Reuters: Enbridge Energy Partners LP has begun a new round of dredging on the Kalamazoo River, Michigan, to clean up oil from a huge pipeline spill in 2010, the U.S. Environmental Protection Agency said on Tuesday. More than 20,000 barrels of heavy Canadian crude oil gushed into the Kalamazoo River system following the rupture of Line 6B in July 2010, the largest onshore oil spill in U.S. history. Enbridge Energy Partners, the U.S. unit of Canada's largest pipeline company Enbridge Inc received an order...