Draft 2008 California 303(d)/305(b) Integrated Report

Supporting Information

Regional Board 6 - Lahontan Region

Water Body Name: Squaw Creek
Water Body ID: CAR6352001119980805095744
Water Body Type: River & Stream
 
DECISION ID
15614
 
Pollutant: Chloride
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
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples, or the single monthly mean datapoint, exceeds the applicable water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfy the data quality requirements of section 6.1.4 of the Policy.
2. The data used do not satisfy the data quantity requirements of section 6.1.5 or Table 3.2 of the Policy.
3. None of three samples exceeded the California Maximum Contaminant Level. The single monthly mean datapoint did not exceed the site-specific objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff 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 it cannot be determined if applicable water quality standards are not being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 15614
 
LOE ID: 26279
 
Pollutant: Chloride
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: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. Chloride concentrations were 1.7, 1.8, and 1.8 mg/L. The mean concentration for this month was 1.8 mg/L The water quality objective was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
Water Quality Objective/Criterion: The site-specific objective for chloride, from Lahontan Basin Plan Table 3-11, is 3.0 mg/L as a mean of monthly means for the period of record.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
LOE ID: 26281
 
Pollutant: Chloride
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. Chloride concentrations were 1.7, 1.8, and 1.8 mg/L. The MCL was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
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: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data..
QAPP Information Reference(s):
 
DECISION ID
15615
 
Pollutant: Iron
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
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. The single sample does not exceed California Maximum Contaminant Level (MCL) or the site-specific water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used do not satisfy the data quantity requirements of section 6.1.5 or Table 3.1 of the Policy.
3. The single sample did not exceed the MCL or the site specific objective and this does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff 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 it cannot be determined if applicable water quality standards are not being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 15615
 
LOE ID: 26282
 
Pollutant: Iron
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: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for one sample collected at Station D-3 in Squaw Creek. The iron concentration was 116 ug/L. The objective was not violated.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
Water Quality Objective/Criterion: The site-specific objective for iron, from Lahontan Basin Plan Table 3-11, is 0.13 mg/L ( equal to 130 ug/L) as a mean of monthly means for the period of record.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Iron was determined for one sample from Station D-3.
Temporal Representation: One sample was collected on December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
LOE ID: 26283
 
Pollutant: Iron
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: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for one sample collected at Station D-3 in Squaw Creek. The iron concentration was 116 ug/L. The MCL was not violated.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
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 iron is 300 ug/L.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Iron was determined for one sample from Station D-3.
Temporal Representation: One sample was collected on December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
DECISION ID
15617
 
Pollutant: Nitrate
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
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceeds the California Maximum Contaminant Level (MCL). The single monthly mean datapoint exceeds the site-specific water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfy the data quality requirements of section 6.1.4 of the Policy.
2. The data used do not satisfy the data quantity requirements of section 6.1.5 of the Policy. (All samples were collected on a single day.)
3. None of three samples exceeded the MCL The single monthly mean exceeded the site-speciric objective. This does not exceed the allowable frequency listed in Table 3.1 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff 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 it cannot be determined if applicable water quality standards are not being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 15617
 
LOE ID: 26284
 
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: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. NO3-N concentrations were 0.12, 0.14, and 0.23 mg/L. The mean concentration for this month was 0.16 mg/L, in violation of the objective.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
Water Quality Objective/Criterion: The site-specific objective for nitrate (NO3-N), from Lahontan Basin Plan Table 3-11, is 0.05 mg/L as a mean of monthly means for the period of record.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
LOE ID: 26285
 
Pollutant: Nitrate
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. NO3-N concentrations were 0.12, 0.14, and 0.23 mg/L. The MCL was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
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 nitrate is 45 mg/L expressed "as nitrate," equivalent to 10 mg/L expressed "as N."
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
DECISION ID
15619
 
Pollutant: Sulfates
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
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceeds the California Maximum Contaminant Level (MCL). The single monthly mean data point does not exceed the site-specific water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfy the data quality requirements of section 6.1.4 of the Policy.
2. The data used do not satisfy the data quantity requirements of section 6.1.5 or Table 3.2 of the Policy.
3. Non of 3 samples exceeded the MCL. The single monthly mean did not exceed the site-specific objective and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff 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 it cannot be determined if applicable water quality standards are not being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 15619
 
LOE ID: 26286
 
Pollutant: Sulfates
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: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. Sulfate concentrations were 9.2, 10.4 and 10.4 mg/L. The mean concentration for this month was 10.0 mg/L The water quality objective was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
Water Quality Objective/Criterion: The site-specific objective for sulfate, from Lahontan Basin Plan Table 3-11, is 25.0 mg/L as a mean of monthly means for the period of record.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
LOE ID: 26287
 
Pollutant: Sulfates
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. Sulfate concentrations were 9.2, 10.4 and 10.4 mg/L. The MCL was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
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: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
DECISION ID
15620
 
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
 
Weight of Evidence: This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status.

Two lines of evidence are available in the administrative record to assess this pollutant. None of the samples exceeds the California Maximum Contaminant Level (MCL). The single monthly mean datapoint does not exceed the site-specific water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy.
2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy.
3. [NUMBER] of [NUMBER] samples exceeded the ______ and this does not exceed the allowable frequency listed in Table 3.2 of the Listing Policy.
4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff 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 it cannot be determined if applicable water quality standards are not being exceeded.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 15620
 
LOE ID: 26288
 
Pollutant: Total Dissolved Solids
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: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. TDS concentrations were 29, 38, and 44 mg/L. The mean concentration for this month was 37 mg/L The water quality objective was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
Water Quality Objective/Criterion: The site-specific objective for Total Dissolved Solids (TDS), from Lahontan Basin Plan Table 3-11, is 85 mg/L as a mean of monthly means for the period of record.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
LOE ID: 26290
 
Pollutant: Total Dissolved Solids
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 3
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Squaw Valley Public Service District (a drinking water purveyor) submitted laboratory results for three samples collected on December 19, 2006 at three different stations in Squaw Creek. TDS concentrations were 29, 38, and 44 mg/L. The MCL was not exceeded.
Data Reference: 2007. Chemical Report dated 01/08/07 on samples collected from Squaw Creek on 12/19/06 by the Squaw Valley Public Service District
 
Water Quality Objective/Criterion: California Maximum Contaminant Levels (MCLs) apply to ambient waters under the Lahontan Basin Plan's "Chemical Constituents" objective. The recommended MCL for Total Dissolved Solids (TDS) is 500 mg/L.
Objective/Criterion Reference: 2007. Water Quality Control Plan for the Lahontan Region (as amended).
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Three stations (D-1, D-2 and D-3) were sampled.
Temporal Representation: All three samples were collected on the same date, December 19, 2006.
Environmental Conditions: Squaw Creek is a tributary of the Truckee River downstream of Lake Tahoe. Its watershed includes residential, commercial and recreational (ski resort and golf course) development. Part of the creek channel has been hydromodified.
QAPP Information: The data were analyzed by Cranmer Analytical Laboratory, a California state certified laboratory. Some quality assurance information was provided with the data.
QAPP Information Reference(s):
 
DECISION ID
6591
 
Pollutant: Sedimentation/Siltation
Final Listing Decision: List on 303(d) list (being addressed by USEPA approved TMDL)
Last Listing Cycle's Final Listing Decision: List on 303(d) list (TMDL required list)(2006)
Revision Status Revised
Sources: Construction/Land Development | Drainage/Filling Of Wetlands | Highway Maintenance and Runoff | Hydromodification | Natural Sources | Nonpoint Source | Other Urban Runoff | Recreational and Tourism Activities (non-boating)
TMDL Name: Squaw Creek Sediment
TMDL Project Code: 186
Date TMDL Approved by USEPA: 07/27/2007
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed.
 
RWQCB Board Decision / Staff Recommendation: The sediment TMDL was adopted by the RWQCB in 2006 and approved by the USEPA in 2007. No new data were assessed in 2008. The decision should be changed from "List on 303(d) List (TMDL Required)" to "List on 303(d) List (being addressed by USEPA approved TMDL).
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 6591
 
LOE ID: 2869
 
Pollutant: Sediment
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples:
Number of Exceedances:
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The Squaw Creek Sediment TMDL was approved by the RWQCB in 2006 and subsequently approved by USEPA.
Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006.
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion:
Objective/Criterion Reference:
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):