HomeMy WebLinkAbout4.27.22 Board Correspondence - FW_ Dam Safety Compliance Report submitted in FERC P-619-000,et al. by Pacific Gas and Electric Company,et al. (2)
From:Paulsen, Shaina
To:BOS
Subject:Board Correspondence - FW: Dam Safety Compliance Report submitted in FERC P-619-000,et al. by Pacific Gas and Electric Company,et al.
Date:Wednesday, April 27, 2022 8:02:50 AM
Please see Board Correspondence below.
Shaina Paulsen
Associate Clerk of The Board
Butte County Administration
25 County Center Drive, Suite 200, Oroville, CA 95965
T: 530.552.3304 | F: 530.538.7120
-----Original Message-----
From: 'FERC eSubscription' <eSubscription@ferc.gov>
Sent: Tuesday, April 26, 2022 5:56 PM
Subject: Dam Safety Compliance Report submitted in FERC P-619-000,et al. by Pacific Gas and Electric Company,et al.
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On 4/26/2022, the following Filing was submitted to the Federal Energy Regulatory Commission (FERC), Washington D.C.:
Filer: Pacific Gas and Electric Company
Pacific Gas & Electric Company (as Agent)
Docket(s): P-619-000
P-803-000
P-2105-000
Lead Applicant: Pacific Gas and Electric Company
Filing Type: Dam Safety Compliance Report
Description: Pacific Gas and Electric Company submits supplemental information re FERC comments on Probable Maximum Flood Studies for Bucks Creek Project et. al. under P-619 et. al.
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245 Market Street
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San Francisco, CA 94105
Mailing Address:
Mail Code N11D
P.O. Box 770000
San Francisco, CA 94177
April 26, 2022
Via Electronic Submittal (E-File)
Frank L. Blackett, P.E., Regional Engineer
Federal Energy Regulatory Commission
Division of Dam Safety and Inspections
San Francisco Regional Office
100 First Street, Suite 2300
San Francisco, CA 94105-3084
RE: Bucks Creek Hydroelectric Project, FERC No. 619-CA
DeSabla-Centerville Hydroelectric Project, FERC No. 803-CA
Upper North Fork Feather River Hydroelectric Project, FERC No. 2105-CA
Supplemental Information on Probable Maximum Flood Studies
Comment Responses
Dear Frank L. Blackett:
This letter presents supplemental information
related to Federal Energy Regulatory Commission (FERC) comments regarding the probable
Bucks Creek (FERC No. 619),
DeSabla-Centerville (FERC No. 803), and Upper North Fork Feather River (FERC No. 2105)
Hydroelectric Projects. FERC provided the comments in a letter to PG&E dated February 16,
2021. PG&E submitted its original plan and schedule for providing supplemental information in
comments in a letter to your office dated April 2, 2021.
comments is enclosed with this letter
(Enclosure 1).
safety engineer, Ben Fontana, at (530) 762-9459. For general questions, please contact
Jackie Pope, at (530) 254-4007.
Sincerely,
Robert O. Ellis, P.E., G.E.
Deputy Chief Dam Safety Engineer
Enclosure:
1. Supplemental Information in Response to FERC Comments on Probable Maximum Flood
Studies for Selected Dams in the Feather River Watershed
Enclosure 1
Bucks Creek Hydroelectric Project, FERC No. 619-CA
Bucks Storage Dam, NATDAM No. CA00332
Bucks Storage Dam, NATDAM No. CA00332
Grizzly Forebay Dam, NATDAM No. CA00333
DeSabla-Centerville Hydroelectric Project, FERC No. 803-CA
Philbrook Dam, NATDAM No. CA00345
Upper North Fork Feather River Hydroelectric Project, FERC No. 2105-CA
Lake Almanor Dam, NATDAM No. CA00327
Butt Valley Dam, NATDAM No. CA00326
Belden Forebay Dam, NATDAM No. CA00413
Supplemental Information in Response to FERC Comments on Probable
Maximum Flood Studies for Selected Dams in the Feather River Watershed
In a letter to Pacific Gas and Electric Company (PG&E) dated February 16, 2021, the
Federal Energy Regulatory Commission (FERC) provided comments regarding
Bucks
Creek (FERC No. 619), DeSabla-Centerville (FERC No. 803), and Upper North Fork
Feather River (FERC No. 2105) Hydroelectric Projects. PG&E provided initial response
comments along with a plan and schedule to provide supplemental
information in a letter to FERC dated April 2, 2021.
are copied below, followed by Psupplemental responses(in italics).
Comment 1:
With the exception of Lake Almanor Dam, six of the seven dams studied are
predicted to overtop for flows calculated from the revised PMF study (either by the
PMF stillwater reservoir level alone, or by the stillwater level with added wind-
generated setup and wave runup). However, your submittal does not discuss any
potential dam safety implications that would result from the overtopping at these
dams nor any proposed actions to address this issue. Evaluate the potential impacts
that overtopping would have on these dams and provide a plan and schedule to
mitigate against any adverse effects that the overtopping could have on dam safety.
You must develop a long-term plan and schedule for performing the appropriate
analyses, evaluating remedial options, prioritizing which projects to address first, and
enacting final remedial measures.
, letter responding to comments regarding PG&E
PMF studies provided a summary of ourrecent efforts to mitigate the risks of
potential overtopping at the subject dams. PG&E a portfolio-
wide Spillway Assessment and Improvement Program (SAIP). The purpose of the
SAIP is to address potential deficiencies identified during focused spillway
Since the 2017 assessment,
PG&E has been actively addressing near and immediate-term recommendations to
mitigate risk associated with spillway deficiencies, such as implementation of
additional surveillance and monitoring efforts and maintenance repairs of the
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Enclosure 1
spillways. PG&E has provided the status of completed recommendations from the
2017 assessment in separate letters and correspondence to FERC.
Within the SAIP, all spillways represented by the Feather River Watershed PMF
study, except the Lake Almanor spillway, have been identified as undersized to pass
flood flows up to the Pies. The SAIP serves
-term plan for performing appropriate analyses, evaluating remedial
options, and enacting final remedial measures to address the risk of overtopping of
these dams during floods up to the PMF. PG&E has communicated our plans and
schedules for the SAIP in separate letters and correspondence to FERC. In
accordance with the plans and schedules, PG&E plans to submit an analysis of
potential alternatives for the dams that overtop for floods up to the PMF for FERC
review by April 30, 2022. PG&E believes the responses provided in PG&E April 2,
2021, letter to FERC coupled with this response satisfactorily addresses this
comment and no further response is necessary.
Comment 2:
Since your submittals indicate the potential of flows overtopping your dams during
the PMF event, your plan and schedule requested above must include an evaluation
of the necessity of implementing interim risk reduction measures (IRRMs). Any
IRRMs deemed necessary should be in effect until such time the overtopping
concern is resolved.
At this time, PG&E does not believe additional IRRMs are needed beyond the risk
reduction measures identified and recommended as part of the most recent potential
failure mode analysis (PFMA)and 5-year safety inspections for all dams represented
by the Feather River Watershed PMF study. PG&E believes that the response
provided herein satisfactorily address this comment and no further response is
necessary.
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