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Geotechnical investigation to take place on Yonge Street

What is a geotechnical investigation?

A geotechnical investigation involves the collection and testing of soil samples. As part of the Conceptual Design Study for the proposed Yonge Subway extension, we need to determine what the ground conditions are along the proposed subway alignment. When the project receives funding, this will inform future design and costing decisions associated with materials, construction methodology, and tunnel depth.

Drilling will occur at predetermined locations along the alignment and will take soil samples at varying depths. Two borehole drilling machines will be working in parallel to expedite the schedule. Samples collected from the boreholes will be tested to determine their physical properties.

Where will this work be done?

The work is being done along Yonge Street from Steeles Avenue to High Tech Road. The majority of the boreholes are off the travelled portion of the road. However, there are two locations where the work will be located in the roadway and will require lane restrictions on Yonge Street. Additionally, there are three locations which are in close proximity to the road and may impact traffic flow.

When will this work be done?

Working from the south end to the north end, soil samples will be taken from 12 locations along Yonge Street over five weeks (see chart below), from 9:30 am – 3:30 pm.

Who is doing this work?

SPL Consultants Limited is conducting the investigations.

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more than just a rapidway
rebuilding Davis from the ground up
Davis Drive is approaching its final year of construction and we thank you for bearing with us as we work hard to transform Davis Drive.

construction is challenging
Completely rebuilding Davis is a challenging and complex project that required replacing and relocating outdated utilities and infrastructure under and above ground, before road widening could begin.

what’s to come
Substantial work above ground is underway. Here’s a snapshot of how work is progressing.


  • Construction of the vivastation at Parkside/Longford and Davis is underway.
    The steel structure and glass canopy shelter will arrive later this fall.
  • Construction of two more vivastations at Main and Southlake Hospital
    will also begin later this year.
  • The reconstruction of the Keith Bridge will be completed this fall.

viva is coming to davis – dec. 2015
In addition to having a centre-lane bus rapidway, Davis will have wider sidewalks, green open spaces and dedicated left-turn lanes at each intersection that will improve overall traffic flow. All these changes will make Davis an even greater destination to live, work, shop and play.

Go behind the scenes to see how vivaNext is transforming Davis