Oil and refined products flows resumed Sunday through Trans Mountain Pipeline after a three-week suspension of deliveries as a safety precaution during floods in southern British Columbia.

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“The restart comes following completion of all necessary assessments, repairs, and construction of protective earthworks needed for the pipeline to be returned to service,” said the Calgary firm.

Trans Mountain reported no pipe breaks or leaks but said 470 crewmen, six helicopters and 100 earth-moving machines replaced 57,200 cubic yards of ground cover that rain and mudslides washed away during storms that started Nov. 14.

Costs of the suspension and restoration operations were not disclosed. The storms hit western and southern sections of the 1,150-kilometer (690-mile) pipeline that...