Pointe-Saint-Charles Engineered Landfill and Capture System

Renovation, Construction and Decontamination

As part of the large-scale Pointe-Saint-Charles business park renovation project, the City of Montreal awarded us the contract to design an underground water system and build an engineered landfill, measuring approximately 2 km in length and 15 m in depth.

The purpose of this crucial project was to prevent the migration of contaminated groundwater and of free suspended hydrocarbons from the industrial park site in Pointe-Saint-Charles to the St. Lawrence River.

To complete this mandate, we performed the following work:

Built a concrete-cement engineered landfill, comprised of 23 pumps (via a special method to protect the existing underground infrastructure)

Built a contaminated water collection system along the entire length of the landfill (requiring major mechanical work to make it operational)

Perform infrastructure work on pumps, ducts, access shafts and cable chambers

Carry out electrical work and inspections

Managed thousands of tonnes of contaminated materials

Diverted captured water to a facility with the capacity to treat 1,300 m³ of water daily.

To detect and prevent conflicts during the project, we created and combined a 3D model of the groundwater collection system with a 3D analysis of existing underground facilities.

Throughout this project, we relied on our soil decontamination expertise to extract thousands of tonnes of contaminated soil. Despite this challenge and our meticulous management with every stakeholder, we completed this mandate in accordance with the client's requirements.