| Water Body Name: | Trinidad State Beach |
| Water Body ID: | CAC1081001220070319161337 |
| Water Body Type: | Coastal & Bay Shoreline |
DECISION ID |
23806 |
Region 1 |
Trinidad State Beach |
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| Pollutant: | Indicator Bacteria |
| 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)(2010) |
| Revision Status | Revised |
| Sources: | Source Unknown |
| Expected TMDL Completion Date: | 2019 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Fecal indicator bacteria (which includes enterococcus, fecal coliform, and total coliform) are being considered for removal from the Section 303(d) list under Section 4.3 of the Listing Policy. Under this section a single line of evidence (LOE) is necessary to assess listing status. Seven LOEs are available in the administrative record to assess indicator bacteria in this water body for the attainment of contact recreation standards. In addition two LOEs are available for total coliform for the attainment of shell fish harvesting standards.
It should be noted that an additional three LOEs for total coliform data were not utilized in this decision because these bacteria are widespread in nature and occur in non-fecal sources such as soil and submerged wood and are not a good measure for the protection of contact recreation beneficial uses. However, the California Ocean Plan has specific total coliform objectives for waters designated for shellfish harvesting. 52 out 111 samples exceeded the total coliform objective of 70 MPN/100ml expressed as a 30 day rolling geometric mean. 32 of 152 samples exceeded the single sample SHELL objective of 230 MPN/100mL, both exceed the threshold iterated in section 3.3 of the Listing Policy. In the 2010 Integrated Report, the data results for single sample maximum and geometric mean calculations were presented in the same LOE. In the 2006 and 2012 Integrated Reports, the data results for single sample maximum and geometric mean calculations are presented in separate LOEs. The following summary presents the total number of exceedances and total sample count from the three listing cycles combined, for single sample maximum separate from geometric mean: 1) 11 of 272 samples exceed the single sample maximum objective for enterococcus; 2) 11 of 219 samples exceed the geometric mean objective for enterococcus; 3) Zero of 190 samples exceed the single sample maximum objective for fecal coliform; 4) Zero of 122 samples exceed the geometric mean objective for fecal coliform. The data assessed in this decision are ocean beach bacteria data collected in accordance with AB411 (Chapter 765, Statutes of 1997) requirements. In accordance with Section 4.3 of the Listing Policy, a 4% exceedance rate shall be used to remove waters to the List "if water quality monitoring was conducted April 1 through October 31 only". However, the data assessed in this decision include data collected during months outside the April - October range. Therefore, this pollutant is being considered for removal from the section 303(d) list under section 4.2 of the Listing Policy at a 10% exceedance rate, and waters should be removed from the list if less than or equal to: 1) 45 of 272 samples exceed the single sample maximum objective for enterococcus; 2) 36 of 219 samples exceed the geometric mean objective for enterococcus; 3) 31 of 190 samples exceed the single sample maximum objective for fecal coliform; 4) 20 of 122 samples exceed the geometric mean objective for fecal coliform. Neither the enterococcus nor the fecal coliform samples (both single samples and geomean values) violate the allowable 10% exceedance rate. While the Contact Recreation beneficial use appears to be protected, the Shellfish harvesting beneficial use is impaired. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (i.e., sufficient justification to not delist). 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) Neither the enterococcus nor the fecal coliform samples exceed the objective more than the allowable frequency identified in Section 4.3 of the Listing Policy. (4)The samples for total coliform exceeded the objectves more than the allowable frequency identified in Section 4.3 of the listing policy. (5) Pursuant to Section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. |
| Regional Board Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded. |
| State Board Staff Review of Regional Board Conclusion and Recommendation: | Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list (i.e., sufficient justification to not delist). 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) Neither the enterococcus nor the fecal coliform samples exceed the objective more than the allowable frequency identified in Section 4.3 of the Listing Policy. (4)The samples for total coliform exceeded the objectves more than the allowable frequency identified in Section 4.3 of the listing policy. (5) Pursuant to Section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met. |
| State Board Decision Recommendation: | After review of this Regional Board decision, SWRCB staff recommend the following changes to the decision:
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 for protection of the SHELL beneficial use. |
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| LOE ID: | 44622 | ||||
| Pollutant: | Fecal Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 152 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | 0 of 152 samples exceed the criterion for Fecal Coliform. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | California Ocean Plan (SWRCB 2009) states that the single sample maximum for fecal coliform shall not exceed 400 MPN/100 mL | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Data for this line of evidence for Trinidad State Beach was collected at 1 monitoring site [ Mill Creek Trinidad] | ||||
| Temporal Representation: | Data was collected over the time period 1/2/2007-8/24/2010. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 341 | ||||
| Pollutant: | Indicator Bacteria | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 75 | ||||
| Number of Exceedances: | 4 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | Available data indicate sufficient exceedances of bacterial indicator objectives. There were 4 out of 75 exceedances of the geomean for enterococci (USEPA, 2007). | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | Title 17 C.C.R. Section 7958 states: Based on a single sample, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed:
(A) 1,000 total coliform bacteria per 100 milliliters, if the ratio of fecal/total coliform bacteria exceeds 0.1; or (B) 10,000 total coliform bacteria per 100 milliliters; or (C) 400 fecal coliform bacteria per 100 milliliters; or (D) 104 enterococcus bacteria per 100 milliliters. Based on the mean of the logarithms of the results of at least five weekly samples during any 30-day sampling period, the density of bacteria in water from any sampling station at a public beach or public water contact sports area, shall not exceed: (A) 1,000 total coliform bacteria per 100 milliliters; or (B) 200 fecal coliform bacteria per 100 milliliters; or (C) 35 enterococcus bacteria per 100 milliliters. (DHS, 1999) |
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| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Station ID# HC10 | ||||
| Temporal Representation: | 02/11/2001-10/11/2005 | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data record: 2003-2005, Humboldt County Health Dept. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 25279 | ||||
| Pollutant: | Enterococcus | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 121 | ||||
| Number of Exceedances: | 6 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | Six of the 121 single samples of enterococcus collected at Trinidad State Beach exceed the objective. Additionally, 3 of the 36 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 Humboldt County Division of Environmental Health 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 (NCRWQCB 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 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| 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 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Samples were collected at Trinidad State Beach as close as possible to the point where the creek/river meets the ocean waters in ankle to knee deep water. | ||||
| Temporal Representation: | Samples were collected weekly from January 2004 to December 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: | Quality control procedures were conducted in accordance with Humboldt County Division of Environmental Health's "Beach Act Monitoring and Notification Program" (Humboldt County 2007). | ||||
| QAPP Information Reference(s): | Beach Act Monitoring and Notification Program. Application Workplan | ||||
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| LOE ID: | 25280 | ||||
| Pollutant: | Fecal Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 38 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | None of the 38 single samples of fecal coliform collected at Trinidad State Beach exceed the objective. Additionally, none of the 12 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 Humboldt County Division of Environmental Health 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 (NCRWQCB 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 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| 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 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Samples were collected at Trinidad State Beach as close as possible to the point where the creek/river meets the ocean waters in ankle to knee deep water. | ||||
| Temporal Representation: | Samples were collected weekly from January to December 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: | Quality control procedures were conducted in accordance with Humboldt County Division of Environmental Health's "Beach Act Monitoring and Notification Program" (Humboldt County 2007). | ||||
| QAPP Information Reference(s): | Beach Act Monitoring and Notification Program. Application Workplan | ||||
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| LOE ID: | 25281 | ||||
| Pollutant: | Total Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 120 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | None of the 120 single samples of total coliform collected at Trinidad State Beach exceed the objective. Additionally, none of the 36 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 Humboldt County Division of Environmental Health 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 (NCRWQCB 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 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| 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: Total coliform density shall not exceed 1,000 MPN per 100 ml. The following standard is for the single sample maximum: (i) Total coliform density shall not exceed 10,000 per 100 ml; and (ii) Total coliform density shall not exceed 1,000 per 100 ml when the fecal coliform/total coliform ratio exceeds 0.1. *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 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Samples were collected at Trinidad State Beach as close as possible to the point where the creek/river meets the ocean waters in ankle to knee deep water. | ||||
| Temporal Representation: | Samples were collected weekly from January 2004 to December 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: | Quality control procedures were conducted in accordance with Humboldt County Division of Environmental Health's "Beach Act Monitoring and Notification Program" (Humboldt County 2007). | ||||
| QAPP Information Reference(s): | Beach Act Monitoring and Notification Program. Application Workplan | ||||
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| LOE ID: | 32712 | ||||
| Pollutant: | Enterococcus | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 108 | ||||
| Number of Exceedances: | 4 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Four of the 108 geomeans exceeded the objective. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The geometric mean standard for entercoccus states that the entercoccus density shall not exceed 35 per 100 mL. Water Quality Control Plan for Ocean Waters 2009. | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Samples were collected at Mill Creek Trinidad site. | ||||
| Temporal Representation: | Samples were collected approximately once a week from 2007 to 2010. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 32713 | ||||
| Pollutant: | Total Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 110 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Zero of the 110 geomeans exceeded the objective. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The geometric mean standard for total coliform states that the coliform density shall not exceed 1000 per 100 mL. Water Quality Control Plan for Ocean Waters 2009. | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Samples were collected at Mill Creek Trinidad site. | ||||
| Temporal Representation: | Samples were collected approximately once a week from 2007 to 2010. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 32714 | ||||
| Pollutant: | Fecal Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 110 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Zero two of the 110 geomeans exceeded the objective. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The geometric mean standard for fecal coliform states that the coliform density shall not exceed 200 MPN per 100 mL. Water Quality Control Plan for Ocean Waters (SWRCB 2009). | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Samples were collected at Mill Creek Trinidad site. | ||||
| Temporal Representation: | Samples were collected approximately once a week from 2007 to 2010. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | The samples were collected for the beach watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 44431 | ||||
| Pollutant: | Enterococcus | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 151 | ||||
| Number of Exceedances: | 5 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | 5 of 151 samples exceed the criterion for Enterococci. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | California Ocean Plan (SWRCB 2009) states that the single sample maximum for Enterococcus shall not exceed 104 MPN/100 mL. | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Data for this line of evidence for Trinidad State Beach was collected at 1 monitoring site [ Mill Creek Trinidad] | ||||
| Temporal Representation: | Data was collected over the time period 1/2/2007-8/24/2010. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 44682 | ||||
| Pollutant: | Total Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 152 | ||||
| Number of Exceedances: | 1 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | 1 of 152 samples exceed the criterion for Total Coliform. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | California Ocean Plan (2009) single sample maximum states that total coliform density shall not exceed 10,000 MPN/100 mL | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Data for this line of evidence for Trinidad State Beach was collected at 1 monitoring site [ Mill Creek Trinidad] | ||||
| Temporal Representation: | Data was collected over the time period 1/2/2007-8/24/2010. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 47608 | ||||
| Pollutant: | Total Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Shellfish Harvesting | ||||
| Number of Samples: | 152 | ||||
| Number of Exceedances: | 32 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | 32 of 152 samples exceed the objective of 230 MPN/100mL applied as a single sample maximum for Total Coliform. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The California Ocean Plan states the following: At all areas where shellfish may be harvested for human consumption, the following bacterial objectives shall be maintained throughout the water column: Ten percent of the samples collected during any 30-day period shall not exceed 230 MPN/100mL. | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Data for this line of evidence for Trinidad State Beach was collected at 1 monitoring site [Mill Creek Trinidad] | ||||
| Temporal Representation: | Data was collected over the time period 1/2/2007-8/24/2010. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 47609 | ||||
| Pollutant: | Total Coliform | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Shellfish Harvesting | ||||
| Number of Samples: | 111 | ||||
| Number of Exceedances: | 52 | ||||
| Data and Information Type: | PATHOGEN MONITORING | ||||
| Data Used to Assess Water Quality: | 52 of 111 samples exceed the objective of 70 MPN/100mL applied as a rolling 30 day geomean for Total Coliform. | ||||
| Data Reference: | Data for Region 1 Beach Watch. | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, the median total coliform density shall not exceed 70 per 100 mL. Staff applied the objective as a rolling 30 day geometric mean consistent with other state bacteria objectives and with guidance from the National Shellfish Sanitation Program from which the objectives were taken. | ||||
| Objective/Criterion Reference: | California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Data for this line of evidence for Trinidad State Beach was collected at 1 monitoring site [Mill Creek Trinidad] | ||||
| Temporal Representation: | Data was collected over the time period 1/2/2007-8/24/2010. | ||||
| Environmental Conditions: | Staff is not aware of any special conditions that might affect interpretation of the data. | ||||
| QAPP Information: | The samples were collected for the Beach Watch program. | ||||
| QAPP Information Reference(s): | |||||