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This document provides details for a federal construction solicitation for repair work on a hydroelectric turbine generator unit. The U.S. Army Corps of Engineers, Walla Walla District is seeking bids to repair a failed seal between the runner hub and turbine shaft connection at the Lower Monumental Dam in Washington. The scope of work involves sealing the outer diameter of the shaft flange where it meets the hub, adding welded caps to coupling bolts, and installing piping and containment for leaking oil. Optional work may include new blade seals and a nose cone gasket. The project is estimated to cost between $250,000 and $500,000 and must be completed within 150 calendar days of the notice to proceed. The solicitation will be issued as an invitation for bids requiring performance and payment bonds. The bidding process is open to all large and small businesses and will follow Federal Acquisition Regulation Part 14 for definitive responsibility criteria.