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

Supporting Information

Regional Board 6 - Lahontan Region

Water Body Name: Tinemaha Reservoir
Water Body ID: CAL6032000019980806135932
Water Body Type: Lake & Reservoir
 
DECISION ID
5444
 
Pollutant: Copper
Final Listing Decision: Delist from 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Delist from 303(d) list (TMDL required list)(2006)
Revision Status Original
Reason for Delisting: State determines water quality standard is being met
Impairment from Pollutant or Pollution: Pollutant
 
Weight of Evidence: This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under section 4.1 a single line of evidence is necessary to assess listing status.

Four lines of evidence are available in the administrative record to assess this pollutant. Only one sample exceeded the water quality objective.

Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing 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. One of a total of 54 samples taken during 2002 exceeded the water quality objective and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. The one exceedance may have been due to inadequate sample bottle preparation.
4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
 
RWQCB Board Decision / Staff Recommendation: This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
 
SWRCB Board Decision / Staff Recommendation:
 
USEPA Decision:
 
 
Lines of Evidence (LOEs) for Decision ID 5444
 
LOE ID: 744
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: None of the 6 samples exceeded the standard (LRWQCB, 2003a).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: CTR for freshwater chronic (hardness based).
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: At Reservoir Outlet.
Temporal Representation: Samples collected once per month from 8/21/2002 to 11/7/2002.
Environmental Conditions:
QAPP Information: Clear QA/QC Plan included in the report.
QAPP Information Reference(s):
 
LOE ID: 743
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Dissolved
 
Beneficial Use: Cold Freshwater Habitat
 
Number of Samples: 6
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: None of the 6 samples exceeded the standard (LRWQCB, 2003a).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: CTR for freshwater chronic (hardness based).
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Owens River near Reservoir Inlet.
Temporal Representation: Samples collected once per month from 8/21/2002 to 11/7/2002
Environmental Conditions:
QAPP Information: Clear QA/QC Plan included in the report.
QAPP Information Reference(s):
 
LOE ID: 742
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 20
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: There were a total of 20 samples. Of the 20 samples, there were 0 exceedances (all but 1 sample were nondetects) (LRWQCB, 2003a).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: MCL for drinking water is 1 mg/L for copper.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Tinemaha Reservoir outlet.
Temporal Representation: Sampling occurred twice monthly from 1/15/02 to 10/16/02.
Environmental Conditions:
QAPP Information: Clear QA/QC Plan included in the report.
QAPP Information Reference(s):
 
LOE ID: 741
 
Pollutant: Copper
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: Total
 
Beneficial Use: Municipal & Domestic Supply
 
Number of Samples: 21
Number of Exceedances: 0
 
Data and Information Type: Not Specified
Data Used to Assess Water Quality: There were a total of 22 samples, 21 were used to make the assessment. One sample showed high concentration and it was stated in the report that this "may be due to inadequate sample bottle preparation, which was enhanced with an additional acid wash after first sampling event when travel blanks had detectable total copper concentrations. A replicate of this sample also showed unusually high concentrations, therefore this sample is not being considered (although it should be noted that it still does not exceed standards). Of the 21 useable samples, there were 0 exceedances (all but 2 were nondetects) (LRWQCB, 2003a).
Data Reference: Placeholder reference 2006 303(d)
 
Water Quality Objective/Criterion: MCL for drinking water is 1 mg/L for copper.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
 
Evaluation Guideline:
Guideline Reference:
 
Spatial Representation: Owens River above Tinemaha Reservoir.
Temporal Representation: Sampling occurred twice monthly from 1/15/02 to 10/16/02.
Environmental Conditions:
QAPP Information: Clear QA/QC Plan included in the report.
QAPP Information Reference(s):