An environmental project to protect the St. Lawrence River
Did you know that the shore of the St. Lawrence River in the sector of the Bonaventure Expressway used to be a landfill site for industrial and household waste? The Corporation is conducting an innovative environmental project in this area to protect the St. Lawrence River from groundwater contaminants.
Together, the federal, provincial and municipal authorities responsible for this land are investing in restoring its ecological balance. The Corporation has spearheaded these historic partnerships to identify an integrated solution to this environmental problem for the entire site.
The west sector includes the land along the Bonaventure Expressway facing Île des Sœurs at the approach of the Champlain Bridge. Studies in this area has revealed ammonia nitrogen, polycyclic aromatic hydrocarbons (PAHs), and dissolved metals in the groundwater.
The run-in period for the environmental project in the west sector is ongoing and will last until spring 2017. In this sector, we installed a groundwater containment and treatment system. The water is contained by a hydraulic barrier of 32 pumping wells that capture contaminated groundwater and direct it to a building for treatment before being discharged back into the river. The entire system should start up next spring and will be operational for 15 years.
This project is being conducted in partnership with the Ministère du Développement durable, de l’Environnement et de la Lutte contre les changements climatiques du Québec.
The east sector includes the section of the Bonaventure Expressway between the Clément Bridge and Victoria Bridge. Here, testing has detected free-phase petroleum hydrocarbons (diesel) contaminated with polychlorinated biphenyls (PCBs). These hydrocarbons float at the top of groundwater.
In the east sector, the Corporation is building a retaining wall to contain and capture PCB-contaminated hydrocarbons. Two pumping stations at each end of the wall will collect the contaminants, which will then be disposed of as per the applicable legislation. The work has advanced considerably since this spring. The 128 pumping wells are now built and the team is working on the installation of the chambers and the extraction lines, as well as the construction of the two pumping stations.
The containment system should be in the run-in period in fall 2017. Thanks to this system, hydrocarbons will be contained and captured before they migrate to the river.
For more information about rehabilitation in the area of the Pointe-Saint-Charles industrial park (a property of the Ville de Montréal), visit the Ville de Montréal’s website.