Ashbridge Bay Treatment Plant Outfall

Stiver is proudly supporting the Ashbridge’s Bay Treatment Plant Outfall. This $300 million project for the City of Toronto will replace the current outfall tunnel, which is at the end of its service life. It is set to be the largest wastewater outfall in Canada. The project includes a 16-meter diameter shaft by 85-meter deep, a 3.5-kilometer TBM excavated tunnel that has a 7-meter ID and precast concrete segmental lining. We are providing riprap placement plans for the riser sections on the lakebed. These cages will be placed at the bottom of Lake Ontario and will be guided in place by divers. The riprap baskets will be installed around each of the fifty – 1-meter diameter risers that extend from the tunnel to the lakebed. Learn more about this project in Tunnel Business Magazine: https://bit.ly/tbm-stiver-1-2022