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

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	San Luis Rey River, Lower (west of Interstate 15)
Water Body ID:	CAR9031100020011005104327
Water Body Type:	River & Stream


DECISION ID	17908

Pollutant:	Benthic Community Effects
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:	Pollution

Weight of Evidence:	Benthic Community Effects is being considered for placement on the section 303(d) list under sections 3.9 and 3.2 of the Listing Policy. Under section 3.9, an additional line of evidence associating the Benthic Community Effects with a water or sediment concentration of pollutants is necessary to assess listing status. One line of evidence are available in the administrative record to assess this indicator. Twenty-four of 24 samples exceeded the water quality objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this water segment 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. Twenty-four of 24 samples exceeded the Index of Biological Integrity (IBI) value of "poor" water quality for this area and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy, however as required under section 3.9 of the Listing Policy, pollutant(s) could not be directly associated with the Benthic Community Effects. 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 it cannot be determined if applicable water quality standards are not being exceeded.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17908


LOE ID:	27028

Pollutant:	Benthic Community Effects
LOE Subgroup:	Adverse Biological Responses
Matrix:	Water
Fraction:	None

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	37
Number of Exceedances:	37

Data and Information Type:	Benthic macroinvertebrate surveys
Data Used to Assess Water Quality:	Thirty-seven samples of IBI data were taken from May 1998 to May 2007 at two sampling sites. Of the total number of samples, all thirty-seven of the samples exceeded the IBI impairment threshold.
Data Reference:	Stream Bioassessment Data. Co-permitee Data. Collected 2002-2007.

Water Quality Objective/Criterion:	From the San Diego Basin Plan the objective is: All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life. Compliance with this objective will be determined by use of indicator organisms, analyses of species diversity, population density, growth anomalies, bioassays of appropriate duration, or other appropriate methods as specified by the Regional Board.
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:	The Index of Biological Integrity (IBI) is an analytical tool that can be used to assess the biological and physical condition of streams and rivers within a zero to one hundred scoring range: Very Poor 0-19, Poor 20-39, Fair 40-59, Good 60- 79, Very Good 80-100. The IBI score of 39 was set as an impairment threshold because it is a statistical criterion of two standard deviations below the mean reference site score which defines the boundary between 'fair' and 'poor' IBI creek conditions. (Ode, p. 9)
Guideline Reference:	"A Quantitative Tool for Assessing the Integrity of Southern Coastal California Streams". Environmental Management. Volume 35, number 1 (2005): 1-13.

Spatial Representation:	Samples were collected at four sites: SLRR-BR, SLRR-MR, SLRRFR, and SLR6xx on San Luis Rey River.
Temporal Representation:	Sampling occurred annually over an eight year period from May 1998 to October 2006 and during May 2007.
Environmental Conditions:
QAPP Information:	Quality Control for collection and identification was conducted in accordance with the Quality Assurance Manual for Freshwater Bioassessment.
QAPP Information Reference(s):	QUALITY ASSURANCE MANUAL FOR FRESHWATER BIOASSESSMENT Revision 0


DECISION ID	17071

Pollutant:	Selenium
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 not being placed on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Two lines of evidence is available in the administrative record to assess this pollutant. Three of the samples exceed the water quality objective for selenium. Based on the readily available data and information, the weight of evidence indicates that there is insufficient 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 does not 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 18 samples exceed the selenium water quality objective and this exceeds the allowable frequency listed in Table 3.1 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 exceeded at this time.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17071


LOE ID:	21182

Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	3
Number of Exceedances:	2

Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	Three water samples were collected at San Luis Rey River station 903SLSLR2 May 2004, September 2004, March 2005, and April 2005. Two of three samples showed excessive selenium concentrations but one sample was "estimated" according to results in California's Surface Water Ambient Monitoring Program Report, 2007.
Data Reference:	Monitoring data for Region 9

Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (RWQCB, 2007). CTR Freshwater Chronic (CCC) 5 ug/L. (U.S. EPA, 2000).
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:

Spatial Representation:	Water samples were collected at San Luis Rey River station 903SLSLR2.
Temporal Representation:	Samples were collected on May 2004, September 2004, March 2005, and April 2005.
Environmental Conditions:
QAPP Information:	Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):


LOE ID:	30918

Pollutant:	Selenium
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	15
Number of Exceedances:	0

Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	Fifteen water samples were collected at San Luis Rey River station. None of the 15 samples showed excessive selenium concentrations.
Data Reference:	Urban Runoff Monitoring, Volume 1- Final Report.

Water Quality Objective/Criterion:	All waters shall be maintained free of toxic substances in concentrations that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (RWQCB, 2007). CTR Freshwater Chronic (CCC) 5 ug/L. (U.S. EPA, 2000).
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:

Spatial Representation:	Water samples were collected at San Luis Rey River under Benet Rd Bridge north of Highway 76.
Temporal Representation:	Samples were collected on from November 2001 through February 2006.
Environmental Conditions:
QAPP Information:	Quality control for this study was conducted in accordance with the Weston Solution's Quality Assurance Manual.
QAPP Information Reference(s):	Weston Solutions, 2004. Quality Management Manual. March 2004.


DECISION ID	17068

Pollutant:	Sulfates
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 3.2 of the Listing Policy. Under section 3.2 one line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. All four of the samples exceed the water quality objective. 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.All four samples exceeded the sulfate water quality objective and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met. A minimum of five samples is needed for application of table 3.2. 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 it cannot be determined if applicable water quality standards are not being exceeded.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17068


LOE ID:	23500

Pollutant:	Sulfates
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Dissolved

Beneficial Use:	Municipal & Domestic Supply

Number of Samples:	4
Number of Exceedances:	4

Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	Eight water samples were collected at San Luis Rey River station 903SLSLR8 on May 2004, September 2004, March 2005, and April 2005. All four samples showed excessive sulfate concentrations according to results in California's Surface Water Ambient Monitoring Program Report, 2007.
Data Reference:	Monitoring data for Region 9

Water Quality Objective/Criterion:	The recommended secondary drinking water standard for sulfate is 250 mg/l (RWQCB, 2007).
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:

Spatial Representation:	Water samples were collected at San Luis Rey River station 903SLSLR8.
Temporal Representation:	Samples were collected on May 2004, September 2004, March 2005, and April 2005.
Environmental Conditions:
QAPP Information:	Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):


DECISION ID	17074

Pollutant:	Enterococcus
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Source Unknown \| Unknown Nonpoint Source \| Unknown Point Source
Expected TMDL Completion Date:	2021
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Fifteen 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 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. All 15 samples exceed the enterococcus 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17074


LOE ID:	7494

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

Beneficial Use:	Water Contact Recreation

Number of Samples:	15
Number of Exceedances:	15

Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	All fifteen samples collected exceed the water quality objective according to results in the San Diego County Municipal Copermittees Report, 2007. Samples were collected one to four times a year from 2001-2006.
Data Reference:	Urban Runoff Monitoring, Volume 1- Final Report.

Water Quality Objective/Criterion:	From the Basin Plan, the most stringent of the US EPA bacteriological criteria for enterococcus sets a maximum limit at 61 colonies per 100mL (RWQCB, 2007).
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:

Spatial Representation:	Samples were collected at the mass loading station located near the lower boundary of the watershed in Oceanside, under the Benet Road Bridge, north of Highway 76.
Temporal Representation:	Samples were collected one to four times a year from 2001-2006.
Environmental Conditions:	Samples were collected during wet weather. base flow.
QAPP Information:	QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.
QAPP Information Reference(s):


DECISION ID	17075

Pollutant:	Fecal Coliform
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2021
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Eight 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 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. Eight of 15 samples exceeded the fecal coliform 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17075


LOE ID:	7495

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

Beneficial Use:	Water Contact Recreation

Number of Samples:	15
Number of Exceedances:	8

Data and Information Type:	PWS pathogen monitoring (ambient water)
Data Used to Assess Water Quality:	Eight of fifteen samples collected exceed the water quality objective according to results in the San Diego County Municipal Copermittees Report, 2007. Samples were collected one to four times a year from 2001-2006.
Data Reference:	Urban Runoff Monitoring, Volume 1- Final Report.

Water Quality Objective/Criterion:	From the Basin Plan, no more than 10% of the samples during any 30-day period for waters designated for contact recreation shall exceed 400 colonies per 100 ml.
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:	Water Quality Control Plan for the San Diego Basin (9).

Spatial Representation:	Samples were collected at the mass loading station located near the lower boundary of the watershed in Oceanside, under the Benet Road Bridge, north of Highway 76.
Temporal Representation:	Samples were collected one to four times a year from 2001-2006.
Environmental Conditions:	Samples were collected during wet weather.
QAPP Information:	QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.
QAPP Information Reference(s):


DECISION ID	17070

Pollutant:	Phosphorus
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2021
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record to assess this pollutant. All of the 19 samples exceed the water quality objective for phosphorus. 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. All 19 samples exceed the phosphorus 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17070


LOE ID:	7374

Pollutant:	Phosphorus
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	4
Number of Exceedances:	4

Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	All four samples exceed the water quality objective according to results in the Surface Water Ambient Monitoring Program Report, 2007. Samples were collected at each site on the following four dates, May 18-19, 2004, September 13- 14, 2004, March 1- 2, 2005, April 18- 20, 2005.
Data Reference:	Monitoring data for Region 9

Water Quality Objective/Criterion:	Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses. Water Quality Control Plan for the San Diego Basin Goal of 0.1 mg/L for total phosphorus in streams and other flowing waters. (RWQCB, 2007)
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:	Water Quality Control Plan for the San Diego Basin (9).

Spatial Representation:	Samples were collected at San Luis Rey River 8 (station id: 903SLSLR8 lat/long: 33.21494/-117.36837), located on the main stem of the San Luis Rey River.
Temporal Representation:	Samples were collected at each site on the following four dates, May 18-19, 2004, September 13- 14, 2004, March 1- 2, 2005, April 18- 20, 2005.
Environmental Conditions:	The first two sampling events occurred during declining and minimum base flow respectively. The third occurred between storm events and the fourth during high base flow.
QAPP Information:	Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):	2002. Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. California Department of Fish and Game, Monterey, CA.


LOE ID:	7348

Pollutant:	Phosphorus
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	15
Number of Exceedances:	15

Data and Information Type:	Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality:	All fifteen samples exceed the water quality objective according to results in the San Diego County Municipal Copermittees Report, 2007. Samples were collected one to four times a year from 2001-2006.
Data Reference:	Water Quality Control Plan for the San Diego Basin (9).
	Urban Runoff Monitoring, Volume 1- Final Report.

Water Quality Objective/Criterion:	Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses. Water Quality Control Plan for the San Diego Basin Goal of 0.1 mg/L for total phosphorus in streams and other flowing waters. (RWQCB, 2007)
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:	Water Quality Control Plan for the San Diego Basin (9).

Spatial Representation:	Samples were collected at the mass loading station located near the lower boundary of the watershed in Oceanside, under the Benet Road Bridge, north of Highway 76.
Temporal Representation:	Samples were collected one to four times a year from 2001-2006.
Environmental Conditions:	Samples were collected during wet weather.
QAPP Information:	QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.
QAPP Information Reference(s):


DECISION ID	17072

Pollutant:	Total Nitrogen as N
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2021
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence is available in the administrative record to assess this pollutant. Eighteen of the 23 samples exceed the water quality objective for total nitrogen. 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. Eighteen of 23 samples exceed the total nitrogen 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17072


LOE ID:	7355

Pollutant:	Total Nitrogen as N
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	15
Number of Exceedances:	13

Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	Thirteen of fifteen samples exceed the water quality objective according to the results in San Diego County Municipal Copermittees Annual Progress Report, 2007. Samples were collected one to four times a year from 2001-2006.
Data Reference:	Water Quality Control Plan for the San Diego Basin (9).
	Urban Runoff Monitoring, Volume 1- Final Report.

Water Quality Objective/Criterion:	Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses. (RWQCB, 2007) A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total P. These values are not to be exceeded more than 10% of the time unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used. (RWQCB, 2007)
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:	Water Quality Control Plan for the San Diego Basin (9).

Spatial Representation:	Samples were collected at the mass loading station located near the lower boundary of the watershed in Oceanside, under the Benet Road Bridge, north of Highway 76.
Temporal Representation:	Samples were collected one to four times a year from 2001-2006.
Environmental Conditions:	Samples were collected during wet weather.
QAPP Information:	QA/QC conducted according to Federal Regulations under requirements of a NPDES permit.
QAPP Information Reference(s):


LOE ID:	23502

Pollutant:	Total Nitrogen as N
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Total

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	8
Number of Exceedances:	5

Data and Information Type:	Fixed station physical/chemical monitoring (conventional pollutants only)
Data Used to Assess Water Quality:	Five of eight samples exceed the water quality objective according to results in the Surface Water Ambient Monitoring Program Report, 2007. Samples were collected at each site on the following four dates, May 18-19, 2004, September 13-14, 2004, March 1-2, 2005, April 18- 20, 2005.
Data Reference:	Monitoring data for Region 9

Water Quality Objective/Criterion:	Water bodies shall not contain biostimulatory substances in concentrations that promote aquatic growth to the extent that such growths cause nuisance or adversely affect beneficial uses. (RWQCB, 2007) A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total P. These values are not to be exceeded more than 10% of the time unless studies of the specific water body in question clearly show that water quality objective changes are permissible and changes are approved by the Regional Board. Analogous threshold values have not been set for nitrogen compounds; however, natural ratios of nitrogen to phosphorus are to be determined by surveillance and monitoring and upheld. If data are lacking, a ratio of N:P = 10:1, on a weight to weight basis shall be used. (RWQCB, 2007)
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:
Guideline Reference:	Water Quality Control Plan for the San Diego Basin (9).

Spatial Representation:	Samples were collected at monitoring station San Luis Rey River 8 (station id: 903SLSLR8 lat/long: 33.21494/-117.36837).
Temporal Representation:	Samples were collected at each site on the following four dates, May 18-19, 2004, September 13-14, 2004, March 1-2, 2005, April 18- 20, 2005.
Environmental Conditions:	The first two sampling events occurred during declining and minimum base flow respectively. The third sample occurred between storm events and the fourth during high base flow.
QAPP Information:	Quality control for the chemical analysis portion of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):	2002. Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. California Department of Fish and Game, Monterey, CA.


DECISION ID	17073

Pollutant:	Toxicity
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2021
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	This pollutant is being considered for placement on the section 303(d) list under section 3.6 of the Listing Policy. Three lines of evidence are available in the administrative record to assess this pollutant. Six of the samples exceed the water quality objective for toxicity. 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. Six of 23 samples exceed the toxicity water quality objective and this exceeds the allowable frequency listed in Table 3.1 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 be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

SWRCB Board Decision / Staff Recommendation:

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 17073


LOE ID:	23503

Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	15
Number of Exceedances:	3

Data and Information Type:	Ambient toxicity testing (chronic)
Data Used to Assess Water Quality:	Selenastrum capricornutum- One of fifteen samples collected were found to be toxic as determined by the Selenastrum capricornutum growth test, Ceriodaphnia dubia survival/reproductive test. Ceriodaphnia dubia- Two of fifteen samples collected were found to be toxic as determined by the Ceriodaphnia dubia survival/reproductive test. Hyalella azteca - None of the fifteen samples collected were found to be toxic as determined by the Hyalella azteca survival test according to results in the San Diego County Municipal Copermittees Report, 2007.
Data Reference:	Urban Runoff Monitoring, Volume 1- Final Report.

Water Quality Objective/Criterion:	From the Basin Plan, all waters shall be free of toxic substances that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (RWQCB, 2007).
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:	Samples were found to exhibit toxicity when the No Observed Effect Concentration (NOEC) or median lethal concentration (LC50) for any given species was estimated to be less than 100% of the test sample concentration.
Guideline Reference:	Waste Discharge Requirements for Discharges of Urban Runoff From the Municipal Separate Storm Sewer Systems Draining the Watersheds of the County of San Diego, the Incorporated Cities of San Diego, the San Diego Unified Port District, and the San Diego County Regional Airport. Order No. R9-2007-0001.

Spatial Representation:	Samples were collected at mass loading station under the Benet Rd bridge north of highway 76 on the San Luis Rey River.
Temporal Representation:	Samples were collected at from 2001 through 2006
Environmental Conditions:
QAPP Information:	Samples were collected in compliance with Weston's quality assurance plan.
QAPP Information Reference(s):	Weston Solutions, 2004. Quality Management Manual. March 2004.


LOE ID:	7493

Pollutant:	Toxicity
LOE Subgroup:	Toxicity
Matrix:	Water
Fraction:	None

Beneficial Use:	Warm Freshwater Habitat

Number of Samples:	8
Number of Exceedances:	3

Data and Information Type:	Ambient toxicity testing (chronic)
Data Used to Assess Water Quality:	Selenastrum capricornutum- Eight samples were collected and three samples show significant toxicity levels (SL) as determined by the Selenastrum capricornutum growth test. Ceriodaphnia dubia- Eight samples were collected and two samples show significant toxicity levels (SL) as determined by the Ceriodaphnia dubia survival/reproductive test. Hyalella azteca- Eight samples were collected and none show significant toxicity levels (SL) as determined by at least one of the Hyalella azteca survival/growth test according to results in the Surface Water Ambient Monitoring Program Report, 2007. Samples were collected at each site on the following four dates, May 18-19, September 13-14, 2004, March 1-2, April 18 and April 20, 2005.
Data Reference:	Urban Runoff Monitoring, Volume 1- Final Report.
	Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013

Water Quality Objective/Criterion:	From the Basin Plan, all waters shall be free of toxic substances that are toxic to, or that produce detrimental physiological responses in human, plant, animal, or aquatic life (RWQCB, 2007).
Objective/Criterion Reference:	Water Quality Control Plan for the San Diego Basin (9).

Evaluation Guideline:	Waters are considered toxic when samples show significant toxicity levels (SWAMP code SL) when compared to a negative control. Significant toxicity is determined when statistical tests result in an alpha of less than 5% and percent control values less than the evaluation threshold.
Guideline Reference:	Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms. Fourth Edition. Office of Water, U.S. Environmental Protection Agency. Washington, D.C. EPA-821-R-02-013

Spatial Representation:	Samples were collected at monitoring station San Luis Rey River 2 and San Luis Rey River 8.
Temporal Representation:	Samples were collected at each site on the following four dates, May 18-19, September 13-14, 2004, March 1-2, April 18 and April 20, 2005.
Environmental Conditions:
QAPP Information:	Quality control for the chemical anaylsis of this study was conducted in accordance with the California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):


DECISION ID	5961

Pollutant:	Chloride
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2006)
Revision Status	Original
Sources:	Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

RWQCB Board Decision / Staff Recommendation:	No new data were assessed for 2008. The decision has not changed.

SWRCB Board Decision / Staff Recommendation:	N/A

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 5961


LOE ID:	4728

Pollutant:	Chloride
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded

Beneficial Use:	Municipal & Domestic Supply

Number of Samples:	0
Number of Exceedances:	0

Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference pre-2006 303(d)

Water Quality Objective/Criterion:	Unspecified
Objective/Criterion Reference:	Placeholder reference pre-2006 303(d)

Evaluation Guideline:	Unspecified
Guideline Reference:	Placeholder reference pre-2006 303(d)

Spatial Representation:	Unspecified
Temporal Representation:	Unspecified
Environmental Conditions:	Unspecified
QAPP Information:	Unspecified
QAPP Information Reference(s):


DECISION ID	5963

Pollutant:	Total Dissolved Solids
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2006)
Revision Status	Original
Sources:	Agriculture-storm runoff \| Flow Regulation/Modification \| Golf course activities \| Industrial Point Sources \| Natural Sources \| Surface Mining \| Unknown Nonpoint Source \| Unknown Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Weight of Evidence:	303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.

RWQCB Board Decision / Staff Recommendation:	No new data were assessed for 2008. The decision has not changed.

SWRCB Board Decision / Staff Recommendation:	N/A

USEPA Decision:

Lines of Evidence (LOEs) for Decision ID 5963


LOE ID:	4729

Pollutant:	Total Dissolved Solids
LOE Subgroup:	Pollutant-Water
Matrix:	Water
Fraction:	Not Recorded

Beneficial Use:	Agricultural Supply

Number of Samples:	0
Number of Exceedances:	0

Data and Information Type:	Not Specified
Data Used to Assess Water Quality:	Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference:	Placeholder reference pre-2006 303(d)

Water Quality Objective/Criterion:	Unspecified
Objective/Criterion Reference:	Placeholder reference pre-2006 303(d)

Evaluation Guideline:	Unspecified
Guideline Reference:	Placeholder reference pre-2006 303(d)

Spatial Representation:	Unspecified
Temporal Representation:	Unspecified
Environmental Conditions:	Unspecified
QAPP Information:	Unspecified
QAPP Information Reference(s):