TORONTO — Infrastructure Ontario (IO) and Metrolinx have issued two requests for qualifications (RFQ) for advance tunnelling work on the Scarborough Subway Extension and the Eglinton Crosstown West Extension, the first phase of work for the two projects.
The Scarborough Subway Extension is an eight-kilometre extension of TTC Line 2 from Kennedy Station to McCowan Road/Sheppard Avenue, noted a March 10 release.
The Eglinton Crosstown West Extension is a 9.2-kilometre extension of the Eglinton Crosstown LRT, the future TTC Line 5. The extension will run mostly underground, westward from the future Mount Dennis station to Renforth Drive. A possible future connection to Toronto Pearson International Airport is also being studied.
To accelerate work on these projects, IO said, tunnelling will begin first under a separate contract, to be followed by second contracts for the balance of the work on each project, which will include building the stations, fitting out the tunnels and installing and commissioning the systems.
The scope of work to design, build and finance the tunnels for the Scarborough project as outlined in the RFQ includes the eight kilometres of tunnelling; design and construction of launch and extraction shafts and tunnels as well as headwalls for emergency exit buildings stations; supply tunnel boring machines (TBMs) and install segmental precast concrete tunnel liners; and activities necessary to build the tunnel such as utility relocations, supports for shaft and headwalls, temporary power supply, lighting, ventilation and drainage.
The Eglinton job will require tunnelling for approximately six kilometres of the 9.2-kilometre extension as well as works similar to those required for the Scarborough project.
The RFQ is the first step in the procurement process to select teams to deliver the advanced tunnelling work for the two projects, the release noted. Teams that emerge from the RFQ process will be invited to respond to a request for proposals in summer 2020.