Enbridge wants to replace Line 3, which was built in the 1960s.
Currently runs at about half its original capacity because it’s increasingly subject to corrosion and cracking.
Proposal opposed by environmentalists because Enbridge’s preferred route would carry oil sands crude across environmentally sensitive areas.
The $7.5 billion project involves 1,660-km from Hardisty, Alta. to Superior, Wis.
Inspection reveals numerous environmental and safety concerns.