Toronto underground line extension from Sheppard West Station to Vaughan Metropolitan centre stations (York Spadina). The adopted design was a twin tunnel with two 6.05 m diameter Earth Pressure Balanced (EPB) tunnel boring machines. Stations were built with cut and cover procedure.

According to monitoring measurements, our predictions and design procedures have shown to be right after construction activities have been carried out. Important technical improvements and time savings have been achieved.

PRO GEO underground design experience has helped our client in the following aspects:

• Settlement prediction and assessment of geotechnical monitoring results in the passage under Schulich Business School Building.
• Compensation grouting procedure under Schulich Business School Building.
• Geotechnical design of York University Station.
• Geotechnical design of Highway 407 Station.
• EPB performance assessment and c lay clogging problems.