Final California 2010 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name:	Oxnard Beach
Water Body ID:	CAC4031100020090226102039
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	16270	Region 4
Oxnard Beach

Pollutant:	Indicator Bacteria
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

Regional Board Conclusion:	This pollutant 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. Section 3.3 of the Listing Policy states that a 4 % exceedance percentage shall be used when water quality monitoring was conducted between April 01 through October 31 (summer months) only. As such the referenced data set was analyzed in two portions and described in two separate LOEs due to differing sampling data time frames. For summer months samples geometric mean values were calculated but not used due to an insufficient number of values necessary to re-run the binomial test in the Listing Policy for 4 % exceedance. Table 3.2 of the listing policy states that a minimum of 26 samples is required to apply the binomial test. A sample size of fewer than 26 is insufficient to determine with the power and confidence of the Listing Policy if standards are met. Eight 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 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. For year-round samples from station VC29000: two of 94 exceeded the single sample updated Basin Plan water quality objective for indicator bacteria (WQO) and zero of 22 exceeded the geometric mean WQO and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. For summer months samples from station VC29000: one of 61 exceeded the single sample WQO and this does not exceed the allowable frequency described in Section 3.3 of the Listing Policy. zero of 14 exceeded the geometric mean (WQO) and as stated above this sample size is insufficient to determine if standards are met. 5. For year-round samples from station VC29500: three of 94 exceeded the single sample WQO and one of 22 exceeded the geometric mean WQO and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 6. For summer months samples from station VC29500: zero of 60 exceeded the single sample WQO and this does not exceed the allowable frequency described in Section 3.3 of the Listing Policy. Zero of 14 exceeded the geometric mean WQO and as stated above this sample size is insufficient to determine if standards are met. 7. For year-round samples from station VC30000: three of 93 exceeded the single sample WQO and zero of 22 exceeded the geometric mean WQO and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 8. For summer months samples from station VC30000: three of 64 exceeded the single sample WQO and this does not exceed the allowable frequency described in Section 3.3 of the Listing Policy. Zero of 14 exceeded the geometric mean WQO and as stated above this sample size is insufficient to determine if standards are met. 9. For year-round samples from station VC31000: two of 94 exceeded the single sample WQO and zero of 22 exceeded the geometric mean WQO and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 10. For summer months samples from station VC31000: zero of 61 exceeded the single sample WQO and this does not exceed the allowable frequency described in Section 3.3 of the Listing Policy. Zero of 14 exceeded the geometric mean WQO and as stated above this sample size is insufficient to determine if standards are met. 11. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27838

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

0 of 61 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water. 0 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.

SWAMP Data:

Non-SWAMP

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC29000) located south of 5th Street drain. (Lat: 34.19788, Long: -119.24868).

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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27837

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

2 of 94 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and 0 out of 22 samples exceeded the geometric mean limits. 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.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC29000) located south of 5th Street drain. (Lat: 34.19788, Long: -119.24868).

Temporal Representation:

Grab samples were taken and analyzed on a weekly basis from January 2003 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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27844

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC31000) located south of the drain at the end of Amalfi Way. (Lat: 34.18518, Long: -119.24179).

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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27842

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

3 of 64 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water. 0 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.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC30000) located south of the drain at end of Outrigger Way. (Lat: 34.19034, Long: -119.24457).

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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27841

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

3 of 93 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and 0 out of 22 samples exceeded the geometric mean limits. 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.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC30000) located south of the drain at end of Outrigger Way. (Lat: 34.19034, Long: -119.24457).

Temporal Representation:

Grab samples were taken and analyzed on a weekly basis from January 2003 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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27839

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

3 of 94 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and 1 out of 22 samples exceeded the geometric mean limits. 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.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC29500) located south of Channel Way drain. (Lat: 34.19532, Long: -119.24742).

Temporal Representation:

Grab samples were taken and analyzed on a weekly basis from January 2003 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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27840

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

0 of 60 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water. 0 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.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC29500) located south of Channel Way drain. (Lat: 34.19532, Long: -119.24742).

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.

Line of Evidence (LOE) for Decision ID 16270, Indicator Bacteria	Region 4
Oxnard Beach

LOE ID:

27843

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Water Quality Control Plan Los Angeles Region R4 Basin Plan

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

One Ventura County Environmental Health Division sampling location (VC31000) located south of the drain at the end of Amalfi Way. (Lat: 34.18518, Long: -119.24179).

Temporal Representation:

Grab samples were taken and analyzed on a weekly basis from January 2003 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.