LL Anderson Dam Spillway Bench Repairs and Geotechnical Borings

Summary

SCH Number
2006048134
Lead Agency
Placer County Water Agency
Document Title
LL Anderson Dam Spillway Bench Repairs and Geotechnical Borings
Document Type
NOE - Notice of Exemption
Received
Posted
4/11/2006

Document Description
Several energy dissipation benches in the LL Anderson Dam spill channel sustained some erosion damage due to flows in the spillway in May 2005. This was the first spill since major modifications were made to the spillway in 1999. Repairs to the benches will consist of some loose rock excavation, installation of rockbolts, and placement of dental concrete. Small spring flows in the spillway will be diverted so that the work can be done in dry conditions. Also, vertical borings will be done in several locations in the spillway walls, invert, and on the dam itself, to obtain core samples and engineering data for the future spillway design. The work is planned for 2006 or 2007, after consultation with the Tahoe National Forest, which will include environmental protection measures, and after authorization to proceed from FERC.

Contact Information
Jon Mattson
Placer County Water Agency
P.O. Box 667
Foresthill, CA 95631

Phone : (530) 823-4886

Location

Counties
Placer
Other Location Info
City: Foresthill

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301(b)
Reasons for Exemption
The project consists of the repair and maintenance of existing public structures, and involves no expansion of use beyond that previously existing. The structures belong to a publicly-owned utility, and are used to support electric power generation and water supply.
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