Lake Fordyce Dam Seepage Mitigation, Notice of Determination

3 Documents in Project

Summary

SCH Number
2020090506
Lead Agency
SWRCB, Division of Water Rights (State Water Resources Control Board, Division of Water Rights)
Document Title
Lake Fordyce Dam Seepage Mitigation, Notice of Determination
Document Type
NOD - Notice of Determination
Received
Posted
11/2/2020
Project Applicant
Pacific Gas and Electric Company
Present Land Use
Forest

Document Description
In 2005, the California Department of Water Resources, Division of Safety of Dams (DSOD) instituted a seepage threshold of 30 cubic feet per second (cfs) for Lake Fordyce Dam. Seepage at Lake Fordyce Dam exceeded the threshold in November 2011. Accordingly, in 2012 DSOD required PG&E to submit a plan and schedule to mitigate the seepage. The Project is intended to bring Lake Fordyce Dam into compliance with DSOD’s seepage threshold. The Project includes placing an impermeable membrane liner on the dam’s upstream face to cutoff seepage through the embankment and construct a new concrete plinth and grout curtain at the upstream toe of the dam. To implement these dam improvements, Lake Fordyce Road would be improved to allow construction equipment access. Additionally, a cofferdam would be constructed in Lake Fordyce to create a dry work area on the upstream face of the dam. The Project is scheduled to occur from April to October each year for three consecutive years. The cofferdam may be removed in the fourth year of construction due to weather conditions in the third construction year. During Project construction, minimum flow releases of 5 cfs into Fordyce Creek would continue to be met. This is to advise that the State Water Resources Control Board (Lead Agency) has, based on the record before it, approved the above described project on October 30, 2020, and has made the following determinations regarding the above described project.

Contact Information
Jordan Smith
State Water Resources Control Board
1001 I Street
Sacramento, CA 95818

Phone : (916) 323-3645
jordan.smith@waterboards.ca.gov

Location

Coordinates
39°22'51.8"N 120°29'48.2"W
Counties
Nevada Placer
Waterways
Fordyce Lake, Fordyce Creek
Other Location Info
The dam is on Fordyce Creek, a tributary of the South Fork of the Yuba River, in Nevada County; the dam is about 7 miles northwest of Soda Springs, California, and 15.5 miles west-northwest of Truckee, California

Notice of Determination

Approving Agency
State Water Resources Control Board
Approving Agency Role
Lead Agency
Approved On
Final Environmental Document Available at
State Water Resources Control Board 1001 I street

Determinations

(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No

Attachments

Notice of Determination
2310A-2020-10-30-SWRCB-NOD ISMND-signed   PDF 275 K CDFW Filing Receipt   PDF 224 K

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