The scope of work includes removal, legal disposal, and replacement of thirteen oxidation ditch rotors and related equipment. All equipment shall be from the single source supplier.; removal, legal disposal, and replacement of two grit screws located in the aerated grit chambers; removal, legal disposal, and replacement of approximately ten feet of process piping and associated fittings located at the grit dewatering equipment; and removal, legal disposal, and replacement of two sluice gates on the influent side of the ultraviolet disinfection equipment.