Draft California 2026 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 5 - Central Valley Region

Water Body Name:	Rumsey Slough (Lake County)
Water Body ID:	CAR5135503020191216036466
Water Body Type:	River & Stream


DECISION ID	153852	Region 5
Rumsey Slough (Lake County)

Pollutant:	Specific Conductivity
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:	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 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 153852, Specific Conductivity	Region 5
Rumsey Slough (Lake County)

LOE ID:

313372

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for SpecificConductivity. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for specific conductance of 900 - 1600 uS/cm assessed as an annual average.

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:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

Big Valley Rancheria Band of Pomo Indians. 2013. Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures.

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153852, Specific Conductivity	Region 5
Rumsey Slough (Lake County)

LOE ID:

313450

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153852, Specific Conductivity	Region 5
Rumsey Slough (Lake County)

LOE ID:

313599

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153852, Specific Conductivity	Region 5
Rumsey Slough (Lake County)

LOE ID:

313429

Pollutant:

Specific Conductivity

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Not Recorded

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures


DECISION ID	147972	Region 5
Rumsey Slough (Lake 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. Four lines of evidence are available in the administrative record to assess this pollutant. Pursuant to section 6.1.5.9 of the Listing Policy, this assessment utilized the upper limit of the optimal temperature range for rainbow trout for growth and completion of most life stages to interpret the narrative water quality objective for temperature. 9 of 24 samples exceeded the evaluation guideline for COLD. However, the available data are insufficient to satisfy the Listing Policy requirements for spatial and temporal representation (sections 6.1.5.2 and 6.1.5.3). The surface water grab samples collected did not provide sufficient temporal and spatial representation to determine if temperature conditions experienced by aquatic life were within the optimal temperature range throughout the entire water column or the length of time temperature conditions may have exceeded the optimal temperature range. Available information for this waterbody-pollutant combination is insufficient to determine whether the aquatic beneficial use is supported. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available for this Integrated Report cycle indicating that standards are not met. However, the exceedances of the evaluation guideline indicate that beneficial uses may be threatened. This decision will be reevaluated in a future Integrated Report cycle as more data and information become available. Additional data and information may include information demonstrating that sample location(s) are representative of conditions throughout the waterbody, data from additional sampling locations, continuous monitoring data collected in the waterbody, waterbody-specific information on sensitive resident species, their life stage time frames, and the appropriate temperature thresholds necessary to support each life stage.

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 147972, Temperature, water	Region 5
Rumsey Slough (Lake County)

LOE ID:

292320

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147972, Temperature, water	Region 5
Rumsey Slough (Lake County)

LOE ID:

292297

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147972, Temperature, water	Region 5
Rumsey Slough (Lake County)

LOE ID:

292577

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 3 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147972, Temperature, water	Region 5
Rumsey Slough (Lake County)

LOE ID:

292487

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 6 samples exceeded the water quality threshold for Temperature.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures


DECISION ID	153713	Region 5
Rumsey Slough (Lake 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:	This pollutant is being considered for placement on the CWA section 303(d) List under section 3.2 of the Listing Policy. Zero samples exceeded the objectives, guidelines, or criteria for beneficial uses applicable to this water segment-pollutant combination, which is less than the minimum number of exceedances needed to place the water segment on the section CWA section 303(d) List for conventional or other pollutants (Table 3.2 of the Listing Policy). The data used satisfies the data quality requirements (section 6.1.4) and data quantity requirements (section 6.1.5) of the Listing Policy. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. 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.

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 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313317

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 0 of the 7 samples fall within the range, and 7 of 7 samples fall below the threshold.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The California Secondary MCL that is incorporated by reference into the Water Quality Control Plan for the Sacramento and San Joaquin River Basins specifies a range for total dissolved solids of 500 - 1000 mg/L assessed as an annual average.

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2012-12-18 and 2018-12-19

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313723

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313724

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313153

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 7 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 1 of the 7 samples fall within the range, and 6 of 7 samples fall below the threshold.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2012-12-18 and 2018-12-19

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

312956

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 0 of the 8 samples fall within the range, and 8 of 8 samples fall below the threshold.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2011-06-16 and 2018-09-25

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313743

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313747

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 1 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 0 of the 1 samples fall within the range, and 1 of 1 samples fall below the threshold.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2019-09-24 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 153713, Total Dissolved Solids	Region 5
Rumsey Slough (Lake County)

LOE ID:

313081

Pollutant:

Total Dissolved Solids

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

Dissolved

Beneficial Use:

Municipal & Domestic Supply

Number of Samples:

Number of Exceedances:

Data and Information Type:

PHYSICAL/CHEMICAL MONITORING

Data Used to Assess Water Quality:

Water Board staff assessed STORET data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 0 of 8 samples exceeded the upper limit of the range for Total Dissolved Solids. Additionally, 2 of the 8 samples fall within the range, and 6 of 8 samples fall below the threshold.

Data Reference:

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

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2011-12-16 and 2018-07-20

Environmental Conditions:

QAPP Information:

STORET

QAPP Information Reference(s):

This is a placeholder reference for data that was collected after QAPP requirements were developed, but exempt from the requirements.


DECISION ID	147971	Region 5
Rumsey Slough (Lake County)

Pollutant:	pH
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:	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 147971, pH	Region 5
Rumsey Slough (Lake County)

LOE ID:

292383

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147971, pH	Region 5
Rumsey Slough (Lake County)

LOE ID:

292456

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147971, pH	Region 5
Rumsey Slough (Lake County)

LOE ID:

292453

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147971, pH	Region 5
Rumsey Slough (Lake County)

LOE ID:

292409

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:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 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: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures


DECISION ID	147970	Region 5
Rumsey Slough (Lake County)

Pollutant:	Oxygen, Dissolved
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
TMDL Priority:	Low
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. Eight lines of evidence are available in the administrative record to assess this pollutant for Cold Freshwater Habitat (COLD) and Fish Spawning (SPWN). Twenty-four of the 24 samples exceed the objective for COLD. Twenty-four of the 24 samples exceed the objective for SPWN. 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. Twenty-four of the 24 samples exceed the objective for COLD. Twenty-four of the 24 samples exceed the objective for SPWN. 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 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292472

Pollutant:

Oxygen, Dissolved

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:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292316

Pollutant:

Oxygen, Dissolved

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292544

Pollutant:

Oxygen, Dissolved

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:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292450

Pollutant:

Oxygen, Dissolved

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL14 (Rumsey Slough End (Near Osprey Ct.)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292337

Pollutant:

Oxygen, Dissolved

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL13 (Rumsey Slough by the old bridge).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292336

Pollutant:

Oxygen, Dissolved

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:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL15 (Rumsey Slough Mid Site (Wooldridge's property)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292471

Pollutant:

Oxygen, Dissolved

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 Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as COLD is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures

Line of Evidence (LOE) for Decision ID 147970, Oxygen, Dissolved	Region 5
Rumsey Slough (Lake County)

LOE ID:

292541

Pollutant:

Oxygen, Dissolved

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:

Water Board staff assessed Big Valley Band of Pomo Indians of the Big Valley Rancheria, California data for Rumsey Slough (Lake County) to determine beneficial use support and results are as follows: 6 of 6 samples exceeded the water quality threshold for Oxygen, Dissolved.

Data Reference:

WQ data from the federal Water Quality Portal (WQP) assembled for the 2024 Integrated Report in Region 5.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

The minimum dissolved oxygen concentration for waters designated as SPWN is 7.0 mg/L. (Water Quality Control Plan, Central Valley Region, Sacramento River Basin and San Joaquin Basin)

Objective/Criterion Reference:

Evaluation Guideline:

Guideline Reference:

Spatial Representation:

The samples were collected at 1 monitoring site: CA_BVR-BVCL16 (Rumsey Slough Mouth (Catfish Alley)).

Temporal Representation:

The samples were collected between the dates of 2019-04-25 and 2019-09-24

Environmental Conditions:

QAPP Information:

QAPP Information Reference(s):

Surface Water Quality Monitoring in the Waters of Big Valley Rancheria (BVR) Band of Pomo Indians, California: Big Valley Rancheria Surface Water Quality Procedures