Draft 2008 California 303(d)/305(b) Integrated Report

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	Pacific Ocean Shoreline, Rancho Santa Fe HSA, at Powerhouse Park
Water Body ID:	CAC9051100020090216230114
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	16375

Pollutant:	Enterococcus
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the 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. Five of the samples exceed the water quality objective for enterococcus . Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. 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. Five of 169 samples exceeded the enterococcus water quality objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 16375


LOE ID:	27109

Pollutant:	Enterococcus
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	40
Number of Exceedances:	1

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 2004 through December 2007. A total of 169 single samples were collected with 40 monthly geomeans calculated. One of the 40 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.


LOE ID:	28208

Pollutant:	Indicator Bacteria
LOE Subgroup:	Health Advisories
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	2555
Number of Exceedances:	2

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 two beach advisory days for this location. Bacteriological samples are collected on a weekly basis from April through October. 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:	County of Orange. March 2007. Annual Ocean and Bay Water Quality Report, 2006.
	Department of Environmental Health, Land and Water Quality Division. San Diego County Beach Closure and Advisory Report.

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 the shoreline near Powerhouse Park in Del Mar, CA.
Temporal Representation:	The beach advisory 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.


LOE ID:	27106

Pollutant:	Enterococcus
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	5
Number of Exceedances:	1

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 2004 through December 2007. A total of 169 single samples were collected with five samples correlated with a storm event. One of the five samples exceeded 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.


LOE ID:	27105

Pollutant:	Enterococcus
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	169
Number of Exceedances:	5

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 2004 through December 2007. A total of 169 single samples were collected with 5 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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 Orange. Quality Assurance/Quality Control Manual, February 2004.
	County of San Diego, 2006. Department Public Health Laboratory, Quality Assurance Manual, December 2006.


DECISION ID	16373

Pollutant:	Fecal Coliform
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the 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. Two of the samples exceed the water quality objective for fecal coliform. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two of 107 samples exceed the fecal coliform water quality objective and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 16373


LOE ID:	27104

Pollutant:	Fecal Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	3
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 San Diego from January 2004 through December 2007. A total of 107 single samples were collected with three samples correlated with a storm event. No sample exceeded 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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 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.


LOE ID:	27103

Pollutant:	Fecal Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	107
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 San Diego from January 2004 through December 2007. A total of 107 single samples were collected with two 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.


LOE ID:	27108

Pollutant:	Fecal Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	26
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 San Diego from January 2004 through December 2007. A total of 107 single samples were collected and 26 geomeans calculated. None of the 26 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.


LOE ID:	28208

Pollutant:	Indicator Bacteria
LOE Subgroup:	Health Advisories
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	2555
Number of Exceedances:	2

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 two beach advisory days for this location. Bacteriological samples are collected on a weekly basis from April through October. 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:	County of Orange. March 2007. Annual Ocean and Bay Water Quality Report, 2006.
	Department of Environmental Health, Land and Water Quality Division. San Diego County Beach Closure and Advisory Report.

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 the shoreline near Powerhouse Park in Del Mar, CA.
Temporal Representation:	The beach advisory 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.


DECISION ID	16372

Pollutant:	Total Coliform
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the 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. Six lines of evidence are available in the administrative record to assess this pollutant. Eleven of the samples exceed the water quality objectives for Shellfish Harvesting. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. 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. Eleven of 169 samples exceeded the Shellfish Harvesting water quality objectives and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 16372


LOE ID:	27098

Pollutant:	Total Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Shellfish Harvesting

Number of Samples:	169
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 San Diego from January 2004 through December 2007. A total of 169 single samples were collected with 11 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.

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 15th St. Del Mar, Del Mar City Beach, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.


LOE ID:	27099

Pollutant:	Total Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Shellfish Harvesting

Number of Samples:	5
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 San Diego from January 2004 through December 2007. A total of 169 single samples were collected with five samples correlated with a storm event. Two of the five samples exceeded 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.

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). Comparisons are also made 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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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 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.


LOE ID:	28208

Pollutant:	Indicator Bacteria
LOE Subgroup:	Health Advisories
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	2555
Number of Exceedances:	2

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 two beach advisory days for this location. Bacteriological samples are collected on a weekly basis from April through October. 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:	County of Orange. March 2007. Annual Ocean and Bay Water Quality Report, 2006.
	Department of Environmental Health, Land and Water Quality Division. San Diego County Beach Closure and Advisory Report.

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 the shoreline near Powerhouse Park in Del Mar, CA.
Temporal Representation:	The beach advisory 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.


LOE ID:	27102

Pollutant:	Total Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	5
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 San Diego from January 2004 through December 2007. A total of 169 single samples were collected with five samples correlated with a storm event. None of the five samples exceeded 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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 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.


LOE ID:	27107

Pollutant:	Total Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	40
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 San Diego from January 2004 through December 2007. A total of 169 single samples were collected with 40 monthly geomeans calculated. None of the 40 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.


LOE ID:	27100

Pollutant:	Total Coliform
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	None

Beneficial Use:	Water Contact Recreation

Number of Samples:	169
Number of Exceedances:	1

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 2004 through December 2007. A total of 169 single samples were collected with one sample 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.

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 at 15th St. Del Mar City Beach, Del Mar, California. Station identification number is EH-360.
Temporal Representation:	Samples were collected from January 2004 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.