Specifications include, but are not limited to: Schedule #1 (Base Bid): The Base Bid includes the demolition of existing facilities, including removal of existing catwalk bridge deck, and construction of a new replacement catwalk concrete deck on top of existing structural steel members. Recondition and reuse of existing steel members, concrete pier rehabilitation, replacement of existing handrails, removal and replacement of low pressure and high pressure air piping and other process related improvements. Repair of underwater pipe encasement, installation and removal of all temporary working platforms and facilities, new gas service lines, and removal and replacement of electrical conduit. Schedule #2: The Schedule #2 bid includes demolition of existing facilities, including the existing intake building, removal of existing catwalk bridge deck, and construction of a new replacement catwalk concrete deck on top of existing structural steel members. Concrete pier rehabilitation and elevated structure modifications. Recondition and reuse of existing steel members, installation of new aluminum handrails on the catwalk and walkway around the intake building, steel staircase, removal and replacement of low pressure air piping and other process related improvements including gate actuator modifications and screen installation. Repair on underwater pipe encasement, installation and removal of all temporary working platforms and facilities. New precast concrete building and hollow core roof, associated mechanical, lifting hoists, removal and replacement of electrical conduit, conductors, and lighting.