# Final 2008 California 303(d)/305(b) Integrated Report

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | Blue Lake, Lower (Alpine County)
Water Body ID: | CAL5326001620081113233333
Water Body Type: | Lake & Reservoir

DECISION ID | 15028
Pollutant: | Oxygen, Dissolved
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. One lines of evidence are available in the administrative record to assess this pollutant. Five of the samples exceed the 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. Five of 39 samples fell below the minimum criterion specified in the Basin Plan 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 applicable water quality standards are not being exceeded.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 15028

LOE ID: | 25507
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | Total
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 39
Number of Exceedances: | 5
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | 39 samples were taken from the Blue Lake between July 2000 and September 2004. 5 samples exceed the minimum dissolved oxygen concentration (7 mg/L) and 0 sample exceeds 5 mg/L.
Data Reference: | Upper Mokelumne Watershed Assessment and Planning Project, Technical Memorandum Number 9: Watershed Assessment
Water Quality Objective/Criterion: | Minimum dissolved oxygen concentration for COLD and SPWN beneficial uses is 7 mg/L. Minimum dissolved oxygen concentration for WARM beneficial uses is 5 mg/L.
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from one of the (upper or lower)Blue Lakes in Alpine County.
Temporal Representation: | Samples were collected monthly between July 2000 and September 2004.
Environmental Conditions: |
QAPP Information: | Data quality: Good.
QAPP Information Reference(s):