Draft California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 4 - Los Angeles Region

Water Body Name:	Rincon Beach
Water Body ID:	CAX4010001020020131134348
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	75915	Region 4
Rincon Beach

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)(2016)
Revision Status	Revised
Sources:	Onsite Wastewater Systems (Septic Tanks)
Expected TMDL Completion Date:	2020
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA 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. 27 lines of evidence are available in the administrative record to assess this pollutant. Use of data assessed against the shellfish standard is inappropriate at this time and will not be considered in the final decision. Only 12 lines of evidence will be considered, because those lines of evidence already include all the data used from the other lines of evidence. 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 CWA 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. 507 of 2067, 159 of 1843, and 242 of 2283 samples exceeded the OBJECTIVE and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. 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 not be removed from the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

28186

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:

Four out of 65 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.

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:

The Ventura County Environmental Health Division conducted sampling at Rincon Beach at beach monitoring station VC1100, located at the end of footpath to the beach (Lat: 34.37537, Long: -119.47304).

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):

California Code of Regulations Title 17, sections 7958-7960.

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

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

3509

Pollutant:

Indicator Bacteria

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

A TMDL and implementation plan has been approved for this water segment-pollutant combination. The Santa Monica Bay Bacteria Dry Weather TMDL was approved by RWQCB on January 24, 2002 and subsequently approved by USEPA. The Santa Monica Bay Bacteria Wet Weather TMDL was approved by RWQCB on December 12, 2002 and approved by USEPA on June 19, 2003.

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

3511

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

101

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Data used to assess water quality 101 samples, 15 samples exceeding (SWRCB, 2003).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

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:

1 station: VC(1100). This station represents the beach 50 yards on either
side of the sampling point. Samples collected at the end of the footpath.

Temporal Representation:

Data collected in 1999, 2000, and 2001.

Environmental Conditions:

QAPP Information:

County Health Department.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

28185

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:

Six out of 96 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and two out of 22 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:

The Ventura County Environmental Health Division conducted sampling at Rincon Beach at beach monitoring station VC1100, located at the end of footpath to the beach (Lat: 34.37537, Long: -119.47304).

Temporal Representation:

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

California Code of Regulations Title 17, sections 7958-7960.

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

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

28184

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

198

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

11 out of 198 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and six out of 45 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:

The Ventura County Environmental Health Division conducted sampling at Rincon Beach at beach monitoring station VC1050, located at the flagpole 100 yards south of the mouth of Rincon Creek (Lat: 34.37389, Long: -119.47494).

Temporal Representation:

Grab samples were taken and analyzed on a weekly basis from January 2003 to February 2007.

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

QAPP Information Reference(s):

California Code of Regulations Title 17, sections 7958-7960.

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

3510

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

107

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

107 samples, 26 samples exceeding (SWRCB, 2003).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

1 station: VC(1000). This station represents the beach 50 yards on either
side of the sampling point. Sample were collected 50 yards from the mouth of the creek.

Temporal Representation:

Data collected in 1999, 2000, and 2001.

Environmental Conditions:

QAPP Information:

County Health Department.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

28183

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:

Seven out of 35 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and five 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.

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:

The Ventura County Environmental Health Division conducted sampling at Rincon Beach at beach monitoring station VC1000, located 25 yards south of the mouth of Rincon Creek (Lat: 34.37328, Long: -119.47652).

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

QAPP Information Reference(s):

California Code of Regulations Title 17, sections 7958-7960.

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

3512

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

104

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

104 samples, 23 samples exceeding (SWRCB, 2003).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

1 station: VC(1050). This station represents the beach 50 yards on either
side of the sampling point. Sampled collected 150 yards south of the creek's mouth.

Temporal Representation:

Data collected in 1999, 2000, and 2001.

Environmental Conditions:

QAPP Information:

County Health Department.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

87351

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

300

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Rincon Beach to determine beneficial use support and results are as follows: 30 of 300 samples exceed the criterion for Coliform, Total.

Data Reference:

Data for Region 4 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 per 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 Rincon Beach was collected at 3 monitoring sites [ Rincon Beach - Creek Mouth, Rincon Beach - Flagpole, Rincon Beach - Footpath]

Temporal Representation:

Data was collected over the time period 3/5/2007-8/30/2010.

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):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

87352

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

110

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Forty-eight of the 110 geomeans exceeded the objective.

Data Reference:

Data for Region 4 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 from Rincon Beach - Flagpole and Rincon Creek (mouth). These sites are located within 200 meters and results collected on the same day were averaged.

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):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

87347

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

300

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Rincon Beach to determine beneficial use support and results are as follows: 32 of 300 samples exceed the criterion for Enterococci.

Data Reference:

Data for Region 4 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2009) single sample maximum states that enterococcus density shall not exceed 104 per 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 Rincon Beach was collected at 3 monitoring sites [ Rincon Beach - Creek Mouth, Rincon Beach - Flagpole, Rincon Beach - Footpath]

Temporal Representation:

Data was collected over the time period 3/5/2007-8/30/2010.

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):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

87348

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

110

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Fifty-two of the 110 geomeans exceeded the objective.

Data Reference:

Data for Region 4 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 from Rincon Beach - Flagpole and Rincon Creek (mouth). These sites are located within 200 meters and results collected on the same day were averaged.

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):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133533

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

788

Number of Exceedances:

142

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

142 of the 788 geometric means exceeded the objective.The samples were collected during dry weather from April through October in 1999 and from 2005 to 2008. Samples were collected year-round from 2000 to 2004 and 2009 to 2017. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum protective bacteriological standards for waters adjacent to public beaches and public water-contact sports areas shall be as follows: (1) Based on the six-week rolling geometric mean standard, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed: 30 enterococci bacteria per 100 milliliters, generally not less than five samples calculated weekly.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach 25 yards south of the mouth of Rincon Creek (1000).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2017.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133535

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

571

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

58 of the 571 geometric means exceeded the objective.The samples were collected during dry weather from April through October in 1999, 2004, and 2008 to 2014. Samples were collected year-round from 2000 to 2003 and 2005 to 2007. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach at the flagpole 100 yards south of the mouth of Rincon Creek (1050).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2014.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133536

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

422

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

22 of the 422 geometric means exceeded the objective. The samples were collected during dry weather from April through October in 1999, 2004 to 2008, and 2015 to 2017. Samples were collected year-round from 2000 to 2003. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach at the end of footpath to the beach (1100).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2008 and 2015 to 2017.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133534

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

286

Number of Exceedances:

285

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

285 of the 286 geometric means exceeded the objective.The samples were collected during dry weather from April through October in 1999 and from 2004 to 2008. Samples were collected year-round from 2000 to 2003. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach 50 yards south of the mouth of Rincon Creek (1001).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2008.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

87349

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

300

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Rincon Beach to determine beneficial use support and results are as follows: 14 of 300 samples exceed the criterion for Coliform, Fecal.

Data Reference:

Data for Region 4 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2009) single sample maximum states that fecal coliform density shall not exceed 400 per 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 Rincon Beach was collected at 3 monitoring sites [ Rincon Beach - Creek Mouth, Rincon Beach - Flagpole, Rincon Beach - Footpath]

Temporal Representation:

Data was collected over the time period 3/5/2007-8/30/2010.

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):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

87350

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

110

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Eleven of the 110 geomeans exceeded the objective.

Data Reference:

Data for Region 4 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 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 from Rincon Beach - Flagpole and Rincon Creek (mouth). These sites are located within 200 meters and results collected on the same day were averaged.

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):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133529

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

787

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

12 of the 787 geometric means exceeded the objective. The samples were collected during dry weather from April through October in 1999 and from 2005 to 2008. Samples were collected year-round from 2000 to 2004 and 2009 to 2017. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

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 the 30-day geometric mean standard, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed: 200 fecal coliform bacteria per 100 milliliters, calculated based on the five most recent samples.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach 25 yards south of the mouth of Rincon Creek (1000).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2017.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133530

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

170

Number of Exceedances:

144

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

144 of the 170 geometric means exceeded the objective. The samples were collected during dry weather from April through October in 1999 and from 2004 to 2008. Samples were collected year-round from 2000 to 2003. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

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 the 30-day geometric mean standard, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed: 200 fecal coliform bacteria per 100 milliliters, calculated based on the five most recent samples.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach 50 yards south of the mouth of Rincon Creek (1001).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2008.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133531

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

519

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

3 of the 519 geometric means exceeded the objective. The samples were collected during dry weather from April through October in 1999, 2004, and 2008 to 2014. Samples were collected year-round from 2000 to 2003 and 2005 to 2007. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

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 the 30-day geometric mean standard, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed: 200 fecal coliform bacteria per 100 milliliters, calculated based on the five most recent samples.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach at the flagpole 100 yards south of the mouth of Rincon Creek (1050).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2014.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133532

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

367

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

0 of the 367 geometric means exceeded the objective. The samples were collected during dry weather from April through October in 1999, 2004 to 2008, and 2015 to 2017. Samples were collected year-round from 2000 to 2003. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

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 the 30-day geometric mean standard, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed: 200 fecal coliform bacteria per 100 milliliters, calculated based on the five most recent samples.

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach at the end of footpath to the beach (1100).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2008 and 2015 to 2017.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133518

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

328

Number of Exceedances:

181

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

181 of the 328 single sample exceeded the objective. The samples were collected during dry weather from April through October in 1999 and from 2004 to 2008. Samples were collected year-round from 2000 to 2003. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach 50 yards south of the mouth of Rincon Creek (1001).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2008.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133517

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

861

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

38 of the 861 single sample exceeded the objective. The samples were collected during dry weather from April through October in 1999 and from 2005 to 2008. Samples were collected year-round from 2000 to 2004 and 2009 to 2017. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach 25 yards south of the mouth of Rincon Creek (1000).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2017.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133519

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

633

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

16 of the 633 single sample exceeded the objective. The samples were collected during dry weather from April through October in 1999, 2004, and from 2008 to 2014. Samples were collected year-round from 2000 to 2003 and 2005 to 2007. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach at the flagpole 100 yards south of the mouth of Rincon Creek (1050).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2014.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

133528

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

461

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

7 of the 461 single sample exceeded the objective. The samples were collected during dry weather from April through October in 1999, 2004 to 2008, and 2015 to 2017. Samples were collected year-round from 2000 to 2003. According to the listing Policy section 4.2, a 10 percent exceedance frequency should be used.

Data Reference:

County of Ventura coastal beach bacteria monitoring data for AB411 1998 to 2017. Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Amendment to the Water Quality Control Plan for Ocean Waters of California - Bacteria Provisions and a Water Quality Standards Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from Rincon Beach at the end of footpath to the beach (1100).

Temporal Representation:

Samples were collected approximately once a week from 1998 to 2008 and 2015 to 2017.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 75915, Indicator Bacteria	Region 4
Rincon Beach

LOE ID:

28182

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

150

Number of Exceedances:

Data and Information Type:

Other Agencies/Organizations provided monitoring data

Data Used to Assess Water Quality:

21 out of 150 samples exceeded the Basin Plan single sample water quality objectives for indicator bacteria in marine water and 12 out of 32 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:

Temporal Representation:

Grab samples were taken and analyzed on a weekly basis from January 2003 to October 2005.