The project involved the construction of a launch shaft into the profile of a hill beneath Eglinton Avenue. This project represents the first phase of an $8.5 billion transit expansion program to install a Light Rail Transit system.

Through a series of traffic stages, the project included the widening of the bridge over Black Creek Drive, and the construction of a caisson wall to permit the excavation of a 60-metre-long x 20-metre-wide x 17-metre-deep access shaft for Tunnel Boring Machines.

To permit unhindered vehicle movements on Eglinton Avenue during the overall project, a temporary road deck consisting of concrete deck plates and structural steel beams was installed.

Situated in a very small footprint with restricted access, the launch shaft was modified and construction sequences were adapted to benefit the subsequent tunneling contractor.