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

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle
Water Body ID:	CAC9011300020090525212958
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	76063	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Agriculture \| Municipal Point Sources \| Other
TMDL Name:	Bacteria Impaired Waters I (creeks and beach shorelines)
TMDL Project Code:	169
Date TMDL Approved by USEPA:	06/22/2011
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	In 2006, 'Pacific Ocean Shoreline, Aliso HSA' was listed for Indicator Bacteria. For 2008, the 2006 Aliso HSA segment has been split into smaller segments that each represent an area near the sampling location of the data being assessed. 'Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach middle' is one of the sampling locations for Pacific Ocean Shoreline, Aliso HSA and is considered to be part of the original listing. This pollutant is being considered for removal from the section 303(d) list under section 4.3 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. Two hundred-one of the 994 samples exceed the water quality objective for Shellfish Harvesting. Nineteen out of 108 samples exceeded the contact recreation objective for Enterococcus, and Zero out of 108 samples exceeded the contact recreation objective for Fecal Coliform. In LOEs 29720 and 29723, 29729, 29726 the Regional Board calculated exceedances for samples taken only during storm events. This information was not used in determining listing decisions, but is of interest to the Regional Board and has been included as additional anecdotal information. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two hundred-one of the 994 samples exceed the water quality objective for Shellfish Harvesting. Nineteen out of 108 samples exceeded the contact recreation objective for Enterococcus, and Zero out of 108 samples exceeded the contact recreation objective for Fecal Coliform 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. Board Review and Conclusion: The geomeans for LOE 31082 were calculated incorrectly. State Water Board staff corrected the error. This does not change the decision.

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:	Board Review and Conclusion: The geomeans for LOE 31082 were calculated incorrectly. State Water Board staff corrected the error. This does not change the decision.

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 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29720

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2006. The total number of single samples collected was 994. From March 2002 through December 2007, 49 samples were associated with storm events. Of the 49 samples, 33 exceeded the single sample maximum water quality objective. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan, the median total coliform density shall not exceed 70 per 100 ml, and not more than 10 percent of the samples shall exceed 230 per 100 ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

Comparisons were made for all data and data associated with storm events. A storm event was defined as 0.2 inches of rainfall within a 72 hour period.

Analyzing only storm water bacteria data is important because the majority of beach monitoring data covers the months of April through October. Bacteria monitoring data may not capture the full impacts of seasonal storm events and high bacteria levels due to storm water runoff because much of the wet season for Southern California occurs in November through March.

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29727

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

982

Number of Exceedances:

119

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2007. The number of samples collected was 982 for enterococcus. Of the 982 samples, 119 exceeded the water contact recreation single sample maximum objective.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

Single Sample Maximum: Enterococcus density shall not exceed 104 per 100 ml;

Geomean: Enterococcus density shall not exceed 35 per 100 ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29723

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:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2007. The number of samples collected was 994 with 49 samples correlated with a storm event. From the 49 samples, seven exceeded the single sample water quality objective. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Total coliform density shall not exceed 10,000 per 100ml;

Geomean: Total coliform density shall not exceed 1,000 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29721

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

994

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2007. The number of samples collected was 994. From the 994 samples, 16 exceeded the single sample maximum water quality objective.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Total coliform density shall not exceed 10,000 per 100ml;

Geomean: Total coliform density shall not exceed 1,000 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29722

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

108

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2007. The number of samples collected was 994 and 108 monthly geomeans calculated. None of the geomeans exceeded the geomean water quality objective.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Total coliform density shall not exceed 10,000 per 100ml;

Geomean: Total coliform density shall not exceed 1,000 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

31082

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:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Orange County collected Beach monitoring data within the time period from January 1999 through December 2006.
A total of 56 monthly geomeans were calculated for data collected during the time frame of April 1st to October 31st (AB411 data) within the aforementioned time period. Of the 56 geomeans 0 exceeded the geomean water quality objective.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Total coliform density shall not exceed 1,000 per 100ml within any 30 day period (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected at least once a week within the time period from January 1999 through December 2006.
The data assessed is AB411 data which is data collected during the time frame of April 1st to October 31st (summer months) within the aforementioned time period.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

31084

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:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:
Geomean: Enterococcus density shall not exceed 35 per 100 ml within any 30 day period (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29729

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:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected my the County of Orange from January 1999 through December 2007. There were 893 single samples collected. Between March 2002 and December 2007, 51 samples were correlated with storm events. Of the 51 storm event samples, 25 exceeded the water contact recreation single sample water quality objective for enterococcus. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

Single Sample Maximum: Enterococcus density shall not exceed 104 per 100 ml;

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29728

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

108

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data collected by the County of Orange from January 1999 through December 2007. There were 982 single samples collected for enterococcus. From the 982 samples, 108 monthly geomeans were calculated with 19 exceeding the water contact recreation objective for enterococcus.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

Single Sample Maximum: Enterococcus density shall not exceed 104 per 100 ml;

Geomean: Enterococcus density shall not exceed 35 per 100 ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29725

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

108

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2007. The total number of samples collected was 906. From the 906 samples, 108 monthly geomeans were calculated with none exceeding the water contact recreation geomean water quality objective for fecal coliform.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Fecal coliform density shall not exceed 400 per 100 ml;

Geomean: Fecal coliform density shall not exceed 200 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29724

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

906

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through Decembery 2007. The number of samples collected was 906. From the 906 samples, 49 exceeded the water contact recreation single sample maximum water quality objective for fecal coliform.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Fecal coliform density shall not exceed 400 per 100 ml;

Geomean: Fecal coliform density shall not exceed 200 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

31083

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:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Fecal coliform density shall not exceed 200 per 100ml within any 30 day period (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29726

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:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline samples were collected by the County of Orange from January 1999 through December 2007. The number of samples collected was 906. Between March 2002 and December 2007, 50 samples were correlated with storm events. From the 50 storm event samples, 15 exceeded the water contact recreation single sample maximum water quality objective for fecal coliform. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Fecal coliform density shall not exceed 400 per 100 ml;

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29732

Pollutant:

Indicator Bacteria

LOE Subgroup:

Health Advisories

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

2555

Number of Exceedances:

144

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

For the period from January 2000 to December 2006, there were 144 beach postings days for this section of shoreline. Bacteriological samples are collected on a weekly basis at approximately 150 ocean and bay location in Orange County. When a bacteriological sample exceeds water quality standards, signs are posted indicating that waters have exceeded public health standards.

Data and information on the number of beach posting were summarized by the County of Orange in their Annual Ocean and Bay Water Quality Report, March 2007. The reporting period was from January 2000 -December 2006. Data used was the number of days the beach was posting when the ocean or bay failed to meet the bacteriological standards.

Data Reference:

County of Orange. March 2007. Annual Ocean and Bay Water Quality Report, 2006

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Code of Regulations. Title 17, Section 7960.

(a) When a public beach or public water-contact sports area fails to meet any of the standards as set forth in Section 7957 or 7958 above, the local health officer or the Department, after taking into consideration the causes therefor, may at his or its discretion close, post with warning signs, or otherwise restrict use of said public beach or public water-contact sports area, until such time as corrective action has been taken and the standards as set forth in 7957 and 7958 above are met.

Objective/Criterion Reference:

California Code of Regulations, Title 17, Section 7960

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Bacteriological monitoring samples were collected at Aliso Beach and South Laguna Beach in Orange County, California. Beaches included Goff Island Beach, Treasure Island Beach, Aliso North, Aliso Middle, Aliso South, Camel Point, Table Rock, Laguna Lido, 9th Street/1000 Steps, and Three Arch Bay. The posting covers two miles of beach shoreline.

Temporal Representation:

The beach posting covers the time frame of January 2000 -December 2006.

Environmental Conditions:

QAPP Information:

Samples were collected in compliance with County of Orange's Quality Assessment/Quality Control document (County of Orange, 2004).

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

30293

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.

For the 2008 assessment , the 2006 listed coastline 'Pacific Ocean Shoreline, Aliso HSA' was split into smaller segments and each represents an area near the sampling location of the data being assessed. This segment 'Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach middle' is one of the sampling locations. This LOE is a copy of the 2006 listing placeholder LOE for Pacific Ocean Shoreline, Aliso HSA and is considered by the Regional Board to be applicable to this more specific segment formed from the split.

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76063, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Beach - middle

LOE ID:

29719

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

994

Number of Exceedances:

201

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through December 2007. The number of samples collected was 994. From the 994 samples, 201 exceeded the single sample maximum shellfish water quality objective.

Data Reference:

Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report

National Weather Service Forecast Office, San Diego, California, Chronological Regional Temperature and Precipitation Listings by Station

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan, the median total coliform density shall not exceed 70 per 100 ml, and not more than 10 percent of the samples shall exceed 230 per 100 ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the sampling station Aliso Beach Middle, station code S9, in the Aliso Beach HSA. Lat/Long: 33.50962/-117.75237.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2007; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion of this study was conducted in accordance with the County of Orange Quality Assessment/Quality Control document.

QAPP Information Reference(s):

County of Orange. Quality Assurance/Quality Control Manual, February 2004 Bacteria specific