Final California 2018 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name:	Bourland Creek (Tuolumne County)
Water Body ID:	CAR5364002320101020160322
Water Body Type:	River & Stream


DECISION ID	85962	Region 5
Bourland Creek (Tuolumne County)

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

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Six lines of evidence are available in the administrative record to assess this pollutant. Zero of 11 samples and zero of 5 calculated geometric means exceed the evaluation guideline for Escherichia coli (E. coli). Zero of 11 samples and zero of 5 calculated geometric means exceed the water quality objective for fecal coliform. 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 11 samples and zero of 5 calculated geometric means exceed the evaluation guideline for Escherichia coli (E. coli). Zero of 11 samples and zero of 5 calculated geometric means exceed the water quality objective for fecal coliform. 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 26 samples is needed to determine if a beneficial use is fully supported using table 3.2. 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. 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 85962, Indicator Bacteria	Region 5
Bourland Creek (Tuolumne County)

LOE ID:

77242

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 geometric means were calculated from 6 samples. Each geomean was calculated from 5 samples. Zero of 2 calculcated geometric means exceeded the evaluation guideline for E. coli

Data Reference:

Bacteria Contamination, Violations, and Field Data for Stanislaus, 2009-2010.

SWAMP Data:

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 geometric mean of E. coli densities should not exceed 126/100 mL (USEPA 1986).

Guideline Reference:

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

Spatial Representation:

Samples were collected below Bourland Meadow from Bourland Creek.

Temporal Representation:

Six water quality samples were taken between July 14, 2009 and August 28, 2009. Flows at the original sample site below Bourland Meadow had receded by July 24, 2009; on that date the sample site was moved a short distance downstream to a new location on Bourland Creek that had adequate flows for sampling.

Environmental Conditions:

Bourland Meadow lies within a designated research natural area where grazing is prohibited. This site was not grazed and served as the control site. The elevation of this sample location is 7,299 ft.

QAPP Information:

Samples were collected, processed, and analyzed in accordance with the methods described in ¿Surface Water Ambient Monitoring Project in the Santislaus National Forest - Quality Assurance Project Plan ¿

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest by Central Sierra Environmental Resource Center.

Line of Evidence (LOE) for Decision ID 85962, Indicator Bacteria	Region 5
Bourland Creek (Tuolumne County)

LOE ID:

60672

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:

Zero of the 11 samples exceeded the fecal coliform objective.

Data Reference:

Data for Fecal Col, E.coli, and Observations in Region 5 for Various Water Bodies, 2010.

Bacteria Contamination, Violations, and Field Data for Stanislaus, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

In waters designated for contact recreation (REC-1), the fecal coliform concentration shall not exceed 400/100ml.

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:

The samples were collected from Bourland Creek.

Temporal Representation:

Samples were collected form July to August of 2009 and June to August of 2010. CAR5364002320101020160322

Environmental Conditions:

Samples were collected from a natural meadow that was not grazed.

QAPP Information:

Samples were collected under the Surface Water Ambient Monitoring Project in the Stanislaus National Forest Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest by Central Sierra Environmental Resource Center.

Line of Evidence (LOE) for Decision ID 85962, Indicator Bacteria	Region 5
Bourland Creek (Tuolumne County)

LOE ID:

77271

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:

Two geometric means were calculated from 6 samples. Each geomean was calculated from 5 samples. Zero of 2 calculcated geometric means exceeded the water quality objective for fecal coliform.

Data Reference:

Data for Fecal Col, E.coli, and Observations in Region 5 for Various Water Bodies, 2010.

SWAMP Data:

Water Quality Objective/Criterion:

In waters designated for contact recreation (REC-1), the fecal coliform concentration based on a minimum of not less than five samples for any 30-day period shall not exceed a geometric mean of 200/100 ml, nor shall more than ten percent of the total number of samples taken during any 30-day period exceed 400/100 ml.

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 below Bourland Meadow from Bourland Creek.

Temporal Representation:

Environmental Conditions:

Bourland Meadow lies within a designated research natural area where grazing is prohibited. This site was not grazed and served as the control site. The elevation of this sample location is 7,299 ft.

QAPP Information:

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest.

Line of Evidence (LOE) for Decision ID 85962, Indicator Bacteria	Region 5
Bourland Creek (Tuolumne County)

LOE ID:

60673

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:

Zero of the 3 samples exceeded the fecal coliform objective.

Data Reference:

Data for Fecal Col, E.coli, and Observations in Region 5 for Various Water Bodies, 2010.

Bacteria Contamination, Violations, and Field Data for Stanislaus, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Geometric Mean: In waters designated for contact recreation (REC-1), the fecal coliform geometric mean shall not exceed 200/100ml. re

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:

The samples were collected from Bourland Creek. CAR5364002320101020160322

Temporal Representation:

Samples were collected form July to August of 2009 and June to August of 2010.

Environmental Conditions:

Samples were collected from a natural meadow that was not grazed.

QAPP Information:

Samples were collected under the Surface Water Ambient Monitoring Project in the Stanislaus National Forest Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest by Central Sierra Environmental Resource Center.

Line of Evidence (LOE) for Decision ID 85962, Indicator Bacteria	Region 5
Bourland Creek (Tuolumne County)

LOE ID:

60670

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 11 samples exceeded the E. coli objective.

Data Reference:

Data for Fecal Col, E.coli, and Observations in Region 5 for Various Water Bodies, 2010.

Bacteria Contamination, Violations, and Field Data for Stanislaus, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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:

Single sample maximum allowable density for E. coli in freshwater is 235 MPN/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 from Bourland Creek.

Temporal Representation:

Samples were collected form July to August of 2009 and June to August of 2010. CAR5364002320101020160322

Environmental Conditions:

Samples were collected from a natural meadow that was not grazed.

QAPP Information:

Samples were collected under the Surface Water Ambient Monitoring Project in the Stanislaus National Forest Quality Assurance Project Plan. QA9

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest by Central Sierra Environmental Resource Center.

Line of Evidence (LOE) for Decision ID 85962, Indicator Bacteria	Region 5
Bourland Creek (Tuolumne County)

LOE ID:

60671

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 3 geomeans exceeded the E. coli objective.

Data Reference:

Data for Fecal Col, E.coli, and Observations in Region 5 for Various Water Bodies, 2010.

Bacteria Contamination, Violations, and Field Data for Stanislaus, 2009-2010.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

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 geometric mean objective for E. coli in freshwater is 126 MPN/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 from Bourland Creek. CAR5364002320101020160322

Temporal Representation:

Samples were collected form July to August of 2009 and June to August of 2010.

Environmental Conditions:

Samples were collected from a natural meadow that was not grazed.

QAPP Information:

Samples were collected under the Surface Water Ambient Monitoring Project in the Stanislaus National Forest Quality Assurance Project Plan.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest.

QAPP Information Reference(s):

Quality Assurance Project Plan for Stanislaus National Forest by Central Sierra Environmental Resource Center.