Specifications include, but are not limited to: The work includes improvements to the existing sedimentation basins at the Graham Hill Water Treatment Plant (GHWTP). Improvements include construction of the following items in accordance with the Drawings and Specifications: 1. Removal and replacement of tube settler modules for existing Sedimentation Basins No. 1 through No. 3. 2. Removal and replacement of sludge collection piping and valves for existing Sedimentation Basins No. 1 through No. 3. 3. Removal and replacement of troughs and weir plates for Basin No. 1. 4. Removal, replacement, survey and align effluent troughs in Basin No. 2 and No. 3 5. Providing trough stiffener system in effluent troughs 6. Cleaning, concrete patching and pressure-injecting cracks in concrete in existing Sedimentation Basins No. 1 through No. 3