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DECISION ID |
10417 |
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| Pollutant: |
Total Coliform |
| 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 water segment-pollutant combination is being considered for placement on the section 303(d) list under section 3.3 of the Listing Policy. Under section 3.3 a single line of evidence is necessary to assess listing status.
Three lines of evidence are available in the administrative record to assess this water segment-pollutant combination. Water Board staff assessed one data set against three different evaluation criteria (i.e. single sample maximum, geomean, and total to fecal ratio). Six of 105 samples exceeded the single sample maximum water quality objective for Water Contact Recreation, four of 23 geomean assessments exceeded the geomean objective, and one of 105 sample ratio exceeded the total to fecal ratio 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. Six of 105 samples exceeded the single sample maximum water quality objective for Water Contact Recreation, four of 23 geomean assessments exceeded the geomean objective, and one of 105 sample ratio exceeded the total to fecal ratio objective. None of these 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. |
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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 not be placed on the section 303(d) list because applicable water quality standards are not being exceeded. |
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| SWRCB Board Decision / Staff Recommendation: |
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| USEPA Decision: |
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| LOE ID: |
19203 |
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| Pollutant: |
Total Coliform |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
105 |
| Number of Exceedances: |
1 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed data for Pacific Ocean at Arroyo Quemada Beach (Santa Barbara County) to determine beneficial use support and results are as follows: 1 of 105 samples exceed the criterion for Coliform, Total. |
| Data Reference: |
AB 411 Data for 2004 |
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AB 411 Data for 2005 |
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AB 411 Data for 2006 |
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| Water Quality Objective/Criterion: |
California Ocean Plan (2005) single sample maximum standard for total coliform states that total coliform density shall not exceed 1,000 MPN/100 mL when the fecal coliform/total coliform ratio exceeds 0.1. |
| Objective/Criterion Reference: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
Data for this line of evidence for Pacific Ocean at Arroyo Quemada Beach (Santa Barbara County) was collected at one monitoring site (Arroyo Quemada) |
| Temporal Representation: |
Data was collected over the time period 1/5/2004 - 3/27/2006. This includes weekly AB411 monitoring between April 1 and October 31 of each year. |
| Environmental Conditions: |
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| QAPP Information: |
QA information not available |
| QAPP Information Reference(s): |
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| LOE ID: |
19607 |
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| Pollutant: |
Total Coliform |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
105 |
| Number of Exceedances: |
6 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed data for Pacific Ocean at Arroyo Quemada Beach (Santa Barbara County) to determine beneficial use support and results are as follows: 6 of 105 samples exceed the criterion for Coliform, Total. |
| Data Reference: |
AB 411 Data for 2004 |
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AB 411 Data for 2005 |
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AB 411 Data for 2006 |
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| Water Quality Objective/Criterion: |
California Ocean Plan (2005) single sample maximum states that total coliform density shall not exceed 10,000 MPN/100 mL. |
| Objective/Criterion Reference: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
Data for this line of evidence for Pacific Ocean at Arroyo Quemada Beach (Santa Barbara County) was collected at one monitoring site (Arroyo Quemada) |
| Temporal Representation: |
Data was collected over the time period 1/5/2004 - 3/27/2006. This includes weekly AB411 monitoring between April 1 and October 31 of each year. |
| Environmental Conditions: |
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| QAPP Information: |
QA information not available |
| QAPP Information Reference(s): |
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| LOE ID: |
19608 |
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| Pollutant: |
Total Coliform |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
23 |
| Number of Exceedances: |
4 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Central Coast Regional Board Staff assessed data for Pacific Ocean at Arroyo Quemada Beach (Santa Barbara County) to determine beneficial use support and results are as follows: 4 of 23 samples exceed the criterion for Coliform, Total. |
| Data Reference: |
AB 411 Data for 2004 |
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AB 411 Data for 2005 |
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AB 411 Data for 2006 |
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| Water Quality Objective/Criterion: |
California Ocean Plan (2005) 30-day geometric mean standard for total coliform states that total coliform density shall not exceed 1,000 MPN/100 mL. |
| Objective/Criterion Reference: |
Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
Data for this line of evidence for Pacific Ocean at Arroyo Quemada Beach (Santa Barbara County) was collected at one monitoring site (Arroyo Quemada) |
| Temporal Representation: |
Data was collected over the time period 1/5/2004 - 3/27/2006. This includes weekly AB411 monitoring between April 1 and October 31 of each year. |
| Environmental Conditions: |
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| QAPP Information: |
QA information not available |
| QAPP Information Reference(s): |