W. K. Lis
Superstar
Dead wrong, with single bore they just need to cut a few meter of the station from the top to lower the equipment and everything can be done underground. No need to cut the intersection at all. It's similar to the mined stations at Laird and Oakwood which they didn't even touch the intersection. The entire platform can fit inside the tunnel unlike the crosstown where they have to destroy the bored tunnel liners. The few meters they cut would become the entrances to the station.
It is especially important to keep intersections like Eg/Martin Grove flowing or traffic will back up onto the 401/427.
If you read the Design Plates from this link, you'll see that the underground station platforms will be approximately 20±m below the surface.