The Detroit Water and Sewerage Department (DWSD) owns and operates two raw sewage-pumping stations at the Detroit Wastewater Treatment Plant (WWTP). Main Influent Pump Station No. 1 (PS-1) was constructed in the late 1930s. PS-1 receives flow from the Jefferson Avenue Interceptor (16-feet in diameter) and the Oakwood Interceptor (12.5-feet in diameter). Flow from the two interceptors enters a divided wet well, with each wet well having four pumps.
PS-1 consists of eight constant speed pumps of varying capacities. The original design capacity of all eight pumps is 1,143 MGD under wet weather conditions and 1,178 MGD under dry weather conditions.
DLZ was responsible for the following tasks:
- Evaluate existing conditions and rehabilitate PS-1
- Rack and Grit Building and the Screenings Building
- Increase the total pumping capacity by rehabilitating the pumps and motors
- Provide a permanent off-load facility for grit and screenings
- Replace if possible, the Davis gates with eight sluice gates
- Design the replacement of the existing heating and ventilating equipment
- Provide new additional heating and ventilation equipment
- Upgrade the power distribution
- Design the rewiring, and terminate the existing Westinghouse Ovation Control System
- Evaluate and provide the design for miscellaneous architectural and structural components
During the Construction Phase, DLZ assisted during bidding, reviewed shop drawings, responded to Requests for Information (RFIs), prepared record drawings from Contractor’s as-built, developed Standard Operating Procedure (SOP), provided assistance during Start-up and Operation, prepared system O&M documentation, and provided training.