| Water Body Name: | Topaz Lake |
| Water Body ID: | CAL6311006019980806141405 |
| Water Body Type: | Lake & Reservoir |
DECISION ID |
5586 |
Region 6 |
Topaz Lake |
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| Pollutant: | Sedimentation/Siltation |
| Final Listing Decision: | Delist from 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | Delist from 303(d) list (TMDL required list)(2006) |
| Revision Status | Original |
| Reason for Delisting: | Flaws in original listing |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that the original listing basis is faulty due to a lack of data to support the listing. |
| Regional Board Decision Recommendation: | This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed. |
| 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: | 751 | ||||
| Pollutant: | Sedimentation/Siltation | ||||
| LOE Subgroup: | Testimonial Evidence | ||||
| Matrix: | Not Specified | ||||
| 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: | These listings were based on best professional judgment after staff observed turbid water in an irrigation channel that diverts water from the mainstem West Walker River into Topaz Lake. No data or other information was provided. The irrigation channel was mistakenly identified as the West Walker River, resulting in its listing (in error) for sedimentation as well. The West Walker River remained on the list following the extreme flood event of 1997, due to concerns over potential impacts from flooding.
The basis of this listing is faulty due to lack of data. Regional Board staff is not aware of evidence to indicate current water quality standards exceedances or beneficial use impacts related to this listing. |
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| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | |||||
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| Evaluation Guideline: | |||||
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| Spatial Representation: | |||||
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| Environmental Conditions: | |||||
| QAPP Information: | QA Info Missing | ||||
| QAPP Information Reference(s): | |||||