| Pollutant: |
Mercury |
| 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 |
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| Regional Board Conclusion: |
Region 3 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle. |
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| Regional Board Decision Recommendation: |
N/A |
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| State Board Staff Review of Regional Board Conclusion and Recommendation: |
|
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| State Board Decision Recommendation: |
After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
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Line of Evidence (LOE) for Decision ID 25904, Mercury
|
Region 3 |
San Antonio Reservoir |
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| LOE ID: |
31017 |
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| Pollutant: |
Mercury |
| LOE Subgroup: |
Pollutant-Tissue |
| Matrix: |
Tissue |
| Fraction: |
Fish fillet |
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| Beneficial Use: |
Commercial or recreational collection of fish, shellfish, or organisms |
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| Number of Samples: |
36 |
| Number of Exceedances: |
9 |
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| Data and Information Type: |
Fish tissue analysis |
| Data Used to Assess Water Quality: |
Fish were collected for tissue analysis at three locations from San Antonio Reservoir. A total of 36 sample composites were generated from two species: Largemouth Bass (33) and Common Carp (3). Details of the compositing protocol can be found in the March 2009 report entitled: "Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Study" (SWAMP, 2009). A total of 9 out of 36 samples exceeded the OHHEA fish tissue screening value for human health. |
| Data Reference: |
Data associated with report entitled: Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA |
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Contaminants in Fish from California Lakes and Reservoirs: Technical Report on Year One of a Two-Year Screening Survey. A Report of the Surface Water Ambient Monitoring Program (SWAMP). California State Water Resources Control Board, Sacramento, CA |
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Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008 |
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| SWAMP Data: |
SWAMP |
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| Water Quality Objective/Criterion: |
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. (Water Quality Control Plan, Central Coast Basin, General Objective Chapter III, Section II.A.2 Objectives for all Inland Surface Waters, Enclosed Bays and Estuaries). |
| Objective/Criterion Reference: |
Water Quality Control Plan (Basin Plan) - Central Coast Region (Region 3) |
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| Evaluation Guideline: |
Office of Environmental Health Hazard Assessment (OEHHA) Screening Value of 0.3 mg/kg to protect human health when consuming fish (OEHHA, 1999). |
| Guideline Reference: |
Prevalence of Selected Target Chemical Contaminants in Sport Fish From Two California Lakes: Public health designed screening study. Sacramento, CA: Office of Environmental Health Hazard Assessment |
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| Spatial Representation: |
Samples were collected from three locations in San Antonio Reservoir. As discussed in the Lakes and Reservoirs Report (SWAMP, 2009), individual sample locations consisted of an area within a given waterbody with an approximate one-mile diameter, from which multiple fish tissue samples were collected. The number of sample locations per waterbody was based on the overall size of the waterbody. Specifics of individual sampling locations can be found in the supplemental report entitled "Cruise Report for the Surface Waters Ambient Monitoring Program (SWAMP) Bioaccumulation Screening Study in California Lakes and Reservoirs, Sampling Dates: June 2007- March 2008" (SWAMP, 2008). Data collected from this waterbody was assigned under Station Name "Lake Nacimiento" in the SWAMP report. |
| Temporal Representation: |
Samples were collected on July 10, 2007 |
| Environmental Conditions: |
There are no known environmental conditions (e.g., seasonality, land use practices, fire events, storms, etc.) that are related to these data. |
| QAPP Information: |
Samples were collected, processed, and analyzed in accordance with the methods described in "Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs." (SWAMP, 2008). |
| QAPP Information Reference(s): |
Quality Assurance Project Plan Screening Study of Bioaccumulation in California Lakes and Reservoirs. Moss Landing Marine Labs. Prepared for
SWAMP BOG, 49 pages plus appendices and attachments |
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