Project Highlight: Wansford Yard Lift Station
Commonwealth Engineers evaluated and designed the Wansford Yard Lift Station Project.
This project included a new sanitary lift station, gravity sewer interceptor, and force main to address limited capacity in Evansville Water and Sewer Utility’s Highway 41 and Millersburg sanitary sewer basins.
First, the design team identified the existing lift station and upstream interceptor as undersized, which was causing sanitary sewer overflows and increased stress on equipment. Our engineers designed the Wansford Yard Lift Station and Force Main to convey existing and future flows. The station has an initial capacity of 20 MGD and can be upgraded to 25 MGD.
Due to the deep incoming influent sewer, the lift station wet well is approximately 60 feet deep, making the influent box, channels, and mechanical bar screen at approximately 40 feet deep. The project involved eliminating the Pfeiffer Road lift station via a new 30” gravity sewer interceptor installed using open-cut and trenchless tunneling methods. The project team investigated several route and pipe installation alternatives due to the presence of wetlands, a creek crossing, rock, and property owner/easement considerations. The project installed ~850 ft of the interceptor using micro tunneling methods to avoid specific surface impacts.
PROJECT HIGHLIGHTS
- New 20 MGD submersible lift station
- 62’ deep wet well
- 40′ deep influent box and channels with mechanical bar screens
- Four 160 HP submersible pumps
- Odor control unit
- New valve vault with check valves, plug valves, air release valves, surge relief valves, and access hatches with fall protection
- 18” discharge piping from each pump, connecting to a common 30” header and force main
- New 30” force main with combination air release/vacuum relief valves and structures
- New Lift Station building with office
- Electrical, screening, and dumpster rooms
- Generator
- Elimination of the existing lift station
- New 30” gravity sewer interceptor with allowances to accommodate an additional 54” interceptor (Phase 2)