| Water Body Name: | Walnut Creek |
| Water Body ID: | CAR2073104019990218110904 |
| Water Body Type: | River & Stream |
DECISION ID |
33647 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Diazinon |
| Final Listing Decision: | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (being addressed by USEPA approved TMDL)(2012) |
| Revision Status | Revised |
| Sources: | Source Unknown |
| TMDL Name: | San Francisco Bay Urban Creeks Diazinon |
| TMDL Project Code: | 9 |
| Date TMDL Approved by USEPA: | 05/16/2007 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | his pollutant is being considered for removal on the CWA section 303(d) List under sections 2.2 and 4.1 of the Listing Policy. Under 4.1 of the Policy, a minimum of one line of evidence is needed to assess listing status.
Three lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA, and is expected to result in attainment of the standard. 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. A product ban for urban uses of diazinon in 1999 which has caused dramatic reduction in use. 4. Zero of one recent samples (since the ban) exceeded the evaluation guideline. 5. However, there are not a sufficient number of samples to de-list this waterbody according to Table 4.1 of the Listing Policy. 6. The Pesticides in Urban Creeks TMDL was approved by USEPA on 5/21/2007. 7. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded. |
|
|||||
| LOE ID: | 1833 | ||||
| Pollutant: | Diazinon | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 0 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | |||||
| Objective/Criterion Reference: | |||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | |||||
| Temporal Representation: | |||||
| Environmental Conditions: | |||||
| QAPP Information: | QA Info Missing | ||||
| QAPP Information Reference(s): | |||||
|
|||||
| LOE ID: | 93531 | ||||
| Pollutant: | Diazinon | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Diazinon. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for diazinon is the median lethal concentration (LC50) of 11 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 11 ug/g is the geometric mean of LC50 values for diazinon from Ding et al. (2011). | ||||
| Guideline Reference: | Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83?92. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93530 | ||||
| Pollutant: | Diazinon | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Diazinon. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for diazinon is the median lethal concentration (LC50) of 11 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 11 ug/g is the geometric mean of LC50 values for diazinon from Ding et al. (2011). | ||||
| Guideline Reference: | Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83?92. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65826 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Anthracene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
One line of evidence is available in the administrative record to assess this pollutant. Zero of one sample exceeds the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
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| LOE ID: | 93467 | ||||
| Pollutant: | Anthracene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Anthracene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for anthracene is 845 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93468 | ||||
| Pollutant: | Anthracene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Anthracene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for anthracene is 845 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65827 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Arsenic |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
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| LOE ID: | 93469 | ||||
| Pollutant: | Arsenic | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Arsenic. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93470 | ||||
| Pollutant: | Arsenic | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Arsenic. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for arsenic is 33 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65828 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Benzo(a)anthracene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93479 | ||||
| Pollutant: | Benzo(a)anthracene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Benzo(a)anthracene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for Benzo(a)anthracene is 1050 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93480 | ||||
| Pollutant: | Benzo(a)anthracene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Benzo(a)anthracene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for Benzo(a)anthracene is 1050 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65829 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Benzo(a)pyrene (3,4-Benzopyrene -7-d) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93481 | ||||
| Pollutant: | Benzo(a)pyrene (3,4-Benzopyrene -7-d) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Benzo(a)pyrene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Benzo(a)Pyrene is 1450 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93482 | ||||
| Pollutant: | Benzo(a)pyrene (3,4-Benzopyrene -7-d) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Benzo(a)pyrene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Benzo(a)Pyrene is 1450 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65830 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Bifenthrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93492 | ||||
| Pollutant: | Bifenthrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Bifenthrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for bifenthrin is the median lethal concentration (LC50) of 0.43 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396. | |||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93483 | ||||
| Pollutant: | Bifenthrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Bifenthrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for bifenthrin is the median lethal concentration (LC50) of 0.43 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.43 ug/g is the geometric mean of LC50 values for bifenthrin from Amweg et al. (2005) and Amweg and Weston (2007). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396. | |||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65831 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Cadmium |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93493 | ||||
| Pollutant: | Cadmium | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cadmium. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93494 | ||||
| Pollutant: | Cadmium | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cadmium. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for cadmium is 4.98 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65907 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Chlordane |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
One line of evidence is available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 90709 | ||||
| Pollutant: | Chlordane | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Zero of 1 samples collected exceeded the criteria for chlordane concentration (Sum of trans-Chlordane, cis-Chlordane, cis-Nonachlor, trans-Nonachlor, and Oxychlordane). | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that are lethal to or that produce other detrimental responses in aquatic organisms. Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses. (Water Quality Control Plan for the San Francisco Bay Basin). | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) - San Francisco Bay Region (Region 2) | ||||
| Evaluation Guideline: | The Probable Effect Concentration for Chlordane in freshwater sediments is 17.6 ug/kg(MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data were collected at the following station 207WAL020 (Walnut Creek @ Concord Ave O.C.). | ||||
| Temporal Representation: | The samples were collected on 6/17/2008. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The SWAMP QAPP (2008) was followed. | ||||
| QAPP Information Reference(s): | Surface Water Ambient Monitoring Program Quality Assurance Program Plan | ||||
DECISION ID |
65832 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Chlorpyrifos |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93496 | ||||
| Pollutant: | Chlorpyrifos | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlorpyrifos. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007). | ||||
| Guideline Reference: | Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93495 | ||||
| Pollutant: | Chlorpyrifos | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chlorpyrifos. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for chlorpyrifos is the median lethal concentration (LC50) of 1.77 ug/g and is normalized by the percentage of organic carbon in the sediment sample (Amweg and Weston, 2007). | ||||
| Guideline Reference: | Whole-sediment toxicity identification evaluation tools for pyrethroid insecticides: I. piperonyl butoxide addition. Environ. Toxicol. Chem. 26:2389-2396. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65833 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Chromium |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93506 | ||||
| Pollutant: | Chromium | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chromium. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93505 | ||||
| Pollutant: | Chromium | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chromium. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for chromium is 111 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65834 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Chrysene (C1-C4) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93507 | ||||
| Pollutant: | Chrysene (C1-C4) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chrysene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Chrysene is 1290 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93508 | ||||
| Pollutant: | Chrysene (C1-C4) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Chrysene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Chrysene is 1290 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65835 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Copper |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93509 | ||||
| Pollutant: | Copper | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Copper. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93513 | ||||
| Pollutant: | Copper | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Copper. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for copper is 149 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65836 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Cyfluthrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93515 | ||||
| Pollutant: | Cyfluthrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cyfluthrin, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for cyfluthrin is the median lethal concentration (LC50) of 1.1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93514 | ||||
| Pollutant: | Cyfluthrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cyfluthrin, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for cyfluthrin is the median lethal concentration (LC50) of 1.1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.1 ug/g is the geometric mean of LC50 values for cyfluthrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65837 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Cyhalothrin, Lambda |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93516 | ||||
| Pollutant: | Cyhalothrin, Lambda | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cyhalothrin, lambda, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for lambda-cyhalothrin is the median lethal concentration (LC50) of 0.44 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93517 | ||||
| Pollutant: | Cyhalothrin, Lambda | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cyhalothrin, lambda, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for lambda-cyhalothrin is the median lethal concentration (LC50) of 0.44 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.44 ug/g is the geometric mean of LC50 values for lambda-cyhalothrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65838 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Cypermethrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93520 | ||||
| Pollutant: | Cypermethrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cypermethrin, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002). | ||||
| Guideline Reference: | Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93519 | ||||
| Pollutant: | Cypermethrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Cypermethrin, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for cypermethrin is the median lethal concentration (LC50) of 0.3 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.3 ug/g is the geometric mean of LC50 values for cypermethrin from Maund et al. (2002). | ||||
| Guideline Reference: | Partitioning, bioavailability, and toxicity of the pyrethroid insecticide cypermethrin in sediments. Environmental Toxicology and Chemistry 21:9-15 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65839 |
Region 2 |
Walnut Creek |
||
| Pollutant: | DDD (Dichlorodiphenyldichloroethane) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93521 | ||||
| Pollutant: | DDD (Dichlorodiphenyldichloroethane) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDD. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for sum of DDD is 28.0 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93522 | ||||
| Pollutant: | DDD (Dichlorodiphenyldichloroethane) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDD. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for sum of DDD is 28.0 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65840 |
Region 2 |
Walnut Creek |
||
| Pollutant: | DDE (Dichlorodiphenyldichloroethylene) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93524 | ||||
| Pollutant: | DDE (Dichlorodiphenyldichloroethylene) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDE. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for sum of DDE is 31.3 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93523 | ||||
| Pollutant: | DDE (Dichlorodiphenyldichloroethylene) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDE. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for sum of DDE is 31.3 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65841 |
Region 2 |
Walnut Creek |
||
| Pollutant: | DDT (Dichlorodiphenyltrichloroethane) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Four lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93525 | ||||
| Pollutant: | DDT (Dichlorodiphenyltrichloroethane) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for sum of DDT is 62.9 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93600 | ||||
| Pollutant: | Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT, Total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for total DDTs is 572 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93526 | ||||
| Pollutant: | DDT (Dichlorodiphenyltrichloroethane) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for sum of DDT is 62.9 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93610 | ||||
| Pollutant: | Total DDT (sum of 4,4'- and 2,4'- isomers of DDT, DDE, and DDD) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for DDT, Total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for total DDTs is 572 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65842 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Deltamethrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93528 | ||||
| Pollutant: | Deltamethrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Deltamethrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for deltamethrin is the median lethal concentration (LC50) of 0.79 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93527 | ||||
| Pollutant: | Deltamethrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Deltamethrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for deltamethrin is the median lethal concentration (LC50) of 0.79 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 0.79 ug/g is the geometric mean of LC50 values for deltamethrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65843 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Dieldrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93533 | ||||
| Pollutant: | Dieldrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Dieldrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93532 | ||||
| Pollutant: | Dieldrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Dieldrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for dieldrin is 61.8 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65844 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Endrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93536 | ||||
| Pollutant: | Endrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93534 | ||||
| Pollutant: | Endrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Endrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for endrin is 207 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65845 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Esfenvalerate/Fenvalerate |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93538 | ||||
| Pollutant: | Esfenvalerate/Fenvalerate | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Esfenvalerate/Fenvalerate, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93537 | ||||
| Pollutant: | Esfenvalerate/Fenvalerate | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Esfenvalerate/Fenvalerate, total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for esfenvalerate/fenvalerate is the median lethal concentration (LC50) of 1.5 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1.5 ug/g is the geometric mean of LC50 values for esfenvalerate/fenvalerate from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65897 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Fenpropathrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93540 | ||||
| Pollutant: | Fenpropathrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Fenpropathrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for fenpropathrin is the median lethal concentration (LC50) of 1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011). | ||||
| Guideline Reference: | Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83?92. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93539 | ||||
| Pollutant: | Fenpropathrin | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Fenpropathrin. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for fenpropathrin is the median lethal concentration (LC50) of 1 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 1 ug/g is the geometric mean of LC50 values for fenpropathrin from Ding et al. ( 2011). | ||||
| Guideline Reference: | Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83?92. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65898 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Fluoranthene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93545 | ||||
| Pollutant: | Fluoranthene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Fluoranthene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Fluoranthene is 2,230 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93544 | ||||
| Pollutant: | Fluoranthene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Fluoranthene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Fluoranthene is 2,230 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65899 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Fluorene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93547 | ||||
| Pollutant: | Fluorene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Fluorene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for fluorene is 536 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93546 | ||||
| Pollutant: | Fluorene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Fluorene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for fluorene is 536 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65900 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Lead |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93556 | ||||
| Pollutant: | Lead | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Lead. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for lead is 128 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93548 | ||||
| Pollutant: | Lead | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Lead. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for lead is 128 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65901 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93558 | ||||
| Pollutant: | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for HCH, gamma. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93557 | ||||
| Pollutant: | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for HCH, gamma. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for Lindane (gamma-HCH) is 4.99 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65902 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Mercury |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93559 | ||||
| Pollutant: | Mercury | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Mercury. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for mercury is 1.06 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93560 | ||||
| Pollutant: | Mercury | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Mercury. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for mercury is 1.06 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65903 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Methyl Parathion |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93570 | ||||
| Pollutant: | Methyl Parathion | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Parathion, Methyl. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for methyl parathion is the median lethal concentration (LC50) of 6 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 6 ug/g is the geometric mean of LC50 values for methyl parathion from Ding et al. (2011). | ||||
| Guideline Reference: | Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83?92. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93571 | ||||
| Pollutant: | Methyl Parathion | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Parathion, Methyl. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for methyl parathion is the median lethal concentration (LC50) of 6 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 6 ug/g is the geometric mean of LC50 values for methyl parathion from Ding et al. (2011). | ||||
| Guideline Reference: | Toxicity of Sediment-Associated Pesticides to Chironomus dilutus and Hyalella azteca. Arch. Environ. Contam. Toxicol. 61:83?92. | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65904 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Naphthalene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93572 | ||||
| Pollutant: | Naphthalene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Naphthalene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for naphthalene is 561 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93573 | ||||
| Pollutant: | Naphthalene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Naphthalene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for naphthalene is 561 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65905 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Nickel |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93574 | ||||
| Pollutant: | Nickel | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 1 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceed the criterion for Nickel. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93583 | ||||
| Pollutant: | Nickel | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 1 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 1 of 1 samples exceed the criterion for Nickel. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for nickel is 48.6 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
65906 |
Region 2 |
Walnut Creek |
||
| Pollutant: | PAHs (Polycyclic Aromatic Hydrocarbons) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are available but not relevant because there is not enough information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the objective and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. There is an associated sediment toxicity data as required by Section 3.6 of the Listing Policy, but these data are not attached to this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93585 | ||||
| Pollutant: | PAHs (Polycyclic Aromatic Hydrocarbons) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for PAHs (Polycyclic Aromatic Hydrocarbons). | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for PAH, Total is 22,800 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93584 | ||||
| Pollutant: | PAHs (Polycyclic Aromatic Hydrocarbons) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for PAHs (Polycyclic Aromatic Hydrocarbons). | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for PAH, Total is 22,800 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
66842 |
Region 2 |
Walnut Creek |
||
| Pollutant: | PCBs (Polychlorinated biphenyls) |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
One line of evidence is available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are not associated with this decision because they are not relevant to this decision because there is insufficient information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the guideline and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. Sediment toxicity data are not associated with this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 90587 | ||||
| Pollutant: | PCBs (Polychlorinated biphenyls) | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Zero of 1 sample collected for Total PCBs exceeded the evaluation guideline. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | Waters shall not contain substances in concentrations that result in the deposition of material that causes nuisance or adversely affects beneficial uses (Water Quality Control Plan for the San Francisco Bay Region). | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) - San Francisco Bay Region (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity) for total PCB is 676 ug/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data were collected at the following station 207WAL020 (Walnut Creek @ Concord Ave O.C.). | ||||
| Temporal Representation: | The samples were collected on 6/17/2008. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The SWAMP QAPP (2008) was followed. | ||||
| QAPP Information Reference(s): | Surface Water Ambient Monitoring Program Quality Assurance Program Plan | ||||
DECISION ID |
66843 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Permethrin |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are not associated with this decision because they are not relevant to this decision because there is insufficient information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the guideline and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. Sediment toxicity data are not associated with this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93586 | ||||
| Pollutant: | Permethrin, total | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Permethrin, Total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for permethrin is the median lethal concentration (LC50) of 8.9 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93587 | ||||
| Pollutant: | Permethrin, total | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Permethrin, Total. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | The evaluation guideline for permethrin is the median lethal concentration (LC50) of 8.9 ug/g and is normalized by the percentage of organic carbon in the sediment sample. The LC50 8.9 ug/g is the geometric mean of LC50 values for permethrin from Amweg et al. (2005). | ||||
| Guideline Reference: | Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
66844 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Phenanthrene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are not associated with this decision because they are not relevant to this decision because there is insufficient information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the guideline and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. Sediment toxicity data are not associated with this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93597 | ||||
| Pollutant: | Phenanthrene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Phenanthrene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Phenanthrene is 1170 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93596 | ||||
| Pollutant: | Phenanthrene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Phenanthrene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Phenanthrene is 1170 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
66845 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Pyrene |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are not associated with this decision because they are not relevant to this decision because there is insufficient information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the guideline and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. Sediment toxicity data are not associated with this decision because the sediment chemistry data are insufficient. 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. |
|
|||||
| LOE ID: | 93598 | ||||
| Pollutant: | Pyrene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Pyrene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Pyrene is 1520 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
|
|||||
| LOE ID: | 93599 | ||||
| Pollutant: | Pyrene | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Pyrene. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effects level (predictive of sediment toxicity for sediment-dwelling organisms) for Pyrene is 1520 ug/Kg dry weight (Macdonald et al. 2000) | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
DECISION ID |
66847 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Toxicity |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least one line of toxicity evidence is necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
One line of toxicity evidence is available in the administrative record to assess this pollutant. One of one samples exceed the guideline. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. One of one samples exceed the guideline and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. 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. |
|
|||||
| LOE ID: | 93611 | ||||
| Pollutant: | Toxicity | ||||
| LOE Subgroup: | Toxicity | ||||
| Matrix: | Sediment | ||||
| Fraction: | None | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 1 | ||||
| Data and Information Type: | TOXICITY TESTING | ||||
| Data Used to Assess Water Quality: | One sample was collected to evaluate sediment toxicity. The sample exhibited significant toxicity. The toxicity test included survival and growth of Hyalella azteca. One sample can have multiple toxicity test results but will be counted only once. One sample is defined as being collected on the same day at the same location with the same lab sample id (if provided). | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in, human, plant, animal, or aquatic life. Region 2 Basin Plan. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) - San Francisco Bay Region (Region 2) | ||||
| Evaluation Guideline: | Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. . For SWAMP data exceedances are counted with the significant effect code SL. SL is defined as the result being significant compared to the negative control based on a statistical test, less than stated the alpha level, AND less than the evaluation threshold. | ||||
| Guideline Reference: | Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064 | ||||
| Spatial Representation: | The sample was collected at station 207WAL020. | ||||
| Temporal Representation: | The sample was collected in June 2008. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | All data was collected following the Standard Operating Procedures and Data Quality Objectives outlined in the SWAMP QAMP, (Puckett, 2002). QA data are included in submission. | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
66846 |
Region 2 |
Walnut Creek |
||
| Pollutant: | Zinc |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 at least two lines of evidence are necessary to assess listing status for pollutants in sediment, and pollutant concentrations in sediment must be associated with sediment toxicity to justify adding that pollutant to the CWA section 303(d) List.
Two lines of evidence are available in the administrative record to assess this pollutant. Zero of one samples exceed the guideline. Sediment toxicity data are not associated with this decision because they are not relevant to this decision because there is insufficient information based on sediment chemistry. Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification for placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of one samples exceed the guideline and this sample size is insufficient to determine beneficial use support, with the power and confidence of the Listing Policy. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. Sediment toxicity data are not associated with this decision because the sediment chemistry data are insufficient. 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. |
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| LOE ID: | 93612 | ||||
| Pollutant: | Zinc | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Zinc. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for zinc is 459 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||
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|||||
| LOE ID: | 93613 | ||||
| Pollutant: | Zinc | ||||
| LOE Subgroup: | Pollutant-Sediment | ||||
| Matrix: | Sediment | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Cold Freshwater Habitat | ||||
| Number of Samples: | 1 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed SWAMP data for Walnut Creek to determine beneficial use support and results are as follows: 0 of 1 samples exceed the criterion for Zinc. | ||||
| Data Reference: | Statewide Stream Pollution Trends Study 2008 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | San Francisco Bay Basin Water Quality Control Plan 2007: All waters shall be maintained free of toxic substances in concentrations which are toxic to, or which produce detrimental physiological responses in, human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan (Basin Plan) San Francisco Bay Basin (Region 2) | ||||
| Evaluation Guideline: | In freshwater sediments the probable effect concentration (predictive of sediment toxicity for sediment-dwelling organisms) for zinc is 459 mg/Kg dry weight (MacDonald et al. 2000). | ||||
| Guideline Reference: | Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Environmental Contamination and Toxicology. 39: 20-31 | ||||
| Spatial Representation: | Data for this line of evidence for Walnut Creek was collected at 1 monitoring site [ Walnut Creek @ Concord Ave OC station (207WAL020)] | ||||
| Temporal Representation: | Data was collected on a single day 6/17/2008. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | SWAMP data collected before September 2008 followed the QAMP (2002), however there may have been overlap in QA with SWAMP QAPP (2008). | ||||
| QAPP Information Reference(s): | Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. Sacramento, CA. State Water Resources Control Board. SWAMP. December 2002 (1st version) | ||||
| Surface Water Ambient Monitoring Program Quality Assurance Program Plan | |||||