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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)
Water Body ID:	CAR8012100020080715104015
Water Body Type:	River & Stream


DECISION ID	97122	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision:	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)(2016)
Revision Status	Original
Sources:	Agriculture \| Dairies \| Urban Runoff/Storm Sewers
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:	This pollutant is being considered for removal from the CWA section 303(d) List under section 4.2 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status. Five (5) lines of evidence are available in the administrative record to assess this pollutant. One (1) of the four (4) samples exceed the E. coli Single Sample Maximum Objective. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against removing this water segment-pollutant combination from the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Two (2) of the four (4) samples exceeded the E. coli Single Sample Maximum 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 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. The Prado Area Streams Pathogen TMDL was approved by the RWQCB in 2007 and subsequently approved by USEPA on 5/16/07. The original listing was for Chino Creek Reach 1. The Regional Board split reach 1 into reach 1a and 1b via a basin plan amendment. This is a continuation of the original listing for Reach 1.

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:	The Prado Area Streams Pathogen TMDL was approved by the RWQCB in 2007 and subsequently approved by USEPA on 5/16/07. The original listing was for Chino Creek Reach 1. The Regional Board split reach 1 into reach 1a and 1b via a basin plan amendment. This is a continuation of the original listing for Reach 1.

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 97122, Indicator Bacteria	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

6690

Pollutant:

Pathogens

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Water Contact Recreation

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):

Line of Evidence (LOE) for Decision ID 97122, Indicator Bacteria	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81365

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:

One of the four samples 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 samples were collected at station CK-CHINO-03.

Temporal Representation:

The samples were collected once a year in August from 2006 to 2009.

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 97122, Indicator Bacteria	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81363

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:

Four of the four samples 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 samples were collected at station CK-CHINO-03.

Temporal Representation:

The samples were collected once a year in August from 2006 to 2009.

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 97122, Indicator Bacteria	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81364

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:

Two of the four samples 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 samples were collected at station CK-CHINO-03.

Temporal Representation:

The samples were collected once a year in August from 2006 to 2009.

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 97122, Indicator Bacteria	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81367

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 four 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 samples were collected at station CK-CHINO-03.

Temporal Representation:

The samples were collected once a year in August from 2006 to 2009.

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	73388	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Alachlor \| Atrazine \| Azinphos-methyl (Guthion) \| Carbaryl \| Carbofuran \| DDE (Dichlorodiphenyldichloroethylene)
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 (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 two (2) samples exceeded the USEPA National Recommended Ambient Water Quality Criteria Aquatic Life Protection Instantaneous Maximum 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:	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 73388, Multiple Pollutants	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7796

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 2 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 ug/l; atrazine: 1 ug/l ; azinphos methyl: 0.01 ug/l ; carbaryl: 0.02 ug/l ; carbofuran: 0.5 ug/l.

Guideline Reference:

Spatial Representation:

The samples were collected from two locations: Chino C Above Central Ave Near Los Serranos California_USGS NAWQA site and Little Chino C Above Pipeline Ave Near Los Serranos California_USGS NAWQA site

Temporal Representation:

The samples were collected on 8/7/00 and 8/11/00.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because the data came from the Department of Pesticide Regulations.

QAPP Information Reference(s):


DECISION ID	73733	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

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 lines of evidence are available in the administrative record to assess this pollutant. None of the single sample 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 for Aquatic life protection and the California Toxics Rule 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:	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 73733, Multiple Pollutants	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

8376

Pollutant:

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:

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 - 5.09 ppb; copper - 20.55 ppb; lead - 10.32 ppb; nickel - 114.01 ppb; silver - 19.90 ppb; zinc - 262.19 ppb

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 taken in Chino Creek at Pine Avenue

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):

Line of Evidence (LOE) for Decision ID 73733, Multiple Pollutants	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

8297

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:

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 for Aquatic life protection: Aluminum - 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:

Compilation of Water Quality Goals

Spatial Representation:

The sample was collected in Chino Creek at Pine Avenue.

Temporal Representation:

The sample was collected on August 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	93370	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Chloride
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 three (3) 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. One hundred fifty-six (156) of the one hundred eighty-four (184) samples exceed this site specific antidegradation objective, found in Table 4-1 of the Region 8 Basin Plan. While this number of exceedances would normally provide sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List, none of the exceedances would cause an impairment of any of the beneficial uses assigned to this waterbody (REC1, REC2, WARM, WILD, RARE). Table 4-1 of the Region 8 Basin Plan identifies site specific water quality objectives based on historical values of Total Dissolved Solids, Hardness, Sodium, Chloride, Total Inorganic Nitrogen, Sulfate and Chemical Oxygen Demand, that were intended to be protective of the groundwater aquifers underlying those surface waterbodies identified in Table 4-1. Regional Board staff have recognized that the Groundwater Recharge beneficial use is more correctly assessed using actual groundwater data rather than by monitoring surface waters. Region Board Resolution No. R8-2004-0001 deleted the groundwater objectives for individual minerals from the Basin Plan, but not the individual mineral objectives for all surface waters. Therefore, as no designated beneficial uses of this waterbody segment are being impaired by these exceedances, the weight of evidence supports a decision to not list this waterbody 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. One hundred fifty-six (156) of the one hundred eighty-four (184) samples exceed the beneficial use criterion 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. 5. Weight of evidence supports the conclusion that the exceedances are not impairing any designated beneficial uses for this waterbody segment.

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 93370, Chloride	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81362

Pollutant:

Chloride

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

184

Number of Exceedances:

156

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 184 samples collected had 156 exceedences of the site-specific 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:

The site-pecific objective for Chloride at Chino Creek Reach 1B according to table 4-1 of the Santa Ana Basin plan is 75 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from the CK-CHINO-03 station.

Temporal Representation:

Data was collected approximately once a month from February 1994 to August 2009.

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	73633	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Chlorpyrifos \| Dieldrin \| Disulfoton \| Malathion \| Molinate \| Parathion \| 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:	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. Three lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceed the California Department of Fish and Game Criteria, the California Toxics Rule Freshwater aquatic life protection Continuous Concentration 4 day average, or the US EPA National Recommended Water Quality Criteria Aquatic Life Protection Instantaneous Maximum and 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 the samples exceeded the California Department of Fish and Game Criteria, the California Toxics Rule Freshwater aquatic life protection Continuous Concentration 4 day average, or the US EPA National Recommended Water Quality Criteria Aquatic Life Protection Instantaneous Maximum 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:	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 73633, Multiple Pollutants	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7802

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 two 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:

US EPA National Recommended Water Quality Criteria Aquatic Life Protection Instantaneous Max:disulfoton: 0.05 ppb, malathion: 0.01 ppb, simazine: 10 ppb, propachlor: 8 ppb.
California Department of Fish and Game: thiobencarb: 3.1 ppb, molinate: 13 ppb, parathion: 0.08 ppb.

Guideline Reference:

Spatial Representation:

Temporal Representation:

The samples were collected on 8/7/00 and 8/11/00.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it was submitted by the Department of Pesticide Regulation.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 73633, Multiple Pollutants	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7797

Pollutant:

Chlorpyrifos

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 two samples collected, none exceeded the guideline.

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:

California Department of Fish and Game: 0.014 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

Spatial Representation:

Temporal Representation:

The samples were collected on 8/7/00 and 8/11/00.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it came from the Department of Pesticide Regulation.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 73633, Multiple Pollutants	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7803

Pollutant:

Dieldrin

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 two samples none exceeded the criteria.

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:

CTR Freshwater aquatic life protection Cont Conc 4 day ave: Dieldrin - 0.056 ppb

Guideline Reference:

Spatial Representation:

Temporal Representation:

The samples were collected on 8/7/00 and 8/11/00.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it was submitted by the Department of Pesticide Regulation.

QAPP Information Reference(s):


DECISION ID	72969	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

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

Regional Board Conclusion:	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. One (1) 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. One (1) of two (2) samples exceeded the California Department of Fish and Game Criteria 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:	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 72969, Diazinon	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7798

Pollutant:

Diazinon

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 two samples collected, one exceeded the guideline.

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:

California Department of Fish and Game 0.08 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

Spatial Representation:

Temporal Representation:

The samples were collected on 8/7/00 and 8/11/00

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	76158	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Sodium
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 3.2 of the Listing Policy. Under section 3.2 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. Two hundred and seven (207) 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. Two hundred-seven (207) of two hundred sixty-one (261) samples exceeded the Basin Plan Objective and this does exceed the allowable frequency listed in Table 3.2 of the Listing Policy. However, the GWR beneficial use is more correctly assessed using actual groundwater data. The surface water objective for this mineral constituent was tied to groundwater objectives for this constituent that were deleted from the Basin Plan (Resolution No. R8-2004-0001). Stakeholders have indicated their intent to re-visit the appropriateness of the surface water objectives for this and other individual mineral objectives as part of the ongoing TDS/Nitrogen Task Force. 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 76158, Sodium	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7892

Pollutant:

Sodium

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Groundwater Recharge

Number of Samples:

261

Number of Exceedances:

207

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 261 samples collected, 207 exceeded the Basin Plan's Objective.

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan site specific objective: 75 mg/l

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 station at Pine Avenue.

Temporal Representation:

The samples were collected monthly since November 1990 through February 2007

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):


DECISION ID	94157	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Sulfates
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 three (3) 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. One hundred fifty-four (154) of the one hundred eighty-four (184) samples exceed this site specific antidegradation objective, found in Table 4-1 of the Region 8 Basin Plan. While this number of exceedances would normally provide sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List, none of the exceedances would cause an impairment of any of the beneficial uses assigned to this waterbody (REC1, REC2, WARM, WILD, RARE). Table 4-1 of the Region 8 Basin Plan identifies site specific water quality objectives based on historical values of Total Dissolved Solids, Hardness, Sodium, Chloride, Total Inorganic Nitrogen, Sulfate and Chemical Oxygen Demand, that were intended to be protective of the groundwater aquifers underlying those surface waterbodies identified in Table 4-1. Regional Board staff have recognized that the Groundwater Recharge beneficial use is more correctly assessed using actual groundwater data rather than by monitoring surface waters. Region Board Resolution No. R8-2004-0001 deleted the groundwater objectives for individual minerals from the Basin Plan, but not the individual mineral objectives for all surface waters. Therefore, as no designated beneficial uses of this waterbody segment are being impaired by these exceedances, the weight of evidence supports a decision to not list this waterbody 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. One hundred fifty-four (154) of the one hundred eighty-four (184) samples exceed the beneficial use criterion 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. 5. Weight of evidence supports the conclusion that the exceedances are not impairing any designated beneficial uses for this waterbody segment.

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 94157, Sulfates	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81366

Pollutant:

Sulfates

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

184

Number of Exceedances:

154

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 184 samples collected had 154 exceedences of the site-specific 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:

The site-pecific objective for Sulfates at Chino Creek Reach 1B according to table 4-1 of the Santa Ana Basin plan is 60 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from the CK-CHINO-03 station.

Temporal Representation:

Data was collected approximately once a month from February 1994 to August 2009.

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	99412	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Total Dissolved Solids
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 three (3) 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. Seventy nine (79) of the four hundred seventy-two (472) samples exceed this site specific antidegradation objective, found in Table 4-1 of the Region 8 Basin Plan. While this number of exceedances would normally provide sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List, none of the exceedances would cause an impairment of any of the beneficial uses assigned to this waterbody (REC1, REC2, WARM, WILD, RARE). Table 4-1 of the Region 8 Basin Plan identifies site specific water quality objectives based on historical values of Total Dissolved Solids, Hardness, Sodium, Chloride, Total Inorganic Nitrogen, Sulfate and Chemical Oxygen Demand, that were intended to be protective of the groundwater aquifers underlying those surface waterbodies identified in Table 4-1. Regional Board staff have recognized that the Groundwater Recharge beneficial use is more correctly assessed using actual groundwater data rather than by monitoring surface waters. Region Board Resolution No. R8-2004-0001 deleted the groundwater objectives for individual minerals from the Basin Plan, but not the individual mineral objectives for all surface waters. Therefore, as no designated beneficial uses of this waterbody segment are being impaired by these exceedances, the weight of evidence supports a decision to not list this waterbody 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. Seventy nine (79) of the four hundred seventy-two (472) samples exceed the beneficial use criterion 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. 5. Weight of evidence supports the conclusion that the exceedances are not impairing any designated beneficial uses for this waterbody segment.

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 99412, Total Dissolved Solids	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7896

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Groundwater Recharge

Number of Samples:

288

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 288 samples collected 18 exceeded the Basin Plan's objective.

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Objective: TDS - 550 mg/l

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 station at Pine Ave.

Temporal Representation:

The samples were collected several times per month over a period of several years starting with 10/8/1984 through 2/22/2007

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 99412, Total Dissolved Solids	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81368

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total Dissolved

Beneficial Use:

Warm Freshwater Habitat

Number of Samples:

184

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Sixty-one of 184 samples exceeded the 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:

The site-pecific objective for Total Dissolved Solids at Chino Creek Reach 1B according to table 4-1 of the Santa Ana Basin plan is 550 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Data was collected from the CK-CHINO-03 station.

Temporal Representation:

Data was collected approximately once a month from February 1994 to August 2009.

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	77299	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Total Nitrogen as N
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 three (3) 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. Seven (7) of the forty-three (43) samples exceed this site specific antidegradation objective, found in Table 4-1 of the Region 8 Basin Plan. While this number of exceedances would normally provide sufficient justification in favor of placing this water segment-pollutant combination on the CWA section 303(d) List, none of the exceedances would cause an impairment of any of the beneficial uses assigned to this waterbody (REC1, REC2, WARM, WILD, RARE). Table 4-1 of the Region 8 Basin Plan identifies site specific water quality objectives based on historical values of Total Dissolved Solids, Hardness, Sodium, Chloride, Total Inorganic Nitrogen, Sulfate and Chemical Oxygen Demand, that were intended to be protective of the groundwater aquifers underlying those surface waterbodies identified in Table 4-1. Regional Board staff have recognized that the Groundwater Recharge beneficial use is more correctly assessed using actual groundwater data rather than by monitoring surface waters. Region Board Resolution No. R8-2004-0001 deleted the groundwater objectives for individual minerals from the Basin Plan, but not the individual mineral objectives for all surface waters. Therefore, as no designated beneficial uses of this waterbody segment are being impaired by these exceedances, the weight of evidence supports a decision to not list this waterbody 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. Seven (7) of the forty-three (43) samples exceed the beneficial use criterion 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. 5. Weight of evidence supports the conclusion that the exceedances are not impairing any designated beneficial uses for this waterbody segment.

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 77299, Total Nitrogen as N	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7897

Pollutant:

Total Nitrogen as N

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Groundwater Recharge

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Of the 42 samples collected 7 exceeded the objective.

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Objective: Total Inorganic Nitrogen: 8 mg/l

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 station at Pine Ave.

Temporal Representation:

The samples were collected several times per month since 4/6/2006 through 2/22/2007

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 77299, Total Nitrogen as N	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

81369

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:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

The sample did not exceed the Total Nitrogen water quality objective at 8 mg/L. The datum is reported as underneath the quantitation limit. This quantitation limit is less than or equal to the water quality standard, the value will be considered as meeting the water quality standard, objective, criterion, or evaluation guideline.

Data Reference:

Data for Various Pollutants in the Streams of Region 8, 2009.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Table 4-1 of the Santa Ana Basin Plan (1995) states that the water quality objective for Total Nitrogen for Santa Ana River (Reach 3), is 8 mg/L.

Objective/Criterion Reference:

Water Quality Control Plan, Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Sample was collected at 'SMCR8_197, Chino Creek (Reach 1B).

Temporal Representation:

Sample was collected on 6/4/2009.

Environmental Conditions:

QAPP Information:

No quality assurance information was provided.

QAPP Information Reference(s):


DECISION ID	73536	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

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

Regional Board Conclusion:	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 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. 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 forty-two (42) samples exceeded the Basin Plan Objective and this does not exceed 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:	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 73536, pH	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7893

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 42 field measurements taken none exceeded the Basin Plan's Objective

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's 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 field measurements were collected at one station at Pine Ave.

Temporal Representation:

The measurements were taken monthly from 1/18/05 through 2/22/07

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):


DECISION ID	99809	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

Pollutant:	Chemical oxygen demand (COD)
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:	While there was no new data considered in the 2016 Listing Cycle, there were questions raised by stakeholders regarding the appropriateness of the water quality objectives applied and it was pointed out that pre-2003 data no longer represents current conditions. The water quality objective used in the 2010 Line of Evidence was 15 mg/L COD and was identified as protecting the WARM beneficial use. It should be noted that the lower segment of the waterbody (Reach 1A) is 30 mg/L. In 2003, the waterbody was split into two segments and Reach 1A COD water quality objective was set to insure that the discharge into Reach 1A of Santa Ana River flows that were diverted through treatment wetlands would not result in exceedances of the Reach 1A objectives. It is not clear in the Region 8 Basin Plan whether the 15 mg/L objective was intended to be protective of a beneficial use or of ambient water quality conditions (anti-degradation). The doubling of the objective to allow the use of treatment wetlands would indicate anti-degradation. It should also be noted that only 8 of the 99 samples would have exceeded the 30 mg/L objective of Reach 1A, an insufficient exceedance rate to justify a Listing. Further, in 2003, a discharge point for the Inland Empire Utilities Agency RP2 sewage treatment plant was eliminated when the plant was decommissioned. The data in the 2010 Line of Evidence (6 samples) show no exceedances of the 15 mg/L objective after the decommission of RP2. While six data points would be insufficient to delist based on Table 4.2 of the Listing Policy, using Section 4.11 of the Listing Policy (Situation-Specific Weight of Evidence) Regional Board staff find that: the lack of certainty regarding whether exceedance of 15 mg/L COD would impair the WARM beneficial use in Chino Creek Reach 1B; whether exceedance of anti-degradation based objectives are appropriately addressed through the 303(d) Listing process; and, most importantly the decommission of the treatment plant and it's discharge point, sufficiently changes the conditions of Chino Creek Reach 1B to make the use of pre-2003 samples inappropriate for Listing determination, are sufficient to warrant a delisting per Section 4.11 of the Listing Policy. State Water Board staff would like to have more recent data that verifies that discharges are no longer occurring and that COD is no longer an issues prior to delisting. Furthermore, the applicable site specific objective is 15 mg/L as iterated in the Basin Plan for this reach.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:	State Water Board staff would like to have more recent data that verifies that discharges are no longer occurring and that COD is no longer an issues prior to delisting. Furthermore, the applicable site specific objective is 15 mg/L as iterated in the Basin Plan for this reach.

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the following changes to the decision: The water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards for the pollutant are being exceeded.

Line of Evidence (LOE) for Decision ID 99809, Chemical oxygen demand (COD)	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

7891

Pollutant:

Chemical oxygen demand (COD)

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 99 samples collected 81 exceeded the Basin Plan's Objective

Data Reference:

2006 HCMP Database

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Santa Ana Region's Basin Plan Objective - COD: 15 mg/l

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 station at Pine Ave.

Temporal Representation:

The samples were collected monthly since 1990 through 2005.

Environmental Conditions:

QAPP Information:

The data's quality is deemed appropriate because it originated from an NPDES discharger in compliance with their monitoring and reporting program.

QAPP Information Reference(s):


DECISION ID	77154	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

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. 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. This water body's original listing was for Chino Creek Reach 1. The Regional Board, via a basin plan amendment, split reach 1 into reach 1A and 1B. This decision is a continuation of the listing for Chino Creek Reach 1.

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 77154, Nutrients	Region 8
Chino Creek Reach 1B (Mill Creek confl to start of concrete lined channel)

LOE ID:

6692

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:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Unspecified

Temporal Representation:

Unspecified

Environmental Conditions:

Unspecified

QAPP Information:

Unspecified

QAPP Information Reference(s):