LOE ID:	45180
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for HCH, gamma. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum Lindane concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78694, Lindane/gamma Hexachlorocyclohexane (gamma-HCH) Region 6      Crowley Lake
LOE ID:	45185
Pollutant:	Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for HCH, gamma. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for lindane in fish tissue is 4.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Air Toxics Hotspots Program Risk Assessment Guidelines. Part ll Technical Support Document for Describing Available Cancer Potency Values.
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	73841	Region 6
Crowley Lake

Pollutant:	Mirex
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. one lines of evidence are available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of zero samples exceeded the criteria 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 73841, Mirex Region 6      Crowley Lake
LOE ID:	45198
Pollutant:	Mirex
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	0
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 0 samples exceed the criterion for Mirex. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). One sample was not used 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.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for mirex in fish tissue is 0.28 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens.
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78695	Region 6
Crowley Lake

Pollutant:	PCBs (Polychlorinated biphenyls)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78695, PCBs (Polychlorinated biphenyls) Region 6      Crowley Lake
LOE ID:	45329
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for PCB, Total. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total PCB was assessed for as follows: PCB aroclors and congeners were summed separately and the sum that yielded the highest value was used for the assessment.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
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, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total PCB concentration of 500 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78695, PCBs (Polychlorinated biphenyls) Region 6      Crowley Lake
LOE ID:	45330
Pollutant:	PCBs (Polychlorinated biphenyls)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for PCB, Total. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). Total PCB was assessed for as follows: PCB aroclors and congeners were summed separately and the sum that yielded the highest value was used for the assessment.
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Water Quality Control Plan, Lahontan 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 for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for polychlorinated biphenyls in fish tissue is 2.6 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day for a 30 year exposure over a 70-year lifetime. This constituent is a carcinogen therefore the risk level is set to one in a million. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments

DECISION ID	78170	Region 6
Crowley Lake

Pollutant:	alpha-Endosulfan (Endosulfan 1)
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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant
Regional Board Conclusion:	This pollutant is being considered for placement on the 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. One line of evidence is available in the administrative record to assess this pollutant. Zero of the samples exceed the water quality 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 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. Zero of one samples exceeded the guidelines for both COLD and COMM beneficial uses 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:	There were no new readily available data or information to assess for this Integrated Report. This decision will remain the same until there is new readily available data or information to assess.
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 78170, alpha-Endosulfan (Endosulfan 1) Region 6      Crowley Lake
LOE ID:	45195
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Cold Freshwater Habitat
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endosulfan I. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	National Academy of Science guidelines (NAS 1972) establish a maximum total Endosulfan concentration of 100 ug/Kg (wet weight) in tissue samples for protection of aquatic life from bioaccumulation of toxic substances.
Guideline Reference:	National Academy of Sciences. Water Quality Criteria 1972. EPA-R3-73-033. Washington, D.C.: U.S. Environmental Protection Agency
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments
Line of Evidence (LOE) for Decision ID 78170, alpha-Endosulfan (Endosulfan 1) Region 6      Crowley Lake
LOE ID:	45196
Pollutant:	alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:	Pollutant-Tissue
Matrix:	Tissue
Fraction:	Fish fillet
Beneficial Use:	Commercial or recreational collection of fish, shellfish, or organisms
Number of Samples:	1
Number of Exceedances:	0
Data and Information Type:	Fish tissue analysis
Data Used to Assess Water Quality:	Water Board staff assessed SWAMP data for Crowley Lake to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endosulfan I. One composite (10 fish per composite) was generated from one species: rainbow trout. Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009).
Data Reference:	Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA
	Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008
	Statewide Lakes Sportfish Contamination Study 2007 2008
	Contaminants in Fish from California Lakes and Reservoirs, 2007-2008: Summary Report on a Two-Year Screening Survey
SWAMP Data:	SWAMP
Water Quality Objective/Criterion:	Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable levels, using the most recent detection procedures available. There shall not be an increase in pesticide concentrations found in bottom sediments. There shall be no detectable increase in bioaccumulation of pesticides in aquatic life. (Water Quality Control Plan, Lahontan Region)
Objective/Criterion Reference:	Water Quality Control Plan for the Lahontan Region (as amended)
Evaluation Guideline:	The modified OEHHA Fish Contaminant Goal for endosulfan (l and ll) in fish tissue is 13,000 ppb. This screening level assumes an average body weight of 70 kg and a consumption rate of 32 g/day. A cooking reduction factor of 1 is applied for skin-off fillets.
Guideline Reference:	Development of Fish Contaminant Goals and Advisory Tissue Levels for Common Contaminants in California Sport Fish: Chlordane, DDTs, Dieldrin, Methylmercury, PCBs, Selenium, and Toxaphene
Guideline Reference:	Guidance for Assessing Chemical Contaminant Data for Use In Fish Advisories Volume 1: Fish Sampling and Analysis
Spatial Representation:	Data for this line of evidence for Crowley Lake was collected at 1 monitoring site [ Lake Crowley - 603PCW027]. Samples were collected from 2 locations. Individual sample locations consisted of an area within a given waterbody from which fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody (SWAMP, 2010). Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008).
Temporal Representation:	Data was collected on a single day 7/26/2007.
Environmental Conditions:	Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:	Samples were collected, processed, and analyzed in accordance with the methods described in Quality Assurance Project Plan "Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008).
QAPP Information Reference(s):	Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for SWAMP BOG, 49 pages plus appendices and attachments