NPE-3 & NSE-3 CLOSURES
Adult Fishway Entrances NSE-3 and NPE-3 were permanently sealed with reinforced self-consolidating concrete at Lower Granite Dam. These openings are side entrances to the adult ladder that are no longer used. The two entrances are partially under water so it is expected these areas will require dewatering to facilitate installation of concrete steel reinforcement and concrete. The steel reinforcement and anchorage requirements will be provided by the Government.
Newalen, LLC removed and disposed of the existing composite concrete/steel bulkheads located at the NSE-3 and NPE-3 locations.
Newalen, LLC designed, fabricated and installed, removing two steel bulkheads necessary to dewater the NSE-3 and NPE-3 entrances using the Government provided load cases stated in the upcoming solicitation. The maximum head on the gates, due to concrete loading, is 28 feet. The opening the bulkheads are to be placed over is approximately 7 feet wide by 12 feet high. The bulkheads will consist of bolted connections (no weld connections) and the Contractor is responsible for anchoring the bulkheads to the entrances using divers.
TITAN provided a Quality Control Manager to the project.