Rescue of $3M boring machine trapped under Toronto street delayed again as recovery costs skyrocket

The rescue of a multi-million dollar boring machine trapped beneath a west Toronto street has been delayed again, with the city warning it might not be the last set-back before the project is wrapped.

City staff told residents last month that the project, which was supposed to have been completed this fall, is instead expected be finished by December. Some additional restoration of the street — Old Mill Drive near Bloor Street West — will not take place until the spring.

"Everyone in the neighbourhood is just feeling increasingly frustrated," resident Tanya Boswick said. "It feels as though this project is just never going to end." 

A notice sent to residents blames the complexity of the project, taking place underground in confined spaces with "variable conditions" for the delay. But staff warn in the notice that it might not be the last such delay.

"The current schedule represents our best estimate based on known and observable factors," the city said in an update on the project last month. "However, due to variable underground conditions, weather, and other potential unforeseen circumstances, the schedule is subject to change."

Boswick said residents have been struggling with a stream of heavy-equipment, dirt and vibrations since the project began. She's skeptical about the revised timeline.

"We're going into winter with a ton of parts of the neighborhood that are in disrepair, we have noise constantly all day," she said. "We can't get a moment of rest and moments of reprieve from the nightmare of this project."

The delay is just the latest problem the city and contractors have encountered with the project, which has nearly tripled in price since earlier this year, with costs jumping to $25 million — up from the approximately $9 million price tag in March. 

The city says the contractor now needs to do as some of the remaining work  "sequentially rather than simultaneously" which will add months to the timeline.

Mika Raisanen, a director in the city's engineering and construction services department, says grout used to stabilize the ground had seeped into the shaft by the machine. That led to a further delay as workers cleared it out.

"It looks like [the boring machine] will be removed in the next few weeks and that really is a major milestone for us because then we can continue with the remaining work and wrap things up," he said.

The work to dig a new storm sewer on Old Mill Drive began in March 2022. The project was designed to address chronic basement flooding in the area. City staff opted to use a remote-controlled micro-tunnelling boring machine, which is 1.5 metres wide and five metres long to create the new sewer tunnel.

The plan was for the machine to be placed 18 metres below ground and have it travel 282 metres to a pre-constructed exit shaft on Bloor Street West. Workers needed to place it deep underground to avoid coming into contact with the nearby Bloor-Danforth subway line.

But with just seven metres left to go on its route, the machine hit 14 underground steel tiebacks, which had been part of the construction of a nearby condo building. It became ensnared in them, and is now twisted and turned off course.