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DECISION ID |
13182 |
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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 (1) line of evidence is available in the administrative record to assess this pollutant. Thirty-three (33) 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. Thirty- three (33) of eighty-four (84) 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 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: |
21555 |
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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: |
84 |
| Number of Exceedances: |
33 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Of the 84 samples collected, 33 exceeded EPA's Recommended single sample criteria. |
| 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 tajeb at three stations: sd4, sd5, sd6. Sd4 - Woodbridge: The Woodbridge site is located off of Alton in the back left side of the senior citizen community center. The site is down the bank under the pedestrian footbridge, on the upstream side of the bridge.
Sd5 - Irvine Civic Center: This site is located behind the Irvine Civic center on Alton Drive in Irvine. The Civic Center site SD5 usually hosts a wide variety of bird life from mallard ducks to great Herons.
Sd6 - Michelson: The Michelson site is located off of the 405 freeway and Jamboree west, to Michelson south, and then west on Riparian Way. The site is located down the dirt road just past the bridge. |
| Temporal Representation: |
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| 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): |