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DECISION ID |
12776 |
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Pollutant: |
Diazinon |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Agriculture |
Expected TMDL Completion Date: |
2021 |
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 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Two of the samples exceed the water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Two of 6 available 4-day average concentrations exceeded the 4-day average maximum concentration criterion and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. In addition, 3 of 8 available 1-hour average concentrations exceeded the 1-hour average concentration criterion 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. |
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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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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SWRCB Board Decision / Staff Recommendation: |
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USEPA Decision: |
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LOE ID: |
22143 |
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Pollutant: |
Diazinon |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Warm Freshwater Habitat |
Aquatic Life Use: |
Warm Freshwater Habitat |
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Number of Samples: |
4 |
Number of Exceedances: |
0 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Asses Water Quality: |
Four water samples were collected from Live Oak Slough at Nuestro Road biweekly from March through April in 2006, representing four 4-day average concentrations and four 1-hour average concentrations.0 of 4 1-hour average concentrations exceeded the maximum hourly diazinon concentration of 0.160 µg/L.0 of 4 4-day average concentrations exceeded the four day maximum concentration guideline of 0.100 µg/L. |
Data Reference: |
Zipped file of Central Valley Waterways Pesticide TMDL monitoring data spreadsheets and reports |
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Water Quality Objective/Criterion: |
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (CVRWQCB, 2007).All waters shall be maintained free of toxic substances that in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (CVRWQCB, 2007). |
Objective/Criterion Reference: |
Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game |
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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: |
California Fish and Game Hazard Assessment Criteria ¿ 0.160 µg/L 1-hour average and 0.100 µg/L 4-day average concentration (Siepmann and Finlayson, 2000 and Finlayson, 2004). |
Guideline Reference: |
Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game |
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Spatial Representation: |
Samples were collected at Live Oak Slough at Nuestro Road. |
Temporal Representation: |
Samples were collected biweekly from March through April 2006. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Excellent. Calanchini, H. 2006. Quality Assurance Project Plan, Sacramento and San Joaquin River Basins and Sacramento-San Joaquin Delta TMDL Monitoring for Organophosphorus Pesticides and Other Pesticides Identified as Posing a High Risk to Surface Waters. John Muir Institute of the Environment, U.C. Davis. Davis, CA. |
QAPP Information Reference(s): |
Quality Assurance Project Plan. Sacramento and San Joaquin River Basins and Sacramento-San Joaquin Delta TMDL Monitoring for Organophosphorus Pesticides and Other Pesticides Identified as Posing a High Risk to Surface Waters. Final. SWAMP Project ID 02TM5001 (Revision 0.0). John Muir Institute of the Environment, U.C. Davis. Davis, CA. January 26, 2006 |
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LOE ID: |
22142 |
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Pollutant: |
Diazinon |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Warm Freshwater Habitat |
Aquatic Life Use: |
Warm Freshwater Habitat |
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Number of Samples: |
2 |
Number of Exceedances: |
2 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Asses Water Quality: |
Four water samples were collected from Live Oak Slough during two winter storms in 2006, representing two 4-day average concentrations and 4 1-hour average concentrations.3 of 4 1-hour average concentrations exceeded the maximum hourly diazinon concentration of 0.160 µg/L2 of 2 4-day average concentrations exceeded the four day maximum concentration guideline of 0.100 µg/L. |
Data Reference: |
Zipped file of Central Valley Waterways Pesticide TMDL monitoring data spreadsheets and reports |
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Water Quality Objective/Criterion: |
No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses (CVRWQCB, 2007).All waters shall be maintained free of toxic substances that in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life (CVRWQCB, 2007). |
Objective/Criterion Reference: |
Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game |
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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: |
California Fish and Game Hazard Assessment Criteria ¿ 0.160 µg/L 1-hour average and 0.100 µg/L 4-day average concentration (Siepmann and Finlayson, 2000 and Finlayson, 2004). |
Guideline Reference: |
Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game |
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Spatial Representation: |
Samples were collected at Live Oak Slough at Nuestro Road. |
Temporal Representation: |
Samples were collected at daily intervals during two storm events in 2006. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Excellent. Calanchini, H. 2006. Quality Assurance Project Plan, Sacramento and San Joaquin River Basins and Sacramento-San Joaquin Delta TMDL Monitoring for Organophosphorus Pesticides and Other Pesticides Identified as Posing a High Risk to Surface Waters. John Muir Institute of the Environment, U.C. Davis. Davis, CA. |
QAPP Information Reference(s): |
Quality Assurance Project Plan. Sacramento and San Joaquin River Basins and Sacramento-San Joaquin Delta TMDL Monitoring for Organophosphorus Pesticides and Other Pesticides Identified as Posing a High Risk to Surface Waters. Final. SWAMP Project ID 02TM5001 (Revision 0.0). John Muir Institute of the Environment, U.C. Davis. Davis, CA. January 26, 2006 |
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DECISION ID |
14390 |
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Pollutant: |
Oxyfluorfen |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Agriculture |
Expected TMDL Completion Date: |
2021 |
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 3.1 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. Two of the samples exceed the water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Two of 8 water samples exceed the oxyfluorfenEvaluation Guideline value of 0.29 (the 96-hour EC50 for Selenastrum capricornutum, a green algae), and this exceeds the narrative toxicity objective and, therefore, 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. |
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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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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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 14390 |
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LOE ID: |
26108 |
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Pollutant: |
Oxyfluorfen |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Warm Freshwater Habitat |
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Number of Samples: |
8 |
Number of Exceedances: |
2 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Asses Water Quality: |
Eight water samples were collected from Gilsizer Slough from January to July 2006 for the Pesticide TMDL program.
Two of the 8 samples had oxyfluorfen concentrations that exceeded the Evaluation Guideline of 0.29 µg/L. |
Data Reference: |
Zipped file of Central Valley Waterways Pesticide TMDL monitoring data spreadsheets and reports |
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Water Quality Objective/Criterion: |
No individual pesticide or combination of pesticides shall be present in concentrations 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. |
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: |
Where valid testing has developed 96 hour LC50 values for aquatic organisms (the concentration that kills one half of the test organisms in 96 hours), 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. Other available technical information on the pesticide (such as Lowest Observed Effect Concentrations and No Observed Effect Levels), the water bodies and the organisms involved will be evaluated to determine if lower concentrations are required to meet the narrative objectives (CVRWQCB, 2007). The 96-hour EC50 value for oxyfluorfen for the most sensitive freshwater species tested (Green algae, Selenastrum capricornutum) is 0.29 µg/L. |
Guideline 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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Ecotoxicity database. U.S. Environmental Protection Agency, Office of Pesticide Programs |
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Spatial Representation: |
Water samples were collected from Live Oak Slough at Nuestro Road. |
Temporal Representation: |
Water samples were collected daily during two storms in February 2006, and weekly in July 2006. |
Environmental Conditions: |
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QAPP Information: |
Data Quality: Good. All sampling, analysis and QA/QC protocols are described in Calanchini (2006). |
QAPP Information Reference(s): |
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DECISION ID |
9665 |
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Pollutant: |
Oxygen, Dissolved |
Final Listing Decision: |
List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
New Decision |
Revision Status |
Revised |
Sources: |
Source Unknown |
Expected TMDL Completion Date: |
2021 |
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 sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 11 of 15 available concentrations exceeded the water quality objective and this does exceed the allowable frequency using Table 3.2 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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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 9665 |
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LOE ID: |
21124 |
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Pollutant: |
Oxygen, Dissolved |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
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Beneficial Use: |
Cold Freshwater Habitat |
Aquatic Life Use: |
Cold Freshwater Habitat |
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Number of Samples: |
15 |
Number of Exceedances: |
11 |
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Data and Information Type: |
PHYSICAL/CHEMICAL MONITORING |
Data Used to Asses Water Quality: |
11 of the 15 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Dissolved Oxygen. |
Data Reference: |
SWAMP data entered by SWRCB into BDAT database |
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Water Quality Objective/Criterion: |
The Basin Plan Objective sets the minimum Dissolved Oxygen content at 7 mg/L |
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 Live Oak Slough @ Clark Road. |
Temporal Representation: |
The samples were collected from Dec 7 2000 to Jul 30 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): |