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DECISION ID |
4256 |
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Pollutant: |
Fecal Coliform |
Final Listing Decision: |
Do Not Delist from 303(d) list (TMDL required list) |
Last Listing Cycle's Final Listing Decision: |
Do Not Delist from 303(d) list (TMDL required list)(2006) |
Revision Status |
Revised |
Sources: |
Source Unknown |
Expected TMDL Completion Date: |
2021 |
Impairment from Pollutant or Pollution: |
Pollutant |
|
Weight of Evidence: |
This pollutant is being considered for delisting under sections 4.2 of the Listing Policy. Under section 4.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant.
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 in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list.
Although a TMDL has been approved by USEPA for Chorro Creek Pathogens, USEPA has determined that a TMDL has not been approved for this pollutant waterbody combination (Chumash Creek pathogens). Therefore, this water body pollutant combination is being placed back on the 303(d) list (TMDL required list) pending completion and USEPA approval of a TMDL.
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. Seventy of 246 samples exceed the water quality objective, and these exceed the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
|
RWQCB Board Decision / Staff Recommendation: |
After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded. |
|
SWRCB Board Decision / Staff Recommendation: |
After review of the available data and information for this recommendation, SWRCB staff concluded that the water body should be placed in the Water Quality Limited Segments Being Addressed category of the section 303(d) list because a TMDL has been developed and is expected to result in attainment of the standard. |
|
USEPA Decision: |
USEPA has determined that a TMDL has not been approved by USEPA for this pollutant water body combination. Therefore, this water body pollutant combination is being placed back on the 303(d) list (TMDL required list) pending completion and USEPA approval of a TMDL. |
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|
|
LOE ID: |
1897 |
|
Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
None |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
246 |
Number of Exceedances: |
70 |
|
Data and Information Type: |
PATHOGEN MONITORING |
Data Used to Assess Water Quality: |
Seventy of 246 samples exceed the water quality objective. |
Data Reference: |
Placeholder reference 2006 303(d) |
|
Water Quality Objective/Criterion: |
Basin Plan: Fecal coliform concentration, based on minimum of not less than five samples or any 30-day period, shall not exceed a log mean of 200/100 ml, nor shall more than ten percent of the total samples during any 30-day period exceed 400/100 ml. |
Objective/Criterion Reference: |
Placeholder reference 2006 303(d) |
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Evaluation Guideline: |
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Guideline Reference: |
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Spatial Representation: |
One station was monitored on Chumash Creek. |
Temporal Representation: |
Weekly and bi-weekly sampling events occurred from 6/93 to 5/99. |
Environmental Conditions: |
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QAPP Information: |
Morro Bay National Monitoring Program. |
QAPP Information Reference(s): |
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|
LOE ID: |
1896 |
|
Pollutant: |
Fecal Coliform |
LOE Subgroup: |
Pollutant-Water |
Matrix: |
Water |
Fraction: |
Not Recorded |
|
Beneficial Use: |
Water Contact Recreation |
|
Number of Samples: |
0 |
Number of Exceedances: |
0 |
|
Data and Information Type: |
Not Specified |
Data Used to Assess Water Quality: |
Unspecified-- This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. |
Data Reference: |
Placeholder reference 2006 303(d) |
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Water Quality Objective/Criterion: |
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Objective/Criterion Reference: |
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Evaluation Guideline: |
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Guideline Reference: |
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Spatial Representation: |
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Temporal Representation: |
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Environmental Conditions: |
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QAPP Information: |
QA Info Missing |
QAPP Information Reference(s): |