| Water Body Name: | Big Pine Creek Diversion (Inyo County) |
| Water Body ID: | CAR6032016020230510040767 |
| Water Body Type: | River & Stream |
DECISION ID |
168626 |
Region 6 |
Big Pine Creek Diversion (Inyo County) |
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| 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 |
| Regional Board Conclusion: | This pollutant is being considered for placement on the CWA 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. Three lines of evidence are available in the administrative record to assess this pollutant. One of the 46 samples exceeds the E. coli water quality objective single threshold value. 0 of 32 samples exceed the E. coli water quality objective geometric mean. 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 CWA section 303(d) List. 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. One of the 46 samples exceeds the E. coli water quality objective single threshold value. 0 of 32 samples exceed the E. coli water quality objective geometric mean, 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: | 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 applicable water quality standards are not being exceeded. |
| State Board Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | |
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| LOE ID: | 336715 | ||||
| Pollutant: | Escherichia coli (E. coli) | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | STV | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 41 | ||||
| Number of Exceedances: | 1 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed Eastern Sierra Fecal Indicator Bacteria Study data for Big Pine Creek Diversion (Inyo County) to determine beneficial use support and the results are as follows: 1 of the 41 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: | WQ from the MBC Fecal indicator study in the Eastern Sierra for the 2026 Integrated Report in Region 6 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The bacteria water quality objective to protect the REC-1 beneficial use in waters other than Lake Thaoe, where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018). | ||||
| 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 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | The samples were collected at 1 monitoring site(s), station(s): LPC 8 (Lower Pine Creek Station 8). | ||||
| Temporal Representation: | The samples were collected between the days of 2016-09-13 and 2020-03-03 . | ||||
| Environmental Conditions: | |||||
| QAPP Information: | MBC FIB Bacteria QAPP | ||||
| QAPP Information Reference(s): | MBC Aquatic Sciences - FIB Bacteria QAPP - Eastern Sierra Fecal Indicator Bacteria Study - 402598 | ||||
| QAPP Information Reference(s): | MBC Aquatic Sciences - QAPP FIB Study V3. - Eastern Sierra Fecal Indicator Bacteria Study - 402641 | ||||
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| LOE ID: | 336638 | ||||
| Pollutant: | Escherichia coli (E. coli) | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | GeoMean | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 32 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed Eastern Sierra Fecal Indicator Bacteria Study data for Big Pine Creek Diversion (Inyo County) to determine beneficial use support and the results are as follows: 0 of the 32 samples exceeded the geomean water quality threshold for E. coli. This is a six week rolling geomean that is calculated weekly. | ||||
| Data Reference: | WQ from the MBC Fecal indicator study in the Eastern Sierra for the 2026 Integrated Report in Region 6 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The bacteria water quality objective to protect the REC-1 beneficial use for waters other than Lake Tahoe, where the salinity is equal to or less than 1 part per thousand 95 percent or more of the time applies a rolling six-week geometric mean of E. coli, not to exceed 100 cfu/100 mL (ISWEBE 2018). | ||||
| 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 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | The samples were collected at 1 monitoring site(s), station(s): LPC 8 (Lower Pine Creek Station 8). | ||||
| Temporal Representation: | The samples were collected between the days of 2016-09-13 and 2020-03-03 . | ||||
| Environmental Conditions: | |||||
| QAPP Information: | MBC FIB Bacteria QAPP | ||||
| QAPP Information Reference(s): | MBC Aquatic Sciences - FIB Bacteria QAPP - Eastern Sierra Fecal Indicator Bacteria Study - 402598 | ||||
| QAPP Information Reference(s): | MBC Aquatic Sciences - QAPP FIB Study V3. - Eastern Sierra Fecal Indicator Bacteria Study - 402641 | ||||
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| LOE ID: | 336678 | ||||
| Pollutant: | Escherichia coli (E. coli) | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | STV | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 5 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | Water Board staff assessed Eastern Sierra Fecal Indicator Bacteria Study data for Big Pine Creek Diversion (Inyo County) to determine beneficial use support and the results are as follows: 0 of the 5 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: | WQ from the MBC Fecal indicator study in the Eastern Sierra for the 2026 Integrated Report in Region 6 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The bacteria water quality objective to protect the REC-1 beneficial use in waters other than Lake Thaoe, where the salinity is less than 1 parts per thousand 95 percent or more of the time applies a statistical threshold value to E. coli of 320 cfu/100 mL, not to be exceeded by more than 10 percent of samples within a calendar month (ISWEBE 2018). | ||||
| 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 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | The samples were collected at 1 monitoring site(s), station(s): LPC 9 (Lower Pine Creek Station 9). | ||||
| Temporal Representation: | The samples were collected between the days of 2016-09-20 and 2017-06-14 . | ||||
| Environmental Conditions: | |||||
| QAPP Information: | MBC FIB Bacteria QAPP | ||||
| QAPP Information Reference(s): | MBC Aquatic Sciences - FIB Bacteria QAPP - Eastern Sierra Fecal Indicator Bacteria Study - 402598 | ||||
| QAPP Information Reference(s): | MBC Aquatic Sciences - QAPP FIB Study V3. - Eastern Sierra Fecal Indicator Bacteria Study - 402641 | ||||