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Ottawa Light Rail Transit - Execution

Site supervision services, engineering support and monitoring assessment. 24/7 presences on site to facilitate RES process and implement design requirements on site.
Estimated cost: Commencement:
February 01, 2012
Completion date:
January 01, 2019
259 Albert Street
Ottwa, ON K1R 7Z0
Technical data:
Geology description:

The geology varied between competent limestone and fractured shale. A soft ground section included variable glacial till deposits of sand, silt and clay layers and a groundwater table close to ground surface.

Geology types:
Bid cost: Final cost:
$2.1 billion CAD
Service areas:
Construction methods:
Tunneling under:

Ottawa's Confederation Line runs from Tunney's Pasture station in the west to Blair station in the east, is 12.5 km long and includes 15 stations. The central piece is a 2.5 km long tunnel, running under the central business district of the city and including three underground stations. The twin track running tunnel and the three underground stations were constructed using the mined construction method in order to minimise surface disruption. The underground stations are located directly adjacent to existing, sensitive and historic buildings and required strict adherence to design and risk mitigation processing during construction. The Dr. G. Sauer & Partners on site team supported the contractor to meet these requirements.

Station cavern and running tunnel construction underway
Excavation of station cavern complete with tension ties visible