Final California 2010 Integrated Report (303(d) List/305(b) Report)

A Quantitative Tool for Assessing the Integrity of Southern Coastal California Streams. Environmental Management. Volume 35, number 1 (2005): pp. 1-13

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:

Spatial Representation:

Samples were collected at one site: CC-FB on Chollas Creek.

Temporal Representation:

Sampling occurred during during May and October annually from May 2003 to May 2006 and one event on 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

Line of Evidence (LOE) for Decision ID 17886, Benthic Community Effects	Region 9
Chollas Creek

LOE ID:

26521

Pollutant:

Benthic Community Effects

LOE Subgroup:

Adverse Biological Responses

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

One sample of IBI data was taken on November 2005 at one sampling site. Of one sample, that one sample exceeded the IBI impairment threshold.

Data Reference:

Fish and Game IBI Data

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

A Quantitative Tool for Assessing the Integrity of Southern Coastal California Streams. Environmental Management. Volume 35, number 1 (2005): pp. 1-13

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at one site: 908CLCANB on Chollas Creek.

Temporal Representation:

Sampling occurred during one event on November 2005.

Environmental Conditions:

QAPP Information:

Quality Control for collection and identification was conducted in accordance with the Quality Assurance Project Plan for the California Stream Bioassessment Procedure and the State of California, California Monitoring an Assessment Program: "CMAP", Quality Assurance Project Plan.

QAPP Information Reference(s):

State of California, California Monitoring and Assessment Program: "CMAP".

Quality Assurance Project Plan for the California Stream Bioassessment Procedure

The San Diego Stream Team Quality Assurance Project Plan


DECISION ID	16712	Region 9
Chollas Creek

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:	Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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 are available in the administrative record to assess this pollutant. Thirty-nine of the 40 samples exceed the Basin Plan 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. Thirty-nine of the 40 samples exceed the Basin Plan water quality objective for phosphorus 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.

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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 16712, Phosphorus	Region 9
Chollas Creek

LOE ID:

6706

Pollutant:

Phosphorus

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Thirty-nine of 40 samples exceeded the warm freshwater habitat water quality objective for Phosphorus outlined in the Urban Runoff Monitoring, Final Report, 2005-2006. Samples were collected two to four times a year from 1994-2006.

Data Reference:

SWAMP Data:

Non-SWAMP

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:

Evaluation Guideline:

Guideline Reference:

Water Quality Laboratory. Quality Assurance Manual

Spatial Representation:

Samples were collected at the mass loading station located within the Chollas sub-watershed in the north fork of the Chollas Creek near the intersection of 33rd and Durant Streets.

Temporal Representation:

Samples were collected two to four times a year from 1994 -2006.

Environmental Conditions:

Samples were collected during wet weather.

QAPP Information:

Quality Assurance conducted according to the City of San Diego's Water Quality Laboratory Quality Assurance Manual.

QAPP Information Reference(s):


DECISION ID	16713	Region 9
Chollas Creek

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:	Source Unknown
Expected TMDL Completion Date:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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. Four lines of evidence are available in the administrative record to assess this pollutant. Thirty-eight of the 40 samples exceed the Basin Plan water quality objective for total nitrogen as N. 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. Thirty-eight of the 40 samples exceed the Basin Plan water quality objective for total nitrogen as N 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.

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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 16713, Total Nitrogen as N	Region 9
Chollas Creek

LOE ID:

7363

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

The one sample collected exceeds the water quality objective according to results in the Surface Water Ambient Monitoring Program Report, 2006. The sample was collected on June 2, 2006.

Data Reference:

Monitoring data for Region 9

SWAMP Data:

SWAMP

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.
A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total phosphorus, 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:

Evaluation Guideline:

Guideline Reference:

2002. Quality Assurance Management Plan for the State of California's Surface Water Ambient Monitoring Program. California Department of Fish and Game, Monterey, CA

Spatial Representation:

Samples were collected at the monitoring station Chollas Creek 4 located on the main stem of Chollas Creek (lat/long: 32.69629/-117.12237).

Temporal Representation:

The sample was collected on June 2, 2006.

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):

Line of Evidence (LOE) for Decision ID 16713, Total Nitrogen as N	Region 9
Chollas Creek

LOE ID:

6728

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Fixed station physical/chemical monitoring (conventional pollutants only)

Data Used to Assess Water Quality:

Thirty-seven of 39 samples exceeded the warm freshwater habitat water quality objective for Total Nitrogen outlined in the Urban Runoff Monitoring, Final Report, 2005-2006. Samples were collected two to four times a year from 1994 -2006.

Data Reference:

SWAMP Data:

Non-SWAMP

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.
A desired goal in order to prevent plant nuisance in streams and other flowing waters appears to be 0.1 mg/L total phosphorus, 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:

Evaluation Guideline:

Guideline Reference:

Water Quality Laboratory. Quality Assurance Manual

Spatial Representation:

Samples were collected at the mass loading station located within the Chollas sub-watershed in the north fork of the Chollas Creek near the intersection of 33rd and Durant Streets.

Temporal Representation:

Samples were collected two to four times a year from 1994 - 2006.

Environmental Conditions:

Samples were collected during wet weather.

QAPP Information:

Quality assurance conducted according to the City of San Diego's Water Quality Department quality assurance manual.

QAPP Information Reference(s):


DECISION ID	16717	Region 9
Chollas Creek

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

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.11 of the Listing Policy. Under section 3.11 listing may be proposed based on the situation-specific weight of evidence. Eight lines of evidence are available in the administrative record to assess this pollutant, these lines of evidence consist of interpretation of data from field survey/photo evidence. 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. Eight lines of evidence indicate that there is sufficient justification available in favor of placing this water segment-pollutant combination to the Section 303(d) list per Section 3.11 of the Listing Policy.

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 not met and trash 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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

26358

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body.

While conducting annual dry weather monitoring at 35 - 38 sites in the Chollas and Paleta Creek watersheds from 2003-2006, the City of San Diego's Creek Refuse Assessment Program estimated the amount of trash in both creeks. In 2003, the amount of trash was estimated to be 500 cu ft. In 2004, the amount estimated was 500 cu ft. In 2005, the amount estimated was 1250 cu ft. and in 2006, 200 cu ft. Trash was observed at nearly every monitoring location (City of San Diego, 2007).

Data Reference:

City of SD Trash 2007. Data on trash in Chollas Creek, 2003-2007. Semi-Annual Reports: Addressing Floating Material in Chollas and Paleta Creeks

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The survey area covered 35 - 38 locations in Chollas and Paleta Creek.

Temporal Representation:

Dry weather monitoring took place between 2003 and 2006.

Environmental Conditions:

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6125

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body. The San Diego County Municipal Storm Water Copermittees identified trash as a constituent of concern in the Pueblo San Diego Hydrologic Unit (which includes the Chollas Hydrologic Subarea) (San Diego County Municipal Storm Water Copermittees, 2007).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

I Love a Clean San Diego. 2007a. Photos of trash in Chollas Creek, April 28, 2007

Spatial Representation:

Pueblo San Diego Hydrologic Unit. The Chollas Creek watershed is a hydrologic subarea within this larger watershed.

Temporal Representation:

Conclusions made in reports dated 2007.

Environmental Conditions:

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6121

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash conditions, where trash distracts the eye at first glance and is one of the first things noticeable about the water body. The presence of trash impacts the non contact recreational uses of Chollas Creek and San Diego Bay. Between 2002 and 2007, 9.2 tons (18,475 lbs) of trash were removed from Chollas Creek.

In September 2002, 1253 pounds of trash were removed from the mouth of Chollas Creek. In September 2003, 643.5 pounds of trash were removed from Chollas Creek. In April 2004, 1525 pounds of trash were removed from the mouth of Chollas Creek. In September 2004, 278.5 pounds of trash were removed from the mouth of Chollas Creek. In April 2005, 1560 pounds of trash were removed from the mouth of Chollas Creek. In September 2005, 940 pounds of trash were removed from the mouth of Chollas Creek. In April 2006, 1600 pounds of trash were removed from the mouth of Chollas Creek. In September 2006, 2700 pounds of trash were removed from the mouth of Chollas Creek. In April 2007, 7975 pounds of trash were removed from the mouth of Chollas Creek, including 575 pounds of hazardous and electronic wastes (I Love a Clean San Diego, 2007b)

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

United States Navy. 2001. Photos of trash in Chollas Creek, January 11, 2001

Spatial Representation:

Trash was collected in Chollas Creek near Harbor Drive at the mouth of Chollas Creek.

Temporal Representation:

Cleanup efforts in Chollas Creek took place annually or biannually from 2002 2007.

Environmental Conditions:

Data is from spring and fall, representing conditions at the start and end of the rainy season.

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6110

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body. All three photos from the United States Navy exhibit abundant trash within the creek after a storme event. (United States Navy, 2001).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Photos were taken of trash caught by the boom located at the mouth of Chollas Creek in San Diego Bay after a rain event.

Temporal Representation:

Photos were taken January 11, 2001.

Environmental Conditions:

Photos were taken following a rain event.

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6104

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body. Inspections of trash conditions in Chollas Creek were conducted August 31, 2001, February 15, 2002, November 8, 2002, May 14, 2004, and September 14, 2006. Photos were collected during the inspections. The photos were reviewed to assess trash conditions in Chollas Creek.

All seven photos from August 31, 2001 exhibit poor trash conditions within the creek. One of three photos from February 15, 2002 exhibit poor trash conditions within the creek. All fifteen photos from November 8, 2002 exhibit poor trash conditions within the creek. All four photos from May 14, 2004 exhibit poor trash conditions within the creek. Sixteen of twenty photos from September 14, 2006 exhibit abundant trash within the creek (San Diego Regional Water Quality Control Board, 2006).

Data Reference:

San Diego Regional Water Quality Control Board. 2001-2006. Facility Inspection Photos of Chollas Creek Trash

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

I Love a Clean San Diego. 2007a. Photos of trash in Chollas Creek, April 28, 2007

Spatial Representation:

Photos were taken at eight Chollas Creek locations over the course of the inspections.

Temporal Representation:

Photos were taken in August 31, 2001, February 15, 2002, November 8, 2002, May 14, 2004, and September 14, 2006.

Environmental Conditions:

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6111

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body. Three of three photos taken prior to the I Love a Clean San Diego Creek to Bay Cleanup at the mouth of Chollas Creek exhibit excessive trash conditions within the creek channel. Other photos exhibit large amounts of trash removed from the mouth of Chollas Creek (I Love a Clean San Diego, 2007a).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Email correspondence from T. Michael Chee of NASSCO to John Robertus of the San Diego Regional Water Quality Control Board, regarding trash conditions at mouth of Chollas Creek.

Spatial Representation:

Photos were taken of trash located at the mouth of Chollas Creek near Harbor Drive.

Temporal Representation:

Photos were taken April 28, 2007.

Environmental Conditions:

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6108

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body. Five of the six photos provided from Mike Chee of National Steel and Shipbuilding Company (NASSCO) exhibit excessive trash conditions within the NASCCO leasehold, which is adjacent to the mouth of Chollas Creek. This trash is reported to have originated from Chollas Creek after a storm event. Photos were taken January 10, 2005.(Chee, T.M., 2005).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

City of SD Trash 2007. Data on trash in Chollas Creek, 2003-2007. Semi-Annual Reports: Addressing Floating Material in Chollas and Paleta Creeks

Spatial Representation:

Photos were taken of trash flushed down Chollas Creek into NASSCO's leasehold . The NASSCO leasehold is adjacent to the mouth of Chollas Creek in San Diego Bay.

Temporal Representation:

Photos were taken January 10, 2005.

Environmental Conditions:

QAPP Information:

None

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 16717, Trash	Region 9
Chollas Creek

LOE ID:

6123

Pollutant:

Trash

LOE Subgroup:

Pollutant-Nuisance

Matrix:

-N/A

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Occurrence of conditions judged to cause impairment

Data Used to Assess Water Quality:

Trash distracts the eye at first glance and is one of the first things noticeable about the water body. Between 2002 and 2005, approximately 12.3 tons of trash was collected in Chollas Creek and at the Mouth of Chollas Creek near San Diego Bay.

An April 9, 2005 cleanup effort of Chollas Creek west of 38th Street and north of Alpha Street yielded over one ton of trash.

A September 17, 2005 cleanup effort of Chollas Creek near the corner of 47th Street and Castana Street yielded approximately 500 pounds of trash and debris.

A September 21, 2002 cleanup effort of Chollas Creek at Winona Avenue yielded approximately 490 pounds of trash.

A September 21, 2002 cleanup effort of Chollas Creek at 33rd Street and McLarens Lane yielded approximately 445 pounds of trash.

In its February 14, 2003 report, the City of San Diego states that the United States Navy removed 10.6 tons of trash from the mouth of Chollas Creek at the location of its trash boom.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Floating Material Waters shall not contain floating material, including solids, liquids, foams, and scum in concentrations which cause nuisance or adversely affect beneficial uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Trash was collected at five locations that covers approximately 12 miles along Chollas Creek channel.

Temporal Representation:

The trash collection efforts took place between 2002 and 2005.

Environmental Conditions:

Data is from spring and fall, representing conditions at the start and end of the rainy season.

QAPP Information:

None

QAPP Information Reference(s):


DECISION ID	5524	Region 9
Chollas Creek

Pollutant:	Cadmium
Final Listing Decision:	Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Delist from 303(d) list (TMDL required list)(2006)
Revision Status	Original
Reason for Delisting:	Applicable WQS attained; reason for recovery unspecified
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under section 4.1 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. None of the samples exceed the CTR acute criterion and one sample exceeds the chronic criterion. Over 40 measurements are available. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of removing this water segment-pollutant combination from the section 303(d) list. The Chollas Creek Metals TMDL was approved by RWQCB in 2004 and subsequently approved by USEPA. 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. One of 42 samples exceeded the chronic criterion and no samples out of the 47 exceeded the acute criterion. These do not exceed the allowable frequency listed in Table 4.1 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:	No new data were assessed for 2008. The decision has not changed.

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.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 5524, Cadmium	Region 9
Chollas Creek

LOE ID:

3354

Pollutant:

Cadmium

LOE Subgroup:

Narrative Description Data

Matrix:

Not Specified

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

A TMDL and implementation plan has been approved for this water segment-pollutant combination. The Chollas Creek Metals TMDL was approved by RWQCB in 2004 and subsequently approved by USEPA.

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 5524, Cadmium	Region 9
Chollas Creek

LOE ID:

3355

Pollutant:

Cadmium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

One of 42 samples exceeded the CTR - CCC criteria for dissolved cadmium (San Diego RWQCB, 2001b).

Data Reference:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

CTR Dissolved Cadmium Criterion for continuous concentration (CCC) in water for the protection of aquatic life is expressed as a function of the total hardness of the water body. The aquatic life criteria will vary depending of total hardness reported at the sampling site. The CCC for dissolved cadmium is the highest concentration to which aquatic life can be exposed for an extended period of time (four days) without deleterious effects. This criterion is linked and applicable for the protection of aquatic life Beneficial Uses.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Six stations were sampled throughout the Chollas Creek watershed.

Temporal Representation:

Five samples were collected in June 1991 and March 1992. Forty-two samples were collected as part of the MS4 storm water permit between February 1994 and February 2003.

Environmental Conditions:

Chollas Creek is an urban creek that runs through portions of San Diego, La Mesa, and Lemon Grove before emptying into San Diego Bay.

QAPP Information:

NPDES permit.

QAPP Information Reference(s):


DECISION ID	4157	Region 9
Chollas Creek

Pollutant:	Diazinon
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2006)
Revision Status	Original
Sources:	Nonpoint Source \| Point Source
TMDL Name:	Chollas Creek Diazinon
TMDL Project Code:	56
Date TMDL Approved by USEPA:	11/03/2003
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for removal from the section 303(d) list under section 4.6 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Four lines of evidence are available in the administrative record to assess this pollutant. Sixteen of 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 against removing this water segment-pollutant combination from the 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. Sixteen of 20 samples exceeded the toxicity water quality objective 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.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 4157, Diazinon	Region 9
Chollas Creek

LOE ID:

25002

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Ambient toxicity testing (chronic)

Data Used to Assess Water Quality:

Selenastrum capricornutum-
None of the 18 samples were found to be toxic as determined by at the Selenastrum capricornutum growth test.

Ceriodaphnia dubia-
Nine of 18 samples were found to be toxic as determined by the Ceriodaphnia dubia survival/reproductive test.

Hyalella azteca-
Twelve of eighteen samples were found to be toxic as determined by the Hyalella azteca survival test according to results in the San Diego County Municipal Copermittees Urban Runoff Monitoring Report, 2007. Samples were collected 2002 and 2006.

Data Reference:

Results of Toxicity Testing for Aliso, Poggi, and Chollas Creeks

SWAMP Data:

Non-SWAMP

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:

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

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:

Spatial Representation:

Samples were collected at the mass loading station for Chollas Creek. The station (SD 8) is located near 33 rd and Durant Street.

Temporal Representation:

The samples were collected on from 2002 through 2006.

Environmental Conditions:

QAPP Information:

Quality assurance conducted according to the Weston Solution Quality assurance plan.

QAPP Information Reference(s):

Weston Solutions, 2004. Quality Management Manual. March 2004 (Revised December 2009).

Line of Evidence (LOE) for Decision ID 4157, Diazinon	Region 9
Chollas Creek

LOE ID:

7484

Pollutant:

Toxicity

LOE Subgroup:

Toxicity

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Ambient toxicity testing (chronic)

Data Used to Assess Water Quality:

Selenastrum capricornutum-
One sample was collected and it shows significant toxicity as determined by the Selenastrum capricornutum growth test.

Ceriodaphnia dubia-
One sample was collected and it shows significant toxicity as determined by the Ceriodaphnia dubia survival/reproductive test according to results in a report submitted by Nautilus Environmental, 2006. The samples were collected on June 1-2, 2006.

Data Reference:

Results of Toxicity Testing for Aliso, Poggi, and Chollas Creeks

SWAMP Data:

Non-SWAMP

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:

Results of Toxicity Testing for Aliso, Poggi, and Chollas Creeks

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at the monitoring station Chollas Creek 4 located on the main stem of Chollas Creek (lat/long: 32.69629/-117.12237).

Temporal Representation:

The samples were collected on June 2, 2006.

Environmental Conditions:

QAPP Information:

Toxicity test results met quality assurance requirements of the toxicity laboratory.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 4157, Diazinon	Region 9
Chollas Creek

LOE ID:

26373

Pollutant:

Sediment Toxicity

LOE Subgroup:

Toxicity

Matrix:

Sediment

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Ambient toxicity testing (chronic)

Data Used to Assess Water Quality:

Hyallela azteca-
One sample was collected and it shows significant toxicity as determined by both of the freshwater amphipod, Hyalella azteca, survival/growth test according to results in a report submitted by Nautilus Environmental, 2006. The samples were collected on June 1-2, 2006.

Data Reference:

SWAMP Data:

Non-SWAMP

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:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at the monitoring station Chollas Creek 4 located on the main stem of Chollas Creek (lat/long: 32.69629/-117.12237).

Temporal Representation:

The samples were collected on June 2, 2006.

Environmental Conditions:

QAPP Information:

Toxicity test results met quality assurance requirements of the toxicity laboratory.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 4157, Diazinon	Region 9
Chollas Creek

LOE ID:

3353

Pollutant:

Diazinon

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	7141	Region 9
Chollas Creek

Pollutant:	Copper
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:	Nonpoint Source \| Point Source
Expected TMDL Completion Date:	2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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.

Regional Board Decision Recommendation:	No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.

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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 7141, Copper	Region 9
Chollas Creek

LOE ID:

3356

Pollutant:

Copper

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Agricultural Supply

Number of Samples:

Number of Exceedances:

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)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	6507	Region 9
Chollas Creek

Pollutant:	Indicator Bacteria
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:	Nonpoint Source \| Point Source \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2005
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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.

Regional Board Decision Recommendation:	No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.

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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 6507, Indicator Bacteria	Region 9
Chollas Creek

LOE ID:

4447

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.

Data Reference:

SWAMP Data:

Non-SWAMP

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	6875	Region 9
Chollas Creek

Pollutant:	Lead
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:	Atmospheric Deposition \| Landfills \| Nonpoint Source \| Point Source \| Surface Runoff \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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.

Regional Board Decision Recommendation:	No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.

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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 6875, Lead	Region 9
Chollas Creek

LOE ID:

3357

Pollutant:

Lead

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

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:

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Temporal Representation:

Environmental Conditions:

QAPP Information:

QA Info Missing

QAPP Information Reference(s):


DECISION ID	6593	Region 9
Chollas Creek

Pollutant:	Zinc
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:	Atmospheric Deposition \| Highway/Road/Bridge Runoff \| Landfills \| Nonpoint Source \| Point Source \| Surface Runoff \| Urban Runoff/Storm Sewers
Expected TMDL Completion Date:	2004
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	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.

Regional Board Decision Recommendation:	No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.

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.

USEPA Action (if applicable):	USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant.

Line of Evidence (LOE) for Decision ID 6593, Zinc	Region 9
Chollas Creek

LOE ID:

3358

Pollutant:

Zinc

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

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: