Featured Project: TTC Subway Survey

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Monteith and Sutherland crews worked on a comprehensive survey for the TTC‘s Bloor-Yonge and Pape stations.

Soheil Namdari, pictured above, lead one of the Survey crews completing the control and topographic surveys at Pape Station. The survey crews performed precise traversing and levelling from local City of Toronto control monuments to Pape station. A street-level topopgraphic survey around Pape Station was completed for future planning purposes. We also searched for boundary evidence and completed a cadastral survey to confirm the Pape Station property limits.

At Bloor-Yonge Station project, the crews traversed and levelled from local City of Toronto control monuments to platform level, and then into the tunnels. The control network was then adjusted and used to coordinate the High-Definition Laser Scanning campaign. The challenge of the project has been the time constraints and limited work windows to ensure regular TTC services are not impacted. The use of a HD-scanner was imperative to get big volumes of detailed data as quickly as possible. Our Leica P40 Leica scanner is very quick and of the high precision.


Featured Project: Peel Region Sewer Tunnel Verification

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Our crews have been busy assisting Technicore Underground Inc. with verifying the tunnel alignment and ensuring the correctness of the traverse. The survey crews have performed precise traversing from the surface into the tunnel heading.

The long distance to get underground is challenging, and along with varying ambient conditions in the tunnel can cause significant error in the traverse. To mitigate that, and to ensure the highest accuracy of the traverse, our crews used a gyroscopic theodolite, which is one of the few available in Canada. We use a DMT GYROMAT3000, that is the most accurate north-seeking precision-surveying gyroscope in the world. The GYROMAT helps us obtain most accurate azimuths, and thus mitigate accumulative errors in the underground control networks, notably in the long-driven tunnels.

The tunnel being mined is part of the Region of Peel’s East Trunk Sewer twinning to improve wastewater service and allow for growth on the system. The Region of Peel has commissioned the installation of a large sanitary sewer pipe along Erin Mills Parkway, Lincoln Green Way and Lincoln Green Close.