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Graham awarded contract for Ashbridges Bay treatment plant

Ashbridges Bay Wastewater Treatment Plant
Following our annual Leaders Magazine featuring Canada's Best in Construction, learn more about those who made our TOP 50.  Here is one the latest projects awarded to Graham Group, Leader No. 8. 

The City of Toronto recently awarded Graham Construction a $236.5-million contract for the Effluent Disinfection System project at the Ashbridges Bay Treatment Plant.

Under this contract, Graham will replace the existing chlorine-based effluent disinfection system with an ultraviolet (UV) disinfection facility, states a release.

The project is already underway and expected to be completed in November 2021.

The contract requires three major phases of construction:

  • excavation of the ash lagoon (hazardous material) and backfill, plant water pumping station upgrades and seawall substation upgrades as well as upgrades to existing seawall gates;
  • a new disinfection building including an associated UV treatment system, effluent and bypass channels and site civil work; and
  • a new west bypass conduit, east bypass conduit, final UV effluent channels, sample buildings, a new truck weigh scale, lighting, roads and landscaping.
The Ashbridges Bay Treatment Plant has been in operation since 1917 and is one of Canada’s largest and oldest wastewater treatment plants.



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