Pacific Gas & Electric Company (PG&E) Rock Creek Dam Toe Void Repair Project

Summary

SCH Number
2019028319
Lead Agency
Regional Water Quality Control Board, Region 5 (Central Valley), Redding
Document Title
Pacific Gas & Electric Company (PG&E) Rock Creek Dam Toe Void Repair Project
Document Type
NOE - Notice of Exemption
Received

Document Description
A depression in the rock backfill behind the left downstream training wall of Rock Creek Dam, initially detected in the early 2000's, and a void under the L-shaped training wall, discovered during subsequent dive inspections, indicates that the backfill could be migrating into the plunge pool below. Dive inspections indicate that the training wall foundation has experienced some undermining and if not mitigated, could progress thereby inducing a dam safety risk. PG&E proposes to repair toe voids at Rock Creek Dam's left abutment and downstream training wall. The project objectives are to fill the depression in the rock backfill, fill voids in the left training wall, restore foundation contact for left abutment training wall, repair voids in concrete flip bucket wall and armor the foundation materials against further degradation.

Contact Information
Lynn Coaster
CV RWQCB
364 Knollcrest Drive, Suite 205
Redding, CA 96002

530.224.2437

Location

Coordinates
39.987021°'"N -121.282552°'"W
Township
25N
Range
6E
Section
26/35
Other Location Info
The PG&E Rock Creek Dam Toe Void Repair Project is located at the Rock Creek Dam on the North Fork Feather River adjacent to State Highway 70, immediately south of the Rock Creek Reservoir, south of Belden, and north of Rodger's Flat.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301
Reasons for Exemption
The project involves both investor and publically owned utilities used to provide electric power, natural gas, sewerage, or other public utility services.
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