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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Little Corona Del Mar Beach
Water Body ID:	CAX8011400020021003092240
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	97136	Region 8
Little Corona Del Mar Beach

Pollutant:	Indicator Bacteria
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2029
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. Twelve (12) lines of evidence are available in the administrative record to assess this pollutant. Thirty Three (33) of 128 samples exceed the Enterococcus Geomean Objective. Twenty Six (26) of 170 samples exceed the Enterococcus Single Sample Objective. Zero (0) of 144 samples exceed the Fecal Coliform Geomean Objective. Five (5) of 170 samples exceed the Fecal Coliform Single Sample Objective. Two (2) of 144 samples exceed the Total Coliform Geomean Objective. Zero (0) of 170 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 for 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. Thirty Three (33) of the 128 samples exceed the Enterococcus Geomean Objective, Zero (0) of the 144 samples exceed the Fecal Coliform Geomean Objective, Two (2) of the 144 samples exceed the Total Coliform Geomean, and the Enterococcus Geomean does exceed the frequency listed in table 3.2 4. Twenty Six (26) of the 170 samples exceed the Enterococcus Single Sample Objective, Five (5) of the 170 samples exceed the Fecal Coliform Single Sample Objective, Zero (0) of the 170 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

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 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

81708

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Little Corona Del Mar Beach to determine beneficial use support and results are as follows: 0 of 22 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 Little Corona Del Mar Beach was collected at 1 monitoring site [ Little Corona]

Temporal Representation:

Data was collected over the time period 2/5/2009-10/27/2009.

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 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

95689

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

148

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Twenty-six of the 148 samples exceeded the entercoccus objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. These results represent the higher of the two values.

Data Reference:

Data for Various Waterbodies in Region 8 and Region 9, 2006-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The single sample entercoccus concentration shall not exceed more than 104/100ml. Water Quality Control Plan for Ocean Waters of California.

Guideline Reference:

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

Spatial Representation:

The samples were collected from Buck Gully Creek (surfzone downcoast and surfzone upcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

81709

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

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:

Zero of the eleven 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 Little Corona station.

Temporal Representation:

Samples were collected from February to October 2009.

Environmental Conditions:

QAPP Information:

The samples were collected for the beach watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

95690

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

133

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Sixty-two of the 133 samples exceeded the entercoccus objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. The higher of the two values was used for the geomean calculation.

Data Reference:

Data for Various Waterbodies in Region 8 and Region 9, 2006-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The geometric mean for entercoccus shall not exceed more than 35/100ml. Water Quality Control Plan for Ocean Waters of California.

Guideline Reference:

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

Spatial Representation:

The samples were collected from Buck Gully Creek (surfzone downcoast and surfzone upcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

95691

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

148

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Five of the 148 samples exceeded the total coliform objective.For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. These results represent the higher of the two values.

Data Reference:

Data for Various Waterbodies in Region 8 and Region 9, 2006-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The single sample fecal coliform concentration shall not exceed more than 400/100ml. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Buck Gully Creek (surfzone downcoast and surfzone upcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

81716

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

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:

Zero of the eleven 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 Little Corona station.

Temporal Representation:

Samples were collected from February to October 2009.

Environmental Conditions:

QAPP Information:

The samples were collected for the beach watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

81714

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

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:

Zero of the eleven 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 Little Corona station.

Temporal Representation:

Samples were collected from February to October 2009.

Environmental Conditions:

QAPP Information:

The samples were collected for the beach watch program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

95692

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

133

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Three of the 133 samples exceeded the entercoccus objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. The higher of the two values was used for the geomean calculation.

Data Reference:

Data for Various Waterbodies in Region 8 and Region 9, 2006-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The geometric mean for fecal coliform shall not exceed more than 200/100ml. Water Quality Control Plan for Ocean Waters of California.

Guideline Reference:

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

Spatial Representation:

The samples were collected from Buck Gully Creek (surfzone downcoast and surfzone upcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

95693

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

148

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 148 samples exceeded the total coliform objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. These results represent the higher of the two values.

Data Reference:

Data for Various Waterbodies in Region 8 and Region 9, 2006-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The single sample total coliform concentration shall not exceed more than 10,000/100ml. Water Quality Control Plan for Ocean Waters of California.

Guideline Reference:

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

Spatial Representation:

The samples were collected from Buck Gully Creek (surfzone downcoast and surzone upcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

81715

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Little Corona Del Mar Beach to determine beneficial use support and results are as follows: 0 of 22 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 Little Corona Del Mar Beach was collected at 1 monitoring site [ Little Corona]

Temporal Representation:

Data was collected over the time period 2/5/2009-10/27/2009.

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 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

95694

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

133

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Two of the 133 samples exceeded the entercoccus objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. The higher of the two values was used for the geomean calculation.

Data Reference:

Data for Various Waterbodies in Region 8 and Region 9, 2006-2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Santa Ana Region Basin Plan.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The geometric mean for total coliform shall not exceed more than 1000/100ml. Water Quality Control Plan for Ocean Waters of California.

Guideline Reference:

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

Spatial Representation:

The samples were collected from Buck Gully Creek (surfzone downcoast and surfzone upcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 97136, Indicator Bacteria	Region 8
Little Corona Del Mar Beach

LOE ID:

81713

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed BeachWatch data for Little Corona Del Mar Beach to determine beneficial use support and results are as follows: 0 of 22 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 Little Corona Del Mar Beach was collected at 1 monitoring site [ Little Corona]

Temporal Representation:

Data was collected over the time period 2/5/2009-10/27/2009.

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):