Lamoille County
Bid Date: 04/25/2025 at 11:00am
Trades: *A&E Architecture & Engineering: Consulting & Design Services: Professional, EOR Services, Feasibility Study, *Construction Management; General Contractor "CMGC", Construction Manager-as-Constructor "CMaC", & Construction Administration, *At Risk Construction Management CMaR, Design/Build Contractor; Design/Bid/Build Entity (DBBE)
In Jul 2023, the circa 1920 Pottersville (Wolcott) Dam hydropower building housing the 800kW Kaplan vertical turbine generator flooded approximately 90 IN high that substantially damaged the facility. The pre-FIRM facility is in a Special Flood Hazard Area (SFHA). The 2023 flood damaged hydropower equipment are nearly repaired. The initial mitigation measure constructed a new mezzanine to elevate the power controls and electrical equipment. Currently, HED needs to Study options for mitigation of the building and turbine-generator equipment. HED with consultation from the State of Vermont Floodplain Coordinator would like to explore an engineering feasibility study to “wet floodproofing” the building and “dry floodproofing” the turbine generator equipment. For purposes of the FEMA Public Assistance grant application, this building/equipment mitigation study needs to be tracked separately from the following 2024 damaged penstock study. The FEMA PA 2023 project numbers are 726491 (building) and 736479 (turbine-generator equipment). In Jul 2024, the Wolcott Dam hydropower penstocks were damaged by extensive flooding that for the second year overtopped the flood protection wall during a time when the 800kW hydropower plant was taken offline for the 2023 repairs of flood damaged Kaplan vertical turbine generator. The penstocks were void of water flow and show evidence the penstocks floated off their supporting saddles, dislodged, and are physically damaged because of the 2024 event. Both flooding events were declared federal disasters. This FEMA PA 2024 project number is 759590 (penstocks). THE PROPOSED engineering feasibility study will have two components that FEMA has requested HED track separately for purposes of federal funds including engineering fees: The 2023 damaged Building & Equipment, and The 2024 damaged Penstocks. It is intended the same engineering firm will study the mitigation options for both components concurrently. Initially, the selected engineering firm will (1) prepare for and then (2) participate in a Kickoff Meeting for the feasibility study with HED representatives (Applicant) and FEMA. (1) Preparation e?orts will include the engineering team conducting a thorough on-site field inspection of the hydropower plant, including an external and internal penstock survey (confined space), from upstream reservoir through surge tower, to under building water channel to the turbine, and tailrace tunnel to the downstream reservoir. Then prepare documentation of the existing conditions. Distribute the engineer’s existing condition survey to the Applicant and designated team members. (2) Participate in a pre-Kickoff Meeting to review inspection findings and to establish an agenda of the feasibility study for discussion at the Kickoff Meeting with the many stakeholders. In addition to the HED representatives, FEMA PA and state representatives that may include FEMA program delivery manager (PDMG), FEMA environmental/historic preservation (EHP), FEMA 406 Mitigation, State of Vermont DEC Floodplain Coordinator, and State of Vermont Emergency Management Coordinator. At the Kickoff Meeting, the engineering team will make a presentation of the existing condition study findings and explore the stakeholder’s expectations for mitigation options in the feasibility study. The feasibility study will include the engineer’s preliminary opinion of costs for each reasonable flood mitigation option(s) to minimize future flooding of the two components of the hydropower plant – Building/Equipment and Penstocks. At the conclusion of the feasibility study, HED will decide how to proceed. The next phase after the feasibility study is to prepare public bidding documents (plans and specifications) of the owner selected final design. Followed by public bidding and construction administration of the contract award.
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Owner: Hardwick Electric Dept VT
Published 04/07/2025 on Construction Bid Source
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