Associated Engineering logo
Project Hero Image
Expertise icon

Oakville Fourth Line Closed Landfill


Oakville, Ontario



Containment Systems

Environmental Engineering

Pump Stations

For over 20 years ending in 1982, the Oakville Fourth Line Landfill in the Regional Municipality of Halton received the town’s waste.

Subsequently, the Region constructed a new toe drain and leachate pump station to more effectively manage the accumulating leachate and protect the surrounding environment. The management strategy for handling the leachate included recirculating it at the landfill and hauling the leachate off-site by tanker truck for treatment.

To eliminate the need to haul and off-load approximately 40,000 to 55,000 cubic metres of leachate per year from the closed landfill facility, the Region engaged Associated Engineering to complete the preliminary and detailed design for a new submersible wet well leachate pump station and 100 millimetre force main (twinned for redundancy), connecting the station to the adjacent Neyagawa sanitary sewer.

Map Image
Blue Section

Project Highlights

Choosing the force main routing and pump station design involved evaluating numerous factors. These included the presence and location of contaminated fill, unforeseen waste disposal areas, boulder, debris, and refuse within the working limits. In addition, consideration was given to the variable nature of the fill material, which would be controlled by selecting a less steep trench side slope or by providing lateral support to the trench walls. Special consideration was also given to the overriding environmentally sensitive areas and minimizing adverse effects on surrounding wildlife habitats.

We also provided contract administration and inspection services throughout construction.


See all insights

Green Section


A career step in the right direction

We are recognized as one of Canada’s Best Managed Companies for 14 consecutive years but our achievements and reputation are only possible because of our amazing staff. We believe that a supported staff allows them to excel at what they do best, and provide the best possible service to our clients and communities.