Final California 2012 Integrated Report( 303(d) List/305(b) Report)

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name: Santa Ana River, Reach 2
Water Body ID: CAR8011300019991014130438
Water Body Type: River & Stream
 
DECISION ID
25228
Region 8     
Santa Ana River, Reach 2
 
Pollutant: Alachlor | Atrazine | Azinphos-methyl (Guthion) | Carbaryl | Carbofuran | Chlorpyrifos | DDE (Dichlorodiphenyldichloroethylene) | Diazinon | Dieldrin | Disulfoton | Malathion | Methyl Parathion | Molinate | Simazine | Thiobencarb/Bolero
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)(2010)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One (1) line of evidence is available in the administrative record to assess this pollutant. None of the samples exceed the water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. None of twenty (20) samples exceeded the US EPA National Recommended Ambient Water Quality Criteria Aquatic Life Protection Instantaneous Max, theUS EPA National Recommended Ambient Water Quality Criteria Aquatic Life Protection Cont Conc 4 day average or the California Toxics Rule Freshwater aquatic life protection Cont Conc 4 day average and this does not exceed 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: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.
 
State Board Staff Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards for the pollutant are not exceeded.
 
 
Line of Evidence (LOE) for Decision ID 25228, Multiple Pollutants
Region 8     
Santa Ana River, Reach 2
 
LOE ID: 7823
 
Pollutant: Alachlor | Atrazine | Azinphos-methyl (Guthion) | Carbaryl | Carbofuran | Chlorpyrifos | DDE (Dichlorodiphenyldichloroethylene) | Diazinon | Dieldrin | Disulfoton | Malathion | Methyl Parathion | Molinate | Simazine | Thiobencarb/Bolero
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 20
Number of Exceedances: 0
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Of the 20 samples collected none exceeded the guidelines.
Data Reference: Concentrations of Pesticides in the waterbodies in the Santa Ana Region
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Santa Ana Region’s Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the Santa Ana River Basin
 
Evaluation Guideline: USEPA National Recommended Ambient Water Quality Criteria Aquatic Life Protection Instantaneous Max - alachlor: 76 ppb, atrazine: 1 ppb, azinphos methyl: 0.01 ppb, carbaryl: 0.02 ppb, carbofuran: 0.5 ppb, disulfoton: 0.05 ppb, malathion: 0.01 ppb. California Department of Fish and Game: chlropyrifos: 0.014 ppb, diazinon: 0.08 ppb, parathion: 0.08 ppb, molinate: 13 ppb, permethrin: 0.03 ppb, thiobencarb: 3.1 ppb. USEPA National Recommended Ambient Water Quality Criteria Aquatic Life Protection Cont Conc 4 day ave: DDE: 0.001 ppb. CTR Freshwater aquatic life protection Cont Conc 4 day ave - dieldrin: 0.056 ppb
Guideline Reference: National recommended water quality criteria: 2002. EPA-822-R-02-047 Washington, D.C. USEPA
  Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Spatial Representation: The sample was collected at Santa Ana River Below Imperial Hwy Near Anaheim_USGS NAWQA site
Temporal Representation: The samples were collected on: 1/13/00, 1/25/00, 2/1/00, 2/12/00, 2/18/00, 2/23/00, 2/29/00, 3/17/00, 3/31/00, 4/13/00, 5/12/00, 6/15/00, 7/14/00, 8/17/00, 9/13/00, 10/19/00, 12/13/00, 1/18/01, 2/21/01, 4/19/01.
Environmental Conditions:
QAPP Information: The data's quality is deemed appropriate because it came from the Department of Pesticide Regulation.
QAPP Information Reference(s):
 
 
DECISION ID
30317
Region 8     
Santa Ana River, Reach 2
 
Pollutant: Cadmium
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)(2010)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

State Board Review and Conclusion:
The April 19, 2010 State Water Board staff report for the 2010 Integrated Report recommended to place this water body on the 303(d) list for cadmium based on the evaluation of existing data.

State Water Board staff evaluated the cadmium data using a default CTR translator to translate the data from total recoverable to dissolved for comparison to the California Toxics Rule (CTR) criteria for cadmium.

This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant with the CTR chronic criteria. Four of 35 samples exceed the CTR criteria.

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. Four of 35 samples exceed the California Toxics Rule chronic criteria 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.

At the June 15, 2010 State Water Board meeting for approval of the 2010 Integrated Report, the State Water Board directed staff to reevaluate the listing recommendation for this water body-pollutant combination. Based on this reevaluation, State Water Board staff continued to recommend to place this water body on the 303(d) list for cadmium.

At the August 4, 2010 State Water Board's follow-up Board meeting for approval of the 2010 Integrated Report, the State Water Board did not approve the State Water Board staff recommendation and instead recommended to not place this water body on the 303(d) list for cadmium.
 
Regional Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
 
State Board Staff Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

The State Water Board recommends that this water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 30317, Cadmium
Region 8     
Santa Ana River, Reach 2
 
LOE ID: 31363
 
Pollutant: Cadmium
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 35
Number of Exceedances: 4
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Four of 35 samples exceed the CTR chronic criterion. Total metals data were converted to compare with dissolved metals criteria.
Data Reference: 2006 HCMP Database
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the Santa Ana River Basin
 
Evaluation Guideline: California Toxics Rule Criterion Continuous Concentration (CCC) for freshwater aquatic life for cadmium. Numeric criterion varies with hardness.
Guideline Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Spatial Representation: Samples were collected at Santa Ana River below Prado Dam.
Temporal Representation: Samples were collected from 7/30/1972 to 8/16/2005.
Environmental Conditions:
QAPP Information: Data originated from an NPDES discharger in compliance with their monitoring and reporting program requirements.
QAPP Information Reference(s):
 
 
DECISION ID
29691
Region 8     
Santa Ana River, Reach 2
 
Pollutant: Copper
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)(2010)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

State Board Review and Conclusion:
The April 19, 2010 State Water Board staff report for the 2010 Integrated Report recommended to place this water body on the 303(d) list for copper based on the evaluation of existing data. State Water Board staff evaluated the copper data using a default CTR translator to translate the data from total recoverable to dissolved for comparison to the California Toxics Rule (CTR) criteria for copper.

This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant with the CTR chronic criteria. Twenty-nine of 57 samples exceed the CTR criteria.

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. Twenty-nine of 57 samples exceed the California Toxics Rule chronic criteria 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.

At the June 15, 2010 State Water Board meeting for approval of the 2010 Integrated Report, the State Water Board directed staff to reevaluate the listing recommendation for this water body-pollutant combination. Based on this reevaluation, State Water Board staff continued to recommend to place this water body on the 303(d) list for copper.

At the August 4, 2010 State Water Board's follow-up Board meeting for approval of the 2010 Integrated Report, the State Water Board did not approve the State Water Board staff recommendation and instead recommended to not place this water body on the 303(d) list for copper.
 
Regional Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
 
State Board Staff Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

The State Water Board recommends that this water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 29691, Copper
Region 8     
Santa Ana River, Reach 2
 
LOE ID: 31364
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 57
Number of Exceedances: 29
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Sixty-four samples were collected for this data set. However, only 57 samples have results above the criterion or non-detect results with sample detection limits below the criterion. Twenty-nine of 57 samples exceed the CTR chronic criterion. Total metals data were converted to compare with dissolved metals criteria.
Data Reference: 2006 HCMP Database
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the Santa Ana River Basin
 
Evaluation Guideline: California Toxics Rule Criterion Continuous Concentration (CCC) for freshwater aquatic life for copper. Numeric criterion varies with hardness.
Guideline Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Spatial Representation: Samples were collected at Santa Ana River below Prado Dam.
Temporal Representation: Samples were collected from 7/30/1972 to 8/16/2005.
Environmental Conditions:
QAPP Information: Data originated from an NPDES discharger in compliance with their monitoring and reporting program requirements.
QAPP Information Reference(s):
 
 
DECISION ID
29831
Region 8     
Santa Ana River, Reach 2
 
Pollutant: Lead
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)(2010)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

State Board Review and Conclusion:
The April 19, 2010 State Water Board staff report for the 2010 Integrated Report recommended to place this water body on the 303(d) list for lead based on the evaluation of existing data. State Water Board staff evaluated the lead data using a default CTR translator to translate the data from total recoverable to dissolved for comparison to the California Toxics Rule (CTR) criteria for lead.

This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

One line of evidence is available in the administrative record to assess this pollutant with the CTR chronic criteria. Six of 18 samples exceed the CTR criteria.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. Six of 18 samples exceed the California Toxics Rule chronic criteria 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.

At the June 15, 2010 State Water Board meeting for approval of the 2010 Integrated Report, the State Water Board directed staff to reevaluate the listing recommendation for this water body-pollutant combination. Based on this reevaluation, State Water Board staff continued to recommend to place this water body on the 303(d) list for lead.

At the August 4, 2010 State Water Board's follow-up Board meeting for approval of the 2010 Integrated Report, the State Water Board did not approve the State Water Board staff recommendation and instead recommended to not place this water body on the 303(d) list for lead..
 
Regional Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
 
State Board Staff Review of Regional Board Conclusion and Recommendation:
 
State Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

The State Water Board recommends that this water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are being exceeded.
 
 
Line of Evidence (LOE) for Decision ID 29831, Lead
Region 8     
Santa Ana River, Reach 2
 
LOE ID: 31365
 
Pollutant: Lead
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Warm Freshwater Habitat
 
Number of Samples: 18
Number of Exceedances: 6
 
Data and Information Type: PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: Six of 18 samples exceed the CTR chronic criterion. Total metals data were converted to compare with dissolved metals criteria.
Data Reference: 2006 HCMP Database
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect beneficial uses.
Objective/Criterion Reference: Water Quality Control Plan for the Santa Ana River Basin
 
Evaluation Guideline: California Toxics Rule Criterion Continuous Concentration (CCC) for freshwater aquatic life for lead. Numeric criterion varies with hardness.
Guideline Reference: Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency
 
Spatial Representation: Samples were collected at Santa Ana River below Prado Dam.
Temporal Representation: Samples were collected from 1/24/1978 to 8/16/2005.
Environmental Conditions:
QAPP Information: Data originated from an NPDES discharger in compliance with their monitoring and reporting program requirements.
QAPP Information Reference(s):
 
 
DECISION ID
29936
Region 8     
Santa Ana River, Reach 2
 
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)(2010)
Revision Status Original
Sources: Source Unknown
Expected TMDL Completion Date: 2021
Impairment from Pollutant or Pollution: Pollutant
 
Regional Board Conclusion: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.

USEPA Final Approval Decision Details:

The November 12, 2010 USEPA partial approval letter and the October 11, 2011 final approval letter both from Alexis Strauss, USEPA Region 9, to Tom Howard, SWRCB, concluded the following:

USEPA added Santa Ana River, Reach 2 to the list of water quality limited segments requiring a TMDL for indicator bacteria. This water body is designated as a Water Contact Recreation (REC1) water body either explicitly or implicitly as tributaries to other designated segments (RWQCB Santa Ana Region, 2008, Table 3-1, pp.3-23 - 3-35).

The Santa Ana Basin Plan has the following water quality objective for fecal coliform to protect REC1 beneficial use:

Fecal coliform: log mean less than 200 organisms/100 mL based on five or more samples/30 day period, and not more than 10% of the samples exceed 400 organisms/100 mL for any 30-day period. (RWQCB Santa Ana Region, 2008, pp.4-9)

Recent monitoring data collected in this water body measures Escherichia coli (E. coli) indicator bacteria. E. coli is one species within the broader category of fecal coliform bacteria and monitoring data for E. coli can be used to evaluate whether the fecal coliform objective is being met in the subject water body. In addition,

USEPA has recommended that California use USEPA's Ambient Water Quality Criteria for Bacteria (1986) when there is no adopted E. coli standard. Specifically, USEPA recommends that for REC1 beneficial use the following criteria be used:
Steady state geometric mean indicator density - 126 indicator densities/100ml Designated beach area (upper 75% confidence limit) - 235 indicator densities/100ml (EPA, 1986, Table 4, pp.15)

USEPA compared the E. coli data for subject water bodies to the Basin Plan's fecal coliform objective, as well as to USEPA's recommended E. coli criteria and the results were:

1. Thirty-seven of the 150 samples taken exceeded the USEPA E. coli criteria (235 organisms/100ml).
2. Twenty-seven of the 150 samples taken exceeded the Basin Plan objective for fecal coliform (400 organisms/100ml).

For this water body segment, sufficient exceedances of the fecal coliform objective and the USEPA recommended criteria exist to merit listings per the 10% exceedance threshold for conventional pollutants expressed in Table 3.2 of the State Listing Policy.

For historical clarification, the Regional and State Water Board detailed decision recommendations made prior to USEPA's final decision are presented in their respective recommendation fields in this decision.

Note: All lines of evidence (LOEs) previously made by the Regional Boards have been revised where necessary in accordance with USEPA's final decision.
 
Regional Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
 
State Board Staff Review of Regional Board Conclusion and Recommendation: For historical clarification, the Regional and State Water Board detailed decision recommendations made prior to USEPA's final decision are presented in their respective recommendation fields in this decision.

Note: All lines of evidence (LOEs) previously made by the Regional Boards have been revised where necessary in accordance with USEPA's final decision.
 
State Board Decision Recommendation: Region 8 data was not included in the 2012 Integrated Report so all decisions are carried over from the 2010 listing cycle.
 
 
Line of Evidence (LOE) for Decision ID 29936, Indicator Bacteria
Region 8     
Santa Ana River, Reach 2
 
LOE ID: 26082
 
Pollutant: Escherichia coli (E. coli)
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Water Contact Recreation
 
Number of Samples: 150
Number of Exceedances: 37
 
Data and Information Type: PATHOGEN MONITORING
Data Used to Assess Water Quality: Of the 150 samples taken by Orange County Coast Keeper Coastal Watersheds Project, 37 exceeded USEPA's recommended single sample standard and 27 samples exceeded the Basin Plan fecal coliform objective. These data was obtained by the Orange County Coast Keeper through a Clean Water Act Section 319 (h) Grant.
Data Reference: Orange County Coast Keeper Coastal Watersheds Project
  USEPA Partial Approval Disapproval Letter and enclosures for California's 2008-2010 303(d) List
  USEPA Final Decision Letter with enclosures and responsiveness summary regarding waters added to California's 2008-2010 303(d) List
  USEPA Region 9 data summary for addition of indicator bacteria to California 2010 303(d) list for some Santa Ana River - Region 8 water bodies
 
SWAMP Data: Non-SWAMP
 
Water Quality Objective/Criterion: USEPA Recommended Ambient Water Quality Criteria for Bacteria -1986: E. coli: log mean less than 126 organisms/100 mL based on five or more samples per 30-day period, and single sample shall not exceed 235 organisms/100mL.

Santa Ana Region Basin Plan objective for Fecal coliform: log mean less than 200 organisms/100 mL based on five or more samples/30 day period, and not more than 10% of the samples exceed 400 organisms/100 mL for any 30-day period. (RWQCB Santa Ana Region, 2008, pp.4-9)
Objective/Criterion Reference: Water Quality Control Plan for the Santa Ana River Basin
  Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: The samples were collected at six stations in the Santa Ana River (SAR1, SAR2, SAR3, SAR4, SAR5, SAR6).
These stations are located as follows:
SAR1 - Green River: This site is located off of 91 freeway at the Green River exit under the bridge at the Green River Golf Course.
SAR2- Gypsum Canyon: This site is located off of Gypsum Canyon Rd. and Yorba Linda Boulevard, across the street from the "Fantasy Restaurant."
SAR3 - The Yorba Linda Park: This site is located on the Santa Ana River east of Lakeview Street off of the 91 freeway.
SAR4 - Lakeview: This site is located off the 91 freeways and Lakeview street across from Kaiser Permanente, on the south east bank of the river, next to the bridge.
SAR5 - Lincoln: The Lincoln site is located off the 57 Freeway North before it meets the 91 freeway off of Lincoln street on the north east corner of the bridge.
SAR6 - Katella: This site is located off the 57 freeway N at the Katella exit, across the street from the Anaheim Pond Sports arena.
Temporal Representation: These samples were collected weekly as follows: 28-Oct-02
24-Nov-02, 17-Dec-02, 28-Dec-02, 7-Jan-03, 22-Jan-03, 5-Feb-03, 18-Feb-03, 6-Mar-03, 21-Mar-03, 8-Apr-03, 6-May-03, 5-Jun-03, 8-Jul-03, 6-Aug-03, 2-Sep-03, 20-Oct-03, 18-Nov-03, 5-Dec-03, 9-Dec-03, 7-Jan-04, 20-Jan-04, 3-Feb-04, 17-Feb-04, 3-Mar-04, 17-Mar-04, 6-Apr-04, 4-May-04, 10-Jun-04
Environmental Conditions: Staff is not aware of any special conditions that might effect interpretation of the data.
QAPP Information: The data's quality is deemed appropriate because it was obtained under the auspices of a QAPP approved by the Regional Board.
QAPP Information Reference(s):