Draft 2008 California 303(d)/305(b) Integrated Report

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name: San Buenaventura Beach
Water Body ID: CAC4021000020070614140217
Water Body Type: Coastal & Bay Shoreline
 
DECISION ID
4864
 
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)(2006)
Revision Status Revised
Sources: Unknown Nonpoint Source | Unknown Point Source
Expected TMDL Completion Date: 2015
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is 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 is necessary to assess listing status.

13 lines of evidence are available in the administrative record to assess this pollutant. Data from line of evidence (LOE) 3514 through 3518 will not be considered in this decision due to LOE 27996 through 28003 including all the data along with newer data.

A 19% exceedance percentage was used for water quality monitoring conducted between April 01 through October 31 (summer months) only. Section 4.3 of the Listing Policy does not describe the use of a more stringent exceedance percentage for summer only monitoring, though one is inferred. As such, the referenced data set was analyzed in two portions and described in two separate LOEs due to differing sampling time frames.

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.

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. 28 of 288 samples, sampled year-round, from monitoring station VC18000 exceeded the updated Basin Plan single sample water quality objectives, 7 of 64 samples exceeded the geometric mean objectives for indicator bacteria, and this does not exceed the allowable frequency listed in Table 4.2 of the Listing Policy.
4. 3 of 63 samples from station VC18000 exceeded the single sample objectives, and this does not exceed the allowable frequency for monitoring in the summer months only. 0 of 14 samples exceeded the geometric mean objectives and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are met. A minimum of 26 samples in needed for application of table 4.2, utilizing a 19% exceedance percentage.
5. 61 of 354 samples, sampled year-round, from station VC19000 exceeded the single sample objectives, 24 of 76 samples exceeded the geometric mean objectives, and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy for single sample and geometric means.
6. 2 of 34 samples from station VC19000 exceeded the single sample objectives, and this does not exceed the allowable frequency for monitoring in the summer months only. 1 of 7 samples exceeded the geometric mean objectives and this sample size is insufficient to determine if standards are met.
7. 16 of 286 samples, sampled year-round, from station VC20000 exceeded the single sample objectives, 5 of 64 samples exceeded the geometric mean objectives, and this does not exceed the allowable frequency listed in Table 4.2 of the Listing Policy.
8. 2 of 63 samples from station VC20000 exceeded the single sample objectives, and this does not exceed the allowable frequency based on monitoring in the summer months only. 1 of 14 samples exceeded the geometric mean objectives and this sample size is insufficient to determine if standards are met.
9. 12 of 282 samples, sampled year-round, from station VC21000 exceeded the single sample objectives, 3 of 64 samples exceeded the geometric mean objectives, and this does not exceed the allowable frequency listed in Table 4.2 of the Listing Policy.
10. 3 of 64 samples from station VC21000 exceeded the single sample objectives, and this does not exceed the allowable frequency based on monitoring in the summer months only. 0 of 14 samples exceeded the geometric mean objectives and this sample size is insufficient to determine if standards are met.
11. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are 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:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 4864
 
LOE ID: 28003
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 64
Number of Exceedances: 3
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: Three out of 64 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and zero out of 14 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC21000, located south of Weymouth Lane drain (Lat: 34.2569, Long: -119.27153).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from April 2005 to October 2006.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 28002
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 282
Number of Exceedances: 12
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: 12 out of 282 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and three out of 64 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC21000, located south of Weymouth Lane drain (Lat: 34.2569, Long: -119.27153).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from July 1999 to October 2004.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 28001
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 63
Number of Exceedances: 2
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: Two out of 63 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and one out of 14 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC20000, located south of Dover Lane drain (Lat: 34.26586, Long: -119.27786).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from April 2005 to October 2006.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 28000
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 286
Number of Exceedances: 16
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: 16 out of 286 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and five out of 64 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC20000, located south of Dover Lane drain (Lat: 34.26586, Long: -119.27786).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from July 1999 to October 2004.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 27999
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 34
Number of Exceedances: 2
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: Two out of 34 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and one out of seven samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC19000, located south of San Jon Road drain (Lat: 34.272, Long: -119.28562).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from April 2006 to October 2006.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 27998
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 354
Number of Exceedances: 61
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: 61 out of 354 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and 24 out of 76 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC19000, located south of San Jon Road drain (Lat: 34.272, Long: -119.28562).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from July 1999 to October 2005.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 27997
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 63
Number of Exceedances: 3
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: Three out of 63 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water. zero out of 14 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC18000, located south of Kalorama St. drain (Lat: 34.27361, Long: -119.28883).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from April 2005 to October 2006 in the summer months of April to October.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 27996
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 288
Number of Exceedances: 28
 
Data and Information Type: Other Agencies/Organizations provided monitoring data
Data Used to Assess Water Quality: 28 out of 288 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and seven out of 64 samples exceeded the Basin Plan geometric mean water quality objectives. Water quality samples were taken and analyzed for indicator bacteria consistent with California Code of Regulations Title 17, sections 7958-7961 and related guidance issued by California Department of Public Health .
Data Reference: County of Ventura coastal beach bacteria monitoring data for AB411.
 
Water Quality Objective/Criterion: The Basin Plan bacteria objectives state that to protect water contact recreation in marine waters individual samples shall not exceed the following limits: the total coliform density shall not exceed 10000/100 ml; the fecal coliform density shall not exceed 400/100 ml; the enterococcus density shall not exceed 104/100 ml; and the total coliform density shall not exceed 1,000/100 ml, if the ratio of fecal-to-total coliform exceeds 0.1 as single samples. The bacteria objectives also establish that the geometric means of individual samples shall not exceed the following limits: the total coliform density shall not exceed 1000/100 ml, the fecal coliform density shall not exceed 200/100 ml, and the enterococcus density shall not exceed 35/100 ml, as a geometric mean. The bacteria objectives are found in Attachment A of Regional Board Resolution No. 2001-018.
Objective/Criterion Reference: Water Quality Control Plan Los Angeles Region R4 Basin Plan
  Basin Plan Amendments to the Water Quality Control Plan Los Angeles Region R4 Basin Plan as of 02/02/2009
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The Ventura County Environmental Health Division conducted sampling at San Buenaventura Beach at beach monitoring station VC18000, located south of Kalorama St. drain (Lat: 34.27361, Long: -119.28883).
Temporal Representation: Grab samples were taken and analyzed on a weekly basis from July 1999 to October 2004.
Environmental Conditions:
QAPP Information: Data was collected in compliance with the sampling and testing procedures detailed in the California Department of Public Health related guidance.
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
  California Code of Regulations Title 17, sections 7958-7960.
 
LOE ID: 3518
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 1195
Number of Exceedances: 95
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Available data indicate sufficient exceedances of bacterial indicator objectives. There were 95 out of 1195 exceedances of the geomean for total coliform, and 84 out of 1194 exceedances of the geomean for enterococci (USEPA, 2007).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: Title 17 C.C.R. Section 7958 states that 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)
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Four sampling locations: VC18000-South of drain at Kalorama; VC19000-South of drain at San Jon Road; VC2000-South of drain at Dover Lane; VC21000-South of drain at Weymouth.
Temporal Representation: 07/12/1999-10/31/2005
Environmental Conditions:
QAPP Information: Data record: 1999-2005, Ventura County Health Dept.
QAPP Information Reference(s):
 
LOE ID: 3517
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 101
Number of Exceedances: 14
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: One-hundred and one samples, 14 samples exceeding (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 17 CCR 7958 (in part): The minimum protective bacteriological standards for waters adjacent to public beaches and public water-contact sports areas shall be as follows:
(1) 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.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: One station: VC(18000). This station represents the beach 50 yards on either side of the sampling point. Samples were collected between Kalorama Street and Sanjon testing sites.
Temporal Representation: Data collected in 1999, 2000, and 2001.
Environmental Conditions:
QAPP Information: County Health Department.
QAPP Information Reference(s):
 
LOE ID: 3516
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 100
Number of Exceedances: 8
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: One-hundred samples, 8 samples exceeding (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 17 CCR 7958 (in part): The minimum protective bacteriological standards for waters adjacent to public beaches and public water-contact sports areas shall be as follows:
(1) 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.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: One station: VC(20000). This station represents the beach 50 yards on either side of the sampling point. Samples were collected south of drain at Dover Lane.
Temporal Representation: Data collected in 1999, 2000, and 2001.
Environmental Conditions:
QAPP Information: County Health Department.
QAPP Information Reference(s):
 
LOE ID: 3515
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 103
Number of Exceedances: 20
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: One-hundred and three samples, 20 samples exceeding (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 17 CCR 7958 (in part): The minimum protective bacteriological standards for waters adjacent to public beaches and public water-contact sports areas shall be as follows:
(1) 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.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: One station: VC(19000). This station represents the beach 50 yards on either side of the sampling point. Samples were collected south of the drain at San Jon Road.
Temporal Representation: Data collected in 1999, 2000, and 2001.
Environmental Conditions:
QAPP Information: Samples were collected by the County Health Department.
QAPP Information Reference(s):
 
LOE ID: 3514
 
Pollutant: Indicator Bacteria
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 97
Number of Exceedances: 2
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Ninety-seven samples, 2 samples exceeding (SWRCB, 2003).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: 17 CCR 7958 (in part): The minimum protective bacteriological standards for waters adjacent to public beaches and public water-contact sports areas shall be as follows:
(1) 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.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: One station: VC(20000). This station represents the beach 50 yards on either side of the sampling point. Samples were collected south of drain at Weymouth.
Temporal Representation: Data collected in 1999, 2000, and 2001.
Environmental Conditions:
QAPP Information: County Health Department.
QAPP Information Reference(s):