| Water Body Name: | Hernandez Reservoir |
| Water Body ID: | CAL3055001619980828154910 |
| Water Body Type: | Lake & Reservoir |
DECISION ID |
6184 |
Region 3 |
Hernandez Reservoir |
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| Pollutant: | Mercury |
| 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)(2006) |
| Revision Status | Revised |
| Sources: | Subsurface Mining |
| TMDL Name: | Clear Creek and Hernandez Reservoir Mercury |
| TMDL Project Code: | 123 |
| Date TMDL Approved by USEPA: | 06/03/2004 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under section 2.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant.
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 out of 4 samples exceeded the OEHHA Screening Value. However, a TMDL is in place to address this pollutant in this water body. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. The USEPA final decision on the 2006 303(d) list was to move this listing to the 'being addressed by a USEPA approved TMDL' portion of the 303(d) list, because a TMDL and implementation plan has been approved for this water segment-pollutant combination by USEPA on 06/03/2004 (USEPA, 2007). |
| Regional Board Decision Recommendation: | No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed. |
| State Board Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
| USEPA Action (if applicable): | |
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| LOE ID: | 696 | ||||
| Pollutant: | Mercury | ||||
| LOE Subgroup: | Pollutant-Tissue | ||||
| Matrix: | Tissue | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms | ||||
| Number of Samples: | 4 | ||||
| Number of Exceedances: | 3 | ||||
| Data and Information Type: | Fish tissue analysis | ||||
| Data Used to Assess Water Quality: | Three out of 4 samples exceeded. Four filet composite samples were collected: 2 largemouth bass, 1 channel catfish, and 1 bullhead. Bass were collected in 1995 and 2002, channel catfish in 1995, and bullhead in 2002. Only the bullhead sample did not exceed the guideline (TSMP, 2002). | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | Central Coast RWQCB Basin Plan: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or produce detrimental physiological responses in human, plant, animal, or aquatic life. | ||||
| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | 0.3 ug/g (OEHHA Screening Value). | ||||
| Guideline Reference: | Placeholder reference 2006 303(d) | ||||
| Spatial Representation: | One station located in Lake Hernandez on the San Benito River. | ||||
| Temporal Representation: | Samples were collected 11/30/95 and 11/7/02. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Toxic Substances Monitoring Program 1994-95 Data Report.
Environmental Chemistry Quality Assurance and Data Report for the Toxic Substances Monitoring Program, 2001-2002. Department of Fish and Game |
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| QAPP Information Reference(s): | |||||
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| LOE ID: | 695 | ||||
| Pollutant: | Mercury | ||||
| LOE Subgroup: | Pollutant-Tissue | ||||
| Matrix: | Tissue | ||||
| Fraction: | Not Recorded | ||||
| Beneficial Use: | Commercial or recreational collection of fish, shellfish, or organisms | ||||
| 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): | |||||