The City of Saint Paul needed to increase capacity, improve reliability and provide redundancy at the Sherman Street Lift Station and forcemain. TKDA provided engineering and architecture services during the two phases of this project.
Phase 1 expanded the cross section of the tunnel to improve access and accommodate two new forcemain pipes. During phase 2, TKDA increased the pumping capacity by replacing the controls and SCADA systems, adding a standby generator and replacing the valves and piping between the lift station and the sandstone bluff. The lift station conveys wastewater from Shepard Road near the Mississippi River under the Soo Line Railroad tracks to the base of the sandstone bluff where it transitions to a sandstone tunnel.