Enbridge Inc. will nearly triple the amount of contaminated sediment it dredges in Michigan's Kalamazoo River to clean up after a July 2010 oil pipeline spill, the U.S. Environmental Protection Agency announced Tuesday.
The 30-inch pipeline from Sarnia, Ontario, to Griffith, Ind., spilled into Talmadge Creek, a Kalamazoo River tributary.
The EPA said that Enbridge is implementing a March order to finish additional dredging this year. The work is above the Ceresco Dam upstream of Battle Creek and in Morrow Lake.
The project will lead to the temporary closing of 12 miles of the river, the EPA said. It said that Enbridge will dredge about 350,000 cubic yards of sediment.
Calgary, Alberta-based Enbridge already has dredged about 190,000 cubic yards of material and recovered 1.15 million gallons of oil from the river, the EPA said. The EPA said in March that it had confirmed the presence of submerged oil in three areas a and determined it could be removed through dredging.
Oil flowed about 35 miles before it was contained. An investigation by the National Transportation Safety Board determined that the rupture was caused by cracks and corrosion, and the agency faulted Enbridge for failing to take steps that might have prevented it.