Draft California 2024 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name:	Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)
Water Body ID:	CAR5172001120110825140557
Water Body Type:	River & Stream


DECISION ID	148748	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

Pollutant:	Indicator Bacteria
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)(2018)
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. The one historic line of evidence was evaluated and was not used to assess water quality standards attainment because it does not meet the temporal representation requirements of section 6.1.5.3 of the Listing Policy.

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 148748, Indicator Bacteria	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

LOE ID:

59248

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:

Zero of the fifty-two samples exceeded the E. coli objective.

Data Reference:

Data for Mercury over dams at Lake Wildwood in Deer Creek watershed and Benthic Macro-Invertebrate (BMI) samples, 2000-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses. (Water Quality Control Plan, Central Valley Region, Sacramento River and San Joaquin River Basins)

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

Evaluation Guideline:

The E. coli concentration shall not exceed more than 235/100 ml. 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 Friends of Deer Creek monitoring site 1.

Temporal Representation:

The samples were collcted from May 2005 to December 2010.

Environmental Conditions:

QAPP Information:

The data was collected under the Water Monitoring Quality Asurance Project Plan for the Yuba Watershed Council Monitoring Committee. June 2008.

QAPP Information Reference(s):

Quality Assurance Project Plan for the Yuba Watershed Council Monitoring Committee, Revision 1.3.

Line of Evidence (LOE) for Decision ID 148748, Indicator Bacteria	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

LOE ID:

301126

Pollutant:

Escherichia coli (E. coli)

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

STV

Beneficial Use:

Water Contact Recreation

Number of Samples:

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Deer Creek Citizen Monitoring Program data for Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks) to determine beneficial use support and the results are as follows: 0 of the 17 samples exceeded the Statistical Threshold Value (STV) water quality threshold for E. coli. The STV is based on a 10% exceedance rate that is calculated monthly.

Data Reference:

WQ data from the California Environmental Data Exchange Network assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The bacteria water quality objective applicable to all waters, except Lake Tahoe, where the salinity is less than 10 parts per thousand (ppth) 95 percent or more of the time is a STATISTICAL THRESHOLD VALUE (STV) of 320 cfu/100 mL not to be exceeded more than 10 percent of the time (calculated monthly).

Objective/Criterion Reference:

Inland Surface Waters, Enclosed Bays, and Estuaries Plan. Part 1: Trash Provisions; Part 2: Tribal Subsistence Beneficial Uses and Mercury Provisions; Part 3: Bacteria Provisions and Variance Policy

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site(s), station(s): 517DC1NSF (Deer Creek Monitoring Site 1).

Temporal Representation:

The samples were collected between the days of 2017-01-01 and 2019-06-13 .

Environmental Conditions:

QAPP Information:

American Rivers. 2013. QAPP for Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Watershed Council Monitoring Committee.

QAPP Information Reference(s):

QAPP for Water Monitoring Quality Assurance Project Plan for the Yuba/Bear Watershed Council Monitoring Committee


DECISION ID	88800	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

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

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Zero of the 103 samples exceed the water quality objective for COLD. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the CWA section 303(d) List. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of the 103 samples exceed the water quality objective for COLD 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:	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:	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 88800, Oxygen, Dissolved	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

LOE ID:

62183

Pollutant:

Oxygen, Dissolved

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

103

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 103 samples collected had no exceedences.

Data Reference:

Data for Mercury over dams at Lake Wildwood in Deer Creek watershed and Benthic Macro-Invertebrate (BMI) samples, 2000-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The dissolved oxygen concentrations shall not be reduced below the following minimum levels at any time: Waters designated COLD 7.0 mg/l

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the 517DC1xxx station.

Temporal Representation:

Samples were collected approximately once a month between December 2000 to May 2010

Environmental Conditions:

QAPP Information:

The data was collected under the Water Monitoring Quality Assurance Project Plan for the Yuba Watershed Council Monitoring Committee. June 2008.

QAPP Information Reference(s):


DECISION ID	88877	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

Pollutant:	pH
Final Listing Decision:	List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	List on 303(d) list (TMDL required list)(2016)
Revision Status	Original
Sources:	A Source Unknown
Expected TMDL Completion Date:	2027
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 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. Forty-five of the 111 samples exceed the water quality objective for COLD. 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. Forty-five of the 111 samples exceed the water quality objective for COLD 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:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.

Line of Evidence (LOE) for Decision ID 88877, pH	Region 5
Deer Creek (Nevada County, Above Scotts Flat Reservoir to the Confluence of Deer Creek North and South Forks)

LOE ID:

62184

Pollutant:

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Cold Freshwater Habitat

Number of Samples:

111

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Numeric data generated from 111 samples collected had 45 exceedences.

Data Reference:

Data for Mercury over dams at Lake Wildwood in Deer Creek watershed and Benthic Macro-Invertebrate (BMI) samples, 2000-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The pH shall not be depressed below 6.5 nor raised above 8.5.

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

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

Samples were collected from the 517DC1xxx station.

Temporal Representation:

Samples were collected approximately once a month from December 2000 to May 2010.

Environmental Conditions:

QAPP Information:

SWAMP QAPP

QAPP Information Reference(s):