P-381 MULTI-MISSION DRY DOCK #1, PORTSMOUTH NAVAL SHIPYARD (PNSY), KITTERY MAINE

This project constructs a partitioned addition to Dry Dock #1 within the super-flood basin area. The addition will consist of two bays, labeled Dry Dock #1 North and Dry Dock #1 West. The existing Dry Dock #1 will be renamed Dry Dock #1 East. Both Dry Dock #1 North and Dry Dock #1 West will be of sufficient size and depth to support the maintenance and overhaul of Virginia Class submarines, Blocks I-IV.  New construction will include concrete floors, walls, and center wall separating Dry Dock #1 North and Dry Dock #1 West, new pump well systems, pump station building, two caissons, portal crane rails, mooring hardware, mechanical and electrical utilities, utility tunnels, and all appurtenances required to ensure an operational dry dock. Modifications will be made to the existing basin closure wall and to Berths 1 and 11 to prevent undermining and support fully dewatered conditions. The existing Dry Dock #1 pumpwell will be connected to the new pumpwell system and the interior will be modified. The facility will include basic telephone, computer network, fiber optic, closed-circuit television security system, utility metering, and fire alarm