...tar sands oil that is, more toxic and corrosive than the sweet stuff.
An Exxon Mobil pipeline that ruptured, leaking oil into Yellowstone River, may have sometimes carried a heavier and more toxic form of crude than initially thought, federal regulators said on Thursday.
Richard Opper, head of the Montana Department of Environmental Quality, said he was surprised to learn the pipeline buried in the streambed of the Yellowstone may sometimes have moved tar sands crude from Canada. "If the question is, did we know it was carrying tar sands oil? Hell, no," he said in an interview on Thursday. "If companies are changing the kinds of materials in pipelines to mixes that make them more likely they will leak or rupture, that raises huge concerns."
LINK (Via: Reuters)