Upper Blue Lake Dam Seismic Retrofit Project

2 Documents in Project

Summary

SCH Number
2019039037
Lead Agency
Regional Water Quality Control Board, Region 5 (Central Valley), Sacramento
Document Title
Upper Blue Lake Dam Seismic Retrofit Project
Document Type
MND - Mitigated Negative Declaration
Received

Document Description
Pacific Gas & Electric Company (PG&E) is proposing to construct the Upper Blue Lake Dam Seismic Retrofit Project at Upper Blue Lake reservoir in Alpine County. A preliminary seismic slope stability evaluation of the dam that was conducted in 2014 indicated that the dam would likely liquefy during an earthquake. The proposed project would improve the seismic stability of the dam by placing a 50-ft wide by 175-ft long rock fill buttress on the upstream side of the Upper Blue Lake dam. The addition of the buttress would require an upstream extension of two low level outlet pipes by approx. 50 ft and reconfiguration of the intake structure and trash rack. The project area consists of the dam retrofit area, bypass piping, staging and parking areas, and spoils placement and storage areas.

Contact Information
Nicholas White
RWQCB, Central Valley
11020 Sun Center Drive, #200
Rancho Cordova, CA 95670

916-464-4856

Location

Coordinates
38°37'41.7"N 119°56'25.9"W
Cities
Kirkwood
Counties
Alpine
Cross Streets
Blue Lakes Rd and Forestdale Rd
Zip
96120
Total Acres
5.9
Parcel #
04-010-004
Waterways
Upper Blue Lake, Middle Creek, Lower Blue Lake
Township
9N
Range
19E
Section
18

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities (dam Type)
Local Action
Dam repair
Project Issues
Wetland/Riparian Water Supply Water Quality Vegetation Traffic/Circulation Toxic/Hazardous Soil Erosion/Compaction/Grading Recreation/Parks Noise Minerals Geologic/Seismic Forest Land/Fire Hazard Drainage/Absorption Biological Resources Archaeologic-Historic Air Quality
Reviewing Agencies
Department of Fish and Wildlife, Region 2 Cal Fire California Department of Parks and Recreation California Energy Commission California Public Utilities Commission Caltrans, District 10 Department of Conservation Department of Toxic Substances Control Department of Water Resources Native American Heritage Commission Office of Historic Preservation Resources Agency State Lands Commission State Water Resources Control Board, Division of Water Quality

Attachments

Environmental Document
2019-03-07_UBL_IS-MND_Public_Draft   PDF 27689 K
NOC
NOC   PDF 570 K
State Comments
037 cdfw   PDF 397 K
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