Vice reports:

“It’s been three and a half years since Enbridge’s Line 6B pipeline ruptured in Marshall, Michigan, leaking more than 843,000 gallons of diluted tar sands bitumen into the Kalamazoo River. It was the largest on-land oil spill in the history of the USA, and remains, so far, as the largest spill of tar sands oil ever. Yet despite Enbridge’s immense, ongoing clean-up operation, which has spanned more than three years, cost over a billion dollars, and removed significantly more oil from the river than the company will admit it spilled, those living in Enbridge’s sacrifice zone have more questions than answers-even as most areas of the river have been re-opened for public use. High on the list of concerns is a chilling refrain: What are these chemicals that work crews have been dumping into the river in massive quantities, and are they dangerous?”