Final California 2018 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	Mission Bay Shoreline, at Bahia Point
Water Body ID:	CAC9075100020090422203910
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	76066	Region 9
Mission Bay Shoreline, at Bahia Point

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Eleven lines of evidence are available in the administrative record to assess this pollutant. With the latest data, 21 of 121 geomean samples collected in AB411 period exceed the water quality objective (WQO) of 35/100ml in a 30-day period, and 63 of 456 samples collected in AB411 period exceed the SSM WQO for enterococcus of 104/100ml. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. With the latest data, 21 of 121 geomean samples collected in AB411 period exceed the water quality objective (WQO) of 35/100ml in a 30-day period, and 63 of 456 samples collected in AB411 period exceed the SSM WQO for enterococcus of 104/100ml and this exceeds the allowable frequency of AB411 period listed in Section 4.3 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

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

State Board Review of Regional Board Conclusion and Recommendation:

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

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

81125

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed bw data for Mission Bay Shoreline, at Bahia Point to determine beneficial use support and results are as follows: 0 of 63 samples (AB 411 period) exceed the criterion for Coliform, Total.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Total coliform density shall not exceed 1000 per 100ml in any 30-day period (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Mission Bay Shoreline, at Bahia Point was collected at 1 monitoring site [ Bahia Point]

Temporal Representation:

Data was collected over the AB 411 time period 4/2/2008-8/24/2010.

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 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28669

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 San Diego from January 1999 through October 2007. A total of 399 single samples were collected with 79 monthly geomeans calculated. Sixteen of the 79 geomeans exceeded the geomean water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Enterococcus density shall not exceed 35 per 100 ml.

Single Sample Maximum: Enterococcus density shall not exceed 104 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

30780

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

382

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 San Diego from January 1999 through October 2007. A total of 397 single samples were collected of which 382 are dry weather (AB411) samples with five samples exceeding the single sample water quality objective.

Data Reference:

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

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Total coliform density shall not exceed 10,000 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28746

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

397

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 San Diego from January 1999 through October 2007. A total of 397 single samples were collected with eight samples exceeding the single sample water quality objective.

Data Reference:

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

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Total coliform density shall not exceed 10,000 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28734

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 from January 1999 through October 2007. A total of 397 single samples were collected with 79 monthly geomeans calculated. One of the 79 geomeans exceeded the geomean water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Total coliform density shall not exceed 1,000 per 100ml;

Single Sample Maximum: Total coliform density shall not exceed 10,000 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28740

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 San Diego from January 1999 through October 2007. A total of 397 single samples were collected with 15 samples correlated with a storm event. Three of the 15 samples 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:

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

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Total coliform density shall not exceed 1,000 per 100ml;

Single Sample Maximum: Total coliform density shall not exceed 10,000 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 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 was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

74328

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 bw data for Mission Bay Shoreline, at Bahia Point to determine beneficial use support and results are as follows: 2 of 72 samples exceed the criterion for Coliform, Total.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The Water Quality Control Plan (Basin Plan 2011)states the following: At all areas where shellfish may be harvested for human consumption, ten percent of the samples collected during any 30-day period shall not exceed 230 MPN/100mL.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Mission Bay Shoreline, at Bahia Point was collected at 1 monitoring site [ Bahia Point]

Temporal Representation:

Data was collected over the time period 4/2/2008-8/24/2010.

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 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28644

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Shellfish Harvesting

Number of Samples:

397

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 San Diego from January 1999 through October 2007. A total of 397 single samples were collected with 75 samples exceeded the single sample water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the median coliform density shall not exceed 70 per 100ml, and not more than 10 percent of the samples shall exceed 230 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 at Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28646

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 San Diego from January 1999 through October 2007. A total of 397 single samples were collected with 15 samples correlated with a storm event. Nine of the 15 samples 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:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

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 coliform density shall not exceed 70 per 100ml, and not more than 10 percent of the samples shall exceed 230 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

30338

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

2933

Number of Exceedances:

959

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Below is a copy of the 2006 LOE for the data supporting the listing of Mission Bay Shoreline:

Available data indicate sufficient exceedances of bacterial indicator objectives. There were 576 out of 3662 samples exceeding the single sample maximum for enterococci, 959 out of 2933 exceedances of the geomean enterococci, and 333 out samples exceeding the single sample maximum for fecal coliform (USEPA, 2007).

Data Reference:

Placeholder reference 2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Title 17 C.C.R. Section 7958 states: Based on a single sample, the density of bacteria in water from each sampling station at a public beach or public water contact sports area shall not exceed:
(A) 1,000 total coliform bacteria per 100 milliliters, if the ratio of fecal/total coliform bacteria exceeds 0.1; or
(B) 10,000 total coliform bacteria per 100 milliliters; or
(C) 400 fecal coliform bacteria per 100 milliliters; or
(D) 104 enterococcus bacteria per 100 milliliters.

Based on the mean of the logarithms of the results of at least five weekly samples during any 30-day sampling period, the density of bacteria in water from any sampling station at a public beach or public water contact sports area, shall not exceed:
(A) 1,000 total coliform bacteria per 100 milliliters; or
(B) 200 fecal coliform bacteria per 100 milliliters; or
(C) 35 enterococcus bacteria per 100 milliliters (DHS, 1999).

Objective/Criterion Reference:

Placeholder reference 2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

In 2006, data from sampling sites along the Mission Bay shoreline were aggregated for the assessment. For 2008, the 2006 Mission Bay Shoreline segment has been split into smaller segments and each represents an area near the sampling location of the data being assessed. 'Mission Bay Shoreline, at Bahia Point ' is one of the sampling locations for Mission Bay Shoreline and is considered to be part of the original listing

Temporal Representation:

From 03/21/2000-10/30/2005.

Environmental Conditions:

QAPP Information:

Data record: 2000-2005, San Diego County Health Dept.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

30107

Pollutant:

Indicator Bacteria

LOE Subgroup:

Health Advisories

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

2555

Number of Exceedances:

128

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

For the period from January 2001 to December 2007, there were 128 beach advisory days for this location. 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 San Diego in their annual San Diego County Beach Closure and Advisory Reports. The reporting period was from January 2001 to December 2007. Data used was the number of days the beach was posted with an Advisory when the ocean or bay failed to meet the bacteriological standards.

Data Reference:

Department of Environmental Health, Land and Water Quality Division. San Diego County Beach Closure and Advisory Report

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:

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

Spatial Representation:

Bacteriological monitoring samples were collected at Bahia Point in Mission Bay.

Temporal Representation:

The beach posting covers the time frame of January 2001 -December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

31335

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 San Diego from April 1999 through October 2007. A total of 268 dry month (April through October) single samples were collected with 49 dry month geomeans calculated. Four of the 49 geomeans exceeded the geomean water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean; Fecal coliform density shall not exceed 200 per 100 ml;

Single Sample Maximum; Fecal coliform density shall not exceed 400 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from April 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

81128

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:

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Mission Bay Shoreline, at Bahia Point was collected at 1 monitoring site [ Bahia Point]

Temporal Representation:

Data was collected over the AB 411 time period 4/2/2008-8/24/2010.

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 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

81129

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 bw data for Mission Bay Shoreline, at Bahia Point to determine beneficial use support and results are as follows: 0 of 72 samples (AB 411 period) exceed the criterion for Coliform, Fecal.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: fecal coliform density shall not exceed 400 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Mission Bay Shoreline, at Bahia Point was collected at 1 monitoring site [ Bahia Point]

Temporal Representation:

Data was collected over the AB 411 time period 4/2/2008-8/24/2010.

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 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

30528

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

344

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 San Diego from January 1999 through October 2007. A total of 344 dry weather single samples were collected with 37 samples exceeding the single sample water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean; Fecal coliform density shall not exceed 200 per 100 ml;

Single Sample Maximum; Fecal coliform density shall not exceed 400 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28687

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 San Diego from January 1999 through December 2007. A total of 358 single samples were collected with 14 samples correlated with a storm event. Six of the 14 samples 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:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean; Fecal coliform density shall not exceed 200 per 100 ml;

Single Sample Maximum; Fecal coliform density shall not exceed 400 per 100 ml (SWRCB, 2005).

Comparisons are also made only for days with matching bacteria and storm event data. A storm event was defined as 0.2 inches of rainfall within a 72 hour period.

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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through December 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28686

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 San Diego from January 1999 through October 2007. A total of 358 single samples were collected and 70 geomeans calculated. Four of the 70 geomeans exceeded the geomean water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean; Fecal coliform density shall not exceed 200 per 100 ml;

Single Sample Maximum; Fecal coliform density shall not exceed 400 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28682

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

358

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 San Diego from January 1999 through October 2007. A total of 358 single samples were collected with 43 samples exceeding the single sample water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean; Fecal coliform density shall not exceed 200 per 100 ml;

Single Sample Maximum; Fecal coliform density shall not exceed 400 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

31334

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 San Diego from April 1999 through October 2007. A total of 309 dry month (April through October) single samples were collected with 58 dry month geomeans calculated. Eleven of the 58 geomeans exceeded the geomean water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Enterococcus density shall not exceed 35 per 100 ml.

Single Sample Maximum: Enterococcus density shall not exceed 104 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from April 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

30543

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

384

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 San Diego from January 1999 through October 2007. A total of 399 single samples were collected of which 384 are dry weather (AB411) samples and with 57 samples exceeded the single sample water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Enterococcus density shall not exceed 35 per 100 ml.

Single Sample Maximum: Enterococcus density shall not exceed 104 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

81126

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 bw data for Mission Bay Shoreline, at Bahia Point to determine beneficial use support and results are as follows: 10 of 63 samples (AB411 period) exceed the criterion for Enterococcus.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Enterococcus density shall not exceed 35 per 100ml in any 30-day period (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Mission Bay Shoreline, at Bahia Point was collected at 1 monitoring site [ Bahia Point]

Temporal Representation:

Data was collected over the AB411 time period 4/2/2008-8/24/2010.

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 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

81127

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 bw data for Mission Bay Shoreline, at Bahia Point to determine beneficial use support and results are as follows: 6 of 72 samples (AB 411 period) exceed the criterion for Enterococcus.

Data Reference:

Data for Region 9 Beach Watch.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Single Sample Maximum: Enterococcus density shall not exceed 104 per 100ml (SWRCB, 2005).

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data for this line of evidence for Mission Bay Shoreline, at Bahia Point was collected at 1 monitoring site [ Bahia Point]

Temporal Representation:

Data was collected over the time period 4/2/2008-8/24/2010.

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 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

31336

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 San Diego from April 1999 through October 2007. A total of 307 dry month (April through October) single samples were collected with 58 dry month geomeans calculated. None of the 58 geomeans exceeded the geomean water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Total coliform density shall not exceed 1,000 per 100ml;

Single Sample Maximum: Total coliform density shall not exceed 10,000 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from April 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28670

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 San Diego from January 1999 through December 2007. A total of 399 single samples were collected with 15 samples correlated with a storm event. Seven of the 15 samples 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:

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

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Enterococcus density shall not exceed 35 per 100 ml.

Single Sample Maximum: Enterococcus density shall not exceed 104 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006

Line of Evidence (LOE) for Decision ID 76066, Indicator Bacteria	Region 9
Mission Bay Shoreline, at Bahia Point

LOE ID:

28668

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

399

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 San Diego from January 1999 through October 2007. A total of 399 single samples were collected with 64 samples exceeding the single sample water quality objective.

Data Reference:

Department of Environmental Health, Ocean & Bay Recreational Water Quality Program, 2007. AB 411 monitoring data 1999 to 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geomean: Enterococcus density shall not exceed 35 per 100 ml.

Single Sample Maximum: Enterococcus density shall not exceed 104 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 Bahia Point, San Diego, California. Station identification number is MB-160.

Temporal Representation:

Samples were collected from January 1999 through October 2007.

Environmental Conditions:

QAPP Information:

Quality control for the bacteria analysis portion was conducted in accordance with the County of San Diego, Department Public Health Laboratory Quality Assurance Manual.

QAPP Information Reference(s):

County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006