The treated effluent would then flow by gravity from the plant through connecting conduits to the shaft and tunnel out into the lake. ![]() “To put the shaft and tunnel dimension into perspective, we’re effectively building a shaft which is a football field deep into the ground, a tunnel that is approximately three times the length of the Golden Gate Bridge, and a tunnel diameter that is the size of an average two-story house ,” Kevin Waher, a senior project manager at Hatch said. The CAD$300 million (USD$230 million) project included sinking a shaft adjacent to the shoreline and then mining a tunnel through rock directly beneath the lake bed. With team members in Canada, engineering company Hatch was responsible for the design and construction of a new tunneled outfall that would send treated wastewater from the treatment plant into Lake Ontario. However, the existing outfall had insufficient capacity for discharging treated effluent into the lake and was nearing the end of its service life, as it was constructed in 1947. It is the largest of Toronto’s four sewage plants, with a peak hydraulic capacity of 3,300 megaliters of wastewater per day. The treatment plant is one of Canada’s largest and oldest wastewater treatment plants, built in 1910 and in operation since 1917. ![]() ![]() ![]() Located east of downtown Toronto on the shore of Lake Ontario, the Ashbridges Bay Treatment Plant Outfall (ABTPO) project needed an upgrade.
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