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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Corona del Mar State Beach
Water Body ID:	CAX8011100019991013152236
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	96961	Region 8
Corona del Mar State Beach

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Six (6) lines of evidence are available in the administrative record to assess this pollutant. Zero (0) of 144 samples exceed the Enterococcus Geomean Objective. Six (6) of 155 samples exceed the Enterococcus Single Sample Objective. Zero (0) of 146 samples exceed the Fecal Coliform Geomean Objective. Zero (0) of 156 samples exceed the Fecal Coliform Single Sample Objective. Zero (0) of 146 samples exceed the Total Coliform Geomean Objective. Zero (0) of 156 samples exceed the Total Coliform Single Sample Objective. 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 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. Zero (0) of the 144 samples exceed the Enterococcus Geomean Objective, Zero (0) of the 146 samples exceed the Fecal Coliform Geomean Objective, Zero (0) of the 146 samples exceed the Total Coliform Geomean, and this does not exceed the frequency listed in table 3.2 4. Six (6) of the 155 samples exceed the Enterococcus Single Sample Objective, Zero (0) of the 156 samples exceed the Fecal Coliform Single Sample Objective, Zero (0) of the 156 samples exceed the Total Coliform Single Sample, and this does not exceed the frequency listed in table 3.2 5. 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.

Line of Evidence (LOE) for Decision ID 96961, Indicator Bacteria	Region 8
Corona del Mar State Beach

LOE ID:

81402

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

156

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Corona del Mar State Beach to determine beneficial use support and results are as follows: 0 of 156 samples exceed the criterion for Coliform, Fecal.

Data Reference:

Data for Region 8 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 Corona del Mar State Beach was collected at 1 monitoring site [ Corona Del Mar]

Temporal Representation:

Data was collected over the time period 1/2/2009-8/30/2010.

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 96961, Indicator Bacteria	Region 8
Corona del Mar State Beach

LOE ID:

81401

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

144

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 144 geomeans exceeded the objective.

Data Reference:

Data for Region 8 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The standard for enterococcus states that the density shall not exceed 35 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Corona Del Mar.

Temporal Representation:

Samples were collected approximately once a week from January 2009 to January 2010 and twice in August 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 96961, Indicator Bacteria	Region 8
Corona del Mar State Beach

LOE ID:

81400

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

155

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Corona del Mar State Beach to determine beneficial use support and results are as follows: 6 of 155 samples exceed the criterion for Enterococci.

Data Reference:

Data for Region 8 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 Corona del Mar State Beach was collected at 1 monitoring site [ Corona Del Mar]

Temporal Representation:

Data was collected over the time period 1/2/2009-8/30/2010.

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 96961, Indicator Bacteria	Region 8
Corona del Mar State Beach

LOE ID:

81405

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

146

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 146 geomeans exceeded the objective.

Data Reference:

Data for Region 8 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The standard for total coliform states that the coliform density shall not exceed 1000 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Corona Del Mar.

Temporal Representation:

Samples were collected approximately once a week from January 2009 to January 2010 and twice in August 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 96961, Indicator Bacteria	Region 8
Corona del Mar State Beach

LOE ID:

81403

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

146

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 146 geomeans exceeded the objective.

Data Reference:

Data for Region 8 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The standard for fecal coliform states that the coliform density shall not exceed 400 per 100 mL. Water Quality Control Plan for Ocean Waters 2009.

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at Corona Del Mar.

Temporal Representation:

Samples were collected approximately once a week from January 2009 to January 2010 and twice in August 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 96961, Indicator Bacteria	Region 8
Corona del Mar State Beach

LOE ID:

81404

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

156

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Corona del Mar State Beach to determine beneficial use support and results are as follows: 0 of 156 samples exceed the criterion for Coliform, Total.

Data Reference:

Data for Region 8 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 Corona del Mar State Beach was collected at 1 monitoring site [ Corona Del Mar]

Temporal Representation:

Data was collected over the time period 1/2/2009-8/30/2010.

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):