| Pollutant: |
Indicator Bacteria |
| Final Listing Decision: |
Do Not List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: |
Do Not List on 303(d) list (TMDL required list)(2018) |
| Revision Status |
Original |
| Impairment from Pollutant or Pollution: |
Pollutant |
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| Regional Board Conclusion: |
In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Lacking constant inputs, indicator bacteria do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Historic lines of evidence for data collected prior to October 21, 2012 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy.
No data has been collected from on or after October 21, 2012 and so the existing decision will carry-over. Beneficial use support will be reassessed in a future cycle, if more data are available. |
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| Regional Board Decision 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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| State Board Review of Regional Board Conclusion and Recommendation: |
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| State Board Decision Recommendation: |
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Line of Evidence (LOE) for Decision ID 170481, Indicator Bacteria
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Region 1 |
Chadbourne Gulch Beach |
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| LOE ID: |
133661 |
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| Pollutant: |
Enterococcus |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
None |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
1 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
Water Board staff assessed Beachwatch_Mendocino County data for Chadbourne Gulch Beach to determine beneficial use support and the results are as follows: 0 of the 1 samples exceeded the Statistical Threshold Value (STV) water quality standard for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly. |
| Data Reference: |
Mendocino County Beachwatch data reformatted and renamed to match CEDEN fields. |
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| SWAMP Data: |
Non-SWAMP |
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| Water Quality Objective/Criterion: |
The bacteria water quality objective to protect the REC-1 beneficial for all waters where the salinity is equal to or greater than 10 ppth 95 percent or more of the time, is a Statistical Threshold Value (STV) of 110 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly). |
| Objective/Criterion Reference: |
Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy |
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| Evaluation Guideline: |
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| Guideline Reference: |
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| Spatial Representation: |
The samples were collected at 1 monitoring site(s), station(s): Chadbourne Gulch |
| Temporal Representation: |
The samples were collected between the days of 2003-03-19 and 2003-03-19 . |
| Environmental Conditions: |
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| QAPP Information: |
Data exempt from QAPP requirement. Draft QAPP for Mendocino County Beachwatch data used instead. Represents data collection procedure prior to development of a formal QAPP. |
| QAPP Information Reference(s): |
Draft QAPP for Mendocino County Beachwatch. Represents data collection procedure prior to development of a formal QAPP. |
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Line of Evidence (LOE) for Decision ID 170481, Indicator Bacteria
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Region 1 |
Chadbourne Gulch Beach |
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| LOE ID: |
25267 |
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| Pollutant: |
Fecal Coliform |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Total |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
3 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
None of the 3 single samples of fecal coliform collected at Blues Beach at Chadbourne Gulch exceed the objective. Additionally, none of the 3 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used to analyzed the same data. Samples were collected by the Mendocino County Environmental Health Division in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (North Coast RWQCB 2007). |
| Data Reference: |
North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006 |
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| SWAMP Data: |
Non-SWAMP |
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| Water Quality Objective/Criterion: |
Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the five most recent samples from each site: Fecal coliform density shall not exceed 200 MPN per 100 ml. The following standard is for the single sample maximum: Fecal coliform density shall not exceed 400 per 100ml. *Note: MPN is the most probable number of coliform units. |
| 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: |
Samples were collected at Blues Beach at Chadbourne Gulch. |
| Temporal Representation: |
Samples were collected weekly from May to August 2006. |
| Environmental Conditions: |
Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data. |
| QAPP Information: |
Samples were collected and analyzed in accordance with the Sampling and Analysis Plan and the Laboratories and Laboratory Analyses procedures described in the "Draft Guidance for Salt Water Beaches" (DHS 2006). |
| QAPP Information Reference(s): |
Draft Guidance for Salt Water Beaches. Last Update: April 10, 2006. Initial Draft: November 1997. Division of Drinking Water and Environmental Management, California Department of Health Services |
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Line of Evidence (LOE) for Decision ID 170481, Indicator Bacteria
|
Region 1 |
Chadbourne Gulch Beach |
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| LOE ID: |
25268 |
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| Pollutant: |
Enterococcus |
| LOE Subgroup: |
Pollutant-Water |
| Matrix: |
Water |
| Fraction: |
Total |
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| Beneficial Use: |
Water Contact Recreation |
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| Number of Samples: |
3 |
| Number of Exceedances: |
0 |
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| Data and Information Type: |
PATHOGEN MONITORING |
| Data Used to Assess Water Quality: |
None of the 3 single samples of enterococcus collected at Blues Beach at Chadbourne Gulch exceed the objective. Additionally, none of the 3 30-day geomean values exceed the objective. The single sample and geomean values are two different matrices used to analyzed the same data. Samples were collected by the Mendocino County Environmental Health Division in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. Data is maintained by the State Water Board's Beach Watch program. Data is summarized by the North Coast Regional Water Board (North Coast RWQCB 2007). |
| Data Reference: |
North Coast Beach Watch Data. Bacteria data collected by Del Norte County, Humboldt County, Mendocino County Environmental Health Division, Sonoma County Division of Environmental Health, and Marin County in accordance with AB411. Data managed by the State Water Resources Control Board's Beach Watch program at beachwatch.waterboards.ca.gov. Includes data from 2004 to 2006 |
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| SWAMP Data: |
Non-SWAMP |
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| Water Quality Objective/Criterion: |
Per the Ocean Plan (SWRCB 2005): The following bacterial objectives shall be maintained throughout the water column. The following standard is based on the 30-day geometric mean of the 5 most recent samples from each site: Enterococcus density shall not exceed 35 MPN per 100ml. The following standard is for the single sample maximum: Enterococcus density shall not exceed 104 per 100 ml. *Note: MPN is the most probable number of coliform units. |
| 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: |
Samples were collected at Blues Beach at Chadbourne Gulch. |
| Temporal Representation: |
Samples were collected weekly from May to August 2006. |
| Environmental Conditions: |
Samples were collected during the dry season. Otherwise, there are no known environmental conditions (e.g., land use practices, fire events, storms, etc.) that are related to these data. |
| QAPP Information: |
Samples were collected and analyzed in accordance with the Sampling and Analysis Plan and the Laboratories and Laboratory Analyses procedures described in the "Draft Guidance for Salt Water Beaches" (DHS 2006). |
| QAPP Information Reference(s): |
Draft Guidance for Salt Water Beaches. Last Update: April 10, 2006. Initial Draft: November 1997. Division of Drinking Water and Environmental Management, California Department of Health Services |
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