But wasn't that a case of the launch site being changed in response to the burying of the Leslie section? It was my understanding that the launch site was dictated by the desired tunnel stretch, not the tunnel stretch being dictated by the launch site.
If the south side option is chosen, theoretically they can revert back to the original launch site, no?
I think the answer is a definite maybe.
In the presentation, Metrolinx identifies 4 (or 5) reasons why that location is not good.
One is the duration of traffic impacts and another is slope stability on the north side of Eglinton. If the South side alignment was chosen instead of the median option, neither of these would be issues since the traffic does not have to be diverted northwards.
The next was contaminated soil. This is a standard construction operation, yet they did not put a cost to it.
Another issue was shoring adjacent to new construction that has been built since the line was first proposed. Aside from the obvious question of why this was allowed to proceed and interfere with the largest transit project in Toronto's history, is the question of why a cost was not applied to this shoring activity - which again is a very standard construction operation. The final issue is noise to these recently purchased Condos, even though they bought knowing that construction is in the area, even though their distance to the TBM launch/extraction sites is not much different than elsewhere on Eglinton. It appears someone just assumed these people were averse to the noise, even though the reality is that many of these residents are probably the ones complaining about the elimination of the Leslie stop/station. They would likely tolerate the noise to receive the benefits of higher property values.
Metrolinx did not provide a cost estimate for the "Brentcliffe" TBM launch site, which involved very typical construction work adjacent to the actual launch pit, but they did provide a cost estimate for a Leslie Station (at $80M), even though this involves a very unique activity - building a Station under river level.