Final California 2026 Integrated Report (303(d) List/305(b) Report)
Supporting Information
Regional Board 5 - Central Valley Region
Water Body Name:
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Water Body ID:
CAR5311100020221118037585
Water Body Type:
River & Stream
DECISION ID
165396
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Mercury
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)(2024)
Revision Status
Revised
Reason for Delisting:
Flaws in original listing
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section 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. Zero of 9 sediment samples exceed the guideline the COLD beneficial use.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the sediment samples exceeded the guideline for the COLD beneficial use and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are 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 removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 165396, Mercury
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309285
Pollutant:
Mercury
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for Mercury .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Mercury from MacDonald et al., 2000a which states that the probable effect concentration for Mercury is 1.06 mg/kg. (dw = Dry Weight)
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for mercury is 1.06 mg/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Mercury
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)(2024)
Revision Status
Revised
Reason for Delisting:
Flaws in original listing
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section 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. Zero of 9 sediment samples exceed the guideline the COLD beneficial use.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the sediment samples exceeded the guideline for the COLD beneficial use and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are 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 removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 165396, Mercury
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309285
Pollutant:
Mercury
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for Mercury .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Mercury from MacDonald et al., 2000a which states that the probable effect concentration for Mercury is 1.06 mg/kg. (dw = Dry Weight)
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for mercury is 1.06 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 165396, Mercury
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333222
Pollutant:
Mercury
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Mercury .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 165396, Mercury
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333222
Pollutant:
Mercury
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Mercury .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for mercury is the probable effect concentration (PEC) of 1.06 mg/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Indicator Bacteria
Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)(2024)
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 removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Historical bacteria LOEs (pre-2010 data) have been removed and data has been compared to the newer E. coli bacteria water quality objective. Ten of 58 samples, calculated as Statistical Threhold Values, for E. coli exceeded the E. coli bacteria objective for REC-1.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Ten of 58 samples, calculated as Statistical Threhold Values, for E. coli exceeded the E. coli bacteria objective for REC-1 and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
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:
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 161516, Indicator Bacteria
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309253
Pollutant:
Escherichia coli (E. coli)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
13
Number of Exceedances:
2
Data and Information Type:
PATHOGEN MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 2 of the 13 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a STATISTICAL THRESHOLD VALUE (STV) of 320 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).
Line of Evidence (LOE) for Decision ID 161516, Indicator Bacteria
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
329438
Pollutant:
Escherichia coli (E. coli)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
STV
Beneficial Use:
Water Contact Recreation
Number of Samples:
45
Number of Exceedances:
8
Data and Information Type:
PATHOGEN MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 8 of the 45 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Indicator Bacteria
Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)(2024)
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 removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Historical bacteria LOEs (pre-2010 data) have been removed and data has been compared to the newer E. coli bacteria water quality objective. Ten of 58 samples, calculated as Statistical Threhold Values, for E. coli exceeded the E. coli bacteria objective for REC-1.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Ten of 58 samples, calculated as Statistical Threhold Values, for E. coli exceeded the E. coli bacteria objective for REC-1 and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
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:
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 161516, Indicator Bacteria
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309253
Pollutant:
Escherichia coli (E. coli)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
13
Number of Exceedances:
2
Data and Information Type:
PATHOGEN MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 2 of the 13 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a STATISTICAL THRESHOLD VALUE (STV) of 320 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).
Line of Evidence (LOE) for Decision ID 161516, Indicator Bacteria
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
329438
Pollutant:
Escherichia coli (E. coli)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
STV
Beneficial Use:
Water Contact Recreation
Number of Samples:
45
Number of Exceedances:
8
Data and Information Type:
PATHOGEN MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 8 of the 45 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.
The bacteria water quality objective to protect the REC-1 beneficial use where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oxygen, Dissolved
Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)(2024)
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 removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Twenty-four lines of evidence are available in the administrative record to assess this pollutant. Thirty-four of 96 samples exceed the objective for Fish Spawning and 38 of 239 samples reported as total or no fraction exceed the objective for Cold Freshwater Habitat.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3.Thirty-four of 96 samples exceed the objective for Fish Spawning and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
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:
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 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309242
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Ag Waiver data to determine beneficial use support: None of 6 sample results exceed the criterion for Oxygen, Dissolved.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oxygen, Dissolved
Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)(2024)
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 removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Twenty-four lines of evidence are available in the administrative record to assess this pollutant. Thirty-four of 96 samples exceed the objective for Fish Spawning and 38 of 239 samples reported as total or no fraction exceed the objective for Cold Freshwater Habitat.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3.Thirty-four of 96 samples exceed the objective for Fish Spawning and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
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:
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 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309242
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Ag Waiver data to determine beneficial use support: None of 6 sample results exceed the criterion for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309312
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 5 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309312
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 5 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309340
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309341
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Cotext-align: left; PADDING-TOP: 3px; font-smooth: always">Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309340
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309341
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309342
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309342
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309343
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309344
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
15
Number of Exceedances:
11
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 11 of 15 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Environmental Conditions:
QAPP Information:
SWAMP 2008Total
Beneficial Use:
Fish Spawning
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309344
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
15
Number of Exceedances:
11
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 11 of 15 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309345
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
15
Number of Exceedances:
11
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 11 of 15 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309346
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality standard for Oxygen, Dissolvd>
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309345
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
15
Number of Exceedances:
11
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 11 of 15 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309346
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309347
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309347
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309348
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309349
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309348
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309349
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309350
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5 &nbsleft" valign="top" width="33%">Water Quality Objective/Criterion:
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309350
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309351
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309198
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
122
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
One hundred twenty two water samples were taken from the Cosumnes River from October 2000 through August 2006. 3 samples exceed Water Quality Objectives for minimum dissolved oxygen content (7 mg/L) and 1 sample exceeds 5 mg/L.
Sacramento/San Joaquin River Basin Plan (CVRWQCB, 2007a): (COLD), Minimum Dissolved Oxygen concentration of 7mg/p;
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309351
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality standard for Oxygen, Dissolved.
The Basin Plan objective for dissolved oxygen in this water body is 7 mg/L expressed as a 7 day minimum averaging period.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309198
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
122
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
One hundred twenty two water samples were taken from the Cosumnes River from October 2000 through August 2006. 3 samples exceed Water Quality Objectives for minimum dissolved oxygen content (7 mg/L) and 1 sample exceeds 5 mg/L.
Samples were collected from four locations including Twin Cities Road, Gold Beach Park, Highway 49, and Michigan Bar Road.
Temporal Representation:
Samples were collected between October 2000 and August 2006 at variable intervals (e.g. weekly, bimonthly, monthly).
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309199
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
13 samples were taken from the Cosumnes River from January 2005 through August 2006. 1 sample exceeds Water Quality Objectives for minimum dissolved oxygen content (7 mg/L) and 1 sample exceeds 5 mg/L.
Samples were collected between January 2005 and August 2006 at variable intervals (e.g. bimonthly, monthly).
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number R5-2003-0826) requirements (CVRWQCB, 2003)
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Samples were collected from four locations including Twin Cities Road, Gold Beach Park, Highway 49, and Michigan Bar Road.
Temporal Representation:
Samples were collected between October 2000 and August 2006 at variable intervals (e.g. weekly, bimonthly, monthly).
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309199
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
13 samples were taken from the Cosumnes River from January 2005 through August 2006. 1 sample exceeds Water Quality Objectives for minimum dissolved oxygen content (7 mg/L) and 1 sample exceeds 5 mg/L.
Samples were collected between January 2005 and August 2006 at variable intervals (e.g. bimonthly, monthly).
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number R5-2003-0826) requirements (CVRWQCB, 2003)
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332146
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
54
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 54 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332024
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality ContING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332146
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
54
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 54 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332024
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2019-07-20 and 2021-09-17
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332150
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332150
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332145
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
54
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 54 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332087
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-" valign="top" width="33%">Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
54
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 54 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332087
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332086
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332025
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
6
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2019-07-20 and 2021-09-17
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332151
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332086
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332025
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
6
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2019-07-20 and 2021-09-17
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160489, Oxygen, Dissolved
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332151
Pollutant:
Oxygen, Dissolved
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Fish Spawning
Number of Samples:
3
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 3 of 3 samples exceeded the water quality threshold for Oxygen, Dissolved.
The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Toxicity
Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Sources:
A Source Unknown
TMDL Priority:
Low
Expected Attainment Date:
2020
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Ten lines of evidence are available in the administrative record to assess this pollutant. Two of the 54 water samples, reported as "total" fraction or as fraction reported as "none", exceeded the objective for the aquatic life beneficial use.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of the 54 water samples, reported as "total" fraction or as fraction reported as "none", exceeded the objective for the aquatic life beneficial use, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
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:
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 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347489
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
31
Number of Exceedances:
1
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
1 of the 31 samples collected by Sacramento Valley Water Quality Coalition for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Selenastrum capricornutum for Total Cell Count, Pimephales promelas for Survival, Ceriodaphnia dubia for Survival, Hyalella azteca for Survival. The following tests exhibited toxicity: Hyal
DECISION ID
160498
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Toxicity
Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not Delist from 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Sources:
A Source Unknown
TMDL Priority:
Low
Expected Attainment Date:
2020
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for removal from the CWA section 303(d) List under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Ten lines of evidence are available in the administrative record to assess this pollutant. Two of the 54 water samples, reported as "total" fraction or as fraction reported as "none", exceeded the objective for the aquatic life beneficial use.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of the 54 water samples, reported as "total" fraction or as fraction reported as "none", exceeded the objective for the aquatic life beneficial use, and this exceeds the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.
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:
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 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347489
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
31
Number of Exceedances:
1
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
1 of the 31 samples collected by Sacramento Valley Water Quality Coalition for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Selenastrum capricornutum for Total Cell Count, Pimephales promelas for Survival, Ceriodaphnia dubia for Survival, Hyalella azteca for Survival. The following tests exhibited toxicity: Hyalella azteca for Survival on 2021-03-24.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347488
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
9
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 9 samples collected by Sacramento Valley Water Quality Coalition for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347488
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
9
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 9 samples collected by Sacramento Valley Water Quality Coalition for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309254
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 8 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309194
Pollutant:
Unknown Toxicity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
17
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
One of the 17 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Unknown Toxicity-Pimephales promelas.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Nov 29 2005
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309195
Pollutant:
Unknown Toxicity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
16
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Zero of the 16 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Unknown Toxicity-Ceriodaphia dubia.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309254
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 8 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309194
Pollutant:
Unknown Toxicity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
17
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
One of the 17 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Unknown Toxicity-Pimephales promelas.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Nov 29 2005
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309195
Pollutant:
Unknown Toxicity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
16
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Zero of the 16 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Unknown Toxicity-Ceriodaphia dubia.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Dec 26 2001 to Nov 29 2006
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309197
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Warm Freshwater Habitat
Aquatic Life Use:
Warm Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
1
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0/1 and 1/2 (1/3 total) samples tested with Hyalella azteca were toxic and violated the narrative toxicity objective.The sample collected 9 October 2001 at Michigan Bar exhibited 79% survival (83% of control) and no significant decrease in growth.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CVRWQCB, 2007)
Samples were collected from the Cosumnes River at Highway 49 and Michigan Bar
Temporal Representation:
Samples were collected May 2002 and from October 2001 - May 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Dec 26 2001 to Nov 29 2006
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309197
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Warm Freshwater Habitat
Aquatic Life Use:
Warm Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
1
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0/1 and 1/2 (1/3 total) samples tested with Hyalella azteca were toxic and violated the narrative toxicity objective.The sample collected 9 October 2001 at Michigan Bar exhibited 79% survival (83% of control) and no significant decrease in growth.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CVRWQCB, 2007)
Samples were collected from the Cosumnes River at Highway 49 and Michigan Bar
Temporal Representation:
Samples were collected May 2002 and from October 2001 - May 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309200
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
One sample was collected to evaluate sediment toxicity. The sample did not exhibit significant toxicity. The toxicity test included survival of Hyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309200
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
One sample was collected to evaluate sediment toxicity. The sample did not exhibit significant toxicity. The toxicity test included survival of Hyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309201
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
2
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
Three samples were collected to evaluate sedimenttoxicity. Two of the samples exhibited significant toxicity. The toxicity tests included survival ofHyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted using the significant effect code: S equals significant, SG equals significantly greater and SL equals significantly lower. If a sample has any one of these codes, it will be considered an exceedance.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309202
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Water
Fraction:
None
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
Six samples were collected to evaluate water toxicity. None of the samples exhibited significant toxicity. The toxicity tests included survival of Ceriodaphnia dubia, survival of Pimephales promelas, and total cell count of Selenastrum capricornutum. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, ign="top" width="33%">Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
2
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
Three samples were collected to evaluate sedimenttoxicity. Two of the samples exhibited significant toxicity. The toxicity tests included survival ofHyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted using the significant effect code: S equals significant, SG equals significantly greater and SL equals significantly lower. If a sample has any one of these codes, it will be considered an exceedance.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309202
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Water
Fraction:
None
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
Six samples were collected to evaluate water toxicity. None of the samples exhibited significant toxicity. The toxicity tests included survival of Ceriodaphnia dubia, survival of Pimephales promelas, and total cell count of Selenastrum capricornutum. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided).
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold. This data set reports a simple pass/fail (Yes/No) code to report toxicity that is equivalent to the SWAMP SL code.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347510
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 2 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival, Hyalella azteca for Growth (wt/surv indiv).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold. This data set reports a simple pass/fail (Yes/No) code to report toxicity that is equivalent to the SWAMP SL code.
Line of Evidence (LOE) for Decision ID 160498, Toxicity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347510
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 2 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival, Hyalella azteca for Growth (wt/surv indiv).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
2,4-D (2,4-Dichlorophenoxy acetic acid)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160487, 2,4-D (2,4-Dichlorophenoxy acetic acid)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331350
Pollutant:
2,4-D (2,4-Dichlorophenoxy acetic acid)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.
The California Primary Maximum Contaminant Level for 2, 4-D incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2018-02-20 and 2018-03-14
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160487, 2,4-D (2,4-Dichlorophenoxy acetic acid)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331347
Pollutant:
2,4-D (2,4-Dichlorophenoxy acetic acid)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dichlorophenoxyacetic acid, 2,4- (2,4-D) is the USEPA Aquatic Life Benchmark of 299.2 ug/L for a vascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Acetamiprid
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160452, Acetamiprid
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330601
Pollutant:
Acetamiprid
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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Acetamiprid.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for acetamiprid is the USEPA Aquatic Life Benchmark of 2.1 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Aldicarb
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160520, Aldicarb
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330605
Pollutant:
Aldicarb
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Aldicarb.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
2,4-D (2,4-Dichlorophenoxy acetic acid)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160487, 2,4-D (2,4-Dichlorophenoxy acetic acid)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331350
Pollutant:
2,4-D (2,4-Dichlorophenoxy acetic acid)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.
The California Primary Maximum Contaminant Level for 2, 4-D incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.07 mg/L
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2018-02-20 and 2018-03-14
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160487, 2,4-D (2,4-Dichlorophenoxy acetic acid)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331347
Pollutant:
2,4-D (2,4-Dichlorophenoxy acetic acid)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dichlorophenoxyacetic Acid, 2,4-.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dichlorophenoxyacetic acid, 2,4- (2,4-D) is the USEPA Aquatic Life Benchmark of 299.2 ug/L for a vascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Acetamiprid
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160452, Acetamiprid
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330601
Pollutant:
Acetamiprid
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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Acetamiprid.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for acetamiprid is the USEPA Aquatic Life Benchmark of 2.1 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Aldrin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160521, Aldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330607
Pollutant:
Aldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160521, Aldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330609
Pollutant:
Aldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Aldrin.
The aldrin criterion maximum concentration (expressed as a 1-day average) to protect aquatic life in freshwater is 1.5 ug/L. The criterion of 3 ug/L provided in the California Toxics Rule is an instantaneous maximum concentration and was divided by 2 in order to better represent a criterion maximum concentration (CMC) value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule (2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Aldicarb
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160520, Aldicarb
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330605
Pollutant:
Aldicarb
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Aldicarb.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for aldicarb is the USEPA Aquatic Life Benchmark of 0.46 ug/L for a fish (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Alkalinity as CaCO3
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152212, Alkalinity as CaCO3
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309297
Pollutant:
Alkalinity as CaCO3
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Alkalinity as CaCO3 levels were assessed for the protection of freshwater aquatic life by comparison to the Evaluation Guideline value of 20,000 ug/L (4 day average)(National Recommended Water Quality Criteria, 2009).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Aldrin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160521, Aldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330607
Pollutant:
Aldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Aldrin. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160521, Aldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330609
Pollutant:
Aldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Aldrin.
The aldrin criterion maximum concentration (expressed as a 1-day average) to protect aquatic life in freshwater is 1.5 ug/L. The criterion of 3 ug/L provided in the California Toxics Rule is an instantaneous maximum concentration and was divided by 2 in order to better represent a criterion maximum concentration (CMC) value as specified in footnote (g) of Table (b)(1) of the California Toxics Rule (2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Allethrin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160447, Allethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330659
Pollutant:
Allethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Allethrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for allethrin is the USEPA Aquatic Life Benchmark of 1.05 ug/L for an invertebrate (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Alkalinity as CaCO3
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152212, Alkalinity as CaCO3
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309297
Pollutant:
Alkalinity as CaCO3
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Alkalinity as CaCO3.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Alkalinity as CaCO3 levels were assessed for the protection of freshwater aquatic life by comparison to the Evaluation Guideline value of 20,000 ug/L (4 day average)(National Recommended Water Quality Criteria, 2009).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Allethrin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160447, Allethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330659
Pollutant:
Allethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Allethrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for allethrin is the USEPA Aquatic Life Benchmark of 1.05 ug/L for an invertebrate (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Ammonia
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 167288, Ammonia
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330730
Pollutant:
Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
22
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Ammonia as N.
The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia Freshwater 2013 document.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Ammonia
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 167288, Ammonia
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330730
Pollutant:
Nitrogen, ammonia (Total Ammonia)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
22
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 22 samples exceeded the water quality threshold for Ammonia as N.
The Total Ammonia criterion continuous concentration (expressed as a 30-day average) to protect aquatic life in freshwater is Temperature and pH dependent, and was calculated according to the formula listed in the Aquatic Life Ambient Water Quality Criteria for Ammonia Freshwater 2013 document.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Ammonia as N, Total
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
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 five 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 five samples exceeded the evaluation guideline and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152210, Ammonia as N, Total
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309248
Pollutant:
Ammonia as N, Total
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Aquatic Life Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Five water samples were collected from Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) by the Sacramento Valley Water Quality Coalition and were analyzed for Ammonia as N, pH and temperature. Samples collected from the same monitoring station and on the same date were averaged before they were assessed. A total of five samples were assessed and all of the analytical results were below the calculated CMC Evaluation Guideline value.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).
Data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at one monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN].
Temporal Representation:
Ammonia data was collected monthly between 2/16/2009 and 6/18/2009
Environmental Conditions:
QAPP Information:
Data collected under the QAPP for the Sacramento Valley Water Quality Coalition.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Ammonia as N, Total
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
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 five 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 five samples exceeded the evaluation guideline and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152210, Ammonia as N, Total
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309248
Pollutant:
Ammonia as N, Total
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Aquatic Life Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Five water samples were collected from Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) by the Sacramento Valley Water Quality Coalition and were analyzed for Ammonia as N, pH and temperature. Samples collected from the same monitoring station and on the same date were averaged before they were assessed. A total of five samples were assessed and all of the analytical results were below the calculated CMC Evaluation Guideline value.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances.
Per the National Recommended Water Quality Criteria (USEPA 2006): The 1-hour average concentration (acute criterion or CMC) of total ammonia nitrogen (in mg N/L) for freshwater where salmonid fish are present, which is not to be exceeded more than once every three years on average, is calculated using the following equation: CMC=0.275/(1+10^(7.204 - pH)) + 39.0/(1+10^(pH - 7.204)).
Data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at one monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN].
Temporal Representation:
Ammonia data was collected monthly between 2/16/2009 and 6/18/2009
Environmental Conditions:
QAPP Information:
Data collected under the QAPP for the Sacramento Valley Water Quality Coalition.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Anthracene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152175, Anthracene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309257
Pollutant:
Anthracene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Anthracene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Anthrazene from MacDonald et al., 2000a which states that the probable effect concentration for Anthracene is 845 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for anthracene is 845 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Anthracene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152175, Anthracene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309257
Pollutant:
Anthracene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Anthracene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Anthrazene from MacDonald et al., 2000a which states that the probable effect concentration for Anthracene is 845 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for anthracene is 845 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Arsenic
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333098
Pollutant:
Arsenic
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Arsenic .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Wate
DECISION ID
160450
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Arsenic
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333098
Pollutant:
Arsenic
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Arsenic .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for arsenic is the probable effect concentration (PEC) of 33 mg/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330789
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Arsenic.
The California Primary Maximum Contaminant Level for arsenic incorporated by reference in the Basin Plan is 0.010 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2011-12-07
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330771
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Arsenic.
The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309258
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Arsenic .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Arsenic from MacDonald et al., 2000a which states that the probable effect concentration for Arsenic is 33 mg/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330789
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Arsenic.
The California Primary Maximum Contaminant Level for arsenic incorporated by reference in the Basin Plan is 0.010 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2011-12-07
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between March 25, 2003 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309174
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
None of the 10 samples collected by the Surface Water Ambient Monitoring Program exceeded the CTR criterion of 340 ug/L for dissolved arsenic
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between June 26, 2001 and June 25, 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Arsenic.
The dissolved arsenic criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 150 ug/L. The conversion factor used to convert the total fraction criterion for arsenic to dissolved fraction criterion is 1. Therefore all data was considered to be representative of the dissolved fraction. (California Toxics Rule, 2000)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309258
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Arsenic .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Arsenic from MacDonald et al., 2000a which states that the probable effect concentration for Arsenic is 33 mg/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160450, Arsenic
DECISION ID
160453
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Atrazine
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160453, Atrazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330794
Pollutant:
Atrazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Atrazine.
The California Primary Maximum Contaminant Level for atrazine incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2018-06-19 and 2019-06-18
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160453, Atrazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330796
Pollutant:
Atrazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Atrazine.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity.
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between March 25, 2003 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160450, Arsenic
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309174
Pollutant:
Arsenic
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
None of the 10 samples collected by the Surface Water Ambient Monitoring Program exceeded the CTR criterion of 340 ug/L for dissolved arsenic
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between June 26, 2001 and June 25, 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
DECISION ID
160473
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Azinphos-methyl (Guthion)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160473, Azinphos-methyl (Guthion)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330803
Pollutant:
Azinphos-methyl (Guthion)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benomyl
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160502, Benomyl
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330808
Pollutant:
Benomyl
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Benomyl.
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.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The California Department of Fish and Wildlife instantaneous criterion (1-hour average) for Benomyl is 8.8 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Atrazine
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160453, Atrazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330794
Pollutant:
Atrazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Atrazine.
The California Primary Maximum Contaminant Level for atrazine incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2018-06-19 and 2019-06-18
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160453, Atrazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330796
Pollutant:
Atrazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Atrazine.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Atrazine is the USEPA Aquatic Life Benchmark of < 1 ug/L for a nonvascular plant (acute). The benchmark was derived from a 'less-than' value (for example, <1,500) and may underestimate toxicity.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benthic Community Effects
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects.
One line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. One of one benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, a minimum of two benthic-macroinvertebrate samples are needed to assess listing status.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. The available information is insufficient to determine whether the waterbody/pollutant combination should be placed on the 303(d) List of impaired waters at this time. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152213, Benthic Community Effects
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309338
Pollutant:
Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:
Population/Community Degradation
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
1
Data and Information Type:
Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:
Water Board staff assessed data for 532PS0667 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the threshold. CSCI scores were from 0.722794577 to 0.722794577.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rehn, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Azinphos-methyl (Guthion)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160473, Azinphos-methyl (Guthion)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330803
Pollutant:
Azinphos-methyl (Guthion)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Azinphos Methyl. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA National Recommended Water Quality Criteria for azinphos methyl for freshwater aquatic life protection is 0.01 ug/l (instantaneous maximum)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benomyl
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160502, Benomyl
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330808
Pollutant:
Benomyl
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Benomyl.
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.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The California Department of Fish and Wildlife instantaneous criterion (1-hour average) for Benomyl is 8.8 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benzo(a)anthracene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152176, Benzo(a)anthracene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309256
Pollutant:
Benzo(a)anthracene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Benz(a)anthracene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Benz[a]anthrazene from MacDonald et al., 2000a which states that the probable effect concentration for Benz[a]anthrazene is 1050 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for Benzo(a)anthracene is 1050 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benthic Community Effects
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects.
One line(s) of evidence evaluating benthic-macroinvertebrate bioassessment data is/are available in the administrative record to assess this indicator. One of one benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. However, a minimum of two benthic-macroinvertebrate samples are needed to assess listing status.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this waterbody segment on the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. The available information is insufficient to determine whether the waterbody/pollutant combination should be placed on the 303(d) List of impaired waters at this time. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152213, Benthic Community Effects
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309338
Pollutant:
Benthic-Macroinvertebrate Bioassessments
LOE Subgroup:
Population/Community Degradation
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
1
Data and Information Type:
Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:
Water Board staff assessed data for 532PS0667 to determine beneficial use support and the results are as follows: 1 of 1 samples exceeded the threshold. CSCI scores were from 0.722794577 to 0.722794577.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rehn, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benzo(a)pyrene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152177, Benzo(a)pyrene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309255
Pollutant:
Benzo(a)pyrene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Benzo(a)pyrene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Benzo[a]pyrene from MacDonald et al., 2000a which states that the probable effect concentration for Benzo[a]pyrene is 1450 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Benzo(a)Pyrene is 1,450 ug/Kg dry weight (Macdonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benzo(a)anthracene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152176, Benzo(a)anthracene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309256
Pollutant:
Benzo(a)anthracene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Benz(a)anthracene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Benz[a]anthrazene from MacDonald et al., 2000a which states that the probable effect concentration for Benz[a]anthrazene is 1050 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for Benzo(a)anthracene is 1050 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Bifenthrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309259
Pollutant:
Bifenthrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 5 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
DECISION ID
152177
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Benzo(a)pyrene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152177, Benzo(a)pyrene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309255
Pollutant:
Benzo(a)pyrene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Benzo(a)pyrene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Benzo[a]pyrene from MacDonald et al., 2000a which states that the probable effect concentration for Benzo[a]pyrene is 1450 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Benzo(a)Pyrene is 1,450 ug/Kg dry weight (Macdonald et al. 2000).
07/ref2434.zip" >Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
Evaluation Guideline:
The evaluation guideline for bifenthrin, 0.043 ug/g, is one-tenth of the median lethal concentration (LC50; 0.43 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309210
Pollutant:
Bifenthrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for bifenthrin, 0.043 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.43 ug/g OC). The LC50 (0.43 ug/g OC) is the geometric mean of OC-normalized LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333110
Pollutant:
Bifenthrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 1 of the 2 samples exceeded the evaluation guideline for Bifenthrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for bifenthrin, 0.043 ug/g, is one-tenth of the median lethal concentration (LC50; 0.43 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330834
Pollutant:
Bifenthrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater 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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Bifenthrin. Although a total of 13 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for bifenthrin is 0.1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Boron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152164, Boron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309180
Pollutant:
Boron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Noneof the 13 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective of 1,000 ug/L for boron
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between October 24, 2000 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
DECISION ID
160510
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Bifenthrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309259
Pollutant:
Bifenthrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Bifenthrin. Although a total of 5 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
DECISION ID
160503
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Bromacil
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160503, Bromacil
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330867
Pollutant:
Bromacil
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromacil.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Bromacil is the USEPA Aquatic Life Benchmark of 6.8 ug/L for a nonvascular plant (acute).
07/ref2434.zip" >Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
Evaluation Guideline:
The evaluation guideline for bifenthrin, 0.043 ug/g, is one-tenth of the median lethal concentration (LC50; 0.43 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309210
Pollutant:
Bifenthrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for bifenthrin, 0.043 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.43 ug/g OC). The LC50 (0.43 ug/g OC) is the geometric mean of OC-normalized LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333110
Pollutant:
Bifenthrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 1 of the 2 samples exceeded the evaluation guideline for Bifenthrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for bifenthrin, 0.043 ug/g, is one-tenth of the median lethal concentration (LC50; 0.43 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007).
Line of Evidence (LOE) for Decision ID 160510, Bifenthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330834
Pollutant:
Bifenthrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater 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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 1 of the 1 samples exceeded the water quality threshold for Bifenthrin. Although a total of 13 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for bifenthrin is 0.1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of bifenthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Boron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152164, Boron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309180
Pollutant:
Boron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Noneof the 13 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective of 1,000 ug/L for boron
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between October 24, 2000 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
DECISION ID
160454
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cadmium
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309175
Pollutant:
Cadmium
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Zero of the 1 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Cadmium.
Dissolved Cadmium levels should not exceed the calculated limit based on the formula: Criteria Maximum Concentration (1-hour Average dissolved)=(EXP(1.128*LN(hardness)-3.6867))*(1.136672-(LN(hardness)*0.041838)) (CTR)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Bromacil
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160503, Bromacil
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330867
Pollutant:
Bromacil
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Bromacil.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Bromacil is the USEPA Aquatic Life Benchmark of 6.8 ug/L for a nonvascular plant (acute).
re collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The sample was collected on November 27 2001.
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309182
Pollutant:
Cadmium
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
None of the 4 samples collected by the Surface Water Ambient Monitoring Program exceeded the California Primary MCL of 5 ug/L for total cadmium
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between March 25, 2003 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309261
Pollutant:
Cadmium
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Cadmium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Cadmium from MacDonald et al., 2000a which states that the probable effect concentration for Cadmium is 4.98 mg/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333124
Pollutant:
Cadmium
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Cadmium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for cadmium is the probable effect concentration (PEC) of 4.98 mg/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Carbaryl
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160455, Carbaryl
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330908
Pollutant:
Carbaryl
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbaryl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA recommended water quality criterion for freshwater aquatic life for carbaryl is 2.1 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cadmium
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309175
Pollutant:
Cadmium
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Zero of the 1 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Cadmium.
Dissolved Cadmium levels should not exceed the calculated limit based on the formula: Criteria Maximum Concentration (1-hour Average dissolved)=(EXP(1.128*LN(hardness)-3.6867))*(1.136672-(LN(hardness)*0.041838)) (CTR)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The sample was collected on November 27 2001.
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309182
Pollutant:
Cadmium
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
None of the 4 samples collected by the Surface Water Ambient Monitoring Program exceeded the California Primary MCL of 5 ug/L for total cadmium
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between March 25, 2003 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309261
Pollutant:
Cadmium
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Cadmium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Cadmium from MacDonald et al., 2000a which states that the probable effect concentration for Cadmium is 4.98 mg/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000).
Data for this line of evidence was collected at one monitoring site [ Cosumnes River at Twin Cities Road - 531SAC001]
DECISION ID
160456
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Carbofuran
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160456, Carbofuran
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330916
Pollutant:
Carbofuran
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Carbofuran.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The interim water quality criterion for the protection of sensitive aquatic organisms from Carbofuran is 0.5 ug/l (DFG 92-3, 1992).
Line of Evidence (LOE) for Decision ID 160456, Carbofuran
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330914
Pollutant:
Carbofuran
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Carbofuran.
The California Primary Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.018 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2015-04-23
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160454, Cadmium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333124
Pollutant:
Cadmium
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Cadmium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for cadmium is the probable effect concentration (PEC) of 4.98 mg/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Carbaryl
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160455, Carbaryl
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330908
Pollutant:
Carbaryl
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Carbaryl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA recommended water quality criterion for freshwater aquatic life for carbaryl is 2.1 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333011
Pollutant:
Chlordane
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333012
Pollutant:
Chlordane
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
DECISION ID
160456
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Carbofuran
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160456, Carbofuran
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330916
Pollutant:
Carbofuran
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Carbofuran.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The interim water quality criterion for the protection of sensitive aquatic organisms from Carbofuran is 0.5 ug/l (DFG 92-3, 1992).
Line of Evidence (LOE) for Decision ID 160456, Carbofuran
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330914
Pollutant:
Carbofuran
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Carbofuran.
The California Primary Maximum Contaminant Level for Carbofuran incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.018 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2015-04-23
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
DDING-TOP: 3px; font-smooth: always">Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333129
Pollutant:
Chlordane
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Chlordane .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for chlordane is the probable effect concentration (PEC) of 17.6 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309212
Pollutant:
Chlordane
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:
Zero of 1 sample collected exceeded the criteria for chlordane concentration (Sum of trans-Chlordane, cis-Chlordane, cis-Nonachlor, trans-Nonachlor, and Oxychlordane).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses. (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309262
Pollutant:
Chlordane
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for Chlordane .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Chlordane from MacDonald et al., 2000a which states that the probable effect concentration for Chlordane is 17.6 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chloride
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
LOEs for this waterbody-pollutant combination from previous cycles were reviewed, determined to be inaccurate, and removed and/or replaced.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166833, Chloride
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346271
Pollutant:
Chloride
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Chloride. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for chloride of 250-500 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532PS0667 (Cosumnes River ~0.5mi below Michigan Bar Rd.).
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chlorothalonil
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160458, Chlorothalonil
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330985
Pollutant:
Chlorothalonil
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chlorothalonil.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for chlorothalonil is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333011
Pollutant:
Chlordane
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chlordane criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0043 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333012
Pollutant:
Chlordane
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Total Chlordane. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333129
Pollutant:
Chlordane
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Chlordane .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for chlordane is the probable effect concentration (PEC) of 17.6 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309212
Pollutant:
Chlordane
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:
Zero of 1 sample collected exceeded the criteria for chlordane concentration (Sum of trans-Chlordane, cis-Chlordane, cis-Nonachlor, trans-Nonachlor, and Oxychlordane).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses. (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).
Line of Evidence (LOE) for Decision ID 160457, Chlordane
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309262
Pollutant:
Chlordane
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for Chlordane .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Chlordane from MacDonald et al., 2000a which states that the probable effect concentration for Chlordane is 17.6 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chlorpyrifos
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160459, Chlorpyrifos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330994
Pollutant:
Chlorpyrifos
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
14
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Chlorpyrifos.
The Basin Plan objective for Chlorpyrifos is 0.015 ug/L (4-day average).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-03-15 and 2019-08-21
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160459, Chlorpyrifos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309260
Pollutant:
Chlorpyrifos
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Chlorpyrifos. Although a total of 5 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for chlorpyrifos, 0.177 ug/g, is one-tenth of the median lethal concentration (LC50; 1.77 ug/g) and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).
Line of Evidence (LOE) for Decision ID 160459, Chlorpyrifos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309213
Pollutant:
Chlorpyrifos
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for chlorpyrifos, 0.177 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.77 ug/g OC). The LC50 (1.77 ug/g OC) is the geometric mean of OC-normalized LC50 values for chlorpyrifos from Amweg and Weston (2007).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chloride
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
LOEs for this waterbody-pollutant combination from previous cycles were reviewed, determined to be inaccurate, and removed and/or replaced.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166833, Chloride
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346271
Pollutant:
Chloride
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Chloride. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for chloride of 250-500 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532PS0667 (Cosumnes River ~0.5mi below Michigan Bar Rd.).
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chlorothalonil
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160458, Chlorothalonil
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330985
Pollutant:
Chlorothalonil
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Chlorothalonil.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for chlorothalonil is the USEPA Aquatic Life Benchmark of 0.6 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chromium
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160530, Chromium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309214
Pollutant:
Chromium
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Chromium.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160530, Chromium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333144
Pollutant:
Chromium
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Chromium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for chromium is the probable effect concentration (PEC) of 111 mg/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160530, Chromium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309265
Pollutant:
Chromium
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Chromium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Chromium from MacDonald et al., 2000a which states that the probable effect concentration for Chromium is 111 mg/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chlorpyrifos
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160459, Chlorpyrifos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330994
Pollutant:
Chlorpyrifos
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
14
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 14 samples exceeded the water quality threshold for Chlorpyrifos.
The Basin Plan objective for Chlorpyrifos is 0.015 ug/L (4-day average).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-03-15 and 2019-08-21
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160459, Chlorpyrifos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309260
Pollutant:
Chlorpyrifos
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Chlorpyrifos. Although a total of 5 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for chlorpyrifos, 0.177 ug/g, is one-tenth of the median lethal concentration (LC50; 1.77 ug/g) and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007).
Line of Evidence (LOE) for Decision ID 160459, Chlorpyrifos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309213
Pollutant:
Chlorpyrifos
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for chlorpyrifos, 0.177 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.77 ug/g OC). The LC50 (1.77 ug/g OC) is the geometric mean of OC-normalized LC50 values for chlorpyrifos from Amweg and Weston (2007).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chromium (total)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from two lines of evidence for this pollutant. None of the five available water sample results exceeded the water quality objective for the MUN beneficial use and the single sediment sample result does not exceed the evaluation guideline for the COLD beneficial use and, together, these results do not exceed the allowable frequency using Table 3.1 of the Listing Policy.
Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list.
The recommendation is based on staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the five available water sample results exceeded the water quality objective for the MUN beneficial use and the single sediment sample result does not exceed the evaluation guideline for the COLD beneficial use and, together, these results do not exceed the allowable frequency using Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152166, Chromium (total)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309186
Pollutant:
Chromium (total)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
0 of the 5 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Chromium.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Jun 24 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 152166, Chromium (total)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309214
Pollutant:
Chromium
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Chromium.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chromium
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160530, Chromium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309214
Pollutant:
Chromium
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Chromium.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160530, Chromium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333144
Pollutant:
Chromium
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Chromium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for chromium is the probable effect concentration (PEC) of 111 mg/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160530, Chromium
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309265
Pollutant:
Chromium
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Chromium .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Chromium from MacDonald et al., 2000a which states that the probable effect concentration for Chromium is 111 mg/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chromium (total)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from two lines of evidence for this pollutant. None of the five available water sample results exceeded the water quality objective for the MUN beneficial use and the single sediment sample result does not exceed the evaluation guideline for the COLD beneficial use and, together, these results do not exceed the allowable frequency using Table 3.1 of the Listing Policy.
Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list.
The recommendation is based on staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of the five available water sample results exceeded the water quality objective for the MUN beneficial use and the single sediment sample result does not exceed the evaluation guideline for the COLD beneficial use and, together, these results do not exceed the allowable frequency using Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152166, Chromium (total)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309186
Pollutant:
Chromium (total)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
0 of the 5 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Chromium.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Jun 24 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 152166, Chromium (total)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309214
Pollutant:
Chromium
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Chromium.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chrysene (C1-C4)
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152182, Chrysene (C1-C4)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309263
Pollutant:
Chrysene (C1-C4)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Chrysene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Chrysene (C1-C4)
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152182, Chrysene (C1-C4)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309263
Pollutant:
Chrysene (C1-C4)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Chrysene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Chrysene from MacDonald et al., 2000a which states that the probable effect concentration for Chrysene is 1290 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Clothianidin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160538, Clothianidin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331034
Pollutant:
Clothianidin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Clothianidin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for clothianidin is the USEPA Aquatic Life Benchmark of 0.05 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Clothianidin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160538, Clothianidin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331034
Pollutant:
Clothianidin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Clothianidin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for clothianidin is the USEPA Aquatic Life Benchmark of 0.05 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Copper
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331118
Pollutant:
Copper
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 13 samples exceeded the water quality threshold for Copper.
The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
345860
Pollutant:
Copper
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Copper.
The California Secondary Maximum Contaminant Level for copper incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 1.0 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-08-02 and 2006-03-16
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331102
Pollutant:
Copper
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
DECISION ID
160460
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Copper
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331118
Pollutant:
Copper
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 13 samples exceeded the water quality threshold for Copper.
The dissolved copper criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is hardness dependent. The criterion when calculated using a default hardness of 100 mg/L is 9 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
345860
Pollutant:
Copper
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Copper.
The California Secondary Maximum Contaminant Level for copper incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 1.0 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-08-02 and 2006-03-16
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331102
Pollutant:
Copper
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.
The California Secondary Maximum Contaminant Level for copper incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 1.0 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-10-18 and 2019-04-16
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333154
Pollutant:
Copper
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Copper .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for copper is the probable effect concentration (PEC) of 149 mg/kg dry weight (MacDonald et al., 2000a).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309264
Pollutant:
Copper
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Copper .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Copper from MacDonald et al., 2000a which states that the probable effect concentration for Copper is 149 mg/kg. (dw = Dry Weight)
n="left" valign="top" width="33%">Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Copper.
The California Secondary Maximum Contaminant Level for copper incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 1.0 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-10-18 and 2019-04-16
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333154
Pollutant:
Copper
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Copper .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for copper is the probable effect concentration (PEC) of 149 mg/kg dry weight (MacDonald et al., 2000a).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins).
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160460, Copper
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309264
Pollutant:
Copper
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Copper .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Copper from MacDonald et al., 2000a which states that the probable effect concentration for Copper is 149 mg/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cyfluthrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160527, Cyfluthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309217
Pollutant:
Cyfluthrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for cyfluthrin, 0.11 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.1 ug/g OC). The LC50 (1.1 ug/g OC) is the geometric mean of OC-normalized LC50 values for cyfluthrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160527, Cyfluthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331163
Pollutant:
Cyfluthrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cyfluthrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for cyfluthrin is 0.2 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cyfluthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160527, Cyfluthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309268
Pollutant:
Cyfluthrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Cyfluthrin, total. Although a total of 5 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for cyfluthrin, 0.11 ug/g, is one-tenth of the median lethal concentration (LC50; 1.1 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cyhalothrin, Lambda
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160529, Cyhalothrin, Lambda
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309269
Pollutant:
Cyhalothrin, Lambda
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cyhalothrin, Total lambda-. Although a total of 6 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
DECISION ID
160527
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cyfluthrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160527, Cyfluthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309217
Pollutant:
Cyfluthrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for cyfluthrin, 0.11 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.1 ug/g OC). The LC50 (1.1 ug/g OC) is the geometric mean of OC-normalized LC50 values for cyfluthrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160527, Cyfluthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331163
Pollutant:
Cyfluthrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cyfluthrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for cyfluthrin is 0.2 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of cyfluthrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160527, Cyfluthrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309268
Pollutant:
Cyfluthrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Cyfluthrin, total. Although a total of 5 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for cyfluthrin, 0.11 ug/g, is one-tenth of the median lethal concentration (LC50; 1.1 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005).
er_issues/programs/tmdl/records/region_5/2007/ref2434.zip" >Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
Evaluation Guideline:
The evaluation guideline for lambda-cyhalothrin, 0.044 ug/g, is one-tenth of the median lethal concentration (LC50; 0.44 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160529, Cyhalothrin, Lambda
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309218
Pollutant:
Cyhalothrin, Lambda
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for lambda-cyhalothrin, 0.044 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.44 ug/g OC). The LC50 (0.44 ug/g OC) is the geometric mean of OC-normalized LC50 values for lambda-cyhalothrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160529, Cyhalothrin, Lambda
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331696
Pollutant:
Cyhalothrin, Lambda
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lambda-cyhalothrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for lambda-cyhalothrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Lambda-cyhalothrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cyhalothrin, Lambda
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160529, Cyhalothrin, Lambda
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309269
Pollutant:
Cyhalothrin, Lambda
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Cyhalothrin, Total lambda-. Although a total of 6 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
DECISION ID
160511
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cypermethrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160511, Cypermethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331202
Pollutant:
Cypermethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed
Evaluation Guideline:
The evaluation guideline for lambda-cyhalothrin, 0.044 ug/g, is one-tenth of the median lethal concentration (LC50; 0.44 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160529, Cyhalothrin, Lambda
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309218
Pollutant:
Cyhalothrin, Lambda
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for lambda-cyhalothrin, 0.044 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.44 ug/g OC). The LC50 (0.44 ug/g OC) is the geometric mean of OC-normalized LC50 values for lambda-cyhalothrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160529, Cyhalothrin, Lambda
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331696
Pollutant:
Cyhalothrin, Lambda
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Lambda-cyhalothrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for lambda-cyhalothrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Lambda-cyhalothrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
The chronic concentration goal for cypermethrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Cypermethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160511, Cypermethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309353
Pollutant:
Cypermethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin, Total. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for cypermethrin, 0.03 ug/g, is one-tenth of the median lethal concentration (LC50; 0.3 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002).
Line of Evidence (LOE) for Decision ID 160511, Cypermethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309219
Pollutant:
Cypermethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for cypermethrin, 0.03 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.3 ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for cypermethrin from Maund et al. (2002).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cyprodinil
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160540, Cyprodinil
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331210
Pollutant:
Cyprodinil
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cyprodinil.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for cyprodinil is the USEPA Aquatic Life Benchmark of 8.2 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cypermethrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160511, Cypermethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331202
Pollutant:
Cypermethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for cypermethrin is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Cypermethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160511, Cypermethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309353
Pollutant:
Cypermethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Cypermethrin, Total. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for cypermethrin, 0.03 ug/g, is one-tenth of the median lethal concentration (LC50; 0.3 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002).
Line of Evidence (LOE) for Decision ID 160511, Cypermethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309219
Pollutant:
Cypermethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for cypermethrin, 0.03 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.3 ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for cypermethrin from Maund et al. (2002).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Cyprodinil
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160540, Cyprodinil
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331210
Pollutant:
Cyprodinil
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Cyprodinil.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for cyprodinil is the USEPA Aquatic Life Benchmark of 8.2 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 168393, DDD (Dichlorodiphenyldichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309266
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 168393, DDD (Dichlorodiphenyldichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333177
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for the sum of DDD is the probable effect concentration (PEC) of 28 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 168393, DDD (Dichlorodiphenyldichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331225
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDD (o,p' + p,p') is 28.0 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 168393, DDD (Dichlorodiphenyldichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309266
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Sum DDD from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDD is 28 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 168393, DDD (Dichlorodiphenyldichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333177
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDD (Dichlorodiphenyldichloroethane) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for the sum of DDD is the probable effect concentration (PEC) of 28 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 168393, DDD (Dichlorodiphenyldichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331225
Pollutant:
DDD (Dichlorodiphenyldichloroethane)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDD(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDD (o,p' + p,p') is 28.0 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309221
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
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:
The sample result did not exceed the evaluation guideline value (31.3 ug/Kg dry weight).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDE is 31.3 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309267
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333181
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331243
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDE(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309221
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
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:
The sample result did not exceed the evaluation guideline value (31.3 ug/Kg dry weight).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDE is 31.3 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309267
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333181
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for DDE (Dichlorodiphenyldichloroethylene) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Sum DDE from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDE is 31.3 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 168628, DDE (Dichlorodiphenyldichloroethylene)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331243
Pollutant:
DDE (Dichlorodiphenyldichloroethylene)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDE(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309222
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
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:
The sample result did not exceed the evaluation guideline value (62.9 ug/Kg dry weight).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDT is 62.9 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309290
Pollutant:
Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309270
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333182
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) .
Data Re
DECISION ID
169167
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309222
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
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:
The sample result did not exceed the evaluation guideline value (62.9 ug/Kg dry weight).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for the sum of DDT is 62.9 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309290
Pollutant:
Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Total DDTs from MacDonald et al., 2000a which states that the probable effect concentration for Total DDTs is 572 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for the sum of DDT is the probable effect concentration (PEC) of 62.9 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333269
Pollutant:
Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for total DDTs is the probable effect concentration (PEC) of 572 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331275
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The DDT(4,4') criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331279
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309270
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Sum DDT from MacDonald et al., 2000a which states that the probable effect concentration for Sum DDT is 62.9 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333182
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for DDT (Dichlorodiphenyltrichloroethane) .
Data Re
DECISION ID
160461
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dacthal
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160461, Dacthal
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331213
Pollutant:
Dacthal
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dacthal.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of >11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a greater-than value (for example, > 265,000) and may overestimate toxicity.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for the sum of DDT is the probable effect concentration (PEC) of 62.9 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333269
Pollutant:
Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for total DDTs is the probable effect concentration (PEC) of 572 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331275
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The DDT(4,4') criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.001 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 169167, DDT (Dichlorodiphenyltrichloroethane)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331279
Pollutant:
DDT (Dichlorodiphenyltrichloroethane)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for DDT(p,p'). Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dacthal
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160461, Dacthal
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331213
Pollutant:
Dacthal
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dacthal.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Dacthal is the USEPA Aquatic Life Benchmark of >11000 ug/L for a nonvascular plant (acute) and vascular plant (acute). The benchmark was derived from a greater-than value (for example, > 265,000) and may overestimate toxicity.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Deltamethrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160528, Deltamethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309223
Pollutant:
Deltamethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for deltamethrin, 0.079 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.79 ug/g OC). The LC50 (0.79 ug/g OC) is the geometric mean of OC-normalized LC50 values for deltamethrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160528, Deltamethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309352
Pollutant:
Deltamethrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 4 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for deltamethrin, 0.079 ug/g, is one-tenth of the median lethal concentration (LC50; 0.79 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160528, Deltamethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331316
Pollutant:
Deltamethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Deltamethrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160528, Deltamethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309223
Pollutant:
Deltamethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Demeton
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160532, Demeton
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331323
Pollutant:
Demeton
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Demeton, Total.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)
ine value for deltamethrin, 0.079 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 0.79 ug/g OC). The LC50 (0.79 ug/g OC) is the geometric mean of OC-normalized LC50 values for deltamethrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160528, Deltamethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309352
Pollutant:
Deltamethrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 4 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for deltamethrin, 0.079 ug/g, is one-tenth of the median lethal concentration (LC50; 0.79 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160528, Deltamethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331316
Pollutant:
Deltamethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Deltamethrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for deltamethrin is the USEPA Aquatic Life Benchmark of 0.000026 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Demeton
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160532, Demeton
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331323
Pollutant:
Demeton
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Demeton, Total.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA National Recommended Water Quality criterion for demeton for freshwater aquatic life protection is 0.1 ug/l (4 day average)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Diazinon
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160463, Diazinon
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309272
Pollutant:
Diazinon
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Diazinon. Although a total of 5 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for diazinon, 1.1 ug/g, is one-tenth of the median lethal concentration for H. azteca(LC50; 11 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 11 ug/g is the geometric mean of LC50 values for diazinon from Ding et al. (2011).
Line of Evidence (LOE) for Decision ID 160463, Diazinon
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309224
Pollutant:
Diazinon
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was below both the reporting limit (5 ng/g dry weight) and the organic carbon-normalized evaluation guideline value (1.1 ug/g OC) and could not be quantified with the level of certainty required by the listing policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for diazinon, 1.1 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 11 ug/g OC). The LC50 (11 ug/g OC) is the geometric mean of OC-normalized LC50 values for diazinon (Ding et al. 2011).
Line of Evidence (LOE) for Decision ID 160463, Diazinon
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330995
Pollutant:
Diazinon
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Diazinon.
The Basin Plan objective for Diazinon is 0.10 ug/L (4-day average).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-03-15 and 2018-05-15
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dichlorvos
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160464, Dichlorvos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331407
Pollutant:
Dichlorvos
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 11 samples were collected, 11 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Diazinon
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160463, Diazinon
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309272
Pollutant:
Diazinon
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Diazinon. Although a total of 5 samples were collected, 2 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for diazinon, 1.1 ug/g, is one-tenth of the median lethal concentration for H. azteca(LC50; 11 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 11 ug/g is the geometric mean of LC50 values for diazinon from Ding et al. (2011).
Line of Evidence (LOE) for Decision ID 160463, Diazinon
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309224
Pollutant:
Diazinon
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was below both the reporting limit (5 ng/g dry weight) and the organic carbon-normalized evaluation guideline value (1.1 ug/g OC) and could not be quantified with the level of certainty required by the listing policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for diazinon, 1.1 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 11 ug/g OC). The LC50 (11 ug/g OC) is the geometric mean of OC-normalized LC50 values for diazinon (Ding et al. 2011).
Line of Evidence (LOE) for Decision ID 160463, Diazinon
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
330995
Pollutant:
Diazinon
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Diazinon.
The Basin Plan objective for Diazinon is 0.10 ug/L (4-day average).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-03-15 and 2018-05-15
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dicofol
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160465, Dicofol
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331412
Pollutant:
Dicofol
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dicofol.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dicofol is the USEPA Aquatic Life Benchmark of 4.4 ug/L for a fish (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dichlorvos
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160464, Dichlorvos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331407
Pollutant:
Dichlorvos
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dichlorvos. Although a total of 11 samples were collected, 11 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dichlorvos is the USEPA Aquatic Life Benchmark of 0.0058 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dicofol
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160465, Dicofol
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331412
Pollutant:
Dicofol
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Dicofol.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dicofol is the USEPA Aquatic Life Benchmark of 4.4 ug/L for a fish (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160466, Dieldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309275
Pollutant:
Dieldrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Dieldrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160466, Dieldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309275
Pollutant:
Dieldrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Dieldrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331413
Pollutant:
Dieldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Dieldrin.
The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160466, Dieldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331414
Pollutant:
Dieldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160466, Dieldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333192
Pollutant:
Dieldrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Dieldrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dieldrin is the probable effect concentration (PEC) of 61.8 ug/kg dry weight (MacDonald et al., 2000a).
ign="top" width="67%">The evaluation guideline for Dieldrin from MacDonald et al., 2000a which states that the probable effect concentration for Dieldrin is 61.8 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Diflubenzuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160541, Diflubenzuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331425
Pollutant:
Diflubenzuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Diflubenzuron. Although a total of 12 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for diflubenzuron is the USEPA Aquatic Life Benchmark of 0.00025 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331413
Pollutant:
Dieldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Dieldrin.
The dieldrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.056 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160466, Dieldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331414
Pollutant:
Dieldrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Dieldrin. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160466, Dieldrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333192
Pollutant:
Dieldrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Dieldrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dieldrin is the probable effect concentration (PEC) of 61.8 ug/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dimethoate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160513, Dimethoate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331429
Pollutant:
Dimethoate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Dimethoate.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Diflubenzuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160541, Diflubenzuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331425
Pollutant:
Diflubenzuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Diflubenzuron. Although a total of 12 samples were collected, 12 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for diflubenzuron is the USEPA Aquatic Life Benchmark of 0.00025 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Disulfoton
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160467, Disulfoton
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331447
Pollutant:
Disulfoton
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Disulfoton.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Dimethoate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160513, Dimethoate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331429
Pollutant:
Dimethoate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Dimethoate.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for dimethoate is the USEPA Aquatic Life Benchmark of 0.5 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Diuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160468, Diuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331457
Pollutant:
Diuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Diuron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Disulfoton
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160467, Disulfoton
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331447
Pollutant:
Disulfoton
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Disulfoton.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for disulfoton is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Diuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160468, Diuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331457
Pollutant:
Diuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Diuron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Aquatic life should not be affected unacceptably if the 4-day average concentration of diuron does not exceed 1.3 ug/L (UC Davis Aquatic Life Criteria).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Endosulfan sulfate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160469, Endosulfan sulfate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331477
Pollutant:
Endosulfan sulfate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan Sulfate.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)
Line of Evidence (LOE) for Decision ID 160469, Endosulfan sulfate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331479
Pollutant:
Endosulfan sulfate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan Sulfate.
The endosulfan sulfate criterion for the protection of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Endosulfan sulfate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160469, Endosulfan sulfate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331477
Pollutant:
Endosulfan sulfate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan Sulfate.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA National Recommended Water Quality Criteria toxicity threshold for endosulfan sulfate for freshwater aquatic life protection is 0.056 ug/l (24 hour average)
Line of Evidence (LOE) for Decision ID 160469, Endosulfan sulfate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331479
Pollutant:
Endosulfan sulfate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan Sulfate.
The endosulfan sulfate criterion for the protection of human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331482
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endrin.
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333195
Pollutant:
Endrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Endrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for endrin is the probable effect concentration (PEC) of 207 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309227
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Sediment
DECISION ID
160470
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331482
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309271
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Endrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331484
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endrin.
The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.036 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333195
Pollutant:
Endrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Endrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for endrin is the probable effect concentration (PEC) of 207 ug/kg dry weight (MacDonald et al., 2000a).
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309227
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Sediment
DECISION ID
160471
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Endrin aldehyde
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160471, Endrin aldehyde
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331486
Pollutant:
Endrin aldehyde
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endrin Aldehyde.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309271
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Endrin .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Endrin from MacDonald et al., 2000a which states that the probable effect concentration for Endrin is 207 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160470, Endrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331484
Pollutant:
Endrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endrin.
The endrin criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.036 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Endrin aldehyde
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160471, Endrin aldehyde
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331486
Pollutant:
Endrin aldehyde
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endrin Aldehyde.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Esfenvalerate/Fenvalerate
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160533, Esfenvalerate/Fenvalerate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309229
Pollutant:
Esfenvalerate/Fenvalerate
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was below both the reporting limit (1 ng/g dry weight) and the organic carbon-normalized evaluation guideline value (0.15 ug/g OC) and could not be quantified with the level of certainty required by the listing policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for esfenvalerate/fenvalerate, 0.15 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.5 ug/g OC). The LC50 (1.5 ug/g OC) is the geometric mean of OC-normalized LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160533, Esfenvalerate/Fenvalerate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309274
Pollutant:
Esfenvalerate/Fenvalerate
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Esfenvalerate/Fenvalerate, Total. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for esfenvalerate/fenvalerate, 0.15 ug/g, is one-tenth of the median lethal concentration (LC50; 1.5 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160533, Esfenvalerate/Fenvalerate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331523
Pollutant:
Esfenvalerate/Fenvalerate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Esfenvalerate. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for esfenvalerate is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Esfenvalerate were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Ethoprop
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160515, Ethoprop
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331540
Pollutant:
Ethoprop
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Ethoprop.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Esfenvalerate/Fenvalerate
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160533, Esfenvalerate/Fenvalerate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309229
Pollutant:
Esfenvalerate/Fenvalerate
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was below both the reporting limit (1 ng/g dry weight) and the organic carbon-normalized evaluation guideline value (0.15 ug/g OC) and could not be quantified with the level of certainty required by the listing policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for esfenvalerate/fenvalerate, 0.15 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 1.5 ug/g OC). The LC50 (1.5 ug/g OC) is the geometric mean of OC-normalized LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160533, Esfenvalerate/Fenvalerate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309274
Pollutant:
Esfenvalerate/Fenvalerate
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Esfenvalerate/Fenvalerate, Total. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for esfenvalerate/fenvalerate, 0.15 ug/g, is one-tenth of the median lethal concentration (LC50; 1.5 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160533, Esfenvalerate/Fenvalerate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331523
Pollutant:
Esfenvalerate/Fenvalerate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Esfenvalerate. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for esfenvalerate is 0.3 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Esfenvalerate were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fenpropathrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160531, Fenpropathrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309230
Pollutant:
Fenpropathrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for fenpropathrin, 0.1 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; one ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for fenpropathrin (Ding et al. 2011).
Line of Evidence (LOE) for Decision ID 160531, Fenpropathrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309273
Pollutant:
Fenpropathrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Fenpropathrin. Although a total of 5 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for fenpropathrin, 0.1 ug/g, is one-tenth of the median lethal concentration (LC50; 1 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011).
Line of Evidence (LOE) for Decision ID 160531, Fenpropathrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331559
Pollutant:
Fenpropathrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Fenpropathrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Ethoprop
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160515, Ethoprop
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331540
Pollutant:
Ethoprop
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Ethoprop.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for ethoprop is the USEPA Aquatic Life Benchmark of 0.8 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fenthion
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160523, Fenthion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331576
Pollutant:
Fenthion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Fenthion.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Flumioxazin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160542, Flumioxazin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331577
Pollutant:
Flumioxazin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Flumioxazin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for flumioxazin is the USEPA Aquatic Life Benchmark of 0.49 ug/L for a vascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fluometuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160472, Fluometuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331578
Pollutant:
Fluometuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Fluometuron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for floumeturon is the USEPA Aquatic Life Benchmark of 30 ug/L for nonvascular plants.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fenpropathrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160531, Fenpropathrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309230
Pollutant:
Fenpropathrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for fenpropathrin, 0.1 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; one ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for fenpropathrin (Ding et al. 2011).
Line of Evidence (LOE) for Decision ID 160531, Fenpropathrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309273
Pollutant:
Fenpropathrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the evaluation guideline for Fenpropathrin. Although a total of 5 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for fenpropathrin, 0.1 ug/g, is one-tenth of the median lethal concentration (LC50; 1 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011).
Line of Evidence (LOE) for Decision ID 160531, Fenpropathrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331559
Pollutant:
Fenpropathrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Fenpropathrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for Fenpropathrin is the USEPA Aquatic Life Benchmark of 0.0015 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fenthion
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160523, Fenthion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331576
Pollutant:
Fenthion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Fenthion.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for fenthion is the USEPA Aquatic Life Benchmark of 0.013 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fluoranthene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152196, Fluoranthene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309231
Pollutant:
Fluoranthene
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Fluoranthene.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Fluoranthene is 2,230 ug/Kg dry weight (Macdonald et al. 2000).
Line of Evidence (LOE) for Decision ID 152196, Fluoranthene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309278
Pollutant:
Fluoranthene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Fluoranthene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Fluoranthene from MacDonald et al., 2000a which states that the probable effect concentration for Fluoranthene is 2230 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Flumioxazin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160542, Flumioxazin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331577
Pollutant:
Flumioxazin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Flumioxazin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for flumioxazin is the USEPA Aquatic Life Benchmark of 0.49 ug/L for a vascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fluometuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160472, Fluometuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331578
Pollutant:
Fluometuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Fluometuron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for floumeturon is the USEPA Aquatic Life Benchmark of 30 ug/L for nonvascular plants.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fluorene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152197, Fluorene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309232
Pollutant:
Fluorene
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Fluorene.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for fluorene is 536 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 152197, Fluorene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309283
Pollutant:
Fluorene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Fluorene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Fluorene from MacDonald et al., 2000a which states that the probable effect concentration for Fluorene is 536 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fluoranthene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152196, Fluoranthene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309231
Pollutant:
Fluoranthene
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Fluoranthene.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Fluoranthene is 2,230 ug/Kg dry weight (Macdonald et al. 2000).
Line of Evidence (LOE) for Decision ID 152196, Fluoranthene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309278
Pollutant:
Fluoranthene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Fluoranthene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Fluoranthene from MacDonald et al., 2000a which states that the probable effect concentration for Fluoranthene is 2230 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Heptachlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160474, Heptachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331620
Pollutant:
Heptachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160474, Heptachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331621
Pollutant:
Heptachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The heptachlor criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Fluorene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152197, Fluorene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309232
Pollutant:
Fluorene
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Fluorene.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for fluorene is 536 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 152197, Fluorene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309283
Pollutant:
Fluorene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Fluorene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Fluorene from MacDonald et al., 2000a which states that the probable effect concentration for Fluorene is 536 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Heptachlor epoxide
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160475, Heptachlor epoxide
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331624
Pollutant:
Heptachlor epoxide
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The heptachlor epoxide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160475, Heptachlor epoxide
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331625
Pollutant:
Heptachlor epoxide
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The heptachlor epoxide criterion for the protection of human health from the consumption of water and organisms is 0.0001 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexachlorobenzene/ HCB
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160476, Hexachlorobenzene/ HCB
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331626
Pollutant:
Hexachlorobenzene/ HCB
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The hexachlorobenzene criterion for the protection of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Heptachlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160474, Heptachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331620
Pollutant:
Heptachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160474, Heptachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331621
Pollutant:
Heptachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The heptachlor criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexachlorocyclohexane (HCH), alpha
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160526, Hexachlorocyclohexane (HCH), alpha
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331609
Pollutant:
Hexachlorocyclohexane (HCH), alpha
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for HCH, alpha-. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The alpha-HCH (alpha-BHC) criteria for the protection of human health from consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexachlorocyclohexane (HCH), beta
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160525, Hexachlorocyclohexane (HCH), beta
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331612
Pollutant:
Hexachlorocyclohexane (HCH), beta
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for HCH, beta-.
The beta-HCH (beta-BHC) criterion for the protection of human health from consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Heptachlor epoxide
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160475, Heptachlor epoxide
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331624
Pollutant:
Heptachlor epoxide
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The heptachlor epoxide criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0038 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160475, Heptachlor epoxide
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331625
Pollutant:
Heptachlor epoxide
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Heptachlor Epoxide. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The heptachlor epoxide criterion for the protection of human health from the consumption of water and organisms is 0.0001 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexazinone
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160534, Hexazinone
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331630
Pollutant:
Hexazinone
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Hexazinone.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for hexazinone is the USEPA Aquatic Life Benchmark of 7 ug/L for a nonvascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexachlorobenzene/ HCB
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160476, Hexachlorobenzene/ HCB
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331626
Pollutant:
Hexachlorobenzene/ HCB
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Hexachlorobenzene. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The hexachlorobenzene criterion for the protection of human health from the consumption of water and organisms is 0.00075 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Imidacloprid
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160504, Imidacloprid
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331651
Pollutant:
Imidacloprid
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Imidacloprid.
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.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the 4-day average concentration of imidacloprid does not exceed 0.016 ug/L.
Guidel
DECISION ID
160526
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexachlorocyclohexane (HCH), alpha
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160526, Hexachlorocyclohexane (HCH), alpha
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331609
Pollutant:
Hexachlorocyclohexane (HCH), alpha
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for HCH, alpha-. Although a total of 6 samples were collected, 6 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The alpha-HCH (alpha-BHC) criteria for the protection of human health from consumption of water and organisms is 0.0039 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexachlorocyclohexane (HCH), beta
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160525, Hexachlorocyclohexane (HCH), beta
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331612
Pollutant:
Hexachlorocyclohexane (HCH), beta
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for HCH, beta-.
The beta-HCH (beta-BHC) criterion for the protection of human health from consumption of water and organisms is 0.014 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Hexazinone
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160534, Hexazinone
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331630
Pollutant:
Hexazinone
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Hexazinone.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for hexazinone is the USEPA Aquatic Life Benchmark of 7 ug/L for a nonvascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Imidacloprid
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160504, Imidacloprid
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331651
Pollutant:
Imidacloprid
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Imidacloprid.
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.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the 4-day average concentration of imidacloprid does not exceed 0.016 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Lead
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309190
Pollutant:
Lead
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Warm Freshwater Habitat
Aquatic Life Use:
Warm Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
4 samples were taken from Cosumnes River between June 2005 and August of 2006. Zero of the 4 samples exceeds guidelines for dissolved lead.
California Toxics Rule Criteria (USEPA) - Freshwater Aquatic Life ProtectionContinuous Concentration (4-day Average) calculated based on the following formula: (e(1.273xLN(hardness))-4.705)x((1.46203-LN(hardness))x0.145712)U.S. Environmental Protection Agency, Federal Register, Volume 65, No. 97 (Thursday, 18 May 2000), pp. 31682-31719 [California Toxics Rule]; and Federal Register, Volume 66, No. 30 (Tuesday, 13 February 2001), pp. 9960-9962 [California Toxics Rule Correction] http://www.gpoaccess.gov/fr/browse.html.
Samples were collected from Cosumnes River at Twin Cities Rd.
Temporal Representation:
Samples were collected from June 2005 and August of 2006. Samples were collected at monthly intervals.
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number R5-2003-0826) requirements (CVRWQCB, 2003)
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309233
Pollutant:
Lead
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Lead.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309279
Pollutant:
Lead
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Lead .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Lead from MacDonald et al., 2000a which states that the probable effect concentration for Lead is 128 mg/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333220
Pollutant:
Lead
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Lead .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for lead is the probable effect concentration (PEC) of 128 mg/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Lead
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309190
Pollutant:
Lead
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Warm Freshwater Habitat
Aquatic Life Use:
Warm Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
4 samples were taken from Cosumnes River between June 2005 and August of 2006. Zero of the 4 samples exceeds guidelines for dissolved lead.
California Toxics Rule Criteria (USEPA) - Freshwater Aquatic Life ProtectionContinuous Concentration (4-day Average) calculated based on the following formula: (e(1.273xLN(hardness))-4.705)x((1.46203-LN(hardness))x0.145712)U.S. Environmental Protection Agency, Federal Register, Volume 65, No. 97 (Thursday, 18 May 2000), pp. 31682-31719 [California Toxics Rule]; and Federal Register, Volume 66, No. 30 (Tuesday, 13 February 2001), pp. 9960-9962 [California Toxics Rule Correction] http://www.gpoaccess.gov/fr/browse.html.
Samples were collected from Cosumnes River at Twin Cities Rd.
Temporal Representation:
Samples were collected from June 2005 and August of 2006. Samples were collected at monthly intervals.
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number R5-2003-0826) requirements (CVRWQCB, 2003)
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309233
Pollutant:
Lead
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Warm Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Lead.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309279
Pollutant:
Lead
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Lead .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Lead from MacDonald et al., 2000a which states that the probable effect concentration for Lead is 128 mg/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160477, Lead
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333220
Pollutant:
Lead
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Lead .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for lead is the probable effect concentration (PEC) of 128 mg/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309234
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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:
One sediment sample was collected and analyzed for the SWAMP.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309284
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for HCH, gamma-. Although a total of 5 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Lindane from MacDonald et al., 2000a which states that the probable effect concentration for Lindane is 4.99 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309234
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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:
One sediment sample was collected and analyzed for the SWAMP.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for Lindane (gamma-HCH) is 4.99 ug/Ksion ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331617
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for HCH, gamma-.
The gamma-BHC (Lindane, gamma-HCH) criterion for the protection of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331615
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for HCH, gamma-.
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309284
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 2 samples exceeded the evaluation guideline for HCH, gamma-. Although a total of 5 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for Lindane from MacDonald et al., 2000a which states that the probable effect concentration for Lindane is 4.99 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331617
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for HCH, gamma-.
The gamma-BHC (Lindane, gamma-HCH) criterion for the protection of human health from the consumption of water and organisms is 0.019 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160478, Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331615
Pollutant:
Lindane/gamma Hexachlorocyclohexane (gamma-HCH)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for HCH, gamma-.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Linuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160479, Linuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331743
Pollutant:
Linuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Linuron. Although a total of 11 samples were collected, 11 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Linuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160479, Linuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331743
Pollutant:
Linuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Linuron. Although a total of 11 samples were collected, 11 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for linuron is the USEPA Aquatic Life Benchmark of 0.09 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Malathion
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160480, Malathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331762
Pollutant:
Malathion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the water quality threshold for Malathion. Although a total of 15 samples were collected, 5 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Aquatic life should not be affected unacceptably if the 4-day average concentration of malathion does not exceed 0.028 ug/L (UC Davis Aquatic Life Criteria).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Malathion
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160480, Malathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331762
Pollutant:
Malathion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 10 samples exceeded the water quality threshold for Malathion. Although a total of 15 samples were collected, 5 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Aquatic life should not be affected unacceptably if the 4-day average concentration of malathion does not exceed 0.028 ug/L (UC Davis Aquatic Life Criteria).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methamidophos
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160448, Methamidophos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331791
Pollutant:
Methamidophos
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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methamidophos.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for methamidophos is the USEPA Aquatic Life Benchmark of 4.5 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methamidophos
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160448, Methamidophos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331791
Pollutant:
Methamidophos
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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Methamidophos.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for methamidophos is the USEPA Aquatic Life Benchmark of 4.5 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methidathion
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160512, Methidathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331794
Pollutant:
Methidathion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Methidathion.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methidathion
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160512, Methidathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331794
Pollutant:
Methidathion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Methidathion.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for methidathion is the USEPA Aquatic Life Benchmark of 0.66 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methiocarb
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160505, Methiocarb
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331800
Pollutant:
Methiocarb
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methiocarb.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methiocarb
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160505, Methiocarb
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331800
Pollutant:
Methiocarb
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 11 samples exceeded the water quality threshold for Methiocarb.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for methiocarb is the USEPA Aquatic Life Benchmark of 2.75 ug/L for an invertebrate (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methomyl
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160506, Methomyl
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331805
Pollutant:
Methomyl
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Methomyl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The Basin Plan states: Where valid testing has developed 96-hour LC50 values for aquatic organisms..., the Board will consider one tenth of this value for the most sensitive species tested as the upper limit (daily maximum) for the protection of aquatic life... or [O]ther available information on the pesticide... The criteria continuous concentration for Methomyl is 0.5 ug/L (4-day average). (CDFG, 1996)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methomyl
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160506, Methomyl
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331805
Pollutant:
Methomyl
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Methomyl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The Basin Plan states: Where valid testing has developed 96-hour LC50 values for aquatic organisms..., the Board will consider one tenth of this value for the most sensitive species tested as the upper limit (daily maximum) for the protection of aquatic life... or [O]ther available information on the pesticide... The criteria continuous concentration for Methomyl is 0.5 ug/L (4-day average). (CDFG, 1996)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methoxychlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160481, Methoxychlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331815
Pollutant:
Methoxychlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Methoxychlor.
The California Primary Maximum Contaminant Level for Methoxychlor incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.03 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2015-04-23
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160481, Methoxychlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331813
Pollutant:
Methoxychlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Methoxychlor.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methoxychlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160481, Methoxychlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331815
Pollutant:
Methoxychlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Methoxychlor.
The California Primary Maximum Contaminant Level for Methoxychlor incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.03 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2015-04-23
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160481, Methoxychlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331813
Pollutant:
Methoxychlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Methoxychlor.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA national ambient water quality criterion for freshwater aquatic life Criterion Continuous Concentration (CCC) expressed as a 4-day average for methoxychlor is 0.03 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methyl Parathion
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160482, Methyl Parathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332293
Pollutant:
Methyl Parathion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Parathion, Methyl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The California Department of Fish and Game instantaneous aquatic life criterion for methyl parathion is 0.08 ug/L.
Line of Evidence (LOE) for Decision ID 160482, Methyl Parathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309236
Pollutant:
Methyl Parathion
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was below the reporting limit (10 ng/g dry weight) yet the organic carbon-normalized reporting limit exceeds the evaluation guideline value (0.6 ug/g OC). Therefore, the sample result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for methyl parathion, 0.6 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 6 ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for methyl parathion (Ding et al. 2011).
Line of Evidence (LOE) for Decision ID 160482, Methyl Parathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309286
Pollutant:
Methyl Parathion
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for Parathion, Methyl .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for methyl parathion, 0.6 ug/g, is one-tenth of the median lethal concentration (LC50; 6 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 6 ug/g is the geometric mean of LC50 values for methyl parathion from Ding et al. (2011).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Methyl Parathion
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160482, Methyl Parathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332293
Pollutant:
Methyl Parathion
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Parathion, Methyl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The California Department of Fish and Game instantaneous aquatic life criterion for methyl parathion is 0.08 ug/L.
Line of Evidence (LOE) for Decision ID 160482, Methyl Parathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309236
Pollutant:
Methyl Parathion
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was below the reporting limit (10 ng/g dry weight) yet the organic carbon-normalized reporting limit exceeds the evaluation guideline value (0.6 ug/g OC). Therefore, the sample result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for methyl parathion, 0.6 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 6 ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for methyl parathion (Ding et al. 2011).
Line of Evidence (LOE) for Decision ID 160482, Methyl Parathion
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309286
Pollutant:
Methyl Parathion
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for Parathion, Methyl .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for methyl parathion, 0.6 ug/g, is one-tenth of the median lethal concentration (LC50; 6 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 6 ug/g is the geometric mean of LC50 values for methyl parathion from Ding et al. (2011).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Metolachlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160516, Metolachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331816
Pollutant:
Metolachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Metolachlor.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for metolachlor is the USEPA Aquatic Life Benchmark of 8 ug/L for nonvascular plants.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Metolachlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160516, Metolachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331816
Pollutant:
Metolachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for Metolachlor.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for metolachlor is the USEPA Aquatic Life Benchmark of 8 ug/L for nonvascular plants.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Mirex
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160483, Mirex
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331817
Pollutant:
Mirex
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Mirex. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA national recommended criterion continuous concentration for mirex for the protection of freshwater aquatic life is 0.001 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Mirex
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160483, Mirex
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331817
Pollutant:
Mirex
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Mirex. Although a total of 4 samples were collected, 4 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The USEPA national recommended criterion continuous concentration for mirex for the protection of freshwater aquatic life is 0.001 ug/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Molybdenum
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160484, Molybdenum
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331827
Pollutant:
Molybdenum
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Agricultural Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Molybdenum.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Molybdenum
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160484, Molybdenum
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331827
Pollutant:
Molybdenum
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Agricultural Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Molybdenum.
Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Water Quality for Agriculture, published by the Food and Agriculture Organization of the United Nations in 1985, contains criteria protective of various agricultural uses of water. These criteria were used to translate narrative water quality objectives for chemical constituents that prohibit chemicals in concentrations that would impair agricultural uses of water. The recommended maximum concentration of molybdenum in irrigation water is 0.01 mg/L.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Monuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160536, Monuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331832
Pollutant:
Monuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Monuron.
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.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The Basin Plan states: Where valid testing has developed 96-hour LC50 values for aquatic organisms..., the Board will consider one tenth of this value for the most sensitive species tested as the upper limit (daily maximum) for the protection of aquatic life... or [O]ther available information on the pesticide... The evaluation guideline for monuron, 330 ug/L, is one-tenth of the median lethal concentration (LC50 = 3,300 ug/L) for Lepomis gibbosus (Pumpkinseed sunfish). (USEPA Office of Pesticide Programs Ecotoxicity database)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Monuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160536, Monuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331832
Pollutant:
Monuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Monuron.
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.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The Basin Plan states: Where valid testing has developed 96-hour LC50 values for aquatic organisms..., the Board will consider one tenth of this value for the most sensitive species tested as the upper limit (daily maximum) for the protection of aquatic life... or [O]ther available information on the pesticide... The evaluation guideline for monuron, 330 ug/L, is one-tenth of the median lethal concentration (LC50 = 3,300 ug/L) for Lepomis gibbosus (Pumpkinseed sunfish). (USEPA Office of Pesticide Programs Ecotoxicity database)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Naled
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160522, Naled
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331833
Pollutant:
Naled
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Naled. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for naled is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Naled
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160522, Naled
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331833
Pollutant:
Naled
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Naled. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for naled is the USEPA Aquatic Life Benchmark of 0.01 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Naphthalene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152201, Naphthalene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309237
Pollutant:
Naphthalene
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Naphthalene.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for naphthalene is 561 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 152201, Naphthalene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309276
Pollutant:
Naphthalene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Naphthalene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Naphthalene from MacDonald et al., 2000a which states that the probable effect concentration for Naphthalene is 561 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Naphthalene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152201, Naphthalene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309237
Pollutant:
Naphthalene
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Naphthalene.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for naphthalene is 561 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 152201, Naphthalene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309276
Pollutant:
Naphthalene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Naphthalene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Naphthalene from MacDonald et al., 2000a which states that the probable effect concentration for Naphthalene is 561 ug/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nickel
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Six lines of evidence are available in the administrative record to assess this pollutant. Three of the nine sediment samples exceed the evaluation guideline for COLD. Zero of the exceeding sediment samples exhibited associated sediment toxicity. Additionally, zero of eight water samples, reported as dissolved concentration, exceed the evaluation guideline for COLD and zero of five water samples, reported as total concentration, exceed the objective for MUN.
Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for 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. Three of the nine sediment samples exceed the evaluation guideline for COLD and this sample size is sufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is no associated sediment toxicity as required by Section 3.6 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 although this water body exceeds the guideline for sediment chemistry, this water body-pollutant combination should not be placed on the section 303(d) list because there is no associated evidence of sediment toxicity as required by the Listing Policy.
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 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309238
Pollutant:
Nickel
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Nickel.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309280
Pollutant:
Nickel
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 3 of the 7 samples exceeded the evaluation guideline for Nickel .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Nickel from MacDonald et al., 2000a which states that the probable effect concentration for Nickel is 48.6 mg/kg. (dw = Dry Weight)
Data were collected from 1 station(s). Station Code(s): 531SAC001.
Temporal Representation:
Data for this waterbody were collected over the date range 2010-09-01 to 2018-07-10
Environmental Conditions:
QAPP Information:
SWAMP QAPrP 2008
QAPP Information
DECISION ID
160485
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nickel
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Six lines of evidence are available in the administrative record to assess this pollutant. Three of the nine sediment samples exceed the evaluation guideline for COLD. Zero of the exceeding sediment samples exhibited associated sediment toxicity. Additionally, zero of eight water samples, reported as dissolved concentration, exceed the evaluation guideline for COLD and zero of five water samples, reported as total concentration, exceed the objective for MUN.
Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for 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. Three of the nine sediment samples exceed the evaluation guideline for COLD and this sample size is sufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is no associated sediment toxicity as required by Section 3.6 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 although this water body exceeds the guideline for sediment chemistry, this water body-pollutant combination should not be placed on the section 303(d) list because there is no associated evidence of sediment toxicity as required by the Listing Policy.
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 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309238
Pollutant:
Nickel
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:
SWAMP data indicates that 0 of the sample results exceed the evaluation guideline value for Nickel.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309280
Pollutant:
Nickel
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 3 of the 7 samples exceeded the evaluation guideline for Nickel .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Nickel from MacDonald et al., 2000a which states that the probable effect concentration for Nickel is 48.6 mg/kg. (dw = Dry Weight)
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between October 24, 2000 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309176
Pollutant:
Nickel
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Zero of the 8 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CTR CMC for dissolved nickel
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between October 24, 2000 and June 24, 2003
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309176
Pollutant:
Nickel
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Zero of the 8 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CTR CMC for dissolved nickel
Dissolved nickel levels should not exceed the calculated CTR limit based on the formula: Criteria Maximum Concentration (1-hour Average, dissolved)=(EXP(0.846*LN(hardness)+2.255))*(0.998)
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between November 28, 2000, and November 27, 2001
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309254
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 8 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333238
Pollutant:
Nickel
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Nickel .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for nickel is the probable effect concentration (PEC) of 48.6 mg/kg dry weight (MacDonald et al., 2000a).
gn="top" width="67%">Dissolved nickel levels should not exceed the calculated CTR limit based on the formula: Criteria Maximum Concentration (1-hour Average, dissolved)=(EXP(0.846*LN(hardness)+2.255))*(0.998)
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between November 28, 2000, and November 27, 2001
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309254
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 8 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day, at the same location with the same lab sample ID (if provided). The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca, for Growth (wt/surv indiv), Hyalella azteca, for Survival
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. Region 5 Basin Plan.
Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold.
Line of Evidence (LOE) for Decision ID 160485, Nickel
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333238
Pollutant:
Nickel
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Nickel .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for nickel is the probable effect concentration (PEC) of 48.6 mg/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrate as Nitrate (NO3)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from three lines of evidence for this pollutant.
Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list.
The recommendation is based on staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of 11 available water sample results exceeded the evaluation guideline for the Cold Freshwater Habitat (COLD) beneficial use and none of twelve available water samples exceeded the water quality objective for the Municipal and Domestic Supply (MUN) beneficial use, and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is sufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152161, Nitrate as Nitrate (NO3)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309177
Pollutant:
Nitrate as Nitrate (NO3)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Zero of the 11 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Nitrate-N.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Jun 25 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 152161, Nitrate as Nitrate (NO3)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309183
Pollutant:
Nitrate as Nitrate (NO3)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
0 of the 11 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Nitrate-N.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Jun 25 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 152161, Nitrate as Nitrate (NO3)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309240
Pollutant:
Nitrogen, Nitrate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrate as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected on a single day 1/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrate as Nitrate (NO3)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from three lines of evidence for this pollutant.
Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list.
The recommendation is based on staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. None of 11 available water sample results exceeded the evaluation guideline for the Cold Freshwater Habitat (COLD) beneficial use and none of twelve available water samples exceeded the water quality objective for the Municipal and Domestic Supply (MUN) beneficial use, and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is sufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152161, Nitrate as Nitrate (NO3)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309177
Pollutant:
Nitrate as Nitrate (NO3)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Zero of the 11 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Nitrate-N.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Jun 25 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 152161, Nitrate as Nitrate (NO3)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309183
Pollutant:
Nitrate as Nitrate (NO3)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
11
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
0 of the 11 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Nitrate-N.
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. (CRWQCB, 2006)
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Jun 25 2002
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 152161, Nitrate as Nitrate (NO3)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309240
Pollutant:
Nitrogen, Nitrate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrate as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected on a single day 1/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160486, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309239
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Nitrate/Nitrite as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected over the time period 2/16/2009-6/18/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Line of Evidence (LOE) for Decision ID 160486, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309251
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
The California Maximum Contaminant Level for nitrate + nitrite (as N) incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 10 mg/L (California Code of Regulations, Title 22).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 160486, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331900
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
45
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 45 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
The Primary California Maximum Contaminant Level for nitrate + nitrite (as N) incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 10 mg/L (California Code of Regulations, Title 22).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-01-18 and 2019-09-25
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrogen, Nitrate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
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 one 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 water quality objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152203, Nitrogen, Nitrate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309240
Pollutant:
Nitrogen, Nitrate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrate as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected on a single day 1/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrogen, Nitrite
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
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 one samples exceed the water quality objective for Municipal & Domestic Supply.
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 water quality objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152204, Nitrogen, Nitrite
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309241
Pollutant:
Nitrogen, Nitrite
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrite as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected on a single day 1/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for toxicants (Table 3.1 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160486, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309239
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Nitrate/Nitrite as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected over the time period 2/16/2009-6/18/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Line of Evidence (LOE) for Decision ID 160486, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309251
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
The California Maximum Contaminant Level for nitrate + nitrite (as N) incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 10 mg/L (California Code of Regulations, Title 22).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 160486, Nitrate/Nitrite (Nitrite + Nitrate as N)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331900
Pollutant:
Nitrate/Nitrite (Nitrite + Nitrate as N)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
45
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 45 samples exceeded the water quality threshold for Nitrate + Nitrite as N.
The Primary California Maximum Contaminant Level for nitrate + nitrite (as N) incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 10 mg/L (California Code of Regulations, Title 22).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-01-18 and 2019-09-25
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oryzalin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160507, Oryzalin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331984
Pollutant:
Oryzalin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Oryzalin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for oryzalin is the USEPA Aquatic Life Benchmark of 13 ug/L for a vascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrogen, Nitrate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
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 one 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 water quality objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152203, Nitrogen, Nitrate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309240
Pollutant:
Nitrogen, Nitrate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrate as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected on a single day 1/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Nitrogen, Nitrite
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)(2018)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
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 one samples exceed the water quality objective for Municipal & Domestic Supply.
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 water quality objective and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152204, Nitrogen, Nitrite
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309241
Pollutant:
Nitrogen, Nitrite
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Nitrite as N.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected on a single day 1/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oxamyl (Vydate)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160488, Oxamyl (Vydate)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331989
Pollutant:
Oxamyl (Vydate)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Oxamyl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).
Line of Evidence (LOE) for Decision ID 160488, Oxamyl (Vydate)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331991
Pollutant:
Oxamyl (Vydate)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Oxamyl.
The California Primary Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2015-04-23
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oryzalin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160507, Oryzalin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331984
Pollutant:
Oryzalin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Oryzalin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for oryzalin is the USEPA Aquatic Life Benchmark of 13 ug/L for a vascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oxyfluorfen
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160514, Oxyfluorfen
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332000
Pollutant:
Oxyfluorfen
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
9
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Oxyfluorfen.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of oxyfluorfen does not exceed 0.14 ug/L (Bower, et al. 2017).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
PAHs (Polycyclic Aromatic Hydrocarbons)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 165331, PAHs (Polycyclic Aromatic Hydrocarbons)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309282
Pollutant:
PAHs (Polycyclic Aromatic Hydrocarbons)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for PAHs (Polycyclic Aromatic Hydrocarbons) .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oxamyl (Vydate)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160488, Oxamyl (Vydate)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331989
Pollutant:
Oxamyl (Vydate)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Oxamyl.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for oxamyl is the USEPA Aquatic Life Benchmark of 27 ug/L for an invertebrate (chronic).
Line of Evidence (LOE) for Decision ID 160488, Oxamyl (Vydate)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331991
Pollutant:
Oxamyl (Vydate)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Oxamyl.
The California Primary Maximum Contaminant Level for Oxamyl incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.05 mg/L
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-02-15 and 2015-04-23
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Oxyfluorfen
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160514, Oxyfluorfen
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332000
Pollutant:
Oxyfluorfen
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
9
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 9 samples exceeded the water quality threshold for Oxyfluorfen.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of oxyfluorfen does not exceed 0.14 ug/L (Bower, et al. 2017).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
PAHs (Polycyclic Aromatic Hydrocarbons)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 165331, PAHs (Polycyclic Aromatic Hydrocarbons)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309282
Pollutant:
PAHs (Polycyclic Aromatic Hydrocarbons)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for PAHs (Polycyclic Aromatic Hydrocarbons) .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Total PAHs from MacDonald et al., 2000a which states that the probable effect concentration for Total PAHs is 22800 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for PAH's is 22,800 ug/Kg dry weight (MacDonald, 2000).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for PAH's is 22,800 ug/Kg dry weight (MacDonald, 2000).
The evaluation guideline for Total PAHs from MacDonald et al., 2000a which states that the probable effect concentration for Total PAHs is 22800 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for PAH's is 22,800 ug/Kg dry weight (MacDonald, 2000).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for PAH's is 22,800 ug/Kg dry weight (MacDonald, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160492, PCBs (Polychlorinated biphenyls)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309244
Pollutant:
PCBs (Polychlorinated biphenyls)
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:
Zero of 1 sample collected for Total PCBs exceeded the evaluation guideline.
Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).
In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total PCB is 676 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160492, PCBs (Polychlorinated biphenyls)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309277
Pollutant:
PCBs (Polychlorinated biphenyls)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls) .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Total PCBs from MacDonald et al., 2000a which states that the probable effect concentration for Total PCBs is 676 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160492, PCBs (Polychlorinated biphenyls)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333242
Pollutant:
PCBs (Polychlorinated biphenyls)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls) .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for total PCBs is the probable effect concentration (PEC) of 676 ug/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160492, PCBs (Polychlorinated biphenyls)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309244
Pollutant:
PCBs (Polychlorinated biphenyls)
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:
Zero of 1 sample collected for Total PCBs exceeded the evaluation guideline.
Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses (Water Quality Control Plan for the Sacramento and San Joaquin River Basins).
In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total PCB is 676 ug/Kg dry weight (MacDonald et al. 2000).
Line of Evidence (LOE) for Decision ID 160492, PCBs (Polychlorinated biphenyls)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309277
Pollutant:
PCBs (Polychlorinated biphenyls)
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 6 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls) .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Total PCBs from MacDonald et al., 2000a which states that the probable effect concentration for Total PCBs is 676 ug/kg. (dw = Dry Weight)
Line of Evidence (LOE) for Decision ID 160492, PCBs (Polychlorinated biphenyls)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333242
Pollutant:
PCBs (Polychlorinated biphenyls)
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for PCBs (Polychlorinated biphenyls) .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for total PCBs is the probable effect concentration (PEC) of 676 ug/kg dry weight (MacDonald et al., 2000a).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Paraquat
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160535, Paraquat
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332262
Pollutant:
Paraquat
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Paraquat. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for paraquat is the USEPA Aquatic Life Benchmark of 0.396 ug/L for a nonvascular plant (acute) for Paraquat dichloride.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pendimethalin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160517, Pendimethalin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332303
Pollutant:
Pendimethalin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Pendimethalin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for pendimethalin is the USEPA Aquatic Life Benchmark of 5.2 ug/L for a nonvascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Permethrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333249
Pollutant:
Permethrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Permethrin, Total .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evalu
DECISION ID
160535
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Paraquat
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160535, Paraquat
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332262
Pollutant:
Paraquat
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Paraquat. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for paraquat is the USEPA Aquatic Life Benchmark of 0.396 ug/L for a nonvascular plant (acute) for Paraquat dichloride.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pendimethalin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160517, Pendimethalin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332303
Pollutant:
Pendimethalin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for Pendimethalin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for pendimethalin is the USEPA Aquatic Life Benchmark of 5.2 ug/L for a nonvascular plant (acute).
ation guideline for permethrin, 0.89 ug/g, is one-tenth of the median lethal concentration (LC50; 8.9 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332344
Pollutant:
Permethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Permethrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for permethrin is 1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Permethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309245
Pollutant:
Permethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for permethrin, 0.89 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 8.9 ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for permethrin (Amweg et al. 2005).
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309281
Pollutant:
Permethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Permethrin, Total. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for permethrin, 0.89 ug/g, is one-tenth of the median lethal concentration (LC50; 8.9 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Phenanthrene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152208, Phenanthrene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309287
Pollutant:
Phenanthrene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Phenanthrene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Permethrin
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333249
Pollutant:
Permethrin
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Permethrin, Total .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluMacDonald et al., 2000a which states that the probable effect concentration for Phenanthrene is 1170 ug/kg. (dw = Dry Weight)
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Phenanthrene is 1,170 ug/Kg dry weight (Macdonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Phorate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160518, Phorate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332515
Pollutant:
Phorate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phorate.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Phosmet
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160524, Phosmet
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332519
Pollutant:
Phosmet
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Phosmet.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).
ation guideline for permethrin, 0.89 ug/g, is one-tenth of the median lethal concentration (LC50; 8.9 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332344
Pollutant:
Permethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Permethrin. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The chronic concentration goal for permethrin is 1 ng/L (expressed as a 4-day average). If the freely dissolved concentrations of Permethrin were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309245
Pollutant:
Permethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The sample was not assessed because, after the laboratory method detection limit result was organic carbon-normalized, the result was above the evaluation guideline and, therefore the result could not be quantified with the level of certainty required by the Listing Policy.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
The evaluation guideline value for permethrin, 0.89 ug/g OC, is one-tenth of the median lethal concentration for H. azteca (LC50; 8.9 ug/g OC). The LC50 is the geometric mean of OC-normalized LC50 values for permethrin (Amweg et al. 2005).
Line of Evidence (LOE) for Decision ID 160537, Permethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309281
Pollutant:
Permethrin
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Permethrin, Total. Although a total of 4 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for permethrin, 0.89 ug/g, is one-tenth of the median lethal concentration (LC50; 8.9 ug/g) and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Propachlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160519, Propachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332533
Pollutant:
Propachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Propachlor.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for propachlor is the USEPA Aquatic Life Benchmark of 13.5 ug/L for a nonvascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Phenanthrene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152208, Phenanthrene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309287
Pollutant:
Phenanthrene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Phenanthrene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Propoxur
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160493, Propoxur
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332534
Pollutant:
Propoxur
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Propoxur.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for propoxur is the USEPA Aquatic Life Benchmark of 5.5 ug/L for invertebrates (acute).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
In freshwater sediments, the probable effect level (predictive of sediment toxicity) for Phenanthrene is 1,170 ug/Kg dry weight (Macdonald et al. 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyraclostrobin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160539, Pyraclostrobin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332541
Pollutant:
Pyraclostrobin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Pyraclostrobin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for pyraclostrobin is the USEPA Aquatic Life Benchmark of 1.5 ug/L for a nonvascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Phorate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160518, Phorate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332515
Pollutant:
Phorate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Phorate.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for phorate is the USEPA Aquatic Life Benchmark of 0.21 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyrene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152209, Pyrene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309289
Pollutant:
Pyrene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Pyrene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Pyrene from MacDonald et al., 2000a which
DECISION ID
160524
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Phosmet
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160524, Phosmet
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332519
Pollutant:
Phosmet
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Phosmet.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for phosmet is the USEPA Aquatic Life Benchmark of 0.75 ug/L for an invertebrate (chronic).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Propachlor
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160519, Propachlor
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332533
Pollutant:
Propachlor
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Propachlor.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for propachlor is the USEPA Aquatic Life Benchmark of 13.5 ug/L for a nonvascular plant (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Propoxur
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160493, Propoxur
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332534
Pollutant:
Propoxur
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Propoxur.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for propoxur is the USEPA Aquatic Life Benchmark of 5.5 ug/L for invertebrates (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyrethroids
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Five lines of evidence are available in the administrative record to assess this pollutant. Two of the seven sediment samples exceed the evaluation guideline for COLD. Zero of two exceeding samples exhibited sediment toxicity. Additionally, one of one water sample, reported as total concentration, exceed the evaluation guideline for COLD.
Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for 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. Two of the seven sediment samples exceed the evaluation guideline for COLD and this sample size is sufficient to determine beneficial use support, with the power and confidence of the Listing Policy. However, there is no evidence of associated sediment toxicity as required by Section 3.6 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 although this water body exceeds the guideline for sediment chemistry, this water body-pollutant combination should not be placed on the section 303(d) list because there is no associated evidence of sediment toxicity as required by the Listing Policy.
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 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332592
Pollutant:
Pyrethroids
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Lis
DECISION ID
160539
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyraclostrobin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160539, Pyraclostrobin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332541
Pollutant:
Pyraclostrobin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the water quality threshold for Pyraclostrobin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for pyraclostrobin is the USEPA Aquatic Life Benchmark of 1.5 ug/L for a nonvascular plant (acute).
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333265
Pollutant:
Pyrethroids
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 2 of the 2 samples exceeded the evaluation guideline for Pyrethroids .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective 1/10 LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309354
Pollutant:
Pyrethroids
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 6 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective 1/10 LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347510
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 2 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival, Hyalella azteca for Growth (wt/surv indiv).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
The samples were collected at monitoring site: 531SAC001 (
DECISION ID
152209
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyrene
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)(2020)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 152209, Pyrene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309289
Pollutant:
Pyrene
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 3 samples exceeded the evaluation guideline for Pyrene .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332612
Pollutant:
Pyrethroids
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater 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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Pyrethroids.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyridaben
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160543, Pyridaben
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332628
Pollutant:
Pyridaben
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyridaben. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for pyridaben is the USEPA Aquatic Life Benchmark of 0.044 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Siduron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160508, Siduron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332651
Pollutant:
Siduron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Siduron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for siduron is the USEPA Aquatic Life Benchmark of 6 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyrethroids
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Five lines of evidence are available in the administrative record to assess this pollutant. Two of the seven sediment samples exceed the evaluation guideline for COLD. Zero of two exceeding samples exhibited sediment toxicity. Additionally, one of one water sample, reported as total concentration, exceed the evaluation guideline for COLD.
Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for 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. Two of the seven sediment samples exceed the evaluation guideline for COLD and this sample size is sufficient to determine beneficial use support, with the power and confidence of the Listing Policy. However, there is no evidence of associated sediment toxicity as required by Section 3.6 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 although this water body exceeds the guideline for sediment chemistry, this water body-pollutant combination should not be placed on the section 303(d) list because there is no associated evidence of sediment toxicity as required by the Listing Policy.
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 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332592
Pollutant:
Pyrethroids
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 13 samples were collected, 13 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Lis
DECISION ID
166834
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Silver
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166834, Silver
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
345864
Pollutant:
Silver
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver.
The California Secondary Maximum Contaminant Level for silver incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.1 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-08-02 and 2006-03-01
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333265
Pollutant:
Pyrethroids
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 2 of the 2 samples exceeded the evaluation guideline for Pyrethroids .
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective 1/10 LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309354
Pollutant:
Pyrethroids
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 5 samples exceeded the evaluation guideline for Pyrethroids. Although a total of 6 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the objective and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basins)
The evaluation guideline for the protection of aquatic life from pyrethroids is one toxic unit. Individual pyrethroid concentrations in sediment were normalized to organic carbon content, divided by the respective 1/10 LC50 and then summed. A sum over over one toxic unit is an exceedance of the evaluation guideline (Amweg et al. 2006).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Simazine
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160494, Simazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332656
Pollutant:
Simazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Simazine.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).
Line of Evidence (LOE) for Decision ID 160494, Simazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332655
Pollutant:
Simazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Simazine.
The California Primary Maximum Contaminant Level for Simazine incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.004 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-01-18 and 2018-02-20
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
347510
Pollutant:
Toxicity
LOE Subgroup:
Toxicity
Matrix:
Sediment
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
TOXICITY TESTING
Data Used to Assess Water Quality:
0 of the 2 samples collected by SWAMP Stream Pollution Trends for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) exhibited toxicity. A sample may have multiple toxicity test results, but will only be counted once. A sample is defined as being collected on the same day and the same location. The following organisms and parameters were utilized for the toxicity tests: Hyalella azteca for Survival, Hyalella azteca for Growth (wt/surv indiv).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The sample is toxic when the response of the organisms exposed to the sample is significantly different (worse) than the response of the organisms exposed to the laboratory control based on statistical hypothesis testing. An exceedance is counted when the significant effect code is "Significant; Less Similarity," which means that the sample result is significantly different than the control result, and the percent effect is greater than the evaluation threshold. The default evaluation threshold is 20% unless otherwise stated.
Line of Evidence (LOE) for Decision ID 160501, Pyrethroids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332612
Pollutant:
Pyrethroids
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater 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 Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for Pyrethroids.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The summed ratios of the pyrethroid pesticides bifenthrin, cyfluthrin, cypermethrin, esfenvalerate, lambda-cyhalothrin, permethrin and their respective chronic concentration goals are not to exceed 1. If the freely dissolved concentrations of these pesticides were reported or could be calculated then these values were used for this assessment. In the absence of freely dissolved concentrations, total concentrations were used.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Pyridaben
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160543, Pyridaben
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332628
Pollutant:
Pyridaben
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Pyridaben. Although a total of 3 samples were collected, 3 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for pyridaben is the USEPA Aquatic Life Benchmark of 0.044 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Specific Conductivity
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346506
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 5 samples fall within the range, and 5 of 5 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Referenc
DECISION ID
160508
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Siduron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160508, Siduron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332651
Pollutant:
Siduron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Siduron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for siduron is the USEPA Aquatic Life Benchmark of 6 ug/L for an invertebrate (chronic).
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2013-09-04 and 2018-07-10
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346492
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532PS0667 (Cosumnes River ~0.5mi below Michigan Bar Rd.).
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346544
Pollutant:
DECISION ID
166834
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Silver
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166834, Silver
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
345864
Pollutant:
Silver
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Silver.
The California Secondary Maximum Contaminant Level for silver incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.1 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-08-02 and 2006-03-01
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 5 samples fall within the range, and 5 of 5 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2014-05-05
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358049
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS016 (Cosumnes River above Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358066
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358051
DECISION ID
160494
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Simazine
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160494, Simazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332656
Pollutant:
Simazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Simazine.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for simazine is the USEPA Aquatic Life Benchmark of 6 ug/L for a nonvascular plant (acute).
Line of Evidence (LOE) for Decision ID 160494, Simazine
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332655
Pollutant:
Simazine
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Simazine.
The California Primary Maximum Contaminant Level for Simazine incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.004 mg/L.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2011-01-18 and 2018-02-20
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358050
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358065
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 2 samples fall within the range, and 2 of 2 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2019-07-20 and 2021-09-17
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332785
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 12 samples fall within the range, and 12 of 12 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-12-07 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332781
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 4 samples fall within the range, and 4 of 4 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
345922
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 3 samples fall within the range, and 3 of 3 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-09-06 and 2009-07-26
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Specific Conductivity
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy.
Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy).
The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy.
Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346506
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
5
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 5 samples fall within the range, and 5 of 5 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Referenc
DECISION ID
166835
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Sulfates
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166835, Sulfates
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346682
Pollutant:
Sulfates
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Sulfate. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for sulfate of 250-500 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532PS0667 (Cosumnes River ~0.5mi below Michigan Bar Rd.).
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2013-09-04 and 2018-07-10
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346492
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532PS0667 (Cosumnes River ~0.5mi below Michigan Bar Rd.).
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346544
Pollutant:
DECISION ID
160449
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
T-Fluvalinate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160449, T-Fluvalinate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332876
Pollutant:
T-Fluvalinate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for T-Fluvalinate.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for tau-fluvalinate is the USEPA Aquatic Life Benchmark of 0.064 ug/L for a fish (chronic).
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 5 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 5 samples fall within the range, and 5 of 5 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2014-05-05
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358049
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
DECISION ID
160509
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Tebuthiuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160509, Tebuthiuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332883
Pollutant:
Tebuthiuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Tebuthiuron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for tebuthiuron is the USEPA Aquatic Life Benchmark of 50 ug/L for a nonvascular plant (acute).
The samples were collected at 1 monitoring site: 532COS016 (Cosumnes River above Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358066
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358051
DECISION ID
160495
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Temperature, water
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty-six lines of evidence are available in the administrative record to assess this pollutant.
Pursuant to section 6.1.5.9 of the Listing Policy, this assessment utilized the upper limit of the optimal temperature range for rainbow trout for growth and completion of most life stages to interpret the narrative water quality objective for temperature. Thirty-six of 118 samples exceeded the evaluation guideline for COLD. Thirteen of 43 samples exceeded the evaluation guideline for Fish Migration and Fish Spawning.
However, the available data are insufficient to satisfy the Listing Policy requirements for spatial and temporal representation (sections 6.1.5.2 and 6.1.5.3). The surface water grab samples collected did not provide sufficient temporal and spatial representation to determine if temperature conditions experienced by aquatic life were within the optimal temperature range throughout the entire water column or the length of time temperature conditions may have exceeded the optimal temperature range.
Available information for this waterbody-pollutant combination is insufficient to determine whether the aquatic beneficial use is supported. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available for this Integrated Report cycle indicating that standards are not met.
However, the exceedances of the evaluation guideline indicate that beneficial uses may be threatened. This decision will be reevaluated in the next Integrated Report cycle as more data and information become available. Additional data and information may include information demonstrating that sample location(s) are representative of conditions throughout the waterbody, data from additional sampling locations, continuous monitoring data collected in the waterbody, waterbody-specific information on sensitive resident species, their life stage time frames, and the appropriate temperature thresholds necessary to support each life stage.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309294
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHY
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358050
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial 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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358065
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 2 samples fall within the range, and 2 of 2 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between the dates of 2019-07-20 and 2021-09-17
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309295
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were ct-smooth: always">Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332785
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 12 samples fall within the range, and 12 of 12 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-12-07 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332781
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 4 samples fall within the range, and 4 of 4 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Line of Evidence (LOE) for Decision ID 165349, Specific Conductivity
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
345922
Pollutant:
Specific Conductivity
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 3 samples fall within the range, and 3 of 3 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900-1600 uS/cm assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-09-06 and 2009-07-26
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309296
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309306
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
DECISION ID
166835
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Sulfates
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166835, Sulfates
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346682
Pollutant:
Sulfates
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Sulfate. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for sulfate of 250-500 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532PS0667 (Cosumnes River ~0.5mi below Michigan Bar Rd.).
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
T-Fluvalinate
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160449, T-Fluvalinate
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332876
Pollutant:
T-Fluvalinate
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for T-Fluvalinate.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for tau-fluvalinate is the USEPA Aquatic Life Benchmark of 0.064 ug/L for a fish (chronic).
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309307
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
5
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Guideline Reference:
DECISION ID
160509
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Tebuthiuron
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160509, Tebuthiuron
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332883
Pollutant:
Tebuthiuron
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
10
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 10 samples exceeded the water quality threshold for Tebuthiuron.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for tebuthiuron is the USEPA Aquatic Life Benchmark of 50 ug/L for a nonvascular plant (acute).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309308
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309309
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
DECISION ID
160495
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Temperature, water
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Twenty-six lines of evidence are available in the administrative record to assess this pollutant.
Pursuant to section 6.1.5.9 of the Listing Policy, this assessment utilized the upper limit of the optimal temperature range for rainbow trout for growth and completion of most life stages to interpret the narrative water quality objective for temperature. Thirty-six of 118 samples exceeded the evaluation guideline for COLD. Thirteen of 43 samples exceeded the evaluation guideline for Fish Migration and Fish Spawning.
However, the available data are insufficient to satisfy the Listing Policy requirements for spatial and temporal representation (sections 6.1.5.2 and 6.1.5.3). The surface water grab samples collected did not provide sufficient temporal and spatial representation to determine if temperature conditions experienced by aquatic life were within the optimal temperature range throughout the entire water column or the length of time temperature conditions may have exceeded the optimal temperature range.
Available information for this waterbody-pollutant combination is insufficient to determine whether the aquatic beneficial use is supported. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available for this Integrated Report cycle indicating that standards are not met.
However, the exceedances of the evaluation guideline indicate that beneficial uses may be threatened. This decision will be reevaluated in the next Integrated Report cycle as more data and information become available. Additional data and information may include information demonstrating that sample location(s) are representative of conditions throughout the waterbody, data from additional sampling locations, continuous monitoring data collected in the waterbody, waterbody-specific information on sensitive resident species, their life stage time frames, and the appropriate temperature thresholds necessary to support each life stage.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309294
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYign="left" valign="top" width="33%">Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309310
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309311
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
5
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309295
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were clspan="2">
LOE ID:
309326
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309327
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309296
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309306
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Non-SWAMP
Water Quality Objective/Criterion:
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309328
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP foidth="33%">Number of Samples:
5
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309307
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
5
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309329
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309308
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309309
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309331
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
15
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperaturign="left" valign="top" width="33%">Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309310
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
1
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309332
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
15
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309311
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
5
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 3 of 5 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309333
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309334
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as flspan="2">
LOE ID:
309326
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309327
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309328
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309335
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309329
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309330
Pollutant:
Temperature, water
LOE Subgroup:
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309336
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to width="67%">Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309331
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
15
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperaturDelta Waterways)
LOE ID:
309337
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
15
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309203
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 6 samples exceed the criterion for Water Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in te does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309332
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
15
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected over the time period 2/16/2009-7/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332974
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
5
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 5 of 6 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309333
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Migration
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309334
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as ftyle="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332956
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
56
Number of Exceedances:
12
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 12 of 56 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332954
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 2 of 3 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332983
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309335
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
Number of Samples:
4
Number of Exceedances:
4
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 4 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS017)
DECISION ID
160496
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Tetrachlorvinphos
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160496, Tetrachlorvinphos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332996
Pollutant:
Tetrachlorvinphos
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Tetrachlorvinphos.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for stirophos (tetrachlorvinphos) is the USEPA Aquatic Life Benchmark of 0.125 ug/L for an invertebrate (chronic).
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309336
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Not Recorded
Beneficial Use:
Fish Spawning
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 2 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to
DECISION ID
160451
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Tetramethrin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160451, Tetramethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333000
Pollutant:
Tetramethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Tetramethrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for tetramethrin is the USEPA Aquatic Life Benchmark of 1.85 ug/L for a fish (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Thiobencarb
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166837, Thiobencarb
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346061
Pollutant:
Thiobencarb
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 ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb.
The California Secondary Maximum Contaminant Level for thiobencarb by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2006-03-16 and 2006-03-16
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 15 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309203
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Ag Waiver data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 6 samples exceed the criterion for Water Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Juoaquin River Basin Plans).
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected over the time period 2/16/2009-7/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed.
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332974
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
5
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 5 of 6 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Total Dissolved Solids
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Lines of evidence (LOEs) for this waterbody-pollutant combination from previous assessment cycles have been reassessed. During this process, quality assurance concerns were identified and are currently under investigation. Until these concerns are resolved, the associated data will not be used to determine a use support rating. This decision will be revisited in a future cycle once the data quality has been fully evaluated. If the data are ultimately deemed unusable, the decision will be retired.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 172183, Total Dissolved Solids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358024
Pollutant:
Total Dissolved Solids
LOE Subgroup:
Ancillary Line of Evidence
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Lines of evidence (LOEs) for this waterbody-pollutant combination from previous assessment cycles have been reassessed. During this process, quality assurance concerns were identified and are currently under investigation. Until these concerns are resolved, the associated data will not be used to determine a use support rating. This LOE is a placeholder only and does not represent an actual assessment of data.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for total dissolved solids of 500-1000 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information:
Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
tyle="background-color:#CCCCCC; PADDING-RIGHT: 2%; PADDING-LEFT: 0%; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332956
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
56
Number of Exceedances:
12
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 12 of 56 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332954
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 2 of 3 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Line of Evidence (LOE) for Decision ID 160495, Temperature, water
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332983
Pollutant:
Temperature, water
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 2 of 4 samples exceeded the water quality threshold for Temperature.
The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans).
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Tetrachlorvinphos
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160496, Tetrachlorvinphos
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332996
Pollutant:
Tetrachlorvinphos
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the water quality threshold for Tetrachlorvinphos.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for stirophos (tetrachlorvinphos) is the USEPA Aquatic Life Benchmark of 0.125 ug/L for an invertebrate (chronic).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Toxaphene
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160497, Toxaphene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333033
Pollutant:
Toxaphene
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160497, Toxaphene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333032
Pollutant:
Toxaphene
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The toxaphene criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0002 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Tetramethrin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160451, Tetramethrin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333000
Pollutant:
Tetramethrin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 13 samples exceeded the water quality threshold for Tetramethrin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for tetramethrin is the USEPA Aquatic Life Benchmark of 1.85 ug/L for a fish (acute).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Trifluralin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160499, Trifluralin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333035
Pollutant:
Trifluralin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Trifluralin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Trifluralin does not exceed 0.33 ug/L in the water column more than once every three years on average (Bower, et al. 2017).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Thiobencarb
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 166837, Thiobencarb
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346061
Pollutant:
Thiobencarb
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 ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the water quality threshold for Thiobencarb.
The California Secondary Maximum Contaminant Level for thiobencarb by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 0.001 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2006-03-16 and 2006-03-16
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Total Dissolved Solids
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Lines of evidence (LOEs) for this waterbody-pollutant combination from previous assessment cycles have been reassessed. During this process, quality assurance concerns were identified and are currently under investigation. Until these concerns are resolved, the associated data will not be used to determine a use support rating. This decision will be revisited in a future cycle once the data quality has been fully evaluated. If the data are ultimately deemed unusable, the decision will be retired.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 172183, Total Dissolved Solids
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
358024
Pollutant:
Total Dissolved Solids
LOE Subgroup:
Ancillary Line of Evidence
Matrix:
Water
Fraction:
None
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Lines of evidence (LOEs) for this waterbody-pollutant combination from previous assessment cycles have been reassessed. During this process, quality assurance concerns were identified and are currently under investigation. Until these concerns are resolved, the associated data will not be used to determine a use support rating. This LOE is a placeholder only and does not represent an actual assessment of data.
The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for total dissolved solids of 500-1000 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information:
Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Zinc
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
LOEs for this waterbody-pollutant combination from previous cycles were reviewed, determined to be inaccurate, and removed.
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.
Five lines of evidence are available in the administrative record to assess this pollutant. Zero of two water samples reported in the dissolved fraction exceed the objective for MUN, zero of 8 water samples reported in the dissolved fraction exceed the criteria for COLD and zero of 9 sediment samples exceed the evaluation guideline for COLD.
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. Zero of two water samples reported in the dissolved fraction exceed the objective for MUN, zero of 8 water samples reported in the dissolved fraction exceed the criteria for COLD and zero of 9 sediment samples exceed the evaluation guideline for COLD 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 not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309179
Pollutant:
Zinc
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Zero of the 8 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CMC for Zinc
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Toxaphene
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160497, Toxaphene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333033
Pollutant:
Toxaphene
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
Line of Evidence (LOE) for Decision ID 160497, Toxaphene
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333032
Pollutant:
Toxaphene
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
0
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support, and the results are as follows: 0 of the 0 samples exceeded the evaluation guideline for Toxaphene. Although a total of 1 samples were collected, 1 of these samples were not included in the assessment because the laboratory data reporting limit(s) was above the water quality threshold and therefore the results could not be quantified with the level of certainty required by the Listing Policy Section 6.1.5.5.
The toxaphene criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.0002 ug/L (California Toxics Rule, 2000).
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between November 28, 2000, and November 27, 2001
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346143
Pollutant:
Zinc
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Zinc.
The California Secondary Maximum Contaminant Level for zinc incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 5.0 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-08-02 and 2006-03-16
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333275
Pollut
DECISION ID
160499
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Trifluralin
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160499, Trifluralin
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333035
Pollutant:
Trifluralin
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Trifluralin.
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
UC Davis Aquatic Life Criteria: Aquatic life should not be affected unacceptably if the four-day average concentration of Trifluralin does not exceed 0.33 ug/L in the water column more than once every three years on average (Bower, et al. 2017).
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Zinc .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for zinc is the probable effect concentration (PEC) of 459 mg/kg dry weight (MacDonald et al., 2000a).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309288
Pollutant:
Zinc
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Zinc .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Zinc from MacDonald et al., 2000a which states that the probable effect concentration for Zinc is 459 mg/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160462, alpha-Endosulfan (Endosulfan 1)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331470
Pollutant:
alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan I.
The endosulfan I (alpha-endosulfan) criterion for the protection human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160462, alpha-Endosulfan (Endosulfan 1)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331472
Pollutant:
alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan I.
The endosulfan I (alpha-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.028 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
Zinc
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
LOEs for this waterbody-pollutant combination from previous cycles were reviewed, determined to be inaccurate, and removed.
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.
Five lines of evidence are available in the administrative record to assess this pollutant. Zero of two water samples reported in the dissolved fraction exceed the objective for MUN, zero of 8 water samples reported in the dissolved fraction exceed the criteria for COLD and zero of 9 sediment samples exceed the evaluation guideline for COLD.
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. Zero of two water samples reported in the dissolved fraction exceed the objective for MUN, zero of 8 water samples reported in the dissolved fraction exceed the criteria for COLD and zero of 9 sediment samples exceed the evaluation guideline for COLD 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 not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309179
Pollutant:
Zinc
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
8
Number of Exceedances:
0
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Zero of the 8 samples collected by the Surface Water Ambient Monitoring Program exceeded the calculated CMC for Zinc
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
beta-Endosulfan (Endosulfan 2)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160490, beta-Endosulfan (Endosulfan 2)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331476
Pollutant:
beta-Endosulfan (Endosulfan 2)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan II.
The endosulfan II (beta-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.028 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160490, beta-Endosulfan (Endosulfan 2)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331475
Pollutant:
beta-Endosulfan (Endosulfan 2)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan II.
The endosulfan II (beta-endosulfan) criterion to protect human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Samples were collected from the Cosumnes River at Twin Cities Road
Temporal Representation:
The samples were collected between November 28, 2000, and November 27, 2001
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
346143
Pollutant:
Zinc
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Dissolved
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ILRP_SVWQC data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for Zinc.
The California Secondary Maximum Contaminant Level for zinc incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 5.0 mg/L assessed as an annual average.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2005-08-02 and 2006-03-16
Environmental Conditions:
QAPP Information:
Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
333275
Pollutant:
Zinc
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 Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the evaluation guideline for Zinc .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
The evaluation guideline for zinc is the probable effect concentration (PEC) of 459 mg/kg dry weight (MacDonald et al., 2000a).
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)
Line of Evidence (LOE) for Decision ID 160500, Zinc
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309288
Pollutant:
Zinc
LOE Subgroup:
Pollutant-Sediment
Matrix:
Sediment
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
7
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and the results are as follows: 0 of the 7 samples exceeded the evaluation guideline for Zinc .
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin River Basin)
The evaluation guideline for Zinc from MacDonald et al., 2000a which states that the probable effect concentration for Zinc is 459 mg/kg. (dw = Dry Weight)
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
pH
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.
Twenty-eight lines of evidence are available in the administrative record to assess this pollutant. Sixteen of the 191 samples exceeded the objective for COLD. Four of the 42 samples exceeded the objective for REC-1 and REC-2.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Sixteen of the 191 samples exceeded the objective for COLD. Four of the 42 samples exceeded the objective for REC-1 and REC-2. This does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332450
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
55
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 55 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332394
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332461
Pollutant:
pH
LOE Subgroup:
Pollutant-Wat
DECISION ID
160462
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
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:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160462, alpha-Endosulfan (Endosulfan 1)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331470
Pollutant:
alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan I.
The endosulfan I (alpha-endosulfan) criterion for the protection human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160462, alpha-Endosulfan (Endosulfan 1)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331472
Pollutant:
alpha-Endosulfan (Endosulfan 1)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan I.
The endosulfan I (alpha-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.028 ug/L (California Toxics Rule, 2000).
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332428
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between t
DECISION ID
160490
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
beta-Endosulfan (Endosulfan 2)
Final Listing Decision:
Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:
New Decision
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160490, beta-Endosulfan (Endosulfan 2)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331476
Pollutant:
beta-Endosulfan (Endosulfan 2)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan II.
The endosulfan II (beta-endosulfan) criterion continuous concentration (expressed as a 4-day average) to protect aquatic life in freshwater is 0.028 ug/L (California Toxics Rule, 2000).
Line of Evidence (LOE) for Decision ID 160490, beta-Endosulfan (Endosulfan 2)
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
331475
Pollutant:
beta-Endosulfan (Endosulfan 2)
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
Total
Beneficial Use:
Municipal & Domestic Supply
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Endosulfan II.
The endosulfan II (beta-endosulfan) criterion to protect human health from the consumption of water and organisms is 110 ug/L (California Toxics Rule, 2000).
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309324
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309323
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
4
Number of
DECISION ID
160491
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
Pollutant:
pH
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)(2024)
Revision Status
Revised
Impairment from Pollutant or Pollution:
Pollutant
Regional Board Conclusion:
This waterbody was split as part of the 2024 cycle Delta Remapping Project. Decisions were reassessed based on the new spatial representation.
This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.
Twenty-eight lines of evidence are available in the administrative record to assess this pollutant. Sixteen of the 191 samples exceeded the objective for COLD. Four of the 42 samples exceeded the objective for REC-1 and REC-2.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List.
This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Sixteen of the 191 samples exceeded the objective for COLD. Four of the 42 samples exceeded the objective for REC-1 and REC-2. This does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation:
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation:
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Listing Extent:
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332450
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
55
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed Sacramento Valley Water Quality Coalition data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 55 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531XCRTWN (Cosumes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2010-11-09 and 2022-05-19
Environmental Conditions:
QAPP Information:
QAPP Reference for Irrigated Lands Regulatory Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332394
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 531SAC001 (Cosumnes River at Twin Cities Road).
Temporal Representation:
The samples were collected between the dates of 2019-07-18 and 2022-07-27
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332461
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
3
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 0 of 3 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS018 (Cosumnes River Mahon Ranch).
Temporal Representation:
The samples were collected between the dates of 2019-07-19 and 2019-09-20
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
332428
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar to Delta Waterways) to determine beneficial use support and results are as follows: 1 of 6 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site: 532COS017 (Cosumnes River Below Granlee Dam).
Temporal Representation:
The samples were collected between tExceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309322
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
Environmental Conditions:
QAPP Information:
QAPP for Consumnes River Water Quality Monitoring Program
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309324
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
2
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309323
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
4
Number of lign="top" width="67%">ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309321
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
15
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 15 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309320
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORIExceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309322
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309321
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
15
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 15 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309320
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309319
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309318
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309317
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
15
Number of Exceedances:
2
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309319
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 15 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309316
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309315
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
15
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 15 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309314
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309318
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
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 ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 2 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS018)
Temporal Representation:
The samples were collected between the dates of 2018-06-15 and 2018-07-20
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309313
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 15 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309316
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309315
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
15
Number of Exceedances:
2
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP RWB5 Monitoring data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 2 of 15 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2010-09-21 and 2014-05-05
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309314
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Data Referregion_5/2019/ref4658.doc" >QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309303
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309302
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater 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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309301
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS016)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309313
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
4
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed ARC Cosumnes River WQ Monitoring Program data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532COS017)
Temporal Representation:
The samples were collected between the dates of 2018-06-16 and 2018-09-22
Environmental Conditions:
QAPP Information:
ARC Cosumnes River Monitoring Program. 2017. QAPP for Consumnes River Water Quality Monitoring Program., ARC Cosumnes River Monitoring Program. 2018. QAPP for Consumnes River Water Quality Monitoring Program.
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309299
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
QAPP for Consumnes River Water Quality Monitoring Program
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309303
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
4
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309302
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater 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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309298
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
4
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309178
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
62
Number of Exceedances:
7
SWAMP Data:
SWAMP
Water Quality Objective/Criterion:
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309301
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (532PS0667)
Temporal Representation:
The samples were collected between the dates of 2015-05-13 and 2015-05-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309300
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
4
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309299
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
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 Perennial Stream Surveys data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 1 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Data and Information Type:
Not Specified
Data Used to Assess Water Quality:
Seven of the 62 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for pH. The exceeded results are as follows: 10/24/2000 - a sample taken at Cosumnes River at Twin Cities Road had a result of 6.2none. 1/23/2001 - a sample taken at Cosumnes River at Twin Cities Road had a result of 8.9none. 3/27/2001 - a sample taken at Cosumnes River at Twin Cities Road had a result of 6.4none. 5/29/2001 - a sample taken at Cosumnes River at Twin Cities Road had a result of 6none. 2/12/2002 - a sample taken at Cosumnes River at Twin Cities Road had a result of 8.6none. 10/27/2004 - a sample taken at Cosumnes River at Twin Cities Road had a result of 8.6none. 11/22/2004 - a sample taken at Cosumnes River at Twin Cities Road had a result of 9.3none.
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Nov 29 2005
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309191
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Aquatic Life Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The Sacramento Valley Water Quality Coalition collected 13 samples from January 2005 to August 2006. Three of the 13 samples had a pH value outside the evaluation objective.
The pH of water shall not be depressed below 6.5,raised above 8.5, or changed at any time more than 0.5 units from normal ambient pH. Measurement of pH within the range of 6.5 and 8.5. A low pH has a value less than 6.5.
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309298
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
4
Number of Exceedances:
1
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed SWAMP Stream Pollution Trends data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 1 of 4 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (531SAC001)
Temporal Representation:
The samples were collected between the dates of 2014-08-27 and 2018-07-10
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309178
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
62
Number of Exceedances:
7
<" width="67%">Samples were collected from Cosumnes River at Twin Cities Road
Temporal Representation:
Sampling occurred from January 2005 to August 2006
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number R5-2003-0826) requirements (CVRWQCB, 2003)
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309249
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
State Water Board staff assessed ILRP data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 6 samples exceed the criterion for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [ Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected over the time period 2/16/2009-7/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309291
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were collected between the dates of 2010-10-25 and 2016-04-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309292
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were collected between the dates of 2010-10-25 and 2016-04-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309293
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were collected between the dates of 2010-10-25 and 2016-04-13
Seven of the 62 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for pH. The exceeded results are as follows: 10/24/2000 - a sample taken at Cosumnes River at Twin Cities Road had a result of 6.2none. 1/23/2001 - a sample taken at Cosumnes River at Twin Cities Road had a result of 8.9none. 3/27/2001 - a sample taken at Cosumnes River at Twin Cities Road had a result of 6.4none. 5/29/2001 - a sample taken at Cosumnes River at Twin Cities Road had a result of 6none. 2/12/2002 - a sample taken at Cosumnes River at Twin Cities Road had a result of 8.6none. 10/27/2004 - a sample taken at Cosumnes River at Twin Cities Road had a result of 8.6none. 11/22/2004 - a sample taken at Cosumnes River at Twin Cities Road had a result of 9.3none.
Samples were collected at Cosumnes River at Twin Cities Road.
Temporal Representation:
The samples were collected from Oct 24 2000 to Nov 29 2005
Environmental Conditions:
QAPP Information:
Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309191
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Aquatic Life Use:
Cold Freshwater Habitat
Number of Samples:
13
Number of Exceedances:
3
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
The Sacramento Valley Water Quality Coalition collected 13 samples from January 2005 to August 2006. Three of the 13 samples had a pH value outside the evaluation objective.
The pH of water shall not be depressed below 6.5,raised above 8.5, or changed at any time more than 0.5 units from normal ambient pH. Measurement of pH within the range of 6.5 and 8.5. A low pH has a value less than 6.5.
Samples were collected from Cosumnes River at Twin Cities Road
Temporal Representation:
Sampling occurred from January 2005 to August 2006
Environmental Conditions:
QAPP Information:
Data quality: Good. Monitoring was conducted in accordance with Central Valley Water Board Monitoring and Reporting Program (order number R5-2003-0826) requirements (CVRWQCB, 2003)
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309249
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
6
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
State Water Board staff assessed ILRP data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 6 samples exceed the criterion for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Data for this line of evidence for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) was collected at 1 monitoring site [ Cosumes River at Twin Cities Road - 531XCRTWN]
Temporal Representation:
Data was collected over the time period 2/16/2009-7/26/2009.
Environmental Conditions:
Staff is not aware of any special conditions that might affect interpretation of the data.
QAPP Information:
The Quality Assurance Project Plan for Sacramento Valley Water Quality Coalition was followed
QAPP Information Reference(s):
Line of Evidence (LOE) for Decision ID 160491, pH
Region 5
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309291
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Cold Freshwater Habitat
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were collected between the dates of 2010-10-25 and 2016-04-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309292
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Water Contact Recreation
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were collected between the dates of 2010-10-25 and 2016-04-13
Cosumnes River, Lower (below Michigan Bar to Delta Waterways)
LOE ID:
309293
Pollutant:
pH
LOE Subgroup:
Pollutant-Water
Matrix:
Water
Fraction:
None
Beneficial Use:
Non-Contact Recreation
Number of Samples:
12
Number of Exceedances:
0
Data and Information Type:
PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality:
Water Board staff assessed STORET data for Cosumnes River, Lower (below Michigan Bar; partly in Delta Waterways, eastern portion) to determine beneficial use support and results are as follows: 0 of 12 samples exceeded the water quality threshold for pH.
Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.
Objective/Criterion Reference:
Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
The samples were collected at 1 monitoring site (CALWR_WQX-B1115000)
Temporal Representation:
The samples were collected between the dates of 2010-10-25 and 2016-04-13