Final California 2026 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach
Water Body ID:	CAC9011200020090505110718
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	145379	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

Pollutant:	Indicator Bacteria
Final Listing Decision:	Delist from 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2020)
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; due to change in WQS
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:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.3 of the Listing Policy. Under section 3.3 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant for REC-1. Zero of the 413 samples exceed the GM threshold for Enterococci. Zero of 273 samples exceed the GM threshold for Fecal Coliform. Eight lines of evidence are available in the administrative record to assess this pollutant for SHELL. Sixty-six of 679 samples exceed the 10% threshold, and 13 of 679 exceed the median threshold. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA and is expected to result in attainment of the standard. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for this water segment-pollutant combination to remain delisted 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. Zero of the 413 samples exceed the GM threshold for Enterococci, zero of 273 samples exceed the GM threshold for Fecal Coliform for the protection of REC-1, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. The TMDL was approved by USEPA on 6/22/2011. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. The Water Quality Control Plan for Ocean Waters (“Ocean Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use: a fecal coliform water quality objective and an enterococci water quality objective. This waterbody is being considered for placement on or removal from the CWA section 303(d) List under section 3.3 or 4.3 of the Listing Policy, as applicable, using the fecal coliform and enterococci objectives. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. For enterococci data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches from April 1 through October 31 only.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	The Water Quality Control Plan for Ocean Waters (“Ocean Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use: a fecal coliform water quality objective and an enterococci water quality objective. This waterbody is being considered for placement on or removal from the CWA section 303(d) List under section 3.3 or 4.3 of the Listing Policy, as applicable, using the fecal coliform and enterococci objectives. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. For enterococci data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches from April 1 through October 31 only.

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

Listing Extent:

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

220043

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

431

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 431 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29304

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples 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

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 Lagunita Place, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

220096

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

431

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 431 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29303

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

911

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with two exceeding the single sample maximum for total coliform.

Data Reference:

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

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74948

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

149

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

One of the 149 samples exceeded the total coliform objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The 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 total coliform concentration shall not exceed more than 10000/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site DUMOND, Coastal Stormdrain at Dumond Drive (surzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to April 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74949

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

138

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

None of the 138 samples exceeded the total coliform objective. For these stations, 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 geometric mean for total coliform shall not exceed more than 1000/100ml. Water Quality Control Plan for the San Diego Basin. Water Quality Control Plan for Ocean Waters.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Coastal Stormdrain at Dumond Drive (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74950

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

122

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 122 geomeans exceeded the objective.

Data Reference:

Data for Region 9 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 at the Victoria Beach site.

Temporal Representation:

Samples were collected from January 2008 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

220056

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

215

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 215 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the 30 day geometric mean of fecal coliform density not exceed 200 per 100 mL, calculated based on the five most recent samples from each site.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

219941

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 6 of the 57 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the bacteria water quality objective to protect the REC-1 beneficial for all ocean waters for Enterococci is a statistical value threshold (STV) of 110 cfu/100 mL. The STV shall not be exceeded by more than 10 percent of the samples collected in a calendar month, calculated in a static manner.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

219781

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

217

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 217 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the bacteria water quality objective to protect the REC-1 beneficial for all ocean waters for Enterococci is a geometric mean (GM) of 30 cfu/100 mL. The waterbody GM shall not be greater that the GM magnitude in any six-week interval, calculated weekly.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234297

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 4 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDU

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234293

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

212

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 5 of the 212 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234240

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 6 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234277

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 4 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234388

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 2 of the 51 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234461

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 12 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDU

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234182

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

196

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 196 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234467

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 12 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234423

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

212

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 1 of the 212 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234394

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDU

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234186

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 58 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the 30 day geometric mean of fecal coliform density not exceed 200 per 100 mL, calculated based on the five most recent samples from each site.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234415

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234215

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 5 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDU

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234236

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

212

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 20 of the 212 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.



DECISION ID	145379	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

Pollutant:	Indicator Bacteria
Final Listing Decision:	Delist from 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2020)
Revision Status	Revised
Reason for Delisting:	Applicable WQS attained; due to change in WQS
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:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.3 of the Listing Policy. Under section 3.3 a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant for REC-1. Zero of the 413 samples exceed the GM threshold for Enterococci. Zero of 273 samples exceed the GM threshold for Fecal Coliform. Eight lines of evidence are available in the administrative record to assess this pollutant for SHELL. Sixty-six of 679 samples exceed the 10% threshold, and 13 of 679 exceed the median threshold. There is sufficient justification to place it in the Being Addressed portion of the CWA 303(d) List because a TMDL has been completed and approved by RWQCB and USEPA and is expected to result in attainment of the standard. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for this water segment-pollutant combination to remain delisted 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. Zero of the 413 samples exceed the GM threshold for Enterococci, zero of 273 samples exceed the GM threshold for Fecal Coliform for the protection of REC-1, and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. The TMDL was approved by USEPA on 6/22/2011. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. The Water Quality Control Plan for Ocean Waters (“Ocean Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use: a fecal coliform water quality objective and an enterococci water quality objective. This waterbody is being considered for placement on or removal from the CWA section 303(d) List under section 3.3 or 4.3 of the Listing Policy, as applicable, using the fecal coliform and enterococci objectives. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, fecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy. For enterococci data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches from April 1 through October 31 only.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	The Water Quality Control Plan for Ocean Waters (“Ocean Plan”) contains two bacteria water quality objectives applicable to the REC-1 beneficial use: a fecal coliform water quality objective and an enterococci water quality objective. This waterbody is being considered for placement on or removal from the CWA section 303(d) List under section 3.3 or 4.3 of the Listing Policy, as applicable, using the fecal coliform and enterococci objectives. In accordance with section 6.1.5.3 of the Listing Policy, data should be representative of the critical timing that the pollutant is expected to impact the waterbody. Indicator bacteria (total coliform, 3px; WIDTH: 100%; text-align: left; PADDING-TOP: 3px; font-smooth: always">Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29288

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 51 samples correlated with storm events. Of the 51 samples, 11 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: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

Temporal Representation:

Samples were collected weekly from January 1999 through December 2006; however, rainfall data is only available from March 2002 through December 2006.

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. The 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

31102

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samplfecal coliform, E. coli, enterococci) populations may fluctuate substantially on a daily, seasonal, or yearly basis. Lacking constant inputs, they do not persist in the environment for a long period and effects are of relatively short duration. As a result, the historic levels of indicator bacteria in the waterbody may be a poor indicator of current risks to human health, particularly when more recent data are available to sufficiently assess the water quality standard. Additionally, water quality conditions in waterbodies may change as a result of management actions that have been implemented to address bacteria. Unrepresentative data may result in incorrectly placing or not placing a water body segment on the list, which could result in the unnecessary expenditure of public resources or missing a human health problem. Historic lines of evidence for data collected prior to 2010 were evaluated pursuant to these considerations and were not used to assess water quality standards attainment because they do not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy.

For enterococci data, Listing Policy sections 3.3 and 4.3 instructs to use the binomial distribution table in sections 3.2 and 4.2, as applicable. To use the binomial table that uses a four percent exceedance frequency, the data must be collected from coastal beaches from April 1 through October 31 only.

State Board Decision Recommendation:

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

Listing Extent:

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

220043

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

431

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria

Region 9

Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

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 zero exceeded the geomean water quality objective.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74928

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

122

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 122 geomeans exceeded the objective.

Data Reference:

Data for Region 9 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 at the Victoria Beach site.

Temporal Representation:

Samples were collected from January 2008 to August 2010.

Environmental Conditions:

QAPP Information:

The samples were collected for the Beach Watch program.

LOE ID:

29304

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:

Data Reference:

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

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 Lagunita Place, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

220096

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

431

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 431 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29303

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

911

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with two exceeding the single sample maximum for total coliform.

Data Reference:

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

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29284

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 108 monthly geomeans calculated. Of the 108 geomeans, only 2 exceeded the geomean water quality objective.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74927

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

138

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

None of the 138 geomeans exceeded the enterococcus objective. For this station, 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 geometric mean for enterococcus shall not exceed 35 MPN/100 mL. Water Quality Control Plan for the San Diego Basin. California Ocean Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Coastal Stormdrain at Dumond Drive (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74926

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

149

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

One of the 149 samples exceeded the enterococcus objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The 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 enterococcus concentration shall not exceed more than 104/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site DUMOND, Coastal Stormdrain at Dumond Drive (surzone upcoast and surzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to April 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 of948

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

149

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

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 total coliform concentration shall not exceed more than 10000/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site DUMOND, Coastal Stormdrain at Dumond Drive (surzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to April 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74949

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

138

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The geometric mean for total coliform shall not exceed more than 1000/100ml. Water Quality Control Plan for the San Diego Basin. Water Quality Control Plan for Ocean Waters.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009< Evidence (LOE) for Decision ID 145379, Indicator Bacteria

Region 9

Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29282

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

911

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 46 samples exceeding the single sample maximum water quality objective.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29308

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 51 associated with storm events. Two of the 51 samples exceeded the fecal coliform 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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Coastal Stormdrain at Dumond Drive (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74950

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

122

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 122 geomeans exceeded the objective.

Data Reference:

Data for Region 9 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 at the Victoria Beach site.

Temporal Representation:

Samples were collected from January 2008 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

220056

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

215

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

31101

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

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 durign="left" valign="top" width="67%">Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 215 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the 30 day geometric mean of fecal coliform density not exceed 200 per 100 mL, calculated based on the five most recent samples from each site.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

219941

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 6 of the 57 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

219781

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

217

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 217 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234297

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as folling 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74931

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

122

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 122 geomeans exceeded the objective.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The 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 at the Victoria Beach site.

Temporal Representation:

Samples were collected from January 2008 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29307

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 108 monthly geomean calculated. None of the 108 goemeans exceeded the fecal coliform geomean water quality objective.

Data Reference:

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

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74929

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

149

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Zero of the 149 samples exceeded the fecal coliform objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The 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. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site DUMOND, Coastal Stormdrain at Dumond Drive (surzone upcoast and downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to April 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 145379, Indicator Bacteria

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDU

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234293

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

212

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 5 of the 212 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29306

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

911

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with four samples exceeding the fecal coliform single sample water quality objective.

Data Reference:

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

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74930

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

138

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

None of the 138 geomeans exceeded the fecal coliform objective. For this station, 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.

Region 9

Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234240

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 6 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234277

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:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 4 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold for shellfish is based on the median concentration of Total Coliform at each station, and is calculated as a 30-day rolling median.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that the median total coliform density shall not exceed 70 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234388

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 2 of the 51 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The geometric mean for fecal coliform shall not exceed more than 200/100ml. Water Quality Control Plan for the San Diego Basin. California Ocean Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Coastal Stormdrain at Dumond Drive (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29324

Pollutant:

Indicator Bacteria

LOE Subgroup:

Health Advisories

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

2555

Number of Exceedances:

204

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 and 204 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 Emerald Bay, Crescent Bay, Laguna Main Beach, Hotel Laguna, Bluebird Canyon, Victoria Beach and Blue Lagoon. The posting covers 4.4 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

30304

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, Laguna Beach 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, Laguna Beach HSA, at Lagunita Place' is one of the sampling locations. This LOE is a copy of the 2006 listing placeholder LOE for Pacific Ocean Shoreline, Laguna Beach 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

77625

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

122

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Zero of the 122 samples exceeded the objective of 70 mpn/100ml applied as a rolling 30 day geomean.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, the median total coliform density shall not exceed 70 per 100 mL. Staff applied the objective as a rolling 30 day geometric mean consistent with other state bacteria objectives and with guidance from the National Shellfish Sanitation Program from which the objectives were taken.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach.

Temporal Representation:

The samples were collected from January 2008 through 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29270

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples. Of the 911 samples, 51 were associated with a storm event. Fifteen of the 51 samples exceeded the shellfish single sample maximum water quality objective for total 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:

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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):

C-WEIGHT: bold; PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 9

Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234461

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 12 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDU

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234182

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

196

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 196 samples exceeded the geomean water quality threshold for Enterococcus. This is a six week rolling geomean that is calculated weekly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

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

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29281

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

911

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples collected with 44 exceeding the shellfish single sample maximum water quality objective for total coliform.

Data Reference:

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

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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

74947

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

143

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Beach Watch data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and results are as fNon-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDZ

Temporal Representation:

The samples were collected between the days of 2015-04-06 and 2019-06-10 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

234467

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 data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 12 samples exceeded the Statistical Threshold Value (STV) water quality threshold for Enterococcus. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): DUMONDD

Temporal Representation:

The samples were collected between the days of 2015-12-14 and 2019-03-18 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, not more than 10 percent of the samples shall exceed 230 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 Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach was collected at 1 monitoring site [ Victoria Beach]

Temporal Representation:

Data was collected over the time period 1/3/2008-8/30/2010.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

29305

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:

Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 51 samples correlated with a storm event. Two of the 51 samples exceeded the total coliform 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

31100

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:

Data Reference:

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

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 Lagunita Place, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302.

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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID:

219951

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

431

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 35 of the 431 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid.

Data Reference:

Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL.

Objective/Criterion Reference:

SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): S14

Temporal Representation:

The samples were collected between the days of 2010-08-31 and 2015-04-01 .

Environmental Conditions:

QAPP Information:

QAPP for the Orange County Beachwatch data

QAPP Information Reference(s):

QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

PADDING-BOTTOM: 3px; WIDTH: 100%; text-align: right; PADDING-TOP: 3px; font-smooth: always">Region 9

Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 234423 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 212 Number of Exceedances: 1 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 1 of the 212 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): DUMONDZ Temporal Representation: The samples were collected between the days of 2015-04-06 and 2019-06-10 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 234394 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 18 Number of Exceedances: 0 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): DUMONDU Temporal Representation: The samples were collected between the days of 2015-12-14 and 2019-03-18 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 234186 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 58 Number of Exceedances: 0 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 58 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a 30-Day rolling geomean. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that the 30 day geometric mean of fecal coliform density not exceed 200 per 100 mL, calculated based on the five most recent samples from each site. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): DUMONDZ Temporal Representation: The samples were collected between the days of 2015-04-06 and 2019-06-10 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 234415 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 18 Number of Exceedances: 0 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 0 of the 18 samples exceeded the water quality threshold for Coliform, Fecal. The water quality threshold is based on a Single Sample Maximum (SSM) value that is calculated daily. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that the Single Sample Maximum fecal coliform density not exceed 400 per 100 mL. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): DUMONDD Temporal Representation: The samples were collected between the days of 2015-12-14 and 2019-03-18 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 234215 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 18 Number of Exceedances: 5 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 5 of the 18 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): DUMONDU Temporal Representation: The samples were collected between the days of 2015-12-14 and 2019-03-18 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 234236 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 212 Number of Exceedances: 20 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 20 of the 212 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): DUMONDZ Temporal Representation: The samples were collected between the days of 2015-04-06 and 2019-06-10 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.

Line of Evidence (LOE) for Decision ID 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29288 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 51 Number of Exceedances: 11 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 51 samples correlated with storm events. Of the 51 samples, 11 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: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. Temporal Representation: Samples were collected weekly from January 1999 through December 2006; however, rainfall data is only available from March 2002 through December 2006. 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. The 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 31102 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 56 Number of Exceedances: 0 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 zero exceeded the geomean water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74928 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 122 Number of Exceedances: 0 Data and Information Type: Not Specified Data Used to Assess Water Quality: Zero of the 122 geomeans exceeded the objective. Data Reference: Data for Region 9 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 at the Victoria Beach site. Temporal Representation: Samples were collected from January 2008 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29284 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 108 Number of Exceedances: 2 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 108 monthly geomeans calculated. Of the 108 geomeans, only 2 exceeded the geomean water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74927 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 138 Number of Exceedances: 0 Data and Information Type: Not Specified Data Used to Assess Water Quality: None of the 138 geomeans exceeded the enterococcus objective. For this station, 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 geometric mean for enterococcus shall not exceed 35 MPN/100 mL. Water Quality Control Plan for the San Diego Basin. California Ocean Plan. Objective/Criterion Reference: Water Quality Control Plan for the San Diego Basin Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected from Coastal Stormdrain at Dumond Drive (surfzone upcoast and surfzone downcoast). Temporal Representation: The samples were collected once a week from July 2006 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74926 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 149 Number of Exceedances: 1 Data and Information Type: Not Specified Data Used to Assess Water Quality: One of the 149 samples exceeded the enterococcus objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The 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 enterococcus concentration shall not exceed more than 104/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan. Objective/Criterion Reference: Water Quality Control Plan for the San Diego Basin Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected from site DUMOND, Coastal Stormdrain at Dumond Drive (surzone upcoast and surzone downcoast). Temporal Representation: The samples were collected once a week from July 2006 to April 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29282 Pollutant: Enterococcus LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 911 Number of Exceedances: 46 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 46 samples exceeding the single sample maximum water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29308 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 51 Number of Exceedances: 2 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 51 associated with storm events. Two of the 51 samples exceeded the fecal coliform 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: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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. The 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 31101 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 56 Number of Exceedances: 0 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 zero exceeded the geomean water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74931 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 122 Number of Exceedances: 0 Data and Information Type: Not Specified Data Used to Assess Water Quality: Zero of the 122 geomeans exceeded the objective. Data Reference: Data for Region 9 Beach Watch. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The 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 at the Victoria Beach site. Temporal Representation: Samples were collected from January 2008 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29307 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 108 Number of Exceedances: 0 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 108 monthly geomean calculated. None of the 108 goemeans exceeded the fecal coliform geomean water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74929 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 149 Number of Exceedances: 0 Data and Information Type: Not Specified Data Used to Assess Water Quality: Zero of the 149 samples exceeded the fecal coliform objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The 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. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan. Objective/Criterion Reference: Water Quality Control Plan for the San Diego Basin Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected from site DUMOND, Coastal Stormdrain at Dumond Drive (surzone upcoast and downcoast). Temporal Representation: The samples were collected once a week from July 2006 to April 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29306 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 911 Number of Exceedances: 4 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with four samples exceeding the fecal coliform single sample water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74930 Pollutant: Fecal Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 138 Number of Exceedances: 0 Data and Information Type: Not Specified Data Used to Assess Water Quality: None of the 138 geomeans exceeded the fecal coliform objective. For this station, 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 geometric mean for fecal coliform shall not exceed more than 200/100ml. Water Quality Control Plan for the San Diego Basin. California Ocean Plan. Objective/Criterion Reference: Water Quality Control Plan for the San Diego Basin Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected from Coastal Stormdrain at Dumond Drive (surfzone upcoast and surfzone downcoast). Temporal Representation: The samples were collected once a week from July 2006 to 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29324 Pollutant: Indicator Bacteria LOE Subgroup: Health Advisories Matrix: -N/A Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 2555 Number of Exceedances: 204 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 and 204 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 Emerald Bay, Crescent Bay, Laguna Main Beach, Hotel Laguna, Bluebird Canyon, Victoria Beach and Blue Lagoon. The posting covers 4.4 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 30304 Pollutant: Indicator Bacteria LOE Subgroup: Pollutant-Water Matrix: Water Fraction: Not Recorded Beneficial Use: Water Contact Recreation Number of Samples: 0 Number of Exceedances: 0 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, Laguna Beach 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, Laguna Beach HSA, at Lagunita Place' is one of the sampling locations. This LOE is a copy of the 2006 listing placeholder LOE for Pacific Ocean Shoreline, Laguna Beach 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 77625 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 122 Number of Exceedances: 0 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Zero of the 122 samples exceeded the objective of 70 mpn/100ml applied as a rolling 30 day geomean. Data Reference: Data for Region 9 Beach Watch. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, the median total coliform density shall not exceed 70 per 100 mL. Staff applied the objective as a rolling 30 day geometric mean consistent with other state bacteria objectives and with guidance from the National Shellfish Sanitation Program from which the objectives were taken. Objective/Criterion Reference: California Ocean Plan Water Quality Control Plan Ocean Waters of California 2009 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach. Temporal Representation: The samples were collected from January 2008 through 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29270 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 51 Number of Exceedances: 15 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples. Of the 911 samples, 51 were associated with a storm event. Fifteen of the 51 samples exceeded the shellfish single sample maximum water quality objective for total 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: 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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. The 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29281 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 911 Number of Exceedances: 44 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples collected with 44 exceeding the shellfish single sample maximum water quality objective for total coliform. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 74947 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 143 Number of Exceedances: 1 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed Beach Watch data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and results are as follows: 1 of 143 samples exceed the criterion for Coliform, Total. Data Reference: Data for Region 9 Beach Watch. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: The California Ocean Plan states that at all areas where shellfish may be harvested for human consumption, not more than 10 percent of the samples shall exceed 230 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 Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach was collected at 1 monitoring site [ Victoria Beach] Temporal Representation: Data was collected over the time period 1/3/2008-8/30/2010. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 29305 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 51 Number of Exceedances: 2 Data and Information Type: PWS pathogen monitoring (ambient water) Data Used to Assess Water Quality: Beach monitoring data was collected by the County of Orange from January 1999 through December 2007. There were 911 individual samples with 51 samples correlated with a storm event. Two of the 51 samples exceeded the total coliform 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 Dumond Dr, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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. The 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 31100 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Water Contact Recreation Number of Samples: 56 Number of Exceedances: 1 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 one exceeded the geomean water quality objective. Data Reference: Ocean Bacteriological Data Evaluation for City of Laguna Beach, 1999 through 2006, Final Report 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 Lagunita Place, station id S14, in the Laguna HSA. Lat/Long: 33.51919/-117.76302. 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 145379, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach

LOE ID: 219951 Pollutant: Total Coliform LOE Subgroup: Pollutant-Water Matrix: Water Fraction: None Beneficial Use: Shellfish Harvesting Number of Samples: 431 Number of Exceedances: 35 Data and Information Type: PATHOGEN MONITORING Data Used to Assess Water Quality: Water Board staff assessed data for Pacific Ocean Shoreline, Laguna Beach HSA, at Dumond Drive at Victoria Beach to determine beneficial use support and the results are as follows: 35 of the 431 samples exceeded the water quality threshold for Coliform, Total. The water quality threshold is based on a 10% exceedance rate that is calculated for a 30-Day peroid. Data Reference: Coastal Counties in Region 9 including: Orange, San Diego, and Los Angeles counties. SWAMP Data: Non-SWAMP Water Quality Objective/Criterion: California Ocean Plan (SWRCB 2019) states that not more than 10 percent of the total coliform samples shall exceed 230 per 100 mL. Objective/Criterion Reference: SWRCB. 2005. Water Quality Control Plan, Ocean Waters of California (Ocean Plan). California Environmental Protection Agency, State Water Resources Control Board. February 2, 2019 Evaluation Guideline: Guideline Reference: Spatial Representation: The samples were collected at 1 monitoring site(s), station(s): S14 Temporal Representation: The samples were collected between the days of 2010-08-31 and 2015-04-01 . Environmental Conditions: QAPP Information: QAPP for the Orange County Beachwatch data QAPP Information Reference(s): QAPP for the Orange County Beachwatch data for the 2020 Integrated Report.