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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Prado Basin Management Zone
Water Body ID:	CAW8012100019991014103600
Water Body Type:	Wetland, Freshwater


DECISION ID	100439	Region 8
Prado Basin Management Zone

Pollutant:	Indicator Bacteria
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. Six (6) lines of evidence are available in the administrative record to assess this pollutant. Zero (0) of 0 samples exceed the E. coli Geomean Objective. One (1) of 1 sample exceeds the E. coli Single Sample 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 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 (0) of the 0 samples exceed the E. coli Geomean Objective, 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 5 samples is needed to determine if a beneficial use is fully supported using Table 3.2. 4. One (1) of the 1 sample exceeds the E. coli Single Sample Objective, 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 5 samples is needed to determine if a beneficial use is fully supported using Table 3.2. 5. 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 100439, Indicator Bacteria	Region 8
Prado Basin Management Zone

LOE ID:

95683

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:

Not Specified

Data Used to Assess Water Quality:

The one sample exceeded the entercoccus guideline.

Data Reference:

Data for Metals and Other Inorganic Pollutants in Orange County Water District, 1994-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Water Quality Control Plan for the Santa Ana River Basin.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The single sample entercoccus concentration shall not exceed more than 61/100ml. USEPA Ambient Water Quality Criteria for Bacteria 1986.

Guideline Reference:

Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002

Spatial Representation:

The sample was collected at station CK-TEMESCAL-02.

Temporal Representation:

The sample was collected in August from 2008.

Environmental Conditions:

QAPP Information:

The samples were collected under the Orange County Water District Main Laboratory Quality Assurance Manual. November 2009.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 100439, Indicator Bacteria	Region 8
Prado Basin Management Zone

LOE ID:

95684

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

The one sample exceeded the E. coli guideline.

Data Reference:

Data for Metals and Other Inorganic Pollutants in Orange County Water District, 1994-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Water Quality Control Plan for the Santa Ana River Basin.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The single sample E. coli concentration shall not exceed more than 235/100ml. USEPA Ambient Water Quality Criteria for Bacteria 1986.

Guideline Reference:

Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002

Spatial Representation:

The sample was collected at station CK-TEMESCAL-02.

Temporal Representation:

The sample was collected in August from 2008.

Environmental Conditions:

QAPP Information:

The samples were collected under the Orange County Water District Main Laboratory Quality Assurance Manual. November 2009.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 100439, Indicator Bacteria	Region 8
Prado Basin Management Zone

LOE ID:

95685

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:

Not Specified

Data Used to Assess Water Quality:

The one sample exceeded the fecal coliform objectve.

Data Reference:

Data for Metals and Other Inorganic Pollutants in Orange County Water District, 1994-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The fecal coliform concentration shall not exceed more than 400/100 ml. Water Quality Control Plan for the Santa Ana River Basin.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The sample was collected at station CK-TEMESCAL-02.

Temporal Representation:

The sample was collected in August 2008.

Environmental Conditions:

QAPP Information:

The samples were collected under the Orange County Water District Main Laboratory Quality Assurance Manual. November 2009.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 100439, Indicator Bacteria	Region 8
Prado Basin Management Zone

LOE ID:

95686

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:

Not Specified

Data Used to Assess Water Quality:

None of the samples exceeded the total coliform guideline.

Data Reference:

Data for Metals and Other Inorganic Pollutants in Orange County Water District, 1994-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The concentrations of toxic pollutants in the water column, sediments or biota shall not adversely affect beneficial uses. Water Quality Control Plan for the Santa Ana River Basin.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

The single sample total coliform concentration shall not exceed more than 10,000/100ml. Guidance for Fresh Water Beaches (CDPH 2011).

Guideline Reference:

Draft Guidance for Fresh Water Beaches. Last Update: May 8, 2006. Initial Draft: November 1997. California Department of Public Health.

Spatial Representation:

The sample was collected at station CK-TEMESCAL-02.

Temporal Representation:

The sample was collected in August from 2008.

Environmental Conditions:

QAPP Information:

The samples were collected under the Orange County Water District Main Laboratory Quality Assurance Manual. November 2009.

QAPP Information Reference(s):


DECISION ID	80650	Region 8
Prado Basin Management Zone

Pollutant:	pH
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:	2027
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. Sixty-three (63) of seventy-six (76) samples exceed the Basin Plan Objective. 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. Sixty-three (63) of seventy-six (76) samples exceed the Basin Plan Objective and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

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 80650, pH	Region 8
Prado Basin Management Zone

LOE ID:

95687

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 76 samples, 63 exceeded the Basin Plan's objective.

This LOE is replacing LOE 8280 which was moved from Temescal Creek Reach 1 because of a mapping change. Temescal Creek Reach 1 was shortened and split into Reach's 1a and 1b. Prado Flood Control Basin was expanded and its name was changed to Prado Basin Management Zone.

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana River Basin Plan Objective: 6.5 - 8.5 pH units

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at one location in Temescal Creek above Main at Corona.

Temporal Representation:

The samples were collected multiple times per month over several years beginning with 7/7/2003 through 2/21/2007.

Environmental Conditions:

QAPP Information:

The data's quality is deemed acceptable because it was submitted by an NPDES discharger in accordance with its Monitoring and Reporting Requirements.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 80650, pH	Region 8
Prado Basin Management Zone

LOE ID:

95956

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

162

Number of Exceedances:

Data and Information Type:

Not Specified

Data Used to Assess Water Quality:

Fourty-seven of the 162 samples exceeded the pH objective.

Data Reference:

Data for Metals and Other Inorganic Pollutants in Orange County Water District, 1994-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana River Basin Plan Objective: 6.5 - 8.5 pH units

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Ambient Water Quality Criteria for Bacteria - 1986. EPA440/5-84-002

Spatial Representation:

The sample was collected at station CK-TEMESCAL-02.

Temporal Representation:

The samples were collected between 2/15/1994 and 8/19/2008

Environmental Conditions:

QAPP Information:

The samples were collected under the Orange County Water District Main Laboratory Quality Assurance Manual. November 2009.

QAPP Information Reference(s):