| Water Body Name: | San Vicente Creek (San Diego County) |
| Water Body ID: | CAR9072200020081210155551 |
| Water Body Type: | River & Stream |
DECISION ID |
29754 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | Phosphorus |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. Two of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of 5 samples exceeded the water quality objective for total phosphorus and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
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| LOE ID: | 31427 | ||||
| Pollutant: | Phosphorus | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 2 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Two of the 5 samples collected at San Vicente Creek exceed the water quality objective for total phosphorus. | ||||
| Data Reference: | Surface Water Ambient Monitoring Program Report on the San Diego Hydrologic Unit; Final Technical Report 2007 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | Inland surface waters, bays and estuaries and coastal lagoon waters shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses. For inland surface waters-streams and other flowing waters, with all beneficial uses, the water quality objective for total phosphorus is 0.1 mg/L. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Spatial Representation: | Water samples were collected at San Vicente Creek station 907SDSVC4; (Latitude 32.9934, Longitude -116.8498). | ||||
| Temporal Representation: | Data was collected during 2002. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected and measured as per the SWAMP Quality Assurance Management Plan (QAMP). | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
30376 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | Sulfates |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. Four of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Four of 4 samples exceeded the water quality objective for sulfates and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
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| LOE ID: | 31429 | ||||
| Pollutant: | Sulfates | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 4 | ||||
| Number of Exceedances: | 4 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Four of the 4 samples collected at San Vicente Creek exceed the water quality objective for sulfates. | ||||
| Data Reference: | Monitoring data for Region 9 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | For inland surface waters in the San Vicente HA and all beneficial uses, the WQO for sulfate is 65 mg/L. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Spatial Representation: | Water samples were collected at San Vicente Creek station 907SDSVC4; (Latitude 32.9934, Longitude -116.8498). | ||||
| Temporal Representation: | Data was collected in 2004 and 2005. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected and measured as per the SWAMP Quality Assurance Management Plan (QAMP). | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
30312 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | pH |
| Final Listing Decision: | Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | Do Not List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Three of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of 4 samples exceeded the water quality objective for pH and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
|
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| LOE ID: | 31430 | ||||
| Pollutant: | pH | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 4 | ||||
| Number of Exceedances: | 3 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Three of the 4 samples collected at San Vicente Creek exceed the water quality objective for pH. | ||||
| Data Reference: | Surface Water Ambient Monitoring Program Report on the San Diego Hydrologic Unit; Final Technical Report 2007 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | For inland surface waters and all beneficial uses, the WQO for pH is 6.5 (minimum) to 8.5 (maximum). | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Spatial Representation: | Water samples were collected at San Vicente Creek station 907SDSVC4; (Latitude 32.9934, Longitude -116.8498). | ||||
| Temporal Representation: | Data was collected during 2002. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected and measured as per the SWAMP Quality Assurance Management Plan (QAMP). | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
29753 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | Ammonia as Nitrogen |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2021 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. Two of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of 5 samples exceed the water quality objective for un-ionized ammonia as nitrogen and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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| LOE ID: | 31428 | ||||
| Pollutant: | Ammonia as Nitrogen | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 2 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Two of the 5 samples collected at San Vicente Creek exceed the water quality objective for un-ionized ammonia as N. | ||||
| Data Reference: | Surface Water Ambient Monitoring Program Report on the San Diego Hydrologic Unit; Final Technical Report 2007 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | From the Basin Plan the WQO for un-ionized ammonia (NH3) for inland surface waters is 0.025mg/L (as N). | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Spatial Representation: | Water samples were collected at San Vicente Creek station 907SDSVC4; (Latitude 32.9934, Longitude -116.8498). | ||||
| Temporal Representation: | Data was collected during 2002. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected and measured as per the SWAMP Quality Assurance Management Plan (QAMP). | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
29752 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | Benthic Community Effects |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2021 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
Regional Board Conclusion: Benthic Community Effects is being considered for placement on the section 303(d) list under sections 3.9 and 3.2 of the Listing Policy. Under section 3.9, an additional line of evidence associating the Benthic Community Effects with a water or sediment concentration of pollutants is necessary to assess listing status. One line of evidence is available in the administrative record to assess this indicator. 5 of 6 samples exceeded the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this water segment on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. 5 of 6 samples exceeded the Index of Biological Integrity (IBI) value of "poor" water quality for this area and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy, however as required under section 3.9 of the Listing Policy, pollutant(s) could not be directly associated with the Benthic Community Effects. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. State Board Review and Conclusion: State Water Board staff used section 3.11 situation-specific weight of evidence approach to evaluate Benthic Community Effects for placement on the section 303(d) list. State Water Board staff determined that it is necessary to include these listings because additional data analyses and multiple line of evidence show that benthic macroinvertebrate populations are impacted by a wide range of stressors. Multiple lines of evidence are available in the administrative record to assess this pollutant. The water quality chemistry and bioassessment data provide a substantial basis that benthic macroinvertebrate populations are impacted by a wide range of anthropogenic stressors. Based on the available data and information, the weight of evidence indicates there is sufficient justification for placing this water segment-pollutant combination on the section 303(d) list. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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| LOE ID: | 26854 | ||||
| Pollutant: | Benthic Community Effects | ||||
| LOE Subgroup: | Adverse Biological Responses | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 6 | ||||
| Number of Exceedances: | 5 | ||||
| Data and Information Type: | Benthic macroinvertebrate surveys | ||||
| Data Used to Assess Water Quality: | Six samples of IBI data were taken on November 2000 to 2007 at two sampling sites. Out of the total number of samples, five samples exceeded the IBI impairment threshold. | ||||
| Data Reference: | Fish and Game IBI Data | ||||
| 2007 SDRWQCB Bioassessment Data | |||||
| Southern California Postfire Study. Index of Biotic Integrity. 2007 | |||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | From the San Diego Basin Plan the objective is: 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. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | The Index of Biological Integrity (IBI) is an analytical tool that can be used to assess the biological and physical condition of streams and rivers within a zero to one hundred scoring range: Very Poor 0-19, Poor 20-39, Fair 40-59, Good 60- 79, Very Good 80-100. The IBI score of 39 was set as an impairment threshold because it is a statistical criterion of two standard deviations below the mean reference site score which defines the boundary between 'fair' and 'poor' IBI creek conditions. (Ode, p. 9) | ||||
| Guideline Reference: | A Quantitative Tool for Assessing the Integrity of Southern Coastal California Streams. Environmental Management. Volume 35, number 1 (2005): pp. 1-13 | ||||
| Spatial Representation: | Samples were collected at two sites: 907SVWCRx and 907SDSVC3 on San Vicente Creek. | ||||
| Temporal Representation: | Sampling occurred during six events from November 2000 to 2007. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Quality Control for collection and identification was conducted in accordance with the Quality Assurance Project Plan for the California Stream Bioassessment Procedure and the State of California, California Monitoring an Assessment Program: "CMAP", Quality Assurance Project Plan. | ||||
| QAPP Information Reference(s): | State of California, California Monitoring and Assessment Program: "CMAP". | ||||
| Quality Assurance Project Plan for the California Stream Bioassessment Procedure | |||||
| The San Diego Stream Team Quality Assurance Project Plan | |||||
DECISION ID |
30311 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | Total Nitrogen as N |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2021 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One lines of evidence are available in the administrative record to assess this pollutant. Five of the samples exceed the water quality criterion. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Five of 5 samples exceed the water quality criterion for total nitrogen and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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| LOE ID: | 31426 | ||||
| Pollutant: | Total Nitrogen as N | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 5 | ||||
| Data and Information Type: | Non-fixed station physical/chemical (conv + toxicants during key seasons and flows) | ||||
| Data Used to Assess Water Quality: | Five of the 5 samples collected at San Vicente Creek show excessive nitrogen concentrations. | ||||
| Data Reference: | Surface Water Ambient Monitoring Program Report on the San Diego Hydrologic Unit; Final Technical Report 2007 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total phosphorus, P. These values are not to be exceeded more than 10% of the time unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used | ||||
| Guideline Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Spatial Representation: | Water samples were collected at San Vicente Creek station 907SDSVC4; (Latitude 32.9934, Longitude -116.8498). | ||||
| Temporal Representation: | Data was collected during 2002. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected and measured as per the SWAMP Quality Assurance Management Plan (QAMP). | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
30379 |
Region 9 |
San Vicente Creek (San Diego County) |
||
| Pollutant: | Toxicity |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2010) |
| Revision Status | Original |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2021 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
This pollutant is being considered for placement on the section 303(d) list under section 3.6 of the Listing Policy. Under section 3.6 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. Four of the samples exceed the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Four of 5 samples exhibits significant toxicity and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | Region 9 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded due to toxicity. |
|
|||||
| LOE ID: | 31431 | ||||
| Pollutant: | Toxicity | ||||
| LOE Subgroup: | Toxicity | ||||
| Matrix: | -N/A | ||||
| Fraction: | None | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 4 | ||||
| Data and Information Type: | Ambient toxicity testing (chronic) | ||||
| Data Used to Assess Water Quality: | Chronic water toxicity was evaluated with 7-day exposures on the water flea, Ceriodaphnia dubia, and 96-hour exposures to the alga Selenastrum capricornutum. Four out of 5 samples exhibit significant toxicity. | ||||
| Data Reference: | Surface Water Ambient Monitoring Program Report on the San Diego Hydrologic Unit; Final Technical Report 2007 | ||||
| SWAMP Data: | SWAMP | ||||
| Water Quality Objective/Criterion: | All waters shall be free of toxic substances that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan for the San Diego Basin | ||||
| Evaluation Guideline: | Samples meeting the following criteria were considered toxic: 1) treatment responses significantly different from controls, as determined by a statistical t-test; and 2) endpoints less than 80% of controls. | ||||
| Guideline Reference: | Surface Water Ambient Monitoring Program Report on the San Diego Hydrologic Unit; Final Technical Report 2007 | ||||
| Spatial Representation: | Water samples were collected at San Vicente Creek station 907SDSVC4; (Latitude 32.9934, Longitude -116.8498). | ||||
| Temporal Representation: | Data was collected between 2004 and 2006. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected and measured as per the SWAMP Quality Assurance Management Plan (QAMP). | ||||
| QAPP Information Reference(s): | |||||