Water Body Name: | Carson River, West Fork (Headwaters to Woodfords) |
Water Body ID: | CAR6332001420000207111737 |
Water Body Type: | River & Stream |
Lines of Evidence (LOEs) for Decision ID 6482 |
LOE ID: | 5375 |
Pollutant: | Sodium |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Agricultural Supply |
Number of Samples: | 19 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | Table 3 of the Region 6 staff report for the Basin Plan amendments summarizes annual average SAR values for the West Fork Carson River. Lahontan RWQCB staff calculated these averages using historical data on SAR or the component ions. For data collected by the South Tahoe Public Utility District between 1984 and 2002, annual average SAR values ranged from 0.2 to 0.3. The mean annual average value was 0.3. The water quality objective (SAR =1) was attained. |
Data Reference: | South Tahoe Public Utility District (PUD). Self-monitoring monthly reports from 2000 to 2003. Including Carson River and Indian Creek. South Lake Tahoe Public Utilities District. South Lake Tahoe, CA: Lahontan RWQCB |
South Tahoe Public Utility District (PUD). Self-monitoring monthly reports from 1997 to 2000. Including: Carson River and Indian Creek. South Lake Tahoe Public Utility District. South Lake Tahoe, CA: Lahontan RWQCB | |
Memorandum: Summary of water quality analysis for potential CWA 303(d) listing of the lower West Fork of the Carson River. South Lake Tahoe, CA: Lahontan RWQCB | |
2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. | |
2006. Technical Staff Report for Revised Sodium-Related Standards for the Carson and Walker River Watersheds. | |
Water Quality Objective/Criterion: | The water quality objective for Sodium Adsorption Ratio (SAR) in the West Fork Carson River is a limit of 1, as an annual average. (As a ratio, SAR has no units.) The objective includes the formula for calculating SAR and natural sources exclusion language.
The approved plan amendments have not yet been physically incorporated into the text of the Basin Plan. A copy of the amendments is included in the administrative record of the 2008 Integrated Report and is used as a reference in this LOE. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
2006. Amendments to the Water Quality Control Plan for the Lahontan Region: Revised Sodium-Related Standards for the Carson and Walker River Watersheds. Adopted October 12, 2006 under Resolution R6T-2006-0047. | |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | The data were collected in a canal diverting water from the West Fork Carson River upstream of the USGS gage at Woodfords. |
Temporal Representation: | The data cited above were collected at approximately monthly intervals between 1984 and 2002, for 224 samples in all. Nineteen annual average calculations were done. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley. It joins the East Fork to form the Carson River in Nevada. Water from the West Fork is used for irrigation of pasture and some field crops in the Carson Valley in California, and it contributes to the irrigation supply in Nevada. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 6480 |
LOE ID: | 27605 |
Pollutant: | Total Nitrogen as N |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The USGS sampled this station under the Region 6 SWAMP program between 2003 and 2005. Total Nitrogen was calculated from reported results for total Kjeldahl nitrogen and nitrite plus nitrate. Calculated total N concentrations in 10 quarterly samples ranged from 0.046 to 0.204 mg/L. Calculated means of monthly means were as follows: for 2003, 0.132 mg/L; for 2004, 0.146 mg/L; for 2005, 0.176 mg/L. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | The water quality objective for total nitrogen in this segment is 0.15 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled.. |
Temporal Representation: | Quarterly samples (3 to 4 per year) were collected between April 2003 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | Data meet the quality assurance requirements of the SWAMP QAPP. |
QAPP Information Reference(s): | |
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LOE ID: | 27603 |
Pollutant: | Total Kjeldahl Nitrogen (TKN) |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 2 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The USGS sampled this station under the Region 6 SWAMP program between 2003 and 2005. Concentrations of TKN in 10 samples ranged from 0.04 to 0.19 mg/L. Calculated means of monthly means were as follows: for 2003, 0.11 mg/L; for 2004, 0.15 mg/L; for 2005, 0.18 mg/L. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | The water quality objective for total Kjeldahl nitrogen in this segment is 0.13 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Samples were collected quarterly (3 to 4 per year) between April 2003 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | Data meet the quality assurance requirements of the SWAMP QAPP. |
QAPP Information Reference(s): | |
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LOE ID: | 27602 |
Pollutant: | Total Kjeldahl Nitrogen (TKN) |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | This segment was placed on the Section 303(d) list in 2002 on the basis of calculations by RWQCB staff using data collected by the South Tahoe Public Utility District between 1981 and 2000. The mean of monthly means for total Kjeldahl nitrogen in 2000 was 0.20 mg/L, exceeding the objective. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | The water quality objective for total Kjeldahl nitrogen in this segment is 0.13 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | The South Tahoe PUD data were collected in a diversion ditch upstream of the USGS gage at Woodfords. |
Temporal Representation: | The South Tahoe PUD samples were collected approximately monthly between 1981 and 2000. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The South Tahoe Public Utility District maintains its own laboratory and has a quality assurance program acceptable to the RWQCB. |
QAPP Information Reference(s): | |
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LOE ID: | 27599 |
Pollutant: | Total Nitrogen as N |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | This segment was placed on the Section 303(d) list in 2002 on the basis of calculations by RWQCB staff using data collected by the South Tahoe Public Utility District between 1981 and 2000. The mean of monthly means for total nitrogen in 2000 was 0.20 mg/L, exceeding the objective. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | The water quality objective for total nitrogen in this segment is 0.15 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | The South Tahoe PUD data were collected in a diversion ditch upstream of the USGS gage at Woodfords. |
Temporal Representation: | The South Tahoe PUD samples were collected approximately monthly between 1981 and 2000. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The South Tahoe Public Utility District maintains its own laboratory and has a quality assurance program acceptable to the RWQCB. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 6481 |
LOE ID: | 27595 |
Pollutant: | Phosphorus |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled the West Fork Carson River between 2003 and 2005 under the Region 6 SWAMP program. Concentrations of total phosphorus in 10 samples ranged from 0.012 to 0.061 mg/L. Calculated means of monthly means were as follows: 2003, 0.012 mg/L; 2004, 0.018 mg/L, and 2005, 0.022 mg/L. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The water quality objective for total phosphorus in thiis segment is 0.02 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Quarterly samples (3 or 4 per year) were collected between April 2003 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | Data meet the quality assurance requirements of the SWAMP QAPP. |
QAPP Information Reference(s): | |
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LOE ID: | 27592 |
Pollutant: | Phosphorus |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 4 |
Number of Exceedances: | 3 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | This segment was placed on the Section 303(d) list in 2002 on the basis of calculations by RWQCB staff using data collected by the South Tahoe Public Utility District between 1981 and 2000. The means of monthly means during the assessment period beginning in 1997 were as follows: 1997, 0.09 mg/L; 1998, 0.03 mg/L, 1999, 0.02 mg/L, 2000, 0.03 mg/L. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. | |
Water Quality Objective/Criterion: | The water quality objective for total phosphorus in thiis segment is 0.02 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | The South Tahoe PUD data were collected in a diversion ditch upstream of the USGS gage at Woodfords. |
Temporal Representation: | The South Tahoe PUD samples were collected approximately monthly between 1981 and 2000. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The South Tahoe Public Utility District maintains its own laboratory and has a quality assurance program acceptable to the RWQCB. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 16191 |
LOE ID: | 26739 |
Pollutant: | 2, 6- diethylaniline | 2-chloro-4-isopropylamino-6-amino-s-triazine | Alachlor | Atrazine | Azinphos-methyl (Guthion) | Benefin | Butylate | Carbaryl | Carbofuran | Chlorpyrifos | Cyanazine | DDE (Dichlorodiphenyldichloroethylene) | Dacthal | Diazinon | Dieldrin | Disulfoton | Dyfonate (Fonofos or Fonophos) | EPTC (Eptam, s-ethyl dipropylthiocarbamate) | Ethalfluralin | Ethoprop | Hexachlorobenzene/ HCB | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Linuron | Malathion | Methyl Parathion | Metolachlor | Metribuzin | Molinate | Napropamide | Parathion | Pendimethalin | Permethrin, total | Phorate | Prometon (Prometone) | Pronamide | Propachlor | Propanil (DCPA mono- and di-acid degrad) | Propargite | Simazine | Tebuthuron | Terbacil | Terbufos | Thiobencarb/Bolero | Triallate | Trifluralin |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Not Recorded |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 4 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The California Department of Pesticide Regulation's online database includes data for the West Fork Carson River at Woodfords. These data were collected in May, June, July and August 1994 as part of the U.S. Geological Survey's
National Water Quality Assessment (NAWQA) program.. Only one of the 46 listed pesticides (pebulate) was detected, in one of four samples. The concentration was reported as 0.0090 ug/L. |
Data Reference: | Department of Pesticide Regulation Database Records for the West Fork Carson River and Upper Truckee Rivers. |
Water Quality Objective/Criterion: | Documentation of water quality criteria for individual pollutants in Lines of Evidence for multipollutant datasets is not required, except for pollutants that exceed a standard or criterion. There are no state or federal water quality standards or criteria for pebulate, the only detectable pollutant in this dataset. The Lahontan Basin Plan includes a narrative water quality objective for pesticides in surface waters that provides that: "Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable leves, using the most recent detection procedures available." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River at Woodfords, was sampled. |
Temporal Representation: | Samples were collected on May 10, June 13, July 12, and August 8, 1994 and analyzed for the 46 listed pesticides. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. The Woodfords station was sampled as part of the USGS National Water Quality Assessment (NAWQA) study of the Carson River watershed in California and Nevada, as part of a larger study of the Truckee and Carson Rivers and Las Vegas Wash.. Woodfords is upstream of the portion of the watershed used for irrigated agriculture. |
QAPP Information: | The data meet USGS quality assurance requirements. |
QAPP Information Reference(s): | |
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LOE ID: | 26846 |
Pollutant: | 2, 6- diethylaniline | 2-chloro-4-isopropylamino-6-amino-s-triazine | Alachlor | Atrazine | Azinphos-methyl (Guthion) | Benefin | Butylate | Carbaryl | Carbofuran | Chlorpyrifos | Cyanazine | DDE (Dichlorodiphenyldichloroethylene) | Dacthal | Diazinon | Dieldrin | Disulfoton | Dyfonate (Fonofos or Fonophos) | EPTC (Eptam, s-ethyl dipropylthiocarbamate) | Ethalfluralin | Ethoprop | Hexachlorobenzene/ HCB | Lindane/gamma Hexachlorocyclohexane (gamma-HCH) | Linuron | Malathion | Methyl Parathion | Metolachlor | Metribuzin | Molinate | Napropamide | Parathion | Pendimethalin | Permethrin, total | Phorate | Prometon (Prometone) | Pronamide | Propachlor | Propanil (DCPA mono- and di-acid degrad) | Propargite | Simazine | Tebuthuron | Terbacil | Terbufos | Thiobencarb/Bolero | Triallate | Trifluralin |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Not Recorded |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 4 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The California Department of Pesticide Regulation's online database includes data for the West Fork Carson River at Woodfords. These data were collected in May, June, July and August 1994 as part of the U.S. Geological Survey's
National Water Quality Assessment (NAWQA) program.. Only one of the 46 listed pesticides (pebulate) was detected, in one of four samples. The concentration was reported as 0.0090 ug/L. |
Data Reference: | Department of Pesticide Regulation Database Records for the West Fork Carson River and Upper Truckee Rivers. |
Water Quality Objective/Criterion: | Documentation of water quality criteria for individual pollutants in Lines of Evidence for multipollutant datasets is not required, except for pollutants that exceed a standard or criterion. There are no state or federal water quality standards or criteria for pebulate, the only detectable pollutant in this dataset. The Lahontan Basin Plan includes a narrative water quality objective for pesticides in surface waters that provides that: "Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable leves, using the most recent detection procedures available." For waters designated for the Municipal and Domestic Supply beneficial use, the water quality objective references the California Maximum Contaminant Levels (MCLs) for pesticides. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River at Woodfords, was sampled. |
Temporal Representation: | Samples were collected on May 10, June 13, July 12, and August 8, 1994 and analyzed for the 46 listed pesticides. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. The Woodfords station was sampled as part of the USGS National Water Quality Assessment (NAWQA) study of the Carson River watershed in California and Nevada, as part of a larger study of the Truckee and Carson Rivers and Las Vegas Wash.. Woodfords is upstream of the portion of the watershed used for irrigated agriculture. |
QAPP Information: | The data meet USGS quality assurance requirements. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7714 |
LOE ID: | 4861 |
Pollutant: | Arsenic |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled arsenic in the West Fork Carson River under the Region 6 SWAMP program. One sample had an arsenic concentration of 0.6 ug/L. The California Toxics Rule standards were not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The California Toxics Rule standards for protection of freshwater aquatic life are:
4-day average = 150 ug/L 1-hour average = 340 ug/L |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | One sample was collected on 11/24/2004.. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
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LOE ID: | 4860 |
Pollutant: | Arsenic |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 1 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled arsenic in the West Fork Carson River under the Region 6 SWAMP program. One sample had an arsenic concentration of 0.6 ug/L. The MCL was not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The state MCL for arsenic is 10 ug/L (effective November 28, 2008). |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | One sample was collected on 11/24/2004. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7715 |
LOE ID: | 4862 |
Pollutant: | Boron |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled boron in the West Fork Carson River under the Region 6 SWAMP program. Boron concentrations in 4 of 8 samples were estimates and the remaining 4 samples were below the detection level. Means of monthly means are assumed to be zero. The objective was not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The site-specific objective in Lahontan Basin Plan Table 3-14 is 0.02 mg/L (= 20 ug/L) as a mean of monthly means. The objective applies upstream from Woodfords under the Tributary Rule. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Eight samples were collected between 2002 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The
"below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
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LOE ID: | 21501 |
Pollutant: | Boron |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 8 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled boron in the West Fork Carson River under the Region 6 SWAMP program. Boron concentrations in 4 of 8 samples were estimates and the remaining 4 samples were below the detection level. The California State Notification Level was not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The California State Notification Level for boron is 1000 ug/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Drinking Water Notification and Response Levels: An overview | |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Eight samples were collected between 2002 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The
"below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7808 |
LOE ID: | 4866 |
Pollutant: | Chloride |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled chloride in the West Fork Carson River under the Region 6 SWAMP program. Chloride concentrations in 10 samples ranged from 0.54 to 3.02 mg/L. The MCL was not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for chloride is 250 mg/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten samples were collected between 2002 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
| |
LOE ID: | 4864 |
Pollutant: | Chloride |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 3 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled chloride in the West Fork Carson River under the Region 6 SWAMP program. Chloride concentrations in 10 samples ranged from 0.54 to 3.02 mg/L. The mean of monthly means objective, calculated beginning in 2003, was exceeded in 3 of 3 years. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The site-specific objective in Lahontan Basin Plan Table 3-14 is 1.0 mg/L as a mean of monthly means. The objective applies upstream from Woodfords under the Tributary Rule. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten samples were collected between 2002 and 2005. Means of monthly means were calculated for each of three years. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7711 |
LOE ID: | 5727 |
Pollutant: | Dissolved oxygen saturation |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 7 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey measured dissolved oxygen in the West Fork Carson River under the Region 6 SWAMP program. Percent saturation in 7 quarterly samples taken between February 2004 and August 2005 ranged from 93 to 124 percent. The objective was not violated. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The applicable objective from the Lahontan Basin Plan states: "The dissolved oxygen concentration shall not be depressed by more than 10 percent, below 80 percent saturation, or below 7.0 mg/L at any time, whichever is more restrictive." (Note: this is a watershed-specific narrative objective that differs from the regionwide objectives in Basin Plan Table 3-6.) |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Seven quarterly measurements of percent saturation were taken between February 2004 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 10594 |
LOE ID: | 5891 |
Pollutant: | Fecal Coliform |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Water Contact Recreation |
Number of Samples: | 7 |
Number of Exceedances: | 1 |
Data and Information Type: | Water column surveys (e.g. fecal coliform) |
Data Used to Assess Water Quality: | The U.S. Geological Survey took quarterly samples under the Region 6 SWAMP program between November 2003 and May 2005. Counts of fecal coliform bacteria in seven samples included two samples below the detection level, four estimated values, and one count of 48 colonies per 100 mL. The last sample violated the objective. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan's objective for:coliform bacteria states:
"Waters shall not contain concentrations of coliform organisms attributable to anthropogenic sources, including human and livestock waste. The fecal coliform concentration during any 30-day period shall not exceed a log mean of 20/100 ml, nor shall more than 10 percent of all samples collected during any 30-day period exceed 40/100 ml. The log mean shall ideally be based on a minimum of not less than five samples collected a evenly spaced as practicable during any 30-day period. However, a log mean concentration exceeding 20/100 ml for any 30-day period shall indicate violation of this objective even if fewer than five samples were collected." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Seven quarterly samples for fecal coliform were taken between November 2003 and May 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
| |
LOE ID: | 5889 |
Pollutant: | Fecal Coliform |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 7 |
Number of Exceedances: | 1 |
Data and Information Type: | Water column surveys (e.g. fecal coliform) |
Data Used to Assess Water Quality: | The U.S. Geological Survey took quarterly samples under the Region 6 SWAMP program between November 2003 and May 2005. Counts of fecal coliform bacteria in seven samples included two samples below the detection level, four estimated values, and one count of 48 colonies per 100 mL. The last sample violated the objective. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan's objective for coliform bacteria states:
"Waters shall not contain concentrations of coliform organisms attributable to anthropogenic sources, including human and livestock waste. The fecal coliform concentration during any 30-day period shall not exceed a log mean of 20/100 ml, nor shall more than 10 percent of all samples collected during any 30-day period exceed 40/100 ml. The log mean shall ideally be based on a minimum of not less than five samples collected a evenly spaced as practicable during any 30-day period. However, a log mean concentration exceeding 20/100 ml for any 30-day period shall indicate violation of this objective even if fewer than five samples were collected." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Seven quarterly samples for fecal coliform were taken between November 2003 and May 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 16413 |
LOE ID: | 27607 |
Pollutant: | Nitrate/Nitrite (Nitrite + Nitrate as N) |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The USGS sampled this station under the Region 6 SWAMP program between 2003 and 2005. Concentrations of nitrite plus nitrate in 10 samples ranged from below the detection level to 0.084 mg/L. The MCL was not exceeded. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for nitrite plus nitrate is 10 mg/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Quarterly samples were collected between April 2003 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | Data meet the quality assurance requirements of the SWAMP QAPP. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 16414 |
LOE ID: | 27606 |
Pollutant: | Nitrite |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 4 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The USGS sampled this station under the Region 6 SWAMP program between 2003 and 2005. Four samples for nitrite were all below the detection level. The MCL was not exceeded. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for nitrite is 1 mg/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Four samples were collected in April, August, and November 2003 and in August 2004. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | Data meet the quality assurance requirements of the SWAMP QAPP. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7712 |
LOE ID: | 4879 |
Pollutant: | Oxygen, Dissolved |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey measured dissolved oxygen in the West Fork Carson River under the Region 6 SWAMP program. Dissolved oxygen concentrations in 10 samples ranged from 8 to 12.2 mg/L.. The objective was not violated. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The applicable water quality objective from the Lahontan Basin Plan states: "The dissolved oxygen concentration shall not be depressed by more than 10 percent, below 80 percent saturation, or below 7.0 mg/L at any time, whichever is more restrictive." (Note: this is a watershed-specific narrative objective that differs from the regionwide objectives in Basin Plan Table 3-6.) |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten quarterly dissolved oxygen samples were taken between 2003 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 16235 |
LOE ID: | 27045 |
Pollutant: | Pebulate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Not Recorded |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 4 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The California Department of Pesticide Regulation database contains data from the USGS National Water Quality Assessment (NAWQA) program. Four samples were collected in May, June, July and August 1994. Pebulate was detected in one sample collected June 13, 1994, at a concentration of 0.0090 ug/L. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | There are no specific state or federal standards or criteria for pebulate. The Lahontan Basin Plan includes a narrative water quality objective for pesticides in surface waters that provides that: "Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable leves, using the most recent detection procedures available." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Samples were collected in May, June, July an August 1994. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | USGS quality assurance procedures were used. |
QAPP Information Reference(s): | |
| |
LOE ID: | 27046 |
Pollutant: | Pebulate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Not Recorded |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 4 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The California Department of Pesticide Regulation database contains data from the USGS National Water Quality Assessment (NAWQA) program. Four samples were collected in May, June, July and August 1994. Pebulate was detected in one sample collected June 13, 1994, at a concentration of 0.0090 ug/L. |
Data Reference: | Department of Pesticide Regulation Database Records for the West Fork Carson River and Upper Truckee Rivers. |
Water Quality Objective/Criterion: | There are no specific state or federal standards or criteria for pebulate. The Lahontan Basin Plan includes a narrative water quality objective for pesticides in surface waters that provides that: "Pesticide concentrations, individually or collectively, shall not exceed the lowest detectable leves, using the most recent detection procedures available." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Samples were collected in May, June, July an August 1994. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | USGS quality assurance procedures were used. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7786 |
LOE ID: | 4883 |
Pollutant: | Sediment |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled suspended sediment in the West Fork Carson River under the Region 6 SWAMP program and calculated sediment loads with concurrent flow data. Instantaneous discharge flows ranged from 7.3 to 549 cfs. The highest flow was measured during spring runoff season in May 2005. Suspended sediment concentrations in 10 samples ranged from 1 to 32 mg/L. Suspended sediment loads in 8 calculations ranged from 0.06 to 47 tons per day. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The objective in the Lahontan Basin Plan states: "The suspended sediment load and suspended sediment discharge rate of surface waters shall not be altered in such a manner as to cause nuisance or adversely affect the water for beneficial uses." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten samples were collected between 2003 and 2005 and 8 loading calculations were done. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7713 |
LOE ID: | 4882 |
Pollutant: | Specific Conductance |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey measured specific conductance in the West Fork Carson River under the Region 6 SWAMP program. Ten field measurements ranged from 36 to 80 uS/cm. The MCL was not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for specific conductance is 900 microsiemens per centimeter (uS/cm). |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten field measurements were collected between 2003 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7809 |
LOE ID: | 4884 |
Pollutant: | Sulfates |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 3 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled the West Fork Carson River under the Region 6 SWAMP program between 2003 and 2005. Sulfate concentrations in 10 samples ranged from 0.8 to 3.8 mg/L. The annual mean of monthly means, calculated for each year from 2003 to 2005, exceeded the objective in each year (the highest value was 2.44 mg/L in 2003). |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The site-specific objective for sulfate is 2.0 mg/L as a mean of monthly means (applied upstream through the Tributary Rule from the West Fork Carson River at Woodfords station). See Basin Plan Table 3-14. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten quarterly samples were collected between 2003 and 2005 and means of monthly means were computed for three years. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
| |
LOE ID: | 4885 |
Pollutant: | Sulfates |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled suspended sediment in the West Fork Carson River under the Region 6 SWAMP program. Sulfate concentrations in 10 samples ranged from 0.8 to 3.8 mg/L. The MCL was not exceeded. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for sulfate is 250 mg/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten samples were collected between 2003 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7757 |
LOE ID: | 5885 |
Pollutant: | Temperature, water |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled temperature quarterly under the Region 6 SWAMP program between April 2003 and August 2005. Temperature in 10 measurements ranged from 0 to 16.5 degrees Celsius. . |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The temperature objective in the Lahontan Basin Plan states: "The natural receiving water temperature of all waters shall not be altered unless it can be demonstrated to the satisfaction of the Regional Board that such an alteration in temperature does not adversely affect the water for beneficial uses.
For waters designated WARM, water temperature shall not be altered by more than five degrees Fahrenheit ... above or below the natural temperature. For waters designated COLD, the temperature shall not be altered. Temperature objectives for COLD interstate waters and WARM interstate waters are as specified in the 'Water Quality Control Plan for Control of Temperature in The Coastal and Interstate Waters and Enclosed Bays and Estuaries of California' including any revisions." |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten quarterly water temperature measurements were taken between April 2003 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 7810 |
LOE ID: | 4887 |
Pollutant: | Total Dissolved Solids |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled chloride in the West Fork Carson River under the Region 6 SWAMP program. TDS concentrations in 10 samples ranged from 35 to 71 mg/L. The annual mean of monthly means, calculated for each year from 2003 to 2005, exceeded the objective in one out of 3 years (the highest value was 57.5 mg/L in 2004). |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The site-specific objective for total dissolved solids (TDS) is 55 mg/L as a mean of monthly means (applied upstream through the Tributary Rule from the West Fork Carson River at Woodfords station). See Lahontan Basin Plan Table 3-14. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten samples were collected between 2002 and 2005. Annual means of monthly means were calculated for a three year period. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
| |
LOE ID: | 4886 |
Pollutant: | Total Dissolved Solids |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total Dissolved |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled TDS in the West Fork Carson River under the Region 6 SWAMP program. TDS concentrations in 10 quarterly samples collected between 2003 and 2005 ranged from 35 to 71 mg/L. The MCL was not violated. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for Total Dissolved Solids is 500 mg/L. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten quarterly samples were collected between 2002 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 16180 |
LOE ID: | 4888 |
Pollutant: | Turbidity |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 2 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station under of the Region 6 SWAMP program.between 2003 and 2004. Two of 6 field turbidity measurements expressed as NTU were below the detection level. The other samples ranged from 2 to 31 NTU. With calculations counting the estimated values as zeros, the means of monthly means were 1.3 NTU for 2003 and 7.0 NTU for 2004. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The Lahontan Basin Plan's objective for turbidity states:
"The turbidity shall not be raised above a mean of monthly means value of 2 NTU. (This objective is approximately equal to the State of Nevada standard of 2 NTU annual mean)." This is a watershed-specific objective that differs from the regionwide narrative objective. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Six field turbidity measurements expressed as NTU were taken in 2003 and 2004. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
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LOE ID: | 21502 |
Pollutant: | Turbidity |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 4 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station under of the Region 6 SWAMP program.between 2004 and 2005. Three of 4 field turbidity measurements expressed as NTRU were below the detection level. The fourth sample had a turbidity of 8.4 NTRU. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for turbidity expressed as NTRU for the protection of aquatic life. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Four field turbidity measurements expressed as NTRU were taken in 2004 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
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LOE ID: | 21504 |
Pollutant: | Turbidity |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 4 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station under of the Region 6 SWAMP program.between 2004 and 2005. Three of 4 field turbidity measurements expressed as NTRU were below the detection level. The fourth sample had a turbidity of 8.4 NTRU. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | There are no state or federal standards or criteria for turbidity expressed as NTRU for the protection of human health. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Four field turbidity measurements expressed as NTRU were taken in 2004 and 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): | |
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LOE ID: | 21503 |
Pollutant: | Turbidity |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Municipal & Domestic Supply |
Number of Samples: | 6 |
Number of Exceedances: | 2 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey sampled this station under of the Region 6 SWAMP program.between 2003 and 2004. Two of 6 field turbidity measurements expressed as NTU were below the detection level. The other samples ranged from 2 to 31 NTU. Two samples exceeded the MCL. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The MCL for turbidity is 5 NTU. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Six field turbidity measurements expressed as NTU were taken in 2003 and 2004. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 10608 |
LOE ID: | 4881 |
Pollutant: | pH |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | None |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 10 |
Number of Exceedances: | 0 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The U.S. Geological Survey measured pH in the West Fork Carson River under the Region 6 SWAMP program. The pH values in 10 samples collected from 2003 to 2005 ranged from 6.9 to 7.9 units. |
Data Reference: | 2007. SWAMP Data for the East Fork and West Fork Carson River Hydrologic Units. |
Water Quality Objective/Criterion: | The applicable objective states: "Changes in normal ambient pH levels shall not exceed 0.5 unit." This is a watershed-specific objective, different from the Lahontan Basin Plan's regionwide objective . |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Ten pH measurements were taken between 2003 and 2005. . |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. The "below Willow Creek" station is in Hope Valley near the headwaters. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The quality assurance requirements of the SWAMP QAPP were met. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 16264 |
LOE ID: | 27604 |
Pollutant: | Nitrate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 2 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | The USGS sampled this station under the Region 6 SWAMP program between 2003 and 2005. Data were collected for nitrate plus nitrite (as N). A smaller number of samples collected for nitrite alone were all below the detection level. Assuming the nitrate plus nitrite concentrations to be representative of nitrate, concentrations in 10 samples ranged from below the detection level (one sample) to 0.084 mg/L. Calculated means of monthly means for nitrate were as follows: for 2003, 0.019 mg/L; for 2004, 0.023 mg/L, and for 2005, 0.027 mg/L. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | The water quality objective for nitrate (as N) in this segment is 0.02 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | One station, West Fork Carson River below Willow Creek, was sampled. |
Temporal Representation: | Quarterly samples (3 to 4 per year) were collected between April 2003 and August 2005. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | Data meet the quality assurance requirements of the SWAMP QAPP. |
QAPP Information Reference(s): | |
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LOE ID: | 27601 |
Pollutant: | Nitrate |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Dissolved |
Beneficial Use: | Cold Freshwater Habitat |
Number of Samples: | 1 |
Number of Exceedances: | 1 |
Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) |
Data Used to Assess Water Quality: | This segment was placed on the Section 303(d) list in 2002 on the basis of calculations by RWQCB staff using data collected by the South Tahoe Public Utility District between 1981 and 2000. The mean of monthly means for nitrate in 2000 was 0.04 mg/L, exceeding the objective. |
Data Reference: | Administrative Record of Lahontan RWQCB's 2001-2002 Section 303(d) List Update Process Resolution R6T-2002-0002 |
Water Quality Objective/Criterion: | The water quality objective for nitrate (as N) in this segment is 0.02 mg/L, expressed as an annual mean of monthly means. This is a running average incorporating historical data. |
Objective/Criterion Reference: | 2007. Water Quality Control Plan for the Lahontan Region (as amended). |
Evaluation Guideline: | |
Guideline Reference: | |
Spatial Representation: | The South Tahoe PUD data were collected in a diversion ditch upstream of the USGS gage at Woodfords. |
Temporal Representation: | The South Tahoe PUD samples were collected approximately monthly between 1981 and 2000. |
Environmental Conditions: | The West Fork Carson River is an interstate river with headwaters near the Sierra Nevada crest and its lowest point in California in the Carson Valley, transitional between Sierra and Great Basin ecological conditions. In addition to the Cold Freshwater Habitat beneficial use, the West Fork Carson River is designated for the Spawning, Reproduction, and Development Use. |
QAPP Information: | The South Tahoe Public Utility District maintains its own laboratory and has a quality assurance program acceptable to the RWQCB. |
QAPP Information Reference(s): |