Solution Bonaventure East Sector: An innovative project to stem the flow of contaminated water into the St. Lawrence River

6 September 2017

For 100 years, the shore of the St. Lawrence River was used as a landfill for industrial and household waste that has caused major contamination problems.

The Solution Bonaventure Environmental Project, which was launched in June 2016, now provides concrete solutions to stop these petroleum hydrocarbons contaminated with polychlorinated biphenyls (PCBs) from flowing into the river. In this sector, a 1.2-kilometre-long retaining wall was built using an innovative method called deep soil mixing—a first in Quebec—to contain and capture PCB-contaminated hydrocarbons and properly dispose of them.

The recovery system includes extraction chambers and lines connected to each of the 128 pumping wells. This system is connected to two recovery stations at each end of the site near the Clément Bridge and Victoria Bridge. “Our teams are motivated and have worked rain and shine to install the extraction chambers and lines. The location, linear dimension and narrowness of the site constantly bring new challenges,” explained Patricia Carrier, Engineer, Construction, who is working to the project. “Right now, our teams are installing the extraction chambers and lines and building the recovery stations,” added Patricia. The run-in period for the containment system should start at the end of fall 2017. Get an exclusive look at the site to understand how this complex and innovative system is implemented and operated.