| Pollutant: |
Indicator Bacteria |
| 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 |
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| Regional Board Conclusion: |
Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available. |
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| 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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| State Board Review of Regional Board Conclusion and Recommendation: |
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| State Board Decision Recommendation: |
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Line of Evidence (LOE) for Decision ID 127099, Indicator Bacteria
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Region 5 |
Bean Creek (Mariposa County) |
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| LOE ID: |
194453 |
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| Pollutant: |
Escherichia coli (E. coli) |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
4 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Water Board staff assessed data for Bean Creek (Mariposa County) to determine beneficial use support and the results are as follows: 0 of the 4 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly. |
| Data Reference: |
Water data for the 2020/2022 integrated report in Region 5. |
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| SWAMP Data: |
Non-SWAMP |
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| Water Quality Objective/Criterion: |
The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a STATISTICAL THRESHOLD VALUE (STV) of 320 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly). |
| Objective/Criterion Reference: |
Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
The samples were collected at 1 monitoring site(s), station(s): BeanC |
| Temporal Representation: |
The samples were collected between the days of 2018-03-05 and 2019-03-18 . |
| Environmental Conditions: |
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| QAPP Information: |
Central Sierra Environmental Resource Center. 2018. Surface Water Ambient Monitoring Project in the Merced, Mokelumne, Stanislaus and Tuolumne River Watersheds. |
| QAPP Information Reference(s): |
Surface Water Ambient Monitoring Project in the Merced, Mokelumne, Stanislaus and Tuolumne River Watersheds |
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