HomeMy WebLinkAbout02.13.20 Email from FERC - Letter to PGE discussing the Tenth Indep. Consultant's Safety Insp. Report for Grizzly Forebay Dam, etc. for Bucks Creek Project under P-619
FEDERAL ENERGY REGULATORY COMMISSION
Office of Energy Projects
Division of Dam Safety and Inspections San Francisco Regional Office
100 First Street, Suite 2300
San Francisco, CA 94105-3084
(415) 369-3300 Office (415) 369-3322 Facsimile
February 13, 2020
In reply refer to:
Project No. 619-CA
NATDAM No. CA00333
Ms. Debbie Powell, Vice President
Pacific Gas and Electric Company
Mail Code N11E
P.O. Box 770000
San Francisco, CA 94177-0001
Re: Tenth or Grizzly Forebay Dam
Dear Ms. Powell:
We have reviewed the Tenth Independent
(Part 12D Report) for Grizzly Forebay Dam, which is part of the Bucks Creek Project,
FERC Project No. 619. The report and STID updates were submitted with a cover letter
dated October 29, 2015.
The report format conforms to the requirements of Chapter 14 of the
. We agree with the conclusions made by the
independent consultant in Section 1.2 and with the recommendations listed in Section 1.3
of the report.
We have reviewed your plan and schedule dated December 28, 2015 to address the
We acknowledge your December 18, 2015
letter requesting to submit both plan and schedules simultaneously. We have the
following comment on the report:
We do not concur with the classification of PFM No. 1 as Category IV. Although
the analyses of both the left and right abutment blocks show adequate stability
under normal, unusual, and extreme loadings, PG&E should still monitor for this
PFM by inspecting the toe and abutments of the dam following significant spill
events. PFM No. 1 should be reclassified from Category IV to Category II
Potential Failure mode. Please revise the Supporting Technical Information
Document (STID) to reflect this change.
2
program. If you have any questions, please contact Mr. Edgar Salire at (415) 369-3369.
Sincerely,
Frank L. Blackett, P.E.
Regional Engineer