Water Body Name: | Mariposa Creek (Mariposa and Merced Counties) |
Water Body ID: | CAR5380006220101117154615 |
Water Body Type: | River & Stream |
DECISION ID |
92202 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Alachlor |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the 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.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the water quality criteria for MUN, and zero of the four samples exceed the evaluation guideline for WARM. 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. Zero of the four samples exceed the water quality criteria for MUN, and zero of the four samples exceed the evaluation guideline for WARM 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 are 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. |
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LOE ID: | 66779 | ||||
Pollutant: | Alachlor | ||||
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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the objective (2 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The California primary maximum contaminant level for alachlor is 2 ug/L. | ||||
Objective/Criterion Reference: | Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
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LOE ID: | 66778 | ||||
Pollutant: | Alachlor | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline value of 1.64 ug/L. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Tulare Lake Basin) | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the Tulare Lake Basin Second Edition. rev. Jan 2004 | ||||
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 Alachlor, 1.64 ug/L, is the EC50 for Selenastrum capricornutum (Green algae); USEPA Office of Pesticide Programs Ecotoxicity database. | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67857 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Atrazine |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a two line(s) of evidence are necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the MUN water quality objective, zero of the four samples exceed the WARM evaluation guideline. 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. Zero of four samples exceed the MUN water quality objective, zero of four samples exceed the WARM 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. |
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LOE ID: | 66780 | ||||
Pollutant: | Atrazine | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (43 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Atrazine, 43 ug/L, is a an EC50 for Lemna gibba (duckweed); USEPA Office of Pesticide Programs Ecotoxicity database. | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
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LOE ID: | 66781 | ||||
Pollutant: | Atrazine | ||||
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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the objective (1 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The California Maximum Contaminant Level for atrazine is 0.001 mg/L (Title 22 of the California Code of Regulations ). | ||||
Objective/Criterion Reference: | Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67858 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Bromacil |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1a one line(s) of evidence are necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. Zero of the four samples exceed the Evaluation Guideline. 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. Zero of four samples exceeded 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. |
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LOE ID: | 66782 | ||||
Pollutant: | Bromacil | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (45 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
Evaluation Guideline: | The EC50 for bromacil for Lemna gibba (duckweed) is 45 ug/L (USEPA Office of Pesticide Programs Ecotoxicity database). | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67889 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Dimethoate |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1a one line(s) of evidence are necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. Zero of the zero samples exceed the Evaluation Guideline. 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. Zero of zero samples exceeded 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. |
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LOE ID: | 66783 | ||||
Pollutant: | Dimethoate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 0 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | A total of 4 individual whole water samples were collected; 0 of 4 samples were below the reporting limit (10 ug/L) but the reporting limit exceeded the evaluation guideline (4.3 ug/L); the samples were not counted in the assessment because they could not be quantified with the certainty required by the listing policy. 0 of 0 samples exceeded the evaluation guideline. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 dimethoate, 4.3 ug/L, is one-tenth of the median lethal concentration (LC50 = 43 ug/L) for Pteronarcys californica (Stonefly); USEPA Office of Pesticide Programs Ecotoxicity database. | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67848 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Diuron |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1a one line(s) of evidence are necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. Zero of the four samples exceed the Evaluation Guideline. 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. Zero of four samples exceeded 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. |
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LOE ID: | 78538 | ||||
Pollutant: | Diuron | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | State Water Board staff assessed ILRP data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Diuron. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: 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. 4th ed | ||||
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..." Aquatic life should not be affected unacceptably if the 4-day average concentration of Diuron, 1.3 ug/L, is not exceeded more than once every three years on the average (UC Davis Aquatic Life Criterion). | ||||
Guideline Reference: | Aquatic life water quality criteria derived via the UC Davis method: III. Diuron. Reviews of Environmental Contamination and Toxicology 216:105-141. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [ Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | none | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67849 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Glyphosate |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a two line(s) of evidence are necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the MUN water quality objective, zero of the four samples exceed the WARM water evaluation guideline. 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. Zero of four samples exceed the MUN water quality objective, zero of four samples exceed the WARM water 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. |
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LOE ID: | 66786 | ||||
Pollutant: | Glyphosate | ||||
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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (700 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The California primary maximum contaminant level for Glyphosate is 700 ug/L. | ||||
Objective/Criterion Reference: | Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
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|||||
LOE ID: | 66785 | ||||
Pollutant: | Glyphosate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (5500 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 glyphosate, 5,500 ug/L, is one-tenth of the median lethal concentration (LC50 = 55,000 ug/L) for Chironimus plumosus (Midge). (USEPA Office of Pesticide Programs Ecotoxicity database) | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
91948 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Metolachlor |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the 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.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the evaluation guideline for MUN, and zero of the four samples exceed the evaluation guideline for WARM. 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. Zero of the four samples exceed the evaluation guideline for MUN, and zero of the four samples exceed the evaluation guideline for WARM 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 are 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. |
|
|||||
LOE ID: | 66787 | ||||
Pollutant: | Metolachlor | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (100 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Metolachlor, 10 ug/L, is an EC50 for Selenastrum capricornutum (Green algae); USEPA Office of Pesticide Programs Ecotoxicity database. | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 66788 | ||||
Pollutant: | Metolachlor | ||||
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 Ag Waiver data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Metolachlor. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
Evaluation Guideline: | The National Ambient Water Quality criterion for Human Health and Welfare Protection of Public Health Effects (other than cancer effects) from Water & Fish Consumption for metolachlor is 44 µg/L. | ||||
Guideline Reference: | National Recommended Water Quality Criteria. United States Environmental Protection Agency. Office of Water. Office of Science and Technology | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67853 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Metribuzin |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1a one line(s) of evidence are necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. Zero of the four samples exceed the Evaluation Guideline. 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. Zero of four samples exceeded 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. |
|
|||||
LOE ID: | 66789 | ||||
Pollutant: | Metribuzin | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (8.09 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Metribuzin, 8.09 ug/L, is an EC50 for Selenastrum capricornutum (Green algae). (USEPA Office of Pesticide Programs Ecotoxicity database) | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
91998 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Molinate |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the 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.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the water quality criteria for MUN, and zero of the four samples exceed the evaluation guideline for WARM. 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. Zero of the four samples exceed the water quality criteria for MUN, and zero of the four samples exceed the evaluation guideline for WARM 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 are 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. |
|
|||||
LOE ID: | 66791 | ||||
Pollutant: | Molinate | ||||
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 Ag Waiver data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Molinate. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The California primary maximum contaminant level for Molinate is 20 ug/L . | ||||
Objective/Criterion Reference: | Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 66790 | ||||
Pollutant: | Molinate | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Molinate, 600 ug/L, the maximum acceptable toxicicant concentration (MATC) for Daphnia magna (Water flea). (USEPA Office of Pesticide Programs Ecotoxicity database) | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
92282 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Oxygen, Dissolved |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 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. Zero of the five samples exceed the water quality criteria. 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 the five samples exceed the water quality criteria 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 26 samples are needed to determine if a beneficial use is fully supported using table 3.2. 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. |
|
|||||
LOE ID: | 66792 | ||||
Pollutant: | Oxygen, Dissolved | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
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 Ag Waiver data to determine beneficial use support: None of five sample results exceed the criterion for Oxygen, Dissolved. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | 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) | ||||
Objective/Criterion Reference: | Water Quality Control Plan for the Tulare Lake Basin Second Edition. rev. Jan 2004 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence was collected at one monitoring site [Mariposa Creek at Fancher Lateral-545MRDFLH]. | ||||
Temporal Representation: | Data was collected on two dates each in 2007 and 2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67854 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Prodiamine |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1a one line(s) of evidence are necessary to assess listing status.
One line of evidence is available in the administrative record to assess this pollutant. Zero of the two samples exceed the Evaluation Guideline. 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. Zero of two samples exceeded 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. |
|
|||||
LOE ID: | 66793 | ||||
Pollutant: | Prodiamine | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 2 | ||||
Number of Exceedances: | 0 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | A total of 2 individual whole water samples were collected; 0 of 2 samples exceeded the evaluation guideline (17 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Prodiamine, 17 ug/L, is a maximum acceptable toxicicant concentration (MATC) calculated for Oncorhyncus mykiss (Rainbow trout). USEPA Office of Pesticide Programs Ecotoxicity database) | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 7/30/2008-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
67863 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Simazine |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 a two line(s) of evidence are necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the MUN water quality objective, zero of the four samples exceed the WARM water evaluation guideline. 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. Zero of four samples exceed the MUN water quality objective, zero of four samples exceed the WARM water 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. |
|
|||||
LOE ID: | 66798 | ||||
Pollutant: | Simazine | ||||
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 Ag Waiver data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Simazine. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The California primary maximum contaminant level for Simazine is 4 ug/L. | ||||
Objective/Criterion Reference: | Maximum Contaminant Levels for organic and inorganic chemicals. CCR Title 22 | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 66797 | ||||
Pollutant: | Simazine | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (90 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Simazine, 90 ug/L, is the EC50 for Navicula pelliculosa (freshwater diatom). (USEPA Office of Pesticide Programs Ecotoxicity database) | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
92283 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
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)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 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. Zero of the five samples exceed the water quality criteria. 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 the five samples exceed the water quality criteria 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 26 samples are needed to determine if a beneficial use is fully supported using table 3.2. 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. |
|
|||||
LOE ID: | 66784 | ||||
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 Ag Waiver data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 5 samples exceed the criterion for Conductivity(Us). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | The California secondary maximum contaminant levels for electrical conductivity provide a range of values including a recommended level (900 uS/cm), an upper level (1,600 uS/cm) and a short-term level (2,200 uS/cm). The recommended level of 900 uS/cm was used as it is protective of all drinking water uses. | ||||
Objective/Criterion Reference: | Secondary Maximum Contaminant Levels and Compliance. CCR Title 22 section 64449. | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
77525 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
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)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 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. Three of the five samples exceed the evaluation guideline. 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. Three of the five samples exceed 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 26 samples are needed to determine if a beneficial use is fully supported using table 3.2. 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. |
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LOE ID: | 66799 | ||||
Pollutant: | Temperature, water | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Cold Freshwater Habitat | ||||
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 Ag Waiver data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 3 of 5 samples exceed the criterion for Water Temperature. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | 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 Juoaquin 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. 4th ed | ||||
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: | Inland Fishes of California (1976) | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
92207 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
Pollutant: | Thiobencarb/Bolero |
Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the 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.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of the four samples exceed the water quality objective for MUN, and zero of the four samples exceed the evaluation guideline for WARM. 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. Zero of the four samples exceed the water quality objective for MUN, and zero of the four samples exceed the evaluation guideline for WARM 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 are 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. |
|
|||||
LOE ID: | 66801 | ||||
Pollutant: | Thiobencarb/Bolero | ||||
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 Ag Waiver data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Thiobencarb. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Waters designated for use as domestic or municipal supply (MUN) shall not contain concentrations of Thiobencarb in excess of 1.0 µg/L. (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. 4th ed | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
|
|||||
LOE ID: | 66800 | ||||
Pollutant: | Thiobencarb/Bolero | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial 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: | A total of 4 individual whole water samples were collected; 0 of 4 samples exceeded the evaluation guideline (1.4 ug/L). | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (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. 4th ed | ||||
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 Thiobencarb, 1.4 ug/L, is a maximum acceptable toxicicant concentration (MATC) calculated for Daphnia magna (Water flea). (USEPA Office of Pesticide Programs Ecotoxicity database) | ||||
Guideline Reference: | OPP Pesticide Ecotoxicity Database. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | Data for this line of evidence was collected as part of the Irrigated Lands Regulatory Program. | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
92396 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
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)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 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. Zero of the four 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 the four samples exceed 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 26 samples are needed to determine if a beneficial use is fully supported using table 3.2. 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. |
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LOE ID: | 78528 | ||||
Pollutant: | Total Dissolved Solids | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | Dissolved | ||||
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: | State Water Board staff assessed ILRP data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 0 of 4 samples exceed the criterion for Dissolved Solids. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-SWAMP | ||||
Water Quality Objective/Criterion: | Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: At a minimum, water designated for MUN shall not contain concentrations of chemical constituents in excess of the MCL specified in Title 22 of the California Code of Regulations. The secondary MCL for Total Dissolved Solids is 500 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. 4th ed | ||||
Evaluation Guideline: | |||||
Guideline Reference: | |||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [ Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | none | ||||
QAPP Information Reference(s): | |||||
DECISION ID |
77523 |
Region 5 |
Mariposa Creek (Mariposa and Merced Counties) |
||
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)(2016) |
Revision Status | Original |
Impairment from Pollutant or Pollution: | Pollutant |
Regional Board Conclusion: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 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. One 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. One of the five samples exceed 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 26 samples are needed to determine if a beneficial use is fully supported using table 3.2. 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. |
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LOE ID: | 78539 | ||||
Pollutant: | pH | ||||
LOE Subgroup: | Pollutant-Water | ||||
Matrix: | Water | ||||
Fraction: | None | ||||
Beneficial Use: | Warm Freshwater Habitat | ||||
Number of Samples: | 5 | ||||
Number of Exceedances: | 1 | ||||
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
Data Used to Assess Water Quality: | State Water Board staff assessed ILRP data for Mariposa Creek (Mariposa and Merced Counties) to determine beneficial use support and results are as follows: 1 of 5 samples exceed the criterion for pH. | ||||
Data Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
SWAMP Data: | Non-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. 4th ed | ||||
Evaluation Guideline: | |||||
Guideline Reference: | Data for Various Pollutants in Merced Irrigation District, 2005-2008. | ||||
Spatial Representation: | Data for this line of evidence for Mariposa Creek (Mariposa and Merced Counties) was collected at 1 monitoring site [ Mariposa Creek at Fancher Lateral - 545MRDFLH] | ||||
Temporal Representation: | Data was collected over the time period 8/1/2007-9/16/2008. | ||||
Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
QAPP Information: | none | ||||
QAPP Information Reference(s): | |||||