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DECISION ID |
16573 |
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| Pollutant: |
Escherichia coli (E. Coli) |
| 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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| 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.
One line of evidence is available in the administrative record to assess this pollutant. Ten samples exceed the water quality objective.
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 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. Ten of 26 samples exceeded the EPA's Recommended Criteria for bacteria and this does exceed the allowable frequency listed in Table 3.2 of the Listing Policy. However, a more appropriate and site specific criteria is being developed in time for the 2010 listing cycle.
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 though this water body's E. coli data exceeds EPA's Recommended Criteria it is not appropriate at this time to list it as impaired. There is a Storm Water Quality Task Force working on determining the appropriate indicators and the appropriate criteria to protect body contact recreation in fresh waters. Listing this waterbody for E. coli would circumvent a much needed process that is currently underway. Regional Board staff actively participate in this process with the SWQTF and will recommend review of this data in the 2010 listing cycle by when the appropriate criteria and indicators will have been developed. |
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| SWRCB Board Decision / Staff Recommendation: |
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| USEPA Decision: |
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| LOE ID: |
26083 |
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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: |
26 |
| Number of Exceedances: |
10 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Of the 26 samples collected, 10 exceeded the recommended criteria. This data originated from the Orange County Coast Keeper and funded by a Clean Water Act Section 319 (h) Grant. |
| 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 30–day 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 collected at one station in Temescal Creek - Temescal 1. Temescal 1 is located in Riverside County off of the 15 fwy at Lake Street. The station is located past the chain link fence, down the road in the creek to the right. |
| Temporal Representation: |
The samples were collected weekly as follows: 29-Oct-02
9-Dec-02, 22-Dec-02, 4-Jan-03, 23-Jan-03, 20-Feb-03, 10-Mar-03, 24-Mar-03, 15-Apr-03, 21-May-03, 19-Jun-03, 17-Jul-03, 13-Aug-03, 17-Sep-03, 8-Oct-03, 18-Nov-03, 9-Dec-03, 23-Dec-03, 29-Jan-04, 4-Mar-04, 11-Apr-04, 6-May-04, 3-Jun-04. |
| 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): |