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Strabag wins Canadian sewage tunnels contract

Strabag has been awarded a CAD$79M (£43M) contract to build the Mid-Halton outfall tunnel from a water treatment plant in Oakville, Canada.

The project centres on the excavation of two 60m deep shafts and a 6.3km rock-bored tunnel to discharge waste water into Lake Ontario.

The section on the mainland will have a length of 4.1km. The 2.2km of offshore tunnel will terminate in an underwater diffusion structure. 

A tunnel boring machine with a diameter of 3.6m will be used to drive the bore through the shale and limestone geology.

Work will begin this month and is expected to last until October 2017.

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