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HomeMy WebLinkAbout11.20.25 Board Correspondence - FW_ Dam Safety Compliance Report submitted in FERC P-803-000 by Pacific Gas and Electric Company,et al.From: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; Loeser, Kamie Cc:Nuzum, Danielle Subject:Board Correspondence - FW: Dam Safety Compliance Report submitted in FERC P-803-000 by Pacific Gas and Electric Company,et al. Date:Thursday, November 20, 2025 4:32:00 PM Please see Board Correspondence - -----Original Message----- From: 'FERC eSubscription' <eSubscription@ferc.gov> Sent: Thursday, November 20, 2025 11:15 AM Subject: Dam Safety Compliance Report submitted in FERC P-803-000 by Pacific Gas and Electric Company,et al. .ATTENTION: This message originated from outside Butte County. Please exercise judgment before opening attachments, clicking on links, or replying.. On 11/20/2025, 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-803-000 Lead Applicant: Pacific Gas and Electric Company Filing Type: Dam Safety Compliance Report Description: Pacific Gas and Electric Company submits updated resumes for quality-control field inspectors for the Weir Modification Project at the Philbrook Dam of the DeSabla-Centerville Hydroelectric Project under P-803. To view the document for this Filing, click here https://urldefense.com/v3/__https://elibrary.ferc.gov/eLibrary/filelist?accession_num=20251120- 5142__;!!KNMwiTCp4spf!COOFsQsjf2F4zdfvJwunlMkSf9zkPdhzroPGWAvwpgmE9qkIwOX52Wn8GA7I3hCOAxlWVv7dV1OeHoYrG64b92uEEQAzWrNIaZ7l$ To modify your subscriptions, click here: ------------------------------------------------------------------------ Please do not respond to this email. Online help is available here: https://urldefense.com/v3/__http://www.ferc.gov/efiling-help.asp__;!!KNMwiTCp4spf!COOFsQsjf2F4zdfvJwunlMkSf9zkPdhzroPGWAvwpgmE9qkIwOX52Wn8GA7I3hCOAxlWVv7dV1OeHoYrG64b92uEEQAzWvk4N6JS$ 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 November 20, 2025 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: DeSabla-Centerville Hydroelectric Project, FERC No. 803-CA Philbrook Dam, NATDAM No. CA00345 Weir Modification Project – Updated Resumes Dear Frank L. Blackett: This letter presents Pacific Gas and Electric Company’s (PG&E) updated resumes for the quality-control field inspectors for the weir modification project (project) at Philbrook Dam, which is part of PG&E’s DeSabla-Centerville Hydroelectric Project, Federal Energy Regulatory Commission (FERC) No. 803. PG&E submitted a construction authorization request to FERC on October 10, 2025. FERC provided authorization to proceed with the project in a letter to PG&E dated November 4, 2025. The enclosed resumes for James Layfield and Justin Welty (Enclosure 1), who will serve as senior civil inspectors for the project, will replace the senior civil inspector resume provided in the October 10, 2025, authorization request package. Should you have technical questions concerning this matter, please contact Isabelle Rawlings, senior dam safety engineer for PG&E, at (925) 359 -5420. For general questions, please contact Andrew Garcia, license coordinator for PG&E, at (530) 228-8990. Sincerely, Robert O. Ellis, P.E., G.E. Deputy Chief Dam Safety Engineer Enclosure: 1. Resume Replacements for Senior Civil Inspectors Document Accession #: 20251120-5142 Filed Date: 11/20/2025 ENCLOSURE 1 Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JAMES LAYFIELD SENIOR INSPECTOR Email: James.Layfield@pge.com Power Generation │ 12840 Bill Clark Way│ Auburn, CA 95602 Phone: 775-843-2085 1 CERTIFICATIONS • ACI – Field Testing Technician Grade 1 • Radiation Safety & Use of nuclear Soil Gauge Operator • ICC Spray Applied Fireproofing Special Inspector • ICC Structural Steel Special Inspector • ICC Structural Bolting Special Inspector • ICC Soils Special Inspector PROFESSIONAL SINCE: 2005 EDUCATION • Associate of Science, Truckee Meadows Community College • Associate of Arts, Truckee Meadows Community College • Senior Year, B.S. Geological Engineering, University of Nevada TRAINING • Introduction to Dams • PG&E Dam Safety Program • Basic Dam Surveillance & Monitoring • Basic Dam Inspections • Basic Dam Maintenance • Dam Surveillance and Monitoring • Inspection of Embankment Dams • Inspection of Concrete and Masonry Dams • Basic Rigging and hand signaling • Scaffolding safety, Competent Person Training • Safety at Heights, Competent Person Training. • Excavation Safety, Competent Person Training. • Confined Space, Competent Person Training • LOTO Trained • Radiation Safety Gauge Operator Training PROFESSIONAL SUMMARY Mr. Layfield has 19 years in the construction industry, with 10 years of inspection and construction experience with a large variety of PG&E Hydro projects. Experience includes: • Construction and maintenance related to powerhouses, switchyards, substations, conveyance, levee systems (e.g., penstocks, canals and canal liners, elevated steel structures, tunnels) • Maintenance of underground facilities, slope- stabilization/erosion protection, and roadway projects • Soils related inspection and testing services including vegetation/tree stump root removal, foundation/utility excavations both rock and soils, engineered fill/trench backfill placement, compaction verification with use of both nuclear gauge and sand-cone test methods • Drilling oversight related to piling/pier construction, and geotechnical investigations • Installation of rock anchors, tendons, soldier piles, soil nails, and retaining walls • Project site maintenance, SWPPP, and restoration • Performed construction engineering inspection and construction specifications including: - Concrete/shotcrete placement, sampling and testing - High-and-low pressure grouting operations and epoxy injection - Reinforcing steel placement - Structural steel erection including welding and high strength bolting - Post-installed anchors and dowels • Monitor construction progress, overall site safety, schedule and coordination Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JAMES LAYFIELD SENIOR INSPECTOR Email: James.Layfield@pge.com Power Generation │ 12840 Bill Clark Way│ Auburn, CA 95602 Phone: 775-843-2085 2 CERTIFICATIONS continue • ICC Reinforced Concrete Special Inspector • Construction Health and Safety Technician (CHST) • OSHA 510 Standards for Construction • OSHA 2264 Permit-Required Confined Space Entry • First-Aid/CPR/AED and Wilderness First-Aid/CPR/AED Certified • 30 Hour OSHA • 40 Hour Hazardous Waste Operations PROJECTS • Lake Fordyce Dam Seepage Mitigation 2025 PG&E SENIOR INSPECTOR The project scope consisted of improving the existing rockfill embankment, upstream, concrete-faced dam to reduce seepage. The dam is 145 feet high and 1,220 feet long. Appurtenant construction activities included: - Dredging and construction of the 350-foot-long rock-filled cofferdam - Geomembrane liner installation - Hard rock blasting - Rock crushing operations - Roadway improvements (8.5 miles) - Water bypass pumping and 60-inch HDPE gravity bypass - Water quality evaluation during construction activities - Geotechnical investigation Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Water bypass pumping - Year 2 geotechnical investigation – excavation and backfill of test pits at upstream dam toe - Geotechnical drilling including mud rotary, sonic, rock coring methods, and geophysical surveying - Geomembrane liner installation - Concrete coring on the dam face and patching - Soils compaction testing using standard test method for in-place density and water content by nuclear method - Plinth construction - Rock dowel installation and load testing Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JAMES LAYFIELD SENIOR INSPECTOR Email: James.Layfield@pge.com Power Generation │ 12840 Bill Clark Way│ Auburn, CA 95602 Phone: 775-843-2085 3 - Grout curtain construction and core drilling - Pressure grouting - Abandon original Low-Level Outlet (LLO) - Install weir - Sampling and testing concrete and grout materials - Compressive strength test specimens - Stop work authority • San Joaquin Ditch 2 Replace Canal 2024-2025 PG&E SENIOR INSPECTOR The project scope consisted of replacing approximately 250’ linear feet of existing damaged canal section on the San Joaquin 2 Conveyance System. Work included landslide mitigation, demolition/removal of the existing damaged canal section, realignment for new canal section and construction of both reinforced concrete canal sections and box flume. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Reinforcing steel placement - Post-installed anchors/rock bolts and dowels - Concrete placement, consolidation, and curing methods - Field sampling and testing of plastic concrete and grout for properties and compressive strength test specimens - Stop work authority • Coleman Forebay Seepage Mitigation 2024 PG&E SENIOR INSPECTOR Scope of work scope consisted of excavation and backfill of 600 linear feet approximately 14 to 20-foot-deep trench along the existing earthfill dam for installation of a new drainage collection system and weir construction. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QC, and specifications - Soils excavations - Engineered fill placement using ASTM D6938 for in-place density and water content by nuclear method - Concrete weir construction Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JAMES LAYFIELD SENIOR INSPECTOR Email: James.Layfield@pge.com Power Generation │ 12840 Bill Clark Way│ Auburn, CA 95602 Phone: 775-843-2085 4 - Stop work authority • PG&E Annual Canal Liner Improvement 2015–2016 KLEINFELDER SENIOR INSPECTOR The project scope consisted of replacing approximately 1,200’ linear feet of existing deteriorated canal liner on the Lower Drum Conveyance System, Bear River Canal. Work included construction of up-stream and down-stream tie-ins, expansion joints, transverse cut-off walls, weep holes, and installation of subdrains. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used, materials placed met the project design drawings, QC, and specifications - Water bypass pumping - Concrete demolition, upstream and downstream excavation for new liner tie-in - Subsurface preparation, subdrain and drain panel installation - Reinforcing steel replacement - Epoxy dowels/anchors - Shotcrete placement and curing - Field sampling and testing of plastic shotcrete for properties and compressive strength test specimens - Stop work authority • PG&E Barnard Alliance Team, Pipeline Safety Enhancement Plan (PSEP) 2013 - 2015 KLEINFELDER SENIOR INSPECTOR Project scope consisted of multiple gas pipeline improvement projects throughout PG&E’s line 400/401 transmission system. Work included improvements to PG&E’s high pressure gas lines up to 42-inch in diameter. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used, materials placed met the project design drawings, QC, and specifications - Reinforcing steel placement for foundations, thrust blocks, and pipe saddles - Steel pipe field welding in accordance with API and AWS D1.1 - Mechanical valve installation - Field sampling and testing of structural concrete for properties and compressive strength test specimens - Aggregate base and soils compaction testing using ASTM D6938 for in-place density and water content by nuclear method - Stop-work authority • Central Valley Gas Storage Facility 2010 - 2012 Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JAMES LAYFIELD SENIOR INSPECTOR Email: James.Layfield@pge.com Power Generation │ 12840 Bill Clark Way│ Auburn, CA 95602 Phone: 775-843-2085 5 KLEINFELDER SENIOR INSPECTOR Project scope consisted of construction of a new compressor station, metering station, and commissioning approximately 15 miles of high pressure 24-inch pipeline to connect the storage field to PG&E’s transmission system. Responsibilities included inspection for compliance with project drawings, quality assurance inspection program, and contract specification for: - Inspection verification of means and methods used, materials placed met the project design drawings, QA, and specifications - Reinforcing steel placement for foundations, thrust blocks, and pipe saddles - Epoxy dowels/anchors - Structural steel and pipeline field welding in accordance with API and AWS D1.1 - Field sampling and testing of structural concrete for properties and compressive strength test specimens - Industrial painting and coatings - Aggregate base and soils compaction testing using ASTM D6938 for in-place density and water content by nuclear method - Stop-work authority • Vineyard Surface Water Treatment Plant 2008 - 2010 KLEINFELDER SENIOR INSPECTOR Project scope consisted of construction of the new 50mgd water treatment facility, including underground reinforced concrete holding tanks, 66-inch ML/DCS lined steel pipelines, mechanical appurtenances, and Sacramento County Water Agency (SCWA) administrative buildings/corporation yard. Responsibilities included inspection for compliance with project drawings, quality assurance inspection program, and contract specification for: - Inspection verification of means and methods used, materials placed met the project design drawings, QA, and specifications - Reinforcing steel placement for structural concrete - Epoxy dowels/anchors - Structural steel and pipeline field welding in accordance with AWWA and AWS D1.1 - Field sampling and testing of structural concrete for properties and compressive strength test specimens - Aggregate base and soils compaction testing using ASTM D6938 for in-place density and water content by nuclear method Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 1 CERTIFICATIONS • ACI Field Testing Tech Grade I • ACI Adhesive Anchor Installation Inspector • American Heart Association First Aid CPR/AED • OSHA SA1 (Safety Associate 1) PROFESSIONAL SINCE: 1997 TRAINING • Introduction to Dams • PG&E Dam Safety Program • Basic Dam Surveillance & Monitoring • Basic Dam Inspections • Basic Dam Maintenance • Dam Surveillance and Monitoring • Inspection of Embankment Dams • Inspection of Concrete and Masonry Dams • Excavation Safety, Competent Person Training • Scaffolding Safety, Competent Person Training • SWPPP Operations Training • Safety at Heights, competent person training • Confined Space, competent person training PROFESSIONAL SUMMARY Mr. Welty has 28 years of inspection and construction experience with a large variety of PG&E hydro projects. Experience includes: • Performing construction inspection activities on both formal and informal projects in compliance with PG&E, FERC, and North American Electric Reliability Corporation (NERC) standards • Working with the project design teams, including engineers of record and project managers, to communicate and track design changes, project schedules and budget • Understanding and implementing project specifications • Soils related inspection and testing services including vegetation/tree stump root removal, foundation/utility excavations both rock and soils, engineered fill/trench backfill placement, compaction verification with use of both nuclear gauge and sand-cone test methods • Performed construction engineering inspection and construction specifications including: - Concrete/shotcrete placement, sampling and testing - High-and-low pressure grouting operations and epoxy injection - Reinforcing steel placement - Structural steel erection including high strength bolting - Post-installed anchors and dowels - Appurtenant construction related to concrete coring/cutting, demolition and repairs • Verifying daily compliance with all project permits, inspection and document storm water pollution prevention, and best management practices; communicating necessary adjustments with the project team; and ensuring the appropriate changes are made in a timely manner Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 2 CERTIFICATIONS continued • 40-hour HAZMAT Certificate of Completion • Certified ROV Operator • Radiation Safety and Nuclear Gauge/CPN • OSHA-3095 Electrical Standards • OSHA-2264 Permit Required Confined Space • OSHA-500 Trainer Course in OSHA Standards for Construction Industry • OSHA-3115 Fall Protection • OSHA-7845 Record Keeping • OSHA-5109 Cal/OSHA Standards for the Construction Industry • OSHA-3015 Excavation, Trenching & Soil Mechanics • OSHA-510 OSHA Standards for Construction Industry PROJECTS. • Lake Fordyce Dam Seepage Mitigation 2024–2025 PG&E SENIOR INSPECTOR The project scope consisted of improving the existing rockfill embankment, upstream, concrete-faced dam to reduce seepage. The dam is 145 feet high and 1,220 feet long. Appurtenant construction activities included: - Dredging and construction of the 350-foot-long rock-filled cofferdam - Geomembrane liner installation - Hard rock blasting - Rock crushing operations - Roadway improvements (8.5 miles) - Water bypass pumping and 60-inch HDPE gravity bypass - Water quality evaluation during construction activities - Geotechnical investigation Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Water bypass pumping - Year 2 geotechnical investigation – excavation and backfill of test pits at upstream dam toe - Geotechnical drilling including mud rotary, sonic, rock coring methods, and geophysical surveying - Geomembrane liner installation - Concrete coring on the dam face and patching - Soils compaction testing using standard test method for in-place density and water content by nuclear method Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 3 - Plinth construction - Rock dowel installation and load testing - Grout curtain construction and core drilling - Pressure grouting - Abandon original Low-Level Outlet (LLO) - Install weir - Sampling and testing concrete and grout materials - Compressive strength test specimens - Stop work authority • Upper Peak Dam and Spillway Repair 2022 PG&E SENIOR INSPECTOR The project scope consisted of improving the existing earthfill, drystone masonry dam and mortared rock, masonry spillway channel. Work included armoring the banks of the existing spill channel with rock slope protection (RSP) to protect against designed probable maximum flood (PMF) and removing and backfilling of trees, stumps, and roots from the channel banks and dam toe. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Water bypass pumping - Spillway channel excavation - RSP placement - Tree stump/root removal and backfill - Soils compaction testing using both ASTM D6938 for in-place density and water content by nuclear method and ASTM D1556 for density and unit weight of soil in place by sand-cone methods • Lake Fordyce Dam Seepage Mitigation 2021–2022 PG&E SENIOR INSPECTOR The project scope consisted of improving the existing rockfill embankment, upstream, concrete-faced dam to reduce seepage. The dam is 145 feet high and 1,220 feet long. Appurtenant construction activities included: - Dredging related to the temporary 300-foot-long cofferdam - Roadway improvements (8.5 miles) - Water bypass pumping - Water quality evaluation during construction activities - Geotechnical investigation Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 4 - Water bypass pumping - Year 1 geotechnical investigation – excavation and backfill of test pits at upstream dam toe - Concrete coring on the dam face and patching - Soils compaction testing using standard test method for in-place density and water content by nuclear method - Sampling and testing concrete - Compressive strength test specimens • North Battle Creek Dam Spillway Repair 2022 PG&E SENIOR INSPECTOR The project scope consisted of removal and replacement of damaged reinforced concrete sections and expansion joint repairs. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Water bypass pumping - Spillway concrete demolition and excavation - Reinforcing steel placement - Post-installed anchors and dowels - Field sampling and testing of plastic concrete and grout for properties and compressive strength test specimens - Stop-work authority • MaCumber Dam Spillway Repair 2022 PG&E SENIOR INSPECTOR The project scope consisted of removal and replacement of damaged reinforced concrete sections and expansion joint repairs. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Spillway concrete demolition and excavation - Reinforcing steel placement - Post-installed anchors and dowels - Field sampling and testing of plastic concrete and grout for properties and compressive strength test specimens Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 5 - Stop-work authority • Belden Dam Spillway 2020 Interim Repairs 2021 PG&E SENIOR INSPECTOR The project scope consisted of improving the existing earthfill dam, concrete spillway, and plunge pool. Work included excavations along the existing concrete spillway structure training walls and flip bucket, construction of a structurally reinforced concrete cutoff wall, armoring of the banks of the existing spill channel and plunge pool with shotcrete, and backfill of the annular space with concrete grout. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Water bypass pumping - Spillway channel excavation - Reinforcing steel placement - Post-installed anchors and dowels - Field sampling and testing of plastic concrete and grout for properties and compressive strength test specimens • Grizzly Forebay Debris Removal Dredging 2020 PG&E SENIOR INSPECTOR The project scope consisted of dredging operations. Responsibilities included: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Maintaining daily reservoir elevations through barge-mounted pumping system, visual turbidity inspections, field reports and engineering oversight of Contractors - Ensuring implementation of marine safety requirements per submitted barge safety plans and OSHA - Testing oversight performed by dive contractor to retrieve sediment samples and ensuring chain of custody is signed for and transported per specifications - Ensuring bathymetric survey is adhered to for sediment dredging - Dredge spoils grading and management - Oversight of storm water pollution prevention and water quality control requirements Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 6 • Poe Tunnel Liner Improvement 2019–2020 PG&E SENIOR INSPECTOR The project scope consisted of repairing an approximately 170-linear-foot section of structural shotcrete on the original 19-foot-diameter Poe tunnel constructed in the 1950s. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Verification of underground rock drilling - Low-pressure contact grouting - Subdrain installation - Reinforcing steel and anchorage for shotcrete liner construction - Adit door repairs, including door seals, gasket replacement, and bolting - Industrial coatings - Helicopter operations - Underground/tunnel work/tunnel safety orders • Upper Drum Area Spillway Patching at Various Dams 2018 - 2020 PG&E SENIOR INSPECTOR The project scope consisted of restoration and maintenance of various spillways within the Upper Drum area including Upper Peak, Upper Rock, Fuller, Halsey, and Upper Wise dams. Work included removal and replacement of damaged reinforced concrete sections, grout patching, and expansion joint repairs. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Water bypass pumping - Spillway concrete demolition and excavation - Subdrain excavation, installation, and backfill - Reinforcing steel placement - Post-installed anchors and dowels - Field sampling and testing of plastic concrete and grout for properties and compressive strength test specimens Document Accession #: 20251120-5142 Filed Date: 11/20/2025 JUSTIN WELTY SENIOR INSPECTOR Email: justin.welty@pge.com Power Generation │ 300 Lakeside Drive │ Oakland, CA 94612 Phone: 530-906-6025 7 • Helms Pump Storage PH Penstock Access Tunnel Plug Leakage 2017–2018 PG&E SENIOR INSPECTOR The project scope consisted of repairing an approximately 270-linear-foot section of structural shotcrete on the original 30-foot-diameter Helms Powerhouse bypass tunnel and penstock access tunnel, constructing a waterproof geomembrane (Carpi) liner, and other leakage mitigation. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Drilling underground rock - Installing rock anchors and proof load testing - High-pressure grouting - Installing subdrain, piezometer, and concrete weir - Installation of reinforcement anchors and reinforcement steel - Installation of shotcrete - Constructing waterproof geomembrane (carpi) liner - Completing activities related to appurtenant tunneling construction • Pit 6 Spillway Repair 2017 PG&E SENIOR INSPECTOR The project scope consisted of improving the existing concrete dam, concrete spillway, and plunge pool. Work included excavations along the existing concrete spillway structure training walls and flip bucket, construction of a structurally reinforced concrete cutoff wall, armoring of the banks of the existing spill channel and plunge pool with reinforced concrete, and backfill of the annular space with concrete grout. Responsibilities included inspection for compliance with project drawings, quality control inspection program, and contract specification for: - Inspection verification of means and methods used and whether materials placed met the project design drawings, QCIP, and specifications - Water bypass pumping - Coffer dam construction - Spillway channel excavation - Reinforcing steel placement - Post-installed anchors and dowels - Field sampling and testing of plastic concrete and grout for properties and compressive strength test specimens Document Accession #: 20251120-5142 Filed Date: 11/20/2025 Document Content(s) PGE20251120_803_Philbrook_WeirMod_UpdInspRes.pdf .........................1 Document Accession #: 20251120-5142 Filed Date: 11/20/2025