Specifications include, but are not limited to: 1. Demolition of four existing riser columns: a. Work shall be done with the lift station in service and the level being pumped down by the existing pumps. b. Protect electrical and control devices in and around the wet well. c. Lock out and tag out the pumps as the riser pipes are being removed and installed. d. Remove approximately 50 ft of 8-inch and 12-inch pipe, 100 feet of 12-inch pipe, the removal will consist of piping going through 2-foot concrete wall into the dry well up to the plug valve ; 2. Installation of four new riser columns: a. Install 12-inch stainless, Schedule 40, #304 vertical and horizontal pipe from the base reducer to the plug valve in the dry well, penetrating a 2-foot concrete wall. b. Install 8-inch stainless, Schedule 40, #304 vertical and horizontal pipe from the base reducer to the plug valve in the dry well, penetrating a 2-foot concrete wall.