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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Mill Creek (Prado Area)
Water Body ID:	CAR8012100019990211144540
Water Body Type:	River & Stream


DECISION ID	76089	Region 8
Mill Creek (Prado Area)

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)(2016)
Revision Status	Original
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier 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 lines 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 one sample exceeded the USEPA National Recommended Ambient Water Quality Criteria and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met. A minimum of 16 samples are needed for application of table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current. 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.

Line of Evidence (LOE) for Decision ID 76089, Multiple Pollutants	Region 8
Mill Creek (Prado Area)

LOE ID:

7817

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:

The only sample collected did not show exceedances of 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, parathion: 0.08 ppb, diazinon: 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:

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

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:

The sample was collected at Mill Creek Near Splatters Duck Club In Prado Wetlands California_USGS NAWQA site

Temporal Representation:

The sample was collected on 8/8/00

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	77534	Region 8
Mill Creek (Prado Area)

Pollutant:	Aluminum \| Cadmium \| Chromium, hexavalent \| Copper \| Lead \| Mercury \| Nickel \| Selenium \| Silver \| Zinc
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:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier 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. Two (2) lines of evidence are available in the administrative record to assess this pollutant. The one sample from each line of evidence that was taken did not 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 one (1) sample exceeded the USEPA National Recommended Ambient Water Quality Criteria for Aquatic life protection and this sample size is insufficient to determine with the power and confidence of the Listing Policy if standards are not met. A minimum of 16 samples are needed for application of table 3.1. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current. 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.

Line of Evidence (LOE) for Decision ID 77534, Multiple Pollutants	Region 8
Mill Creek (Prado Area)

LOE ID:

30526

Pollutant:

Aluminum | Chromium, hexavalent | Mercury | Selenium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The only sample collected did not exceed the guidelines.

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan Objective: Teh 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 for Aquatic life protection - aluminun: 87 ppb, mercury: 0.77 ppb.

CTR Fresh Water Aquatic Life Protection 4 day Average continuous concentration - chromium VI: 11 ppb, selenium: 20 ppb.

Guideline Reference:

Spatial Representation:

The sample was collected at the Mill Creek at Chino sampling station.

Temporal Representation:

The sample was collected on 8/16/2005

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 77534, Multiple Pollutants	Region 8
Mill Creek (Prado Area)

LOE ID:

8377

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Warm Freshwater Habitat

Aquatic Life Use:

Warm Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

None of the samples exceeded the standards

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan 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:

The California Toxics Rule cadmium criteria is hardness dependent and ranged as follows: cadium - 2.95 ppb; copper - 11.37 ppb; lead - 4.27 ppb; nickel - 63.43 ppb; silver - 6.04 ppb; zinc - 145.73 ppb

Guideline Reference:

Spatial Representation:

The sample was taken in Mill Creek near Chino

Temporal Representation:

The sample was taken on 8/16/2005

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):


DECISION ID	77478	Region 8
Mill Creek (Prado Area)

Pollutant:	Nutrients
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:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier Listing Cycle. 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. State Board Review and Conclusion: This Santa Ana Regional Board staff recommended to continue listing this previously listed water body for Nutrients in the centralized database for the assessment. However, the centralized database was not used to generate the final Staff Report for Region 8 and this decision did not get included for Regional Water Board approval. Based on the review of the data and information in the centralized database, State Water Board staff recommends to continue to List this water body-pollutant combination.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current. 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.

Line of Evidence (LOE) for Decision ID 77478, Nutrients	Region 8
Mill Creek (Prado Area)

LOE ID:

4420

Pollutant:

Nutrients

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:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

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	77479	Region 8
Mill Creek (Prado Area)

Pollutant:	Total Suspended Solids (TSS)
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:	2019
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	There was no new data considered in the 2014 Listing Cycle, this previously made decision will carryover. The following description applies to an earlier Listing Cycle. 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. State Board Review and Conclusion: This Santa Ana Regional Board staff recommended to continue listing this previously listed water body for Total Suspended Solids (TSS) in the centralized database for the assessment. However, the centralized database was not used to generate the final Staff Report for Region 8 and this decision did not get included for Regional Water Board approval. Based on the review of the data and information in the centralized database, State Water Board staff recommends to continue to List this water body-pollutant combination.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current. 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.

Line of Evidence (LOE) for Decision ID 77479, Total Suspended Solids (TSS)	Region 8
Mill Creek (Prado Area)

LOE ID:

4421

Pollutant:

Total Suspended Solids (TSS)

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:

Placeholder reference pre-2006 303(d)

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Unspecified

Objective/Criterion Reference:

Placeholder reference pre-2006 303(d)

Evaluation Guideline:

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	70380	Region 8
Mill Creek (Prado Area)

Pollutant:	Indicator Bacteria
Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (being addressed by USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Dairies
TMDL Name:	Prado Area Streams Pathogen TMDL
TMDL Project Code:	90
Date TMDL Approved by USEPA:	05/16/2007
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	No new data were assessed this cycle. The decision has not changed, and is presented in "Decision Relationships Continued". From 2010 Listing Cycle: Regional Board Conclusion: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Prado Area Streams Pathogen TMDL was approved by the RWQCB in 2007 and subsequently approved by USEPA on 5/16/07. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. State Board Review and Conclusion: This Santa Ana Regional Board staff recommended to continue listing this previously listed water body for Pathogens in the centralized database for the assessment. However, the centralized database was not used to generate the final Staff Report for Region 8 and this decision did not get included for Regional Water Board approval. Based on the review of the data and information in the centralized database, State Water Board staff recommends to continue to List this water body-pollutant combination.

Regional Board Decision Recommendation:	This is a decision previously approved by the State Water Resources Control Board and the USEPA. No new data were assessed by the Regional Board for the current. The decision has not changed.

State Board Review of Regional Board Conclusion and Recommendation:	From 2010 Listing Cycle: Regional Board Conclusion: This pollutant is being considered for listing under section 2.2 of the Listing Policy. Under this section of the Policy, a minimum of one line of evidence is needed to assess listing status. The Prado Area Streams Pathogen TMDL was approved by the RWQCB in 2007 and subsequently approved by USEPA on 5/16/07. Based on the readily available information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination in the Water Quality Limited Segments Being Addressed portion of the section 303(d) list. State Board Review and Conclusion: This Santa Ana Regional Board staff recommended to continue listing this previously listed water body for Pathogens in the centralized database for the assessment. However, the centralized database was not used to generate the final Staff Report for Region 8 and this decision did not get included for Regional Water Board approval. Based on the review of the data and information in the centralized database, State Water Board staff recommends to continue to List this water body-pollutant combination.

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 70380, Indicator Bacteria	Region 8
Mill Creek (Prado Area)

LOE ID:

2992

Pollutant:

Pathogens

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic 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 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):