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The regulator said last month that it had found the $6.8 billion project, which would boost capacity from 300,000 barrels per day to 890,000 bpd and the number of oil tankers in Vancouver waters nearly seven-fold, would not cause significant harm to the environment.

But critics, who say the project will hasten the development of Alberta’s oil sands and worry about the impact of an oil spill on Canada’s west coast, were quick to pledge action against the regulator’s decision.

The Squamish First Nation, whose traditional territories include areas directly impacted by the pipeline and shipping routes, filed an application for judicial review late last week. Environmental groups have also taken legal action.

The regulator declined to comment on the specific court actions, noting that the scope of its review of projects such as the Trans Mountain expansion is mandated under federal law.

Ali Hounsell, a spokeswoman for the expansion project, said the company is reviewing the applications and “will be responding more fully through the court process.”

The NEB’s recommendation on the project must still be reviewed by Prime Minister Justin Trudeau’s cabinet, with a final decision expected in December.

© Thomson Reuters 2016