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Originally Posted by chowhou
Says who? If it's true that it would have to be buried/bored tunnel for engineering safety, the river depth is 22m, the industry standard TBM for a 8 lane tunnel seems to be 17m and the ceiling of the tunnel will have to be some depth below the river bottom. Who's to say it wouldn't be 60 metres below surface level?
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The article linked above says "Under the new re-tendering process, the project will be broken into five different parcels and Requests for Qualifications have been issued to identify qualified proponents for phases of the project, according to the BC transportation ministry.
The five key contracts are: the immersed tube tunnel and the south portal on Deas Island; the north portal in Richmond; finishing works for the tunnel (paving, mechanical, electrical and plumbing); the new Deas Slough Bridge; and highways and civil works."
The plan seems to be to keep the project unchanged overall, but split it into separate contracts that Canadian contractors can more easily bid for. The previous contractor was a mix of French, Spanish and Canadian businesses. The Canadian business, Pomerleau, are still planning to be involved.
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