Designing and Integrating Toronto's Largest Sanitary/Combined Sewer Overflow Pumping Station

The City of Toronto has launched the largest and most significant stormwater management program in its history to prevent combined sewer overflows (CSO) from entering the waterways. The program includes over 30 km of new tunnels and storage shafts, a new pumping station, a Landform Project with a High-Rate Treatment Facility, and a new treatment plant outfall to Lake Ontario. The new Integrated Pumping Station (IPS) will replace two aging sanitary pumping stations and add a Wet Weather Flow (WWF) pumping system to pump Combined Sewer Overflows (CSOs) to a new high-rate treatment facility. The program will greatly improve the water quality in the Lower Don River, Taylor-Massey Creek and along Toronto’s Inner Harbour by treating CSOs and keeping them out of the waterways. This paper will focus on the design aspects of the new Integrated Pumping Station, highlighting some of the key construction considerations necessary to maintain plant operations throughout construction.