Water Quality Objective/Criterion: |
All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. The objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. |
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DECISION ID |
10198 |
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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: |
New Decision |
Revision Status |
Revised |
Impairment from Pollutant or Pollution: |
Pollutant |
|
Weight of Evidence: |
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 2 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 0 of 2 available concentrations exceeded the USEPA Primary MCL and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is based on staff findings that 0 of 2 available concentrations exceeded the USEPA National Ambient Water Quality Objective and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of 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. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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LOE ID: |
20755 |
|
Pollutant: |
Nitrate as Nitrate (NO3) |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Municipal & Domestic Supply |
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Number of Samples: |
2 |
Number of Exceedances: |
0 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
0 of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Nitrate-N. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
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) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
|
Evaluation Guideline: |
Nitrate-N levels should not exceed 45 mg/L (Department of Public Health Primary MCL) |
Guideline Reference: |
Compilation of Water Quality Goals |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Jun 13 2002 to Jun 26 2002 |
Environmental Conditions: |
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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): |
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LOE ID: |
6388 |
|
Pollutant: |
Nitrate as Nitrate (NO3) |
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: |
Not Specified |
Data Used to Assess Water Quality: |
0 of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Nitrate-N. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
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) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
|
Evaluation Guideline: |
Nitrate-N levels should not to exceed 100 mg/L (USEPA National Ambient Water Quality Objective) |
Guideline Reference: |
National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology. 4304T |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Jun 13 2002 to Jun 26 2002 |
Environmental Conditions: |
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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 |
10199 |
|
Pollutant: |
Selenium |
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 |
|
Weight of Evidence: |
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 2 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 only 1 sample is available and a minimum of 2 samples is needed for evaluation under section 3.1 for the Municipal Beneficial Use and for the Cold Water Habitat. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of 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. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 10199 |
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LOE ID: |
6943 |
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Pollutant: |
Selenium |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Cold Freshwater Habitat |
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Number of Samples: |
1 |
Number of Exceedances: |
0 |
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Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Zero of the 1 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Selenium. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
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) Selenium levels should not to exceed 5 ug/L (CTR) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
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Guideline Reference: |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Oct 24 2002 to Oct 24 2002 |
Environmental Conditions: |
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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): |
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LOE ID: |
20291 |
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Pollutant: |
Selenium |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Municipal & Domestic Supply |
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Number of Samples: |
1 |
Number of Exceedances: |
0 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
0 of the 1 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Selenium. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
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) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
Selenium levels should not exceed 50 ug/L (Department of Public Health Primary MCL) |
Guideline Reference: |
Compilation of Water Quality Goals |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Oct 24 2002 to Oct 24 2002 |
Environmental Conditions: |
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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 |
7884 |
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Pollutant: |
Specific Conductivity |
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 |
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Weight of Evidence: |
This pollutant is being considered for listing under sections 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Data is available from 1 line 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 0 of 25 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.2 of the Listing Policy. Table 3.2 of the listing policy recommends listing if a sample size of 25 has 5 or more samples that exceed the evaluation criteria. |
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RWQCB Board Decision / Staff Recommendation: |
After review of 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. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 7884 |
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LOE ID: |
20837 |
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Pollutant: |
Specific Conductivity |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
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Beneficial Use: |
Municipal & Domestic Supply |
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Number of Samples: |
25 |
Number of Exceedances: |
0 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: |
0 of the 25 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Specific Conductivity. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
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) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
The water quality objective used was the California Secondary MCL recommended level of 900 uS/cm. The Basin Plan includes chemical constituent water quality objectives that include (by reference) secondary maximum contaminant levels (MCLs) protective of MUN (CVRWQCB, 2007a).The secondary MCLs for electrical conductivity provide a range of values including a recommended level (900 uS/cm), upper level (1600 uS/cm) and a short-term level (2200 uS/cm). The recommended concentration was used as it is intended to be protective of all drinking water uses. |
Guideline Reference: |
Compilation of Water Quality Goals |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Jan 9 2002 to Dec 23 2002 |
Environmental Conditions: |
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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): |
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DECISION ID |
11209 |
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Pollutant: |
Unknown Toxicity |
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 |
|
Weight of Evidence: |
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 1 line 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 0 of 2 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. Table 3.1 of the listing policy recommends listing if a sample size of 2 has 2 or more samples that exceed the evaluation criteria.
The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of 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. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 11209 |
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LOE ID: |
25061 |
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Pollutant: |
Unknown Toxicity |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Cold Freshwater Habitat |
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Number of Samples: |
2 |
Number of Exceedances: |
0 |
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Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Zero of the 2 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Unknown Toxicity-Ceriodaphia dubia. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
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) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
Statistically significant difference from control using a Fishers Exact analysis with 48-hour acute-style toxicity tests. |
Guideline Reference: |
Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012 |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Sep 5 2002 to Oct 24 2002 |
Environmental Conditions: |
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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): |
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DECISION ID |
7881 |
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Pollutant: |
pH |
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 |
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Weight of Evidence: |
This pollutant is being considered for listing under sections 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Data is available from 1 line 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 0 of 25 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.2 of the Listing Policy. Table 3.2 of the listing policy recommends listing if a sample size of 25 has 5 or more samples that exceed the evaluation criteria.
The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
After review of 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. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 7881 |
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LOE ID: |
6385 |
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Pollutant: |
pH |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
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Beneficial Use: |
Cold Freshwater Habitat |
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Number of Samples: |
25 |
Number of Exceedances: |
0 |
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Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
0 of the 25 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for pH. |
Data Reference: |
San Joaquin River SWAMP Monitoring Data - Drainage Basin Inflows |
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Water Quality Objective/Criterion: |
pH levels should not be lower than 6.5 or higher than 8.5 (Basin Plan Objective) |
Objective/Criterion Reference: |
Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
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Evaluation Guideline: |
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Guideline Reference: |
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Spatial Representation: |
Samples were collected at Mokelumne River at Hwy 49. |
Temporal Representation: |
The samples were collected from Jan 9 2002 to Dec 23 2002 |
Environmental Conditions: |
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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): |
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DECISION ID |
6896 |
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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)(2006) |
Revision Status |
Original |
Impairment from Pollutant or Pollution: |
Pollutant |
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Weight of Evidence: |
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. All four samples exceed the water quality criterion.
Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used does not satisfy the data quantity requirements of section 6.1.5 of the Policy.
3. Out of all four annual maximum values, all four were in exceedance of the 21.0°C steelhead annual maximum criterion. However the number of samples is in sufficient to determine if the water quality objective is being met or exceeded. More data is needed to determine if the water quality objective is exceeded.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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RWQCB Board Decision / Staff Recommendation: |
No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed. |
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SWRCB Board Decision / Staff Recommendation: |
This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed. |
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USEPA Decision: |
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Lines of Evidence (LOEs) for Decision ID 6896 |
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LOE ID: |
2735 |
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Pollutant: |
Temperature, water |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Cold Freshwater Habitat |
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Number of Samples: |
4 |
Number of Exceedances: |
4 |
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Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Temperature measurements were taken at 1 monitoring station (MR1) along the Mokelumne River. For this station there were a total of 4 annual maximum temperature values, one for each sampling year, 2000 to 2003. Based on this data, there were a total of 4 annual maximum measurements of which all 4 were in exceedance of the 21.0 degrees C steelhead criteria (PG&E, 2003b). |
Data Reference: |
Placeholder reference 2006 303(d) |
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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. - Central Valley Regional Water Quality Control Boards Water Quality Control Plan (Basin Plan). |
Objective/Criterion Reference: |
Placeholder reference 2006 303(d) |
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Evaluation Guideline: |
The guideline used was from Sullivan et al. (2000) Published Temperature Thresholds-Peer Reviewed Literature which includes reviewed sub-lethal and acute temperature thresholds from a wide range of studies, incorporating information from laboratory-based research, field observations, and risk assessment approaches. This report calculated the Annual Maximum (instantaneous maximum observed during the summer) upper threshold criterion for steelhead trout as 21.0 degrees C. The risk assessment approach used by Sullivan et al. (2000) suggests that an upper threshold for the Annual Maximum of 21.0 degrees C for steelhead will reduce average growth 10% from optimum. |
Guideline Reference: |
Placeholder reference 2006 303(d) |
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Spatial Representation: |
The monitoring station (MR1) was located along the Mokelumne River just upstream of the Electra Powerhouse and downstream of the Ponderosa Bridge. |
Temporal Representation: |
Temperature measurements were taken during years 2000 to 2003. |
Environmental Conditions: |
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QAPP Information: |
QA/QC including 174 page report on Certified Analytical Reports and Chain-of-Custody Documentation. |
QAPP Information Reference(s): |