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HomeMy WebLinkAbout09.21.20 Email from FERG Project Safety Compliance Report PGE2020-0921_619_LowerBucksDam_MSR_August From:Schuman, Amy To:Alpert, Bruce;Bennett, Robin;Clerk of the Board;Connelly, Bill;Cook, Holly;Lambert, Steve;Lucero, Debra;McCracken, Shari;Paulsen, Shaina;Pickett, Andy;Ring, Brian;Ritter, Tami; Rodas, Amalia;Sweeney, Kathleen;Teeter, Doug Subject:Board Correspondence - FW: Project Safety Compliance Report submitted in FERC P-619-000 by Pacific Gas and Electric Company,et al. Date:Monday, September 21, 2020 3:36:22 PM Good afternoon, Please see the email below from FERC. Amy Schuman Associate Clerk of the Board Butte County Administration 25 County Center Drive, Suite 200, Oroville, CA 95965 O: 530.552.3300 |D: 530.552.3308 | F: 530.538.7120 Twitter | Facebook | YouTube | Pinterest -----Original Message----- From: 'FERC eSubscription' <eSubscription@ferc.gov> Sent: Monday, September 21, 2020 3:25 PM Subject: Project Safety Compliance Report submitted in FERC P-619-000 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 9/21/2020, 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: Alabama Power Company Filing Type: Project Safety Compliance Report Description: Monthly Construction Status Report No. 4 - Lower Bucks Dam Upstream Geomembrane Project re the Bucks Creek-Grizzly Hydro Project of Pacific Gas and Electric Company under P-619. To view the document for this Filing, click here https://urldefense.com/v3/__https://elibrary.ferc.gov/eLibrary/filelist?accession_num=20200921- 5190__;!!KNMwiTCp4spf!RmVUratl2VDrvaQ0e1VK_tr0fVy98aD45IsrBUSrZPVlvNXyMk5MAw9vTWI6jH1f-sUxeih67ds$ To modify your subscriptions, click here: https://urldefense.com/v3/__https://ferconline.ferc.gov/eSubscription.aspx__;!!KNMwiTCp4spf!RmVUratl2VDrvaQ0e1VK_tr0fVy98aD45IsrBUSrZPVlvNXyMk5MAw9vTWI6jH1f- sUx4x5Cey0$ ------------------------------------------------------------------------ Please do not respond to this email. Online help is available here: https://urldefense.com/v3/__http://www.ferc.gov/efiling-help.asp__;!!KNMwiTCp4spf!RmVUratl2VDrvaQ0e1VK_tr0fVy98aD45IsrBUSrZPVlvNXyMk5MAw9vTWI6jH1f- sUxZ1hqK9A$ or for phone support, call 866-208-3676. 245 Market Street tƚǞĻƩ DĻƓĻƩğƷźƚƓ San Francisco, CA 94105 Mailing Address: Mail Code N11D P.O. Box 770000 San Francisco, CA 94177 September 21, 2020 Via Electronic Submittal (E-File) Mr. 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 RE: Bucks Creek-Grizzly Hydroelectric Project (FERC No. 619) Monthly Construction Status Report No. 4 Lower Bucks Dam Upstream Geomembrane Project Dear Mr. Blackett: This letter presents Pacific Gas and Monthly Construction Status Report for the Lower Bucks Dam Upstream Geomembrane Project Bucks Creek-Grizzly Hydroelectric Project (FERC No. 619). A May 7, 2020 letter from the Federal Energy Regulatory Commission (FERC) provided PG&E authorization to proceed with the project and also requested that PG&E file monthly reports to document the progress of construction. Enclosed you will find a copy of the fourth monthly construction report for the Lower Bucks Dam Upstream Geomembrane Project, which details the construction activities during the month of August 2020. Senior Project Engineer, Jeff Jukkola, at (530) 624-8640. For general questions, please Jamie Visinoni, at (530) 215-6676. Sincerely, Elisabeth Rossi Supervisor, Hydro Licensing Enclosure LOWER BUCKS DAM UPSTREAM GEOMEMBRANE PROJECT BUCKS CREEK HYDROELECTRIC PROJECT - FERC NO. 619 CONSTRUCTION MONTHLY STATUS REPORT NO. 4 SEPTEMBER 2020 PREPARED BY: JEFF JUKKOLA, PE POWER GENERATION DEPARTMENT DATE: SEPTEMBER 17, 2020 Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report TABLE OF CONTENTS PAGE I. PROGRESS OF WORK 1 II. STATUS OF CONSTRUCTION 5 III. CONSTRUCTION DIFFICULTIES 5 IV. CONTRACT STATUS 5 V. CRITICAL EVENTS AND DATES 6 VI. FOUNDATIONS 6 VII. SOURCES OF MAJOR CONSTRUCTION MATERIALS 6 VIII. MATERIALS TESTING AND RESULTS 6 IX. INSTRUMENTATION 7 X. PHOTOGRAPHS 7 XI. EROSION CONTROL AND OTHER ENVIRONMENTAL MEASURES 7 XII. OTHER ITEMS 7 APPENDICES A. Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report I.PROGRESS OF WORK During the fourth month of construction, the following major items of work were performed for the project: Continued dewatering of Lower Bucks from shore-based pumps Development of the reservoir access road on the north shore to the right abutment. Development of access and excavation on the south shore to the left abutment. Completion and usage of dewatering filtration system Mobilization of an Active Treatment System (ATS) to support further dewatering A more detailed breakdown of the work performed onsite during the reporting period is further described below: Week Starting 8/3/20 Continued pumping to dewater reservoir. End of week water surface elevation was 4958.5’ Carpi Geomembrane Liner Progress: Carpi Geomembrane Liner Progress (8/3 - 8/9) Tasks Percent Complete Geocomposite Delivery 100% GeoNet Delivery 100% Fastening Materials Delivery 100% Mobilization 100% Drilling Top Seal89% Completing Top Seal 62% Drilling Top Submersible Seal 11% Completing Top Submersible Seal 0% Internal Tensioning Profiles 38% Geonet 29% Geomembrane Face22% External Tensioning Profiles 4% Weld Cover Strips Tensioning Profiles 0% Drainage Plates 0% Drilling Submersible Seal 17% Completing Submersible Seal 0% Demobilization 0% Overall weighted completion 28% Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report Week Starting 8/10/10 Continued pumping to dewater reservoir. End of week water surface elevation was 4958.4 Carpi Geomembrane Liner Progress: Carpi Geomembrane Liner Progress (8/10 - 8/16) Tasks Percent Complete Geocomposite Delivery 100% GeoNet Delivery 100% Fastening Materials Delivery 100% Mobilization 100% Drilling Top Seal 89% Completing Top Seal 62% Drilling Top Submersible Seal 50% Completing Top Submersible Seal 0% Internal Tensioning Profiles 62% Geonet 41% Geomembrane Face 28% External Tensioning Profiles 8% Weld Cover Strips Tensioning Profiles0% Drainage Plates0% Drilling Submersible Seal 17% Completing Submersible Seal 0% Demobilization 0% Overall weighted completion 35% Week Starting 8/17/20 Continued pumping to dewater reservoir. Bucks Storage Flows blended with Pumping/Filtration from Lower Bucks to keep turbidity within compliance. Approximate blend is 1 cfs from Lower Bucks to 8 cfs from Bucks Lake. Lighting complex fires begin in the project area on 8/20. End of week water surface elevation was 4957.2 Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report Carpi Geomembrane Liner Progress: Carpi Geomembrane Liner Progress (8/17 - 8/23) Tasks Percent Complete Geocomposite Delivery100% GeoNet Delivery 100% Fastening Materials Delivery 100% Mobilization 100% Drilling Top Seal 89% Completing Top Seal 82% Drilling Top Submersible Seal 64% Completing Top Submersible Seal 0% Internal Tensioning Profiles 62% Geonet 48% Geomembrane Face 47% External Tensioning Profiles 13% Weld Cover Strips Tensioning Profiles0% Drainage Plates0% Drilling Submersible Seal 19% Completing Submersible Seal 0% Demobilization 0% Overall weighted completion 44% Week Starting 8/24/20 Dewatering from Lower Bucks has stopped due to challenges with turbidity. Project team is making application for an Active Treatment System utilizing flocculent to treat water. On 8/26, project team switched to the backup water supply from Three Lakes due to concerns with the Bucks Lake bypass source conveyance being vulnerable to fire, constructed of HDPE and approximately two miles in length. MC Environmental Services mobilization to site to set up ATS End of week water surface elevation was 4957.3 Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report Carpi Geomembrane Liner Progress: Carpi Geomembrane Liner Progress (8/24 - 8/30) Tasks Percent Complete Geocomposite Delivery 100% GeoNet Delivery 100% Fastening Materials Delivery 100% Mobilization 100% Drilling Top Seal100% Completing Top Seal 100% Drilling Top Submersible Seal 64% Completing Top Submersible Seal 0% Internal Tensioning Profiles 79% Geonet 60% Geomembrane Face 59% External Tensioning Profiles 31% Weld Cover Strips Tensioning Profiles15% Drainage Plates0% Drilling Submersible Seal 19% Completing Submersible Seal 0% Demobilization 0% Overall weighted completion 52% Week Starting 8/31/20 On 9/1, fire danger appeared stable, so IFR water delivery was switched back to Bucks Storage flows with potential to blend with pumping/filtration/ATS from Lower Bucks for Pumping/Filtration/ATS. Note: Bucks Storage Water recording higher turbidity. Project Engineer believes this may be due to ash. On 9/4, pumping commenced using the ATS. System functioning as planned with favorable turbidity and pH results. End of week water surface elevation was 4957.5 Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report II. STATUS OF CONSTRUCTION Throughout the month of August, construction has been held up due to issues with dewatering. Due to challenges with turbidity and reduced pumping, construction is several weeks behind schedule. III. CONSTRUCTION DIFFICULTIES The Bear Fire/North Complex is located on the Mt. Hough Ranger District on the Plumas National Forest and consists of numerous lightning fires being managed as one incident. The fires were ignited during a lightning storm that moved over the Plumas National Forest on the morning of August 17, 2020. The fire exists in remote areas southeast of Bucks Lake about 4 miles and mostly on the north side of the Middle ForkFeather River. An Evacuation Advisory has been in place (effective 0900 on Aug 26) for the Bucks Lake area. Turbidity in the reservoir has caused the dewatering activity to reduce, and eventually stop in late August. The project team hired MC Environmental Services to support the permitting process and implementation of an Active Treatment System (ATS). The intent of the ATS will support removing turbidity from the water allowing pumping to continue and the dewatering effort to proceed. IV. CONTRACT STATUS PG&E GC is the prime contractor on the project. Traditional expertise and equipment are being used for the project. Rain for Rent is supporting the gravity bypass pipe, dewatering pumps, and filtration system construction and maintenance. Rain for Rent is subcontracting to MC Environmental Services for installation, operation and reporting of the ATS. Carpi USA Inc is responsible for the geomembrane liner. Mead & Hunt (M&H) are the EOR for the overall project, providing technical support and is performing site visits during key elements of construction related to dam safety. Ballard Marine is off site until the cofferdam is fully exposed. Ballard and Schnabel will support maintenance and acceptance activities prior to allowing any workers below the cofferdam. Ballard is subcontracting toSummit Crane (Summit) for crane support, to Schnabel Engineering as the cofferdam Engineer of Record (EOR), and to Art Anderson as the Marine Architect supporting barge stability analysis, mooring, etc. Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report V. CRITICAL EVENTS AND DATES Construction work continues through the reporting period. The following important dates are noted below; MAJOR MILESTONE BASELINE FORECAST ACTUAL Construction Kickoff Meeting4/30/204/30/20 ERTC Issued 5/1/20 5/1/20 All Permits / Concurrence Issued Milestone (FERC) 5/1/20 5/7/20 Begin Mobilization Milestone 5/4/20 5/4/20 Milk Ranch -Install New T and Valves Complete5/18/205/27/20 Bypass Pipeline & Discharge Complete 5/28/20 6/24/20 Barge Pump System Setup Complete 5/28/20 6/9/20 Cofferdam Install Complete 5/28/20 6/18/20 Carpi USA -Liner Installation Mobilization 6/7/20 6/15/20 Filtration System Setup Complete 6/13/20 7/28/20 Nuisance Water System Setup Complete 7/19/20 7/28/20 Draw down of Reservoir Complete 7/19/20 10/1/20 Lakebed Access Roads Start 7/19/20 7/8/20 Sediment Removal at Dam Face Start 8/19/20 7/11/20 Sediment Removal Complete 9/10/20 10/19/20 Sediment Off Haul Complete 9/20/20 10/17/20 Liner Installation Complete 10/7/20 10/7/20 Rewater Reservoir Start 10/8/20 10/15/20 Site Restoration Complete 11/20/20 11/20/20 Demobilize11/30/20 11/30/20 RTS 11/30/20 11/30/20 VI. FOUNDATIONS There is no foundation work to report during this period. VII.SOURCES OF MAJOR CONSTRUCTION MATERIALS There are no major construction materials to report during this period. VIII. MATERIALS TESTING AND RESULTS There is no material testing to report during this period. Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report IX. INSTRUMENTATION No permanent instrumentation is being installed as part of this project. Temporary turbidity monitors have been installed for the duration of the project to monitor baseline for comparison to a downstream compliance point. Within the temporary IFR bypass line, instrumentation has been installed to record turbidity, flow and temperature. PG&E typically monitors flow through the LLO at Lower Bucks Dam using an Acoustic Velocity Pipe Flow Meter (AVM) referred to as NF82. Lower Bucks will be temporarily dewatered during the project, the LLO will not be operational, and IFR deliveries will be routed around the lake and into Bucks Creek downstream of Lower Bucks Dam. Data continuity is provided by a temporary stage monitor, located in Bucks Creek downstream of the dam, referred to as NF118. The gage logs 15-minute record and transmits polls in 5-minute intervals to the Rock Creek Operators Board. The site was rated using the AVM, from 0-130 cfs. X. PHOTOGRAPHS Periodic progress photographs have been taken of work to date. These are generalphotos are taken during the reporting period and included in Appendix A. XI. EROSION CONTROL AND OTHER ENVIRONMENTAL MEASURES Typical best management practices (BMPs) have been placed around the perimeter of the primary staging area andwork sites, including gravel bags, and straw wattles. There have been no instances where sediments or construction materials have left the site nor entered the reservoir or downstream channel. XII. OTHER ITEMS There are no other significant events to report during this period. Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report APPENDIX A CONSTRUCTION PHOTOGRAPHS Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/3/2020: Installing temporary rockfall netting to mitigate risks of rock hazards to liner contractor at right abutment. Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/9/2020: GC began excavations on the south side of the dam. 8/12/2020: Filtration pumps and cofferdam starting to show. Gas trapped under pond liner. Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/15/2020:Looking downstream at the upstream face. Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/18/2020: Scaffolding at right abutment to support liner installation. Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/125/2020:Capri placing inner profiles down to water elevation. Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/26/2020: GC excavating on the southern abutment near service spillway. 8/27/2020: Progress of liner placement. Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/29/2020:GC continued excavations Appendix A – Construction Photographs Lower Bucks Dam Upstream Geomembrane Project – FERC Project No. 619 September 2020 - Construction Status Report 8/31/2020: Continued liner placement and left abutment excavations. Appendix A – Construction Photographs From:Schuman, Amy To:BOS Subject:Board Correspondence - FW: Project Safety Compliance Report submitted in FERC P-619-000 by Pacific Gas and Electric Company,et al. Date:Monday, September 21, 2020 3:36:22 PM Good afternoon, Please see the email below from FERC. Amy Schuman Associate Clerk of the Board Butte County Administration 25 County Center Drive, Suite 200, Oroville, CA 95965 O: 530.552.3300 |D: 530.552.3308 | F: 530.538.7120 Twitter | Facebook | YouTube | Pinterest -----Original Message----- From: 'FERC eSubscription' <eSubscription@ferc.gov> Sent: Monday, September 21, 2020 3:25 PM Subject: Project Safety Compliance Report submitted in FERC P-619-000 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 9/21/2020, 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: Alabama Power Company Filing Type: Project Safety Compliance Report Description: Monthly Construction Status Report No. 4 - Lower Bucks Dam Upstream Geomembrane Project re the Bucks Creek-Grizzly Hydro Project of Pacific Gas and Electric Company under P-619. To view the document for this Filing, click here https://urldefense.com/v3/__https://elibrary.ferc.gov/eLibrary/filelist?accession_num=20200921- 5190__;!!KNMwiTCp4spf!RmVUratl2VDrvaQ0e1VK_tr0fVy98aD45IsrBUSrZPVlvNXyMk5MAw9vTWI6jH1f-sUxeih67ds$ To modify your subscriptions, click here: https://urldefense.com/v3/__https://ferconline.ferc.gov/eSubscription.aspx__;!!KNMwiTCp4spf!RmVUratl2VDrvaQ0e1VK_tr0fVy98aD45IsrBUSrZPVlvNXyMk5MAw9vTWI6jH1f- sUx4x5Cey0$ ------------------------------------------------------------------------ Please do not respond to this email. Online help is available here: https://urldefense.com/v3/__http://www.ferc.gov/efiling-help.asp__;!!KNMwiTCp4spf!RmVUratl2VDrvaQ0e1VK_tr0fVy98aD45IsrBUSrZPVlvNXyMk5MAw9vTWI6jH1f- sUxZ1hqK9A$ or for phone support, call 866-208-3676.