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Yonge North subway extension:
Geotechnical surveying continues, February 4



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Two transit agencies and two municipalities are starting the preliminary planning, design and engineering phase of a project to extend the Yonge branch of the TTC’s Line 1 Yonge - University subway into York Region.

Yonge subway extension map.jpgMetrolinx, the TTC, the City of Toronto and the Region of York are planning to extend the line 7.4 kilometres (4.6 miles) through the Thornhill area of Markham and Vaughan to Richmond Hill. The four partners expect this phase of the project to continue for about a year.


With the preliminary planning, design and engineering phase underway, this week, crews start geotechnical testing

  • on Yonge Street between Highway 7 and Finch Avenue.

The crews work at various locations on Yonge over the next several months.

Geotechnical surveyors investigate underground soil conditions to help engineers design the project.


Starting 7 a.m. Monday, February 4 and continuing Mondays to Fridays, crews work

  • on High Tech Road between Red Maple Road and Yonge Street.

The crews use a drill rig to bore holes and extract samples. The work zone blocks the westbound curb lane through the area from 7 a.m. until 7 p.m. At the end of each of work day, crews restore the roadway.


York Region Transit passengers aboard buses along this route can expect delays:

  • 1 Highway 7

Expect construction-related noise and dust from equipment and trucks.

Geotechnical surveying on High Tech between Red Maple and Yonge and the resulting YRT delays continue “for approximately two weeks” or until about February 17.

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