HomeMy WebLinkAbout5.23.22 Board Correspondence - FW_ Project Operations Compliance Report submitted in FERC P-619-000 by Pacific Gas and Electric Company,et al. (2)
From:Paulsen, Shaina
To:BOS
Subject:Board Correspondence - FW: Project Operations Compliance Report submitted in FERC P-619-000 by Pacific Gas and Electric Company,et al.
Date:Monday, May 23, 2022 3:53:44 PM
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: Monday, May 23, 2022 3:45 PM
Subject: Project Operations Compliance Report submitted in FERC P-619-000 by Pacific Gas and Electric Company,et al.
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On 5/23/2022, the following Filing was submitted to the Federal Energy Regulatory Commission (FERC), Washington D.C.:
Filer: Pacific Gas and Electric Company
No Organization Found (as Agent)
Docket(s): P-619-000
Lead Applicant: Pacific Gas and Electric Company
Filing Type: Project Operations Compliance Report
Description: Pacific Gas and Electric Company submits Supplemental Information in Response to FERC May 10, 2022 Letter re Design Change to the Access Improvement Project for Grizzly
Forebay Dam for Bucks Creek
Hydroelectric Project under P-619.
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Mailing Address:
Mail Code N11D
P.O. Box 770000
San Francisco, CA 94177
May 23, 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
Grizzly Forebay Dam, NATDAM No. CA00333
Design Change to Access Improvement Project Response to Comment
Dear Frank L. Blackett:
on a design change to the access
improvement project at Grizzly Forebay Dam, which is part of Bucks Creek
Hydroelectric Project, FERC No. 619.
May 10, 2022is enclosed with this letter
(Enclosure 1).
Based on the information enclosed with this letter, PG&E believes that FERC comment
from the May 10, 2022, letter has been adequately addressed and no further action is
necessary. Should you have technical questions concerning this matter, please contact
Ben Fontana, senior dam safety engineer for PG&E, at (530) 762-9459. For general
questions, please contact Jamie Visinoni, senior license coordinator for PG&E, at (530)
215-6676.
Sincerely,
Robert O. Ellis, P.E., G.E.
Deputy Chief Dam Safety Engineer
Enclosure:
1. Response to FERC Comment Regarding Design Change to the Access Improvement Project
ENCLOSURE 1
Enclosure 1
Bucks Creek Hydroelectric Project, FERC No. 619-CA
Grizzly Forebay Dam, NATDAM No. CA00333
Response to FERC Comment
Regarding Design Change to the Access Improvement Project
In a letter to Pacific Gas and Electric Company (PG&E) dated May 10, 2022, the
Federal Energy Regulatory Commission (FERC) provided a comment regarding the
design change for the access improvement project for Grizzly Forebay Dam, which is
part of PG Bucks Creek Hydroelectric Project, FERC No. 619. For reference,
is
Comment 1:
Ultimate bond strengths were updated as result of field observation as shown in
2021, memo. Please provide additional information on how the
updated ultimate bond strengths were estimated.
Unconfined compressive strength was measured by rebound hammer (ASTM C805)
and recorded in Section 2 of the GHD memorandum dated October 6, 2021, provided
to your office in a letter dated April 7, 2022. Rock dowel bond strength was updated
with the data collected in the field and summarized in Section 3 of the October 6,
2021, GHD memorandum. Bond strength was estimated using unconfined
compressive strengths (UCS) of the bedrock near the stair alignments and footing
locations, published values from the Post-Tensioning Institute (PTI)
(Recommendations for Prestressed Rock and Soil Anchors, PTI DC35.1-14), and
percent of UCS
to estimate ultimate bond strength as recommended by PTI and use a safety factor of
2 for design. For example, the left abutment achieved UCS of 7,700 pounds per
square inch (psi) and the geotechnical memorandum recommended an ultimate bond
strength of 770 psi.
In the original design and in the design change notification, the required bond
stresses for rock dowels were all relatively low; none of the calculated rock bond
design stresses exceed 50 psi. In summary, the larger values included in the October
6, 2021, GHD memorandum were not necessary.
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