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

Supporting Information

Regional Board 9 - San Diego Region

Water Body Name:	Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth
Water Body ID:	CAC9011300020090525212513
Water Body Type:	Coastal & Bay Shoreline


DECISION ID	76517	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

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:	2025
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. Combining the latest data with old data, 97 of the 223 samples exceed the Water Quality Objective for enterococcus of a geomean of 35 cfu/100ml in a 30-day period for the protection of REC-1. Multiple samples also do not meet the respective WQOs for fecal coliform and total coliform. 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. Combining the latest data with old data, 97 out of 223 samples exceed the Water Quality Objective for enterococcus of a geomean of 35 cfu/100ml in a 30-day period for the protection of REC-1 and this exceeds the allowable frequency listed in Table 4.2 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are met.

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 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29741

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from 1999 through 2006. Total number of Enterococcus samples was 778 and 89 monthly geomeans were calculated. Allof the geomeans exceeded the geomean water quality objective.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74532

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

134

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

None of the 134 samples exceeded the total coliform objective. For these stations, samples were collected from surfzone upcoast and surfzone downcoast. The higher of the two values was used for the geomean calculation.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Aliso Creek Mouth (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

31093

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:

Orange County collected Beach monitoring data within the time period from January 1999 through December 2006.
A total of 51 monthly geomeans were calculated for data collected during the time frame of April 1st to October 31st (AB411 data) within the aforementioned time period. Of the 51 geomeans two exceeded the geomean water quality objective.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

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

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29742

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from 1999 through 2006. Total number of Enterococcus samples was 778. Between March 2002 and December 2006, 48 samples were correlated with rainfalll events with 43 exceeding the single sample maximum objective. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Comparisons to water quality objectives 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.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74509

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

148

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Twelve of the 148 samples exceeded the enterococcus objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. These results represent the higher of the two values.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The single sample enterococcus concentration shall not exceed more than 104/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

Objective/Criterion Reference:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site ACM1 Aliso Creek Mouth (surzone upcoast and downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29740

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

778

Number of Exceedances:

491

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from 1999 through 2006. Total number of samples collected was 778 with 491 samples exceeding the single sample maximum.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29739

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from 1999 through 2006. Total number of fecal coliform samples was 789. Between March 2002 and December 2006, 44 samples were correlated with rainfalll events with 28 exceeding the single sample maximum. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Comparisons to water quality objectives 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.

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:

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:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

31092

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:

Orange County collected Beach monitoring data within the time period from January 1999 through December 2006.
A total of 56 monthly geomeans were calculated for data collected during the time frame of April 1st to October 31st (AB411 data) within the aforementioned time period. Of the 51 geomeans 31 exceeded the geomean water quality objective.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:
Geomean: Fecal coliform density shall not exceed 200 per 100ml within any 30 day period (SWRCB, 2005).

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74519

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

148

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Two of the 148 samples exceeded the fecal coliform objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. These results represent the higher of the two values.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The single sample fecal coliform concentration shall not exceed more than 400/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

Objective/Criterion Reference:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site ACM1 Aliso Creek Mouth (surzone upcoast and downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29738

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from 1999 through 2006. Total number of fecal coliform samples was 789 and 89 monthly geomeans were calculated. Of the 89 geomeans, 54 exceeded the geomean water quality objective.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74520

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

134

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

None of the 134 geomeans exceeded the fecal coliform objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The higher of the two values was used for the geomean calculation.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Coastal Aliso Creek Mouth (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29737

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

789

Number of Exceedances:

234

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through May 2006. Total number of fecal coliform samples collected was 789 with 234 exceeding the single sample maximum.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

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

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

30187

Pollutant:

Indicator Bacteria

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

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

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

Data Reference:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

Unspecified

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

31091

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29734

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

782

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Shoreline beach monitoring data was collected by the County of Orange from January 1999 through May 2006. The number of samples collected was 782 individual bacteria samples. From the 782 samples, 93 samples exceeded single sample maximum water quality objective.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long: 33.51051/-117.75286.

Temporal Representation:

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

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74524

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

148

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Two of the 148 samples exceeded the total coliform objective. For these water bodies, samples were collected from surfzone upcoast and surfzone downcoast. These results represent the higher of the two values.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The single sample total coliform concentration shall not exceed more than 10,000/100ml. Water Quality Control Plan for Ocean Waters of California. Region 9 Basion Plan.

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from site ACM1 Aliso Creek Mouth (surzone upcoast amd surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to June 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29735

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:

Eighty-four of 89 monthly geomeans exceeded the geomean water quality objective.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

29736

Pollutant:

Total Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PWS pathogen monitoring (ambient water)

Data Used to Assess Water Quality:

Shoreline monitoring data was collected by the County of Orange from January 1999 through May 2006. Total number of total coliform samples was 782. Between March 2002 and December 2006, 44 samples were correlated with storm events. From the 44 samples, 22 exceeded the single sample maximum. This information will not be used in determining a listing decision, but is of interest to the Regional Board and has been included here as additional anecdotal information.

Data Reference:

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

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

From the Ocean Plan the objectives are:

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

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

Comparisons to water quality objectives 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.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the station C1 located near the mouth of Aliso Creek in the Aliso Beach HSA. representing approximately 0.29 miles of shoreline. Lat/Long:33.51051/-117.75286.

Temporal Representation:

Samples were collected weekly from January 1999 through May 2006; however, rainfall data is only available from March 2002 through December 2007.

Environmental Conditions:

QAPP Information:

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

QAPP Information Reference(s):

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

Line of Evidence (LOE) for Decision ID 76517, Indicator Bacteria	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74518

Pollutant:

Enterococcus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

134

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Eight of the 134 geomeans exceeded the enterococcus objective. For this station, samples were collected from surfzone upcoast and surfzone downcoast. The higher of the two values was used for the geomean calculation.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The geometric mean for enterococcus shall not exceed 35 MPN/100 mL. Water Quality Control Plan for the San Diego Basin. California Ocean Plan.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected from Aliso Creek Mouth (surfzone upcoast and surfzone downcoast).

Temporal Representation:

The samples were collected once a week from July 2006 to 2009.

Environmental Conditions:

QAPP Information:

The samples were collected and analyzed under the Quality Assurance Management Plan for The Orange County Stormwater Program. Coastal Stormdrain Outfall Monitoring Program.

QAPP Information Reference(s):


DECISION ID	84038	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

Pollutant:	Chlorpyrifos
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 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. Zero of the Five samples exceed the Water Quality Criteria for Chlorpyrifos. 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 CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Five samples exceeded the Water Quality Criteria for Chlorpyrifos and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not 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 placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

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 84038, Chlorpyrifos	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74507

Pollutant:

Chlorpyrifos

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the five samples exceeded the Criteria Continuous Concentration for Chlorpyrifos of 9 ng/L. However, for three samples the Reporting limit exceeded the evaluation guideline and these data were not usable.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California's Ocean Plan states that, "The concentration of organic materials in marine sediments shall not be increased to levels that would degrade marine life.

Objective/Criterion Reference:

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

Evaluation Guideline:

The Criteria Continuous Concentration for chlorpyrifos in saltwater is 9 ng/L.

Guideline Reference:

Water quality criteria for diazinon and chlorpyrifos. Administrative Report 00-3. Rancho Cordova, CA: Pesticide Investigations Unit, Office of Spills and Response. CA Department of Fish and Game

Spatial Representation:

Samples were collected from Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth at locations ACM-1 and ACM-1d.

Temporal Representation:

Samples were collected in September 2006; June, September and December 2007; and January 2008.

Environmental Conditions:

Samples were collected in the dry season and during storm events.

QAPP Information:

Data were submitted with the County of Orange Stormwater Program Quality Assurance Management Plan (QAMP) dated January 2010. However, data were collected prior to the development of this QAMP, therefore the quality of these data are unknown. For three samples the Reporting Limit of 10 ng/L is higher than the criteria of 9ng/L which makes these data not usable.

QAPP Information Reference(s):


DECISION ID	84076	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

Pollutant:	Diazinon
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 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. Zero of the Eight samples exceed the Water Quality Criteria for Diazinon. 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 CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Water Quality Criteria for Diazinon and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not 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 placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

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 84076, Diazinon	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74508

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the Criteria Continuous Concentration for diazinon of 820 ng/L.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California's Ocean Plan states that, "The concentration of organic materials in marine sediments shall not be increased to levels that would degrade marine life.

Objective/Criterion Reference:

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

Evaluation Guideline:

The Criteria Continuous Concentration for diazinon in saltwater is 820 ng/L.

Guideline Reference:

Aquatic Life Ambient Water Quality Criteria for Diazinon

Spatial Representation:

Samples were collected from Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth at locations ACM-1 and ACM-1d.

Temporal Representation:

Samples were collected from ACM-1 on September and December in 2006; and January of 2008. Samples were collected from ACM-1d on October 2007; May, October, December 2008; and April 2009.

Environmental Conditions:

Samples were collected in the dry season and during storm events.

QAPP Information:

QAPP Information Reference(s):


DECISION ID	84077	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

Pollutant:	Malathion
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 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. Zero of the Eight samples exceed the Water Quality Criteria for Malathion. 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 CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Water Quality Criteria for Malathion and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not 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 placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

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 84077, Malathion	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74521

Pollutant:

Malathion

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical (conventional plus toxic pollutants)

Data Used to Assess Water Quality:

None of the eight samples exceeded the maximum concentration for Malathion of 100 ng/L.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

California's Ocean Plan states that, "The concentration of organic materials in marine sediments shall not be increased to levels that would degrade marine life.

Objective/Criterion Reference:

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

Evaluation Guideline:

The maximum (Instantaneous) concentration for Malathion in saltwater is 100 ng/L.

Guideline Reference:

Quality Criteria for Water. USEPA Office of Water and Hazardous Materials. Washington, D.C

Spatial Representation:

Samples were collected from Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth at locations ACM-1 and ACM-1d.

Temporal Representation:

Samples were collected from ACM-1 on September and December in 2006; and January of 2008. Samples were collected from ACM-1d on October 2007; May, October, December 2008; and April 2009.

Environmental Conditions:

Samples were collected in the dry season and during storm events.

QAPP Information:

QAPP Information Reference(s):


DECISION ID	84120	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

Pollutant:	Nitrogen, ammonia (Total Ammonia)
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.1 of the Listing Policy. Under section 3.1 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. Zero of the Eight samples exceed the Water Quality Objective for Nitrogen, ammonia (Total Ammonia). 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 CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of Eight samples exceeded the Nitrogen, ammonia (Total Ammonia) and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 16 samples is needed to determine if a beneficial use is fully supported using table 3.1. 4. Pursuant to Section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not 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 placed on the section 303(d) list. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

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 84120, Nitrogen, ammonia (Total Ammonia)	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74522

Pollutant:

Nitrogen, ammonia (Total Ammonia)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of eight sample medians exceeded the water quality objective for total ammonia. Each samples was calculated a median using the sample and all other samples taken previously within a 180-day period.

Data Reference:

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

SWAMP Data:

Non-SWAMP

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. The Ocean Plan objective for total ammonia as nitrogen is a moving 6-month median of 600 ug/L.

Objective/Criterion Reference:

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at station ACM-1.

Temporal Representation:

Samples were collected from September 2006 to April 2009.

Environmental Conditions:

QAPP Information:

A signed QAPP was included with the stated goal of ensuring the consistent collection of accurate water quality information that will used to satisfy the objectives of the Orange County Stormwater Program.

QAPP Information Reference(s):


DECISION ID	84165	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

Pollutant:	pH
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 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. Zero of the One samples exceed the Water Quality Objective for pH. 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 CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of One samples exceeded the Water Quality Objective for pH and this sample size is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating. A minimum of 26 samples is needed to determine if a beneficial use is fully supported using 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.

Regional Board Decision 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. The readily available data and information is insufficient to determine, with the power and confidence of the Listing Policy, the applicable beneficial use support rating.

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 84165, pH	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74523

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 1 sample of pH data had no exceedences.

Data Reference:

Data for bacteria in various waterbodies, Feb. 2005-May 2007

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In bays and estuaries the pH shall not be depressed below 7.0 nor raised above 9.0.

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the Aliso Creek at mouth - estuary station.

Temporal Representation:

One sample was collected on 5/5/2007.

Environmental Conditions:

QAPP Information:

NPDES quality assurance.

QAPP Information Reference(s):


DECISION ID	84122	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

Pollutant:	Toxicity
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)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2029
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.6 of the Listing Policy. Under section 3.6 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. Three of six samples exhibited water 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 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. Three of six samples exhibited water toxicity 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.

Regional Board Decision 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.

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 84122, Toxicity	Region 9
Pacific Ocean Shoreline, Aliso HSA, at Aliso Creek mouth

LOE ID:

74533

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

None

Beneficial Use:

Marine Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

TOXICITY TESTING

Data Used to Assess Water Quality:

Six samples were collected to test for toxicity. Three of the nine samples exhibited statistically and biologically significant toxicity. The toxicity tests that exhibited significant toxicity included Mysid biomass and survival and Purple Urchin development and fertilization.

Data Reference:

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

SWAMP Data:

Non-SWAMP

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

Objective/Criterion Reference:

Water Quality Control Plan for the San Diego Basin

Evaluation Guideline:

Toxicity is defined as a statistically significant effect in the sample exposure compared to the control using EPA-recommended hypothesis testing. The t-test is used to determine if there is a statistically significant decrease in organism response in the sample as compared to the control. Additionally, the biological significance of the sample was evaluated by determining whether the sample response was lower than the evaluation threshold.

Guideline Reference:

Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition. EPA-821-R-02-012

Guideline Reference:

Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, Fourth Edition. U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-821-R-02-013

Spatial Representation:

The samples were collected at station ACM1d in the ocean close to Aliso Creek Mouth.

Temporal Representation:

The samples were collected from October 2007 to February 2010.

Environmental Conditions:

QAPP Information:

The data collected under the Quality Assurance Management Plan for The Orange County Stormwater Program. The SWAMP measurement quality objectives were followed for toxicity data. The performance of toxicity bioassays and evaluation of reference toxicants were performed using USEPA and Standard Methods.

QAPP Information Reference(s):