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DECISION ID |
12621 |
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Pollutant: |
Unknown Toxicity |
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 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.
Three lines of evidence are available in the administrative record to assess this pollutant. Five 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. Five of 10 samples tested with selenastrum exceed the narrative toxicity objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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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: |
23028 |
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Pollutant: |
Toxicity |
LOE Subgroup: |
Toxicity |
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: |
9 |
Number of Exceedances: |
0 |
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Data and Information Type: |
TOXICITY TESTING |
Data Used to Assess Water Quality: |
Zero of the 9 samples tested with Ceriodaphnia dubia were toxic and violated the narrative toxicity objective. |
Data Reference: |
Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program |
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Monitoring and Reporting Program, Order Nos. R5-2003-0826, R5-2005-0833, and R5-2008-0005 for Coalition Groups Under Resolution No. R5-2003-0105, Conditional Waiver of Waste Discharge Requirements for Discharges From Irrigated Lands Within the Central Valley Region |
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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. (CVRWQCB, 2007) |
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 t-test with 4-day acute-style toxicity tests. |
Guideline Reference: |
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Spatial Representation: |
Samples were collected from Mormon Slough at Jack Tone Road. |
Temporal Representation: |
Samples were collected from July 2004 to September 2006 |
Environmental Conditions: |
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QAPP Information: |
Data quality: Excellent. 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): |
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LOE ID: |
23031 |
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Pollutant: |
Toxicity |
LOE Subgroup: |
Toxicity |
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: |
9 |
Number of Exceedances: |
0 |
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Data and Information Type: |
TOXICITY TESTING |
Data Used to Assess Water Quality: |
Zero of the 9 samples tested with Pimephales promelas were toxic and violated the narrative toxicity objective. |
Data Reference: |
Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program |
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Monitoring and Reporting Program, Order Nos. R5-2003-0826, R5-2005-0833, and R5-2008-0005 for Coalition Groups Under Resolution No. R5-2003-0105, Conditional Waiver of Waste Discharge Requirements for Discharges From Irrigated Lands Within the Central Valley Region |
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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. (CVRWQCB, 2007) |
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 t-test with 4-day acute-style toxicity tests. |
Guideline Reference: |
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Spatial Representation: |
Samples were collected from Mormon Slough at Jack Tone Road. |
Temporal Representation: |
Samples were collected from July 2004 to September 2006. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Excellent. 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): |
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LOE ID: |
23046 |
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Pollutant: |
Toxicity |
LOE Subgroup: |
Toxicity |
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: |
10 |
Number of Exceedances: |
5 |
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Data and Information Type: |
TOXICITY TESTING |
Data Used to Assess Water Quality: |
Five of 10 samples tested with Selenastrum capricornutum were toxic and violated the narrative toxicity objective. Five samples collected at Jack Tone Road exhibited a statistically significant decrease in growth compared to the control. The sample dates and percent of control (in parentheses) are as follows:14 July 2004 (71)28 July 2004 (55)11 August 2004 (63)25 August 2004 (68)08 September 2004 (64) |
Data Reference: |
Revised Draft of the 2007 Review of the Monitoring Data for the Irrigated Lands Regulatory Conditional Waiver Program |
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Monitoring and Reporting Program, Order Nos. R5-2003-0826, R5-2005-0833, and R5-2008-0005 for Coalition Groups Under Resolution No. R5-2003-0105, Conditional Waiver of Waste Discharge Requirements for Discharges From Irrigated Lands Within the Central Valley Region |
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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. (CVRWQCB, 2007) |
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 t-test with 4-day chronic-style toxicity tests. |
Guideline Reference: |
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Spatial Representation: |
Samples were collected from Mormon Slough at Jack Tone Road. |
Temporal Representation: |
Samples were collected from July 2004 to September 2006. |
Environmental Conditions: |
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QAPP Information: |
Data quality: Excellent. 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): |
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DECISION ID |
4337 |
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Pollutant: |
Methyl Tertiary-Butyl Ether (MTBE) |
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 3.1 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. One sample 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. One of 2 samples exceeded the Primary MCLs Title 22 Table 6444-A and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
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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 4337 |
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LOE ID: |
2684 |
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Pollutant: |
Methyl Tertiary-Butyl Ether (MTBE) |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Total |
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Beneficial Use: |
Municipal & Domestic Supply |
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Number of Samples: |
2 |
Number of Exceedances: |
1 |
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Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Two samples were collected; 1 sample exceeded the Primary MCL Objective. (Calaveras River Baseline Water Quality Sampling Project, 2004) |
Data Reference: |
Placeholder reference 2006 303(d) |
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Water Quality Objective/Criterion: |
Primary MCLs Title 22 Table 6444-A |
Objective/Criterion Reference: |
Placeholder reference 2006 303(d) |
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Evaluation Guideline: |
Primary MCL - 0.013 ppm |
Guideline Reference: |
Placeholder reference 2006 303(d) |
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Spatial Representation: |
Samples were taken at the following site: L-CAL-1. |
Temporal Representation: |
Samples were collected on 5/29/03 and 9/1/03. |
Environmental Conditions: |
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QAPP Information: |
Data is supported by a Quality Assurance Project Plan (QAPP) pursuant to the requirements of 40 CFR 31.45 and are acceptable for use in developing the section 303(d) list. |
QAPP Information Reference(s): |