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DECISION ID |
13087 |
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| Pollutant: |
Escherichia coli (E. Coli) |
| Final Listing Decision: |
List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
New Decision |
| Revision Status |
Revised |
| Sources: |
Unknown Point Source | Urban Runoff/Storm Sewers |
| Expected TMDL Completion Date: |
2022 |
| Impairment from Pollutant or Pollution: |
Pollutant |
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| Weight of Evidence: |
This pollutant is being considered for placement on the 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.
Two (2) lines of evidence are available in the administrative record to assess this pollutant. Twenty (20) of the samples exceed the water quality objective.
Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.
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. Twenty (20) of seventy-nine (79) samples exceed the US EPA Recommended Ambient Water Quality Criteria for Bacteria -1986 and this exceeds 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. |
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| RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
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| SWRCB Board Decision / Staff Recommendation: |
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| USEPA Decision: |
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| LOE ID: |
21472 |
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| Pollutant: |
Escherichia coli (E. Coli) |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Warm Freshwater Habitat |
| Aquatic Life Use: |
Warm Freshwater Habitat |
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| Number of Samples: |
25 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Of the 25 samples taken, none exceeded EPA's Recommended single sample standard. |
| Data Reference: |
Orange County Coast Keeper Coastal Watersheds Project |
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| Water Quality Objective/Criterion: |
USEPA Recommended Ambient Water Quality Criteria for Bacteria -1986: E. coli: log mean less than 126 organisms/100 mL based on five or more samples per 30day period, and not more than 10% of the samples exceed 235 organisms/100mL for any 30 day period. |
| Objective/Criterion Reference: |
Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002 |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
The samples were taken from one location at gs3 |
| Temporal Representation: |
The samples were taken monthly starting on October 29, 2002 through June 3, 2004. |
| Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
| QAPP Information: |
The data's quality is deemed appropriate because it was obtained under the auspices of a QAPP approved by the Regional Board. |
| QAPP Information Reference(s): |
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| LOE ID: |
21471 |
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| Pollutant: |
Escherichia coli (E. Coli) |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Warm Freshwater Habitat |
| Aquatic Life Use: |
Warm Freshwater Habitat |
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| Number of Samples: |
54 |
| Number of Exceedances: |
20 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Of the 54 samples collected, 20 exceeded the EPA's Recommended single sample criteria. The exceedances took place at two locations gs1, and gs2 |
| Data Reference: |
Orange County Coast Keeper Coastal Watersheds Project |
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| Water Quality Objective/Criterion: |
USEPA Recommended Ambient Water Quality Criteria for Bacteria -1986: E. coli: log mean less than 126 organisms/100 mL based on five or more samples per 30day period, and not more than 10% of the samples exceed 235 organisms/100mL for any 30 day period. |
| Objective/Criterion Reference: |
Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002 |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
The samples were taken at two locations: gs1, and gs2 |
| Temporal Representation: |
The samples were collected monthly starting with October 29, 2002 through June 3, 2004. |
| Environmental Conditions: |
Staff is not aware of any special conditions that might effect interpretation of the data. |
| QAPP Information: |
The data's quality is deemed appropriate because it was obtained under the auspices of a QAPP approved by the Regional Board. |
| QAPP Information Reference(s): |