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

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name:	Little Chico Creek (Butte County)
Water Body ID:	CAR5212001220090330140628
Water Body Type:	River & Stream


DECISION ID	131660	Region 5
Little Chico Creek (Butte County)

Pollutant:	Benthic Community Effects
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Benthic Community Effects are being considered for placement on the CWA section 303(d) List under sections 3.9 of the Listing Policy. Under section 3.9, additional lines of evidence (LOEs) associating the Benthic Community Effects decision with a water or sediment concentration of pollutants other than benthic-macroinvertebrate bioassessment or habitat assessment LOEs are necessary to place a water body on the 303(d) List for Benthic Community Effects. One line of evidence evaluating benthic-macroinvertebrate bioassessment data is available in the administrative record to assess this indicator. Zero of one benthic-macroinvertebrate samples exceed the California Stream Condition Index (CSCI) impairment threshold. These data indicate that the waterbody is likely unimpaired for Benthic Community Effects and therefore no other pollutant LOEs need be associated with this decision at this time. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing Benthic Community Effects in this waterbody segment 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 of one benthic-macroinvertebrate bioassessment samples had CSCI scores below 0.79. Therefore, this water body is not exceeding the water quality threshold for the protection of the COLD beneficial use. The available information indicates that the waterbody/pollutant combination should not be placed on the 303(d) List of impaired waters at this time. 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 not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:

Line of Evidence (LOE) for Decision ID 131660, Benthic Community Effects	Region 5
Little Chico Creek (Butte County)

LOE ID:

232288

Pollutant:

Benthic-Macroinvertebrate Bioassessments

LOE Subgroup:

Population/Community Degradation

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

Benthic macroinvertebrate surveys

Data Used to Assess Water Quality:

Water Board staff assessed data for 521LCCBSR to determine beneficial use support and the results are as follows: 0 of 1 samples exceeded the threshold. CSCI scores were from 1.114509403 to 1.114509403.

Data Reference:

California Stream Condition Index (CSCI) Scores for the 2020 Integrated Report for Region 5.

SWAMP Data:

SWAMP

Water Quality Objective/Criterion:

All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. Region 5 Basin Plan

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins; Fifth Edition. Revised May 2018 (with approved amendments)

Evaluation Guideline:

The California Stream Condition Index (CSCI) is a biological scoring tool that helps aquatic resource managers translate complex data about benthic macroinvertebrates found living in a stream into an overall measure of stream health. The CSCI score is calculated by comparing the expected condition with actual (observed) results (Rehn, A.C. et al., 2015). CSCI scores range from 0 (highly degraded) to greater than 1 (equivalent to reference). CSCI scoring of biological condition are as follows (per the scientific paper supporting the development of the CSCI scoring tool): greater than or equal to 0.92 = likely intact condition, 0.91 to 0.80 = possibly altered condition, 0.79 to 0.63 = likely altered condition, less than or equal to 0.62 = very likely altered condition. Sites with scores below 0.79 are considered to have exceeded the water quality objective for the aquatic life beneficial use.

Guideline Reference:

Bioassessment in complex environments: designing an index for consistent meaning in different settings

Spatial Representation:

Samples were collected from station 521LCCBSR.

Temporal Representation:

Samples were collected from 7/6/2010 to 7/6/2010.

Environmental Conditions:

QAPP Information:

Data collected following SWAMP QA protocols.

QAPP Information Reference(s):

Quality Assurance Program Plans, Quality Assurance Project Plans, and Standard Operating Procedures for the SWAMP program


DECISION ID	131147	Region 5
Little Chico Creek (Butte County)

Pollutant:	Temperature, water
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
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. 6 lines of evidence are available in the administrative record to assess this pollutant. 0 of the 14 samples exceed the OBJECTIVE for COLD, Fish Migration, and Fish Spawning. 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. 0 of the 14 samples exceed the OBJECTIVE for COLD, Fish Migration, and Fish Spawning, 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 decision was made by SWRCB staff

State Board Review of Regional Board Conclusion and Recommendation:

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

Line of Evidence (LOE) for Decision ID 131147, Temperature, water	Region 5
Little Chico Creek (Butte County)

LOE ID:

230654

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed City of Chico LID Project data for Little Chico Creek (Butte County) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the water quality threshold for Temperature.

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The natural receiving water temperature of intrastate waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Water Board that such alteration in temperature does not adversely affect beneficial uses (Sacramento-San Joaquin River Basin Plans.

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131147, Temperature, water	Region 5
Little Chico Creek (Butte County)

LOE ID:

230653

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131147, Temperature, water	Region 5
Little Chico Creek (Butte County)

LOE ID:

230675

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131147, Temperature, water	Region 5
Little Chico Creek (Butte County)

LOE ID:

230655

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131147, Temperature, water	Region 5
Little Chico Creek (Butte County)

LOE ID:

230674

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Spawning

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131147, Temperature, water	Region 5
Little Chico Creek (Butte County)

LOE ID:

230957

Pollutant:

Temperature, water

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Fish Migration

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Inland Fishes of California (Moyle 1976) states that for rainbow trout the optimum range for growth and completion of most life stages is 13-21 degrees C (page 129).

Guideline Reference:

Inland Fishes of California

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program


DECISION ID	131148	Region 5
Little Chico Creek (Butte County)

Pollutant:	Total Dissolved Solids
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	Insufficient information is available to determine beneficial use support for this waterbody-pollutant combination with the statistical power and confidence required by the Listing Policy. Beneficial use support will be reassessed in a future cycle, if more data are available.

Regional Board Decision Recommendation:	This decision was made by SWRCB staff.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because it cannot be determined if applicable water quality standards are not being exceeded.

Line of Evidence (LOE) for Decision ID 131148, Total Dissolved Solids	Region 5
Little Chico Creek (Butte County)

LOE ID:

230858

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary Maximum Contaminant Level for total dissolved solids incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 500 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131148, Total Dissolved Solids	Region 5
Little Chico Creek (Butte County)

LOE ID:

230855

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary Maximum Contaminant Level for total dissolved solids incorporated by reference in the Water Quality Control Plan for the Sacramento and San Joaquin River Basins is 500 mg/L.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program


DECISION ID	131146	Region 5
Little Chico Creek (Butte County)

Pollutant:	pH
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Sources:	A Source Unknown
Expected TMDL Completion Date:	2033
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. 6 lines of evidence are available in the administrative record to assess this pollutant. 12 of the 14 samples exceeded the OBJECTIVE for COLD, REC-1, and REC-2. 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. 12 of the 14 samples exceeded the OBJECTIVE for COLD, REC-1, and REC-2, and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.

Regional Board Decision Recommendation:	This decision was made by SWRCB staff.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB 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.

Line of Evidence (LOE) for Decision ID 131146, pH	Region 5
Little Chico Creek (Butte County)

LOE ID:

228722

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed City of Chico LID Project data for Little Chico Creek (Butte County) to determine beneficial use support and results are as follows: 6 of 7 samples exceeded the water quality threshold for pH.

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131146, pH	Region 5
Little Chico Creek (Butte County)

LOE ID:

228464

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131146, pH	Region 5
Little Chico Creek (Butte County)

LOE ID:

228486

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131146, pH	Region 5
Little Chico Creek (Butte County)

LOE ID:

228778

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131146, pH	Region 5
Little Chico Creek (Butte County)

LOE ID:

228549

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDOutlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program

Line of Evidence (LOE) for Decision ID 131146, pH	Region 5
Little Chico Creek (Butte County)

LOE ID:

228462

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Data Reference:

Field data for the 2020/2022 integrated report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Water Quality Control Plan, Central Valley Region Sacramento River Basin and San Joaquin River Basin: pH should not be lower than 6.5 or higher than 8.5.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site (PR2BSDInlet)

Temporal Representation:

The samples were collected between the dates of 2015-12-03 and 2017-03-21

Environmental Conditions:

QAPP Information:

California Urban Streams Alliance. 2015. Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program.

QAPP Information Reference(s):

Final Quality Assurance Project Plan Version IV 2015-2018 The Stream Team Citizen Monitoring Program


DECISION ID	75230	Region 5
Little Chico Creek (Butte County)

Pollutant:	Mercury
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 3.5 of the Listing Policy. Under section 3.5 a single line of evidence is necessary to assess listing status. One line of evidence are available in the administrative record to assess this pollutant. 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. Zero of 3 samples exceeded the USEPA (CTR) mercury-based numeric criterion for human health 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 cycle. 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 75230, Mercury	Region 5
Little Chico Creek (Butte County)

LOE ID:

28137

Pollutant:

Mercury

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Total

Beneficial Use:

Commercial or recreational collection of fish, shellfish, or organisms

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

A total of 5 water samples were collected at one location from Little Deer Creek representing three 30-day average samples. None of the three 30-day average samples exceeded the USEPA (CTR) mercury-based numeric criterion for human health. The total recoverable mercury concentrations in water ranged from 9.21 ng/l to 21.3 ng/l for the three 30-day average samples.

Data Reference:

Sacramento River Watershed Program Annual Reports for 1999-2000, 2000-2001, 2001-2002, 2002-2003, and 2003-2004; and BDAT data 1998-2003

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The USEPA (CTR) numeric criterion for the protection of human health for the consumption of both water and fish that live in the water is 50 ng/l (30-day average) for total recoverable mercury (40 CFR 131.38).

Objective/Criterion Reference:

Water Quality Control Plan for the California Regional Water Quality Control Board Central Valley Region, Sacramento and San Joaquin River Basins. 4th ed

Objective/Criterion 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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected at one location from Little Chico Creek below the City of Chico.

Temporal Representation:

Water samples were collected during five sampling events from 2/20/2002 to 4/12/2003.

Environmental Conditions:

QAPP Information:

Data quality: Excellent. Quality Control for all of the elements described in section 6.1.4 of the Policy was conducted in accordance with the Sacramento River Watershed Program QAPPs prepared by Larry Walker Associates.

QAPP Information Reference(s):

Quality Assurance Project Plans prepared for Sacramento River Watershed Program