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Home My WebLink About05.08.26 Board Correspondence - FW_ Dam Safety Compliance Report submitted in FERC P-1121-000,et al. by Pacific Gas and Electric CompanyFrom:Clerk of the Board To:Clerk of the Board; Connelly, Bill; Cook, Holly; Cook, Robin; Durfee, Peter; Jessee, Meegan; Kimmelshue, Tod; Kitts, Melissa; Krater, Sharleen; Lee, Lewis; Little, Melissa; Pickett, Andy; Ritter, Tami; Stephens, Brad J.; Sweeney, Kathleen; Teeter, Doug; Zepeda, Elizabeth Cc:Loeser, Kamie; Cannon, Jamie Subject:Board Correspondence - FW: Dam Safety Compliance Report submitted in FERC P-1121-000,et al. by Pacific Gas and Electric Company Date:Friday, May 8, 2026 8:24:55 AM Please see Board Correspondence - Lewis Lee Administrative Technician - Confidential Butte County Administration 25 County Center Drive, Suite 200 • Oroville, CA 95965 T: 530.552.3326 www.buttecounty.ca.gov | lelee@buttecounty.ca.gov -----Original Message----- From: 'FERC eSubscription' <eSubscription@ferc.gov> Sent: Friday, May 8, 2026 5:46 AM Subject: Dam Safety Compliance Report submitted in FERC P-1121-000,et al. by Pacific Gas and Electric Company .ATTENTION: This message originated from outside Butte County. Please exercise judgment before opening attachments, clicking on links, or replying.. On 5/7/2026, the following Filing was submitted to the Federal Energy Regulatory Commission (FERC), Washington D.C.: Filer: Pacific Gas and Electric Company Docket(s): P-1121-000 P-619-000 P-2310-000 P-137-008 P-77-001 P-2105-000 P-803-000 Lead Applicant: Pacific Gas and Electric Company Filing Type: Dam Safety Compliance Report Description: Pacific Gas and Electric Company submits results of a second spillway screening-level risk analysis to prioritize and schedule major capital improvement projects at the Battle Creek Hydroelectric Project et al. under P-1121 et al. To view the document for this Filing, click here https://urldefense.com/v3/__https://elibrary.ferc.gov/eLibrary/filelist? accession_num=20260507-5129__;!!KNMwiTCp4spf!GOLx7Sn3tZ72q4Cw8kM08jNpv2af-l3ATXFRCT- TQTjp9hkEWBpILGIZpGnQkjKOOmJwvAEhVDeAmXyat4Fw24eZ0a57ID_3fLRz$ To modify your subscriptions, click here: l3ATXFRCT-TQTjp9hkEWBpILGIZpGnQkjKOOmJwvAEhVDeAmXyat4Fw24eZ0a57IEQxtgPo$ ------------------------------------------------------------------------ Please do not respond to this email. Online help is available here: https://urldefense.com/v3/__http://www.ferc.gov/efiling-help.asp__;!!KNMwiTCp4spf!GOLx7Sn3tZ72q4Cw8kM08jNpv2af- l3ATXFRCT-TQTjp9hkEWBpILGIZpGnQkjKOOmJwvAEhVDeAmXyat4Fw24eZ0a57IABBvi0W$ or for phone support, call 866-208-3676. Power Generation 300 Lakeside Drive Oakland, CA 94612 Mailing Address: P.O. Box 28209 Oakland, CA 94604 May 7, 2026 Via Electronic Submittal (E-File) Frank L. Blackett, P.E., Regional Engineer Federal Energy Regulatory Commission Division of Dam Safety and Inspections 100 First Street, Suite 2300 San Francisco, CA 94105-3084 RE: Battle Creek Hydroelectric Project, FERC No. 1121-CA Bucks Creek Hydroelectric Project, FERC No. 619-CA DeSabla-Centerville Hydroelectric Project, FERC No. 803-CA Drum-Spaulding Hydroelectric Project, FERC No. 2310-CA Mokelumne River Hydroelectric Project, FERC No. 137-CA Potter Valley Hydroelectric Project, FERC No. 77-CA Upper North Fork Feather River Hydroelectric Project, FERC No. 2105-CA Findings from PG&E’s Spillway Screening-Level Risk Analysis ENCLOSURES CONTAIN CUI//CEII – DO NOT RELEASE Dear Frank L. Blackett: This letter presents the results of a second spillway screening-level risk analysis (SSLRA) conducted by Pacific Gas and Electric Company (PG&E) to prioritize and schedule major capital improvement projects across its portfolio of spillways. In an August 4, 2023, letter to FERC, PG&E submitted the results of its first SSLRA, along with a prioritized schedule for nine planned spillway projects. In a subsequent letter to FERC dated June 26, 2024, PG&E presented a plan to conduct a second SSLRA including five additional spillway projects. The 14 dams with spillways assessed under the two SSLRAs are listed in Table 1 below. After completing the second SSLRA in late 2025, PG&E updated its prioritized project schedules to include the five spillways evaluated in 2025 with the original nine spillways evaluated in 2023. In addition to the updated schedules, this letter provides a summary of the interim risk-reduction measures (IRRMs) that PG&E is implementing to manage potential risks until the major capital improvement projects are completed. Frank L. Blackett, P.E., Regional Engineer May 7, 2026 Page 2 Table 1. Spillways Evaluated through PG&E’s Spillway Screening-Level Risk Analyses Hydroelectric Project Dam Drum-Spaulding Project, FERC No. 2310 Lake Fordyce Dam, NATDAM No. CA00357 Halsey Afterbay, NATDAM No. CA00352 Bucks Creek Project, FERC No. 619 Bucks Diversion Dam, NATDAM No. CA00331 Spring Gap-Stanislaus Project, FERC No. 2130 Relief Dam, NATDAM No. CA00390 Mokelumne River Project, FERC No. 137 Upper Bear River Dam, NATDAM No. CA00379 Battle Creek Project, FERC 1121 North Battle Creek Dam, NATDAM No. CA00394 Macumber Dam, NATDAM No. CA00393 Upper North Fork Feather River Project, FERC No. 2105 Lake Almanor Dam, NATDAM No. CA00327 Belden Forebay Dam, NATDAM No. CA00413 Butt Valley Dam, NATDAM No. CA00326 DeSabla-Centerville Project, FERC No 803 Philbrook Dam, NATDAM No. CA00345 Round Valley Dam, NATDAM No. CA00346 Bucks Creek Project, FERC No. 619 Bucks Storage Dam, NATDAM No. CA00332 Potter Valley Project, FERC No. 77 Cape Horn Dam, NATDAM No. CA00399 Following the 2017 Oroville Dam spillway incident, PG&E established its Spillway Assessment and Improvement Program (SAIP) to conduct engineering assessments and manage follow-up actions to address potential deficiencies at its spillways. To date, the program has identified 16 spillways that require major capital improvement projects, with additional spillways currently under evaluation. As part of the SAIP, PG&E established a dedicated Capital Improvement Program (CIP) to facilitate planning, design, and execution of the proposed spillway remediation projects. For the spillway CIP projects at the 14 dams listed in Table 1, PG&E used a risk-informed framework, including SSLRA, to prioritize and schedule the projects for construction. PG&E retained Gannett Fleming, Inc., to facilitate the first SSLRA workshop in fall 2022. PG&E retained Slate Geotechnical Consultants to facilitate the second SSLRA workshop in fall 2024. The SSLRA reports (dated July 2023 and December 2025) are enclosed with this letter (Enclosures 1 and 2, respectively). PG&E has reviewed the SSLRA reports and concurs with the findings and conclusions presented therein. A PG&E memorandum summarizing the SSLRA results and presenting PG&E’s proposed prioritization for remedial projects at the 14 spillways is provided in (Enclosure 3). The memorandum describes the risk-informed framework and methodology used to rank, prioritize, and schedule the projects. To optimize the use of available resources, the proposed projects are divided into three tiers with staggered development schedules. Spillways found to have the highest risk are generally prioritized for earlier remediation, with some adjustments for existing conditions, logistical considerations, and other factors. PG&E’s plans and schedules for the long-term spillway remediation projects are provided in (Enclosure 4). The schedules include proposed timelines for key milestones in the project execution process. As described in Enclosure 3, PG&E recognizes that additional Frank L. Blackett, P.E., Regional Engineer May 7, 2026 Page 3 projects may be added to the spillway CIP as ongoing engineering evaluations are completed. To incorporate new projects, PG&E plans to perform supplemental risk assessments and periodically update the prioritized project schedule. When projects are added, removed, or reprioritized based on new information, PG&E will submit the revised plans and schedules to FERC. Because of the extended time frame required to develop and implement the planned capital improvements, PG&E is implementing IRRMs to manage potential risks until the long-term remediation projects are completed. As part of the risk-informed process for prioritizing the projects, PG&E identified and evaluated existing and potential new spillway- related IRRMs. Results of the evaluation and a summary of IRRMs for spillways at each of the dams identified in Table 1 are provided in (Enclosure 5). Should you have technical questions concerning this matter, please contact Chris Duffey, engineer for PG&E’s SAIP, at (530) 513-9559. For general questions, please contact Jackie Pope, senior license coordinator for PG&E, at (530) 254-4007. Sincerely, David L. Ritzman, P.E., G.E. Chief Dam Safety Engineer Enclosures: CUI//CEII – DO NOT RELEASE 1. Spillway Risk Prioritization Workshop, Focused Portfolio Analysis, prepared by Gannett Fleming and dated October/November 2022 2. Spillway Screening-Level Risk Assessment Report, prepared by Slate Geotechnical Consultants and dated December 2025 3. Spillway Prioritization for Capital Improvement Program, prepared by PG&E and dated February 2026 4. Preliminary Spillway Plan and Schedule for Spillway Remediation Projects 5. Summary of Interim Risk-Reduction Measures cc: via hard copy w/enclosures Erik Malvick, Ph.D., P.E., G.E., Division Manager Department of Water Resources, Division of Safety of Dams 2720 Gateway Oaks Drive, Suite 300 Sacramento, CA 95833 via secure file transfer w/enclosures Tim Jimenez, P.E., Central Regional Engineer Department of Water Resources, Division of Safety of Dams timothy.jimenez@water.ca.gov