Construction of the Durham WRRF Primary Sludge Pump Station Rehabilitation; Furnish all labor, materials, and equipment necessary to: 1. Demolish the existing sludge and scum pumps and associated process piping in the primary sludge pump station (PSPS) 3 and 4. 2. Install new progressive cavity sludge and scum pumps and associated process piping in PSPS 3 and 4. Primary clarifier 3 and 4 scum pits will include scum pit level sensors, local control stations, and scum pump automation. 3. Install a new progressive cavity sludge pump in PSPS 1 and 2. 4. Demolish the existing suction piping and isolation valves in PSPS 1 and 2. 5. Install new suction piping and isolation valves in PSPS 1 and 2. 6. Install variable frequency drives (VFD’s) on all existing and new primary sludge pumps. 7. Install an above-grade electrical room with heating, ventilation, and air conditioning system to support both PSPS 1 and 2 and PSPS 3 and 4 and all primary clarifier drive mechanisms.
