Union Station is Canada’s busiest multi-modal passenger transportation hub and a significant part of Toronto’s heritage.
In order to maintain it’s place as a key part of Toronto’s transport network the station is undergoing a major transformation at platform and concourse level, and WJ has been providing expert assistance in this process.
WJ have been engaged by the client, Kiewit, to manage seepage flow into the excavation as well as any surface water generated from the construction process. To achieve this WJ installed a sump pumping system with pumps located across the excavation which pumped water into a sedimentation tank in order to allow settlement of fines and ensure discharge groundwater met the strict Toronto by-law requirementsThe sedimentation tanks were installed with an automated discharge management system which allowed the automated change from discharge to storage of pumped water dependant upon recent rain events and the requirements of the city.
The works are anticipated to run through the cold Toronto winter months there WJ will be remobilising to site soon to undertake winterisation of the system via a combination of heat trace and glycol heaters to keep the temperatures of the tanks and discharge lines above freezing conditions.