It also said all other construction activity will continue across the project.
"Trans Mountain takes its regulatory and environmental obligations very seriously,'" says the statement. "We are working with the regulator to ensure and to demonstrate that we have the appropriate communication protocols in place for contractors at all levels."
The statement did not say how many workers are affected by the stop-work order or how long the shutdown will last for the pipeline project, which spans from just north of Edmonton to Burnaby, B.C.
Environment and Climate Change Canada issued a stop-work order in April to halt Trans Mountain construction through a Burnaby, B.C., forest to protect hummingbirds and other migratory birds during nesting season.