The Trans Mountain oil pipeline expansion project has run into another construction-related hurdle that could delay its completion.

The crown corporation that owns the pipeline has filed for regulatory approval to modify the route of one of the remaining stretches of pipe yet to be completed.

In its regulatory filing, Trans Mountain Corp. said it has run into engineering difficulties related to the drilling of a tunnel in B.C. and wants to alter the route slightly for a 1.3-kilometre stretch of pipe, as well as the construction method.

But the filing documents illustrate how the company is facing opposition from the Stk’emlúpsemc te Secwépemc Nation, whose traditional territory the pipeline crosses and who had agreed to the originally proposed route and construction method.

The documents state that between May and July 2023, Trans Mountain Corp. met and corresponded several times with the First Nation’s leadership, who continued to express concern that the pipeline project was deviating from its previously agreed-upon route and construction method.

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