UPDATE: cityoftoronto says an Old Mill Drive tunnelling job was 95% complete with the tunnel only seven metres from its destination when the micro-tunnelling boring machine doing the work became tangled up in debris from a previous private project.
Mika Raisanen, a director with the City of Toronto’s division of Engineering and Construction Services, recently offered new insights into why the city had to come up with a $9 million emergency contract to extricate the $3 million MTBM, which is ensnarled in old steel tiebacks.
The sewer needed to be installed at that depth to avoid conflict with the nearby Old Mill TTC Subway tunnel. In order to complete the tunnelling work, two vertical shafts were constructed on Old Mill Drive: one at Riverside Drive and the other on Old Mill Drive north of Bloor Street West. Because the MTBM encountered the tie-backs and was no longer aligned, it couldn’t reach its destination and required rescue.
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