Enbridge Energy Partners said it has finished repairs on its line 6A pipeline shut down last week due to a leak in a Chicago suburb and plans to restore service Friday morning.

The company said the leak was stopped Sunday evening after it found a hole in the 34-inch pipe in an industrial area of Romeoville. Enbridge said 6,100 barrels of crude oil were released during the spill, and only a small portion escaped from the immediate area before its crews began vacuuming up the oil.

The National Transportation Safety Board is investigating the cause of the leak. Investigators have removed a 12-foot section of the pipeline and will take a section of damaged water main from the leak site.

It was the second oil spill in less than two months from Enbridge’s nearly 60-year old Lakehead System, which transports about 70 percent of the crude oil from Canada. Enbridge Energy Partners is the U.S. subsidiary of Canada-based Enbridge Inc.

Enbridge Energy’s shares closed at $52.55 and lost 1 cent after hours while Enbridge Inc.’s were down 3 cents to $50.72.