HomeMy WebLinkAbout9.7.22 Board Correspondence - FW_ Compliance Directives issued in FERC P-2088-000From:Clerk of the Board
To:Bennett, Robin; Clerk of the Board; Connelly, Bill; Cook, Holly; Cook, Robin; Hironimus, Patrizia; Kimmelshue, Tod; Lucero, Debra; Paulsen, Shaina; Pickett,
Andy; Reaster, Kayla; Ritter, Tami; Stephens, Brad J.; Sweeney, Kathleen; Teeter, Doug; Valencia, Shyanne
Subject:Board Correspondence - FW: Compliance Directives issued in FERC P-2088-000
Date:Wednesday, September 7, 2022 9:49:49 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
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From: 'FERC eSubscription' <eSubscription@ferc.gov>
Sent: Wednesday, September 7, 2022 9:45 AM
Subject: Compliance Directives issued in FERC P-2088-000
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On 9/7/2022, the Federal Energy Regulatory Commission (FERC), Washington D.C., issued this document:
Docket(s): P-2088-000
Lead Applicant: South Feather Water & Power Agency
Filing Type: Compliance Directives
General Correspondence
Description: Letter to South Feather Water and Power Agency discussing the May 31, 2022 to June 3, 2022 Dam Safety Inspection of the South Feather
Water and Power Project under P-2088.
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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
September 7, 2022
In reply refer to:
Project No. 2088-CA
Mr. Rath Moseley
General Manager
South Feather Water and Power Agency
2310 Oro-Quincy Highway
Oroville, CA 95965
Re: 2022 Dam Safety Inspection Follow-up
Dear Mr. Moseley:
From May 31 to June 3, 2022, Mr. Ricardo Galdamez and I inspected the South
Feather Water and Power Project, FERC No. 2088. Based on observations made and
discussions held during the inspection, we have the action items that require your
attention listed in the Enclosure.
Within 30 days of this letter, please provide responses to these items or submit a
plan and schedule for doing so. File your submittal using the Commission’s eFiling
system at https://www.ferc.gov/ferc-online/overview. For all Dam Safety and Public
Safety Documents, select Hydro: Regional Office and San Francisco Regional Office
from the eFiling menu. The cover page of the filing must indicate that the material was
eFiled. For assistance with eFiling, contact FERC Online Support at
FERCOnlineSupport@ferc.gov, (866) 208-3676 (toll free), or (202) 502-8659 (TTY).
We appreciate your cooperation in this aspect of the Commission’s dam safety
program. If you have any questions, please contact Mr. Galdamez at (415) 369-3310.
Sincerely,
Frank L. Blackett, P.E.
Regional Engineer
Enclosure
2
cc:
Ms. Sharon Tapia, Division Manager
CA Dept. of Water Resources
Division of Safety of Dams
P.O. Box 942836
Sacramento, CA 94236-0001
Dam Safety Inspection Follow Up
South Feather Water and Power Project, FERC P-2088 Enclosure
1 of 2
General Comments:
Little Grass Valley Dam:
1. A void underneath the spillway flip bucket was observed. SFWP should assess
whether structural undermining of the flip bucket is occurring.
2. There is a crack in the concrete trunnion block that supports the right radial arm of
the left radial gate. The crack should be monitored for changes.
3. Concrete cracks from 1/8-inch to 1/2-inch in width are visible throughout the
spillway surface, and within some of those cracks steel reinforcement is visible.
SFWPA should assess which cracks require repair and provide a plan and schedule
for doing so. At a minimum, this should include all those with exposed
reinforcement.
4. There is a small cluster of coniferous trees growing within 25 feet of the left side
of the dam toe that were identified during the inspections. These trees should be
removed.
Sly Creek Dam:
5. On both sides of the spillway chute, and within 2 to 3 feet from the edge of the
chute walls, trees are present and should be removed to prevent damage to the
spillway walls.
6. On the spillway surface, cracks varying in width from 1/8-inch to ½-inch and
various lengths were observed throughout, horizontally, and longitudinally.
SFWP should assess the cracks and provide a plan and schedule for repairing
cracks that require repair.
7. On the right side of the spillway, approximately 100-feet from the gates there is
what appeared to be a small impact area on the spillway-bed and the wall,
presumably created by falling rock. The impacted surface area measures
approximately 3 by 4 feet and should be repaired before this winter.
8. On the downstream side of the dam, approximately 125 feet from the right
abutment, small alignment offsets between panels of the Mechanically Stabilized
Earth wall (MSE) were observed and could potentially signal a displacement in
progress. These displacements should be visually monitored for changes.
Dam Safety Inspection Follow Up
South Feather Water and Power Project, FERC P-2088 Enclosure
2 of 2
Lost Creek Dam:
9. A ½-inch designed gap separates the precast reinforced deck-sections on the
bridge. The compound used to seal that gap is deteriorating and the edges of the
concrete deck are observed to be chipping away appearing to enlarge the gap.
SFWP should investigate this condition and assess whether repairs are required to
prevent further deterioration of the bridge deck.
Ponderosa Dam:
10. The left concrete wall at the spillway approach channel, which also retains the
upstream section of the right embankment, is leaning into the channel. A
movement gauge placed on top of the wall shows additional movement since the
gauge was installed. PFM No. 3 describes the potential concern with the wall
alignment. SFWPA should investigate the movement of the wall and assess
whether remediation is required to prevent further damage.
South Fork and Slate Creek Dams
11. To prevent concrete deterioration on the downstream face of both dams,
vegetation observed to be growing along the horizontal joints should be removed
and the joints cleaned of any accumulated organics.