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Trans Mountain has filed a six-month construction schedule with the National Energy Board for the expansion of the pipeline.

The company says work has been underway since last fall at the Westridge Marine Terminal in Burnaby, B.C., and will continue, along with additional work in the province’s Lower Mainland.

READ MORE: Ottawa to buy Trans Mountain pipeline project, what does this mean for BC?

In July, it says it will begin developing the Westridge Marine Terminal tunnel portal at Burnaby Mountain and relocate existing infrastructure to expand the Burnaby Terminal.

It also says work on a 290-kilometre stretch of pipeline between Edmonton and Jasper National Park will begin in August and include surveying, staking and flagging the right-of-way.

READ MORE: Trans Mountain pipeline project purchase ‘major step forward’: Rachel Notley

It says it will clear trees and vegetation in the area while taking measures to protect the environment, such as weed control, the relocation of rare plants and wildlife surveys.

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In September, surveying, staking and flagging the right-of-way will begin in North Thompson, B.C., on a 120-kilometre stretch between Mt. Robson Provincial Park and Blue River.

READ MORE: Pipeline protesters rappel from Ironworkers Memorial Bridge, blocking tanker

On Tuesday, activists with Greenpeace rappelled off a bridge in Vancouver to protest the pipeline expansion, which is being purchased by the Canadian government for $4.5 billion.