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.