But this was no typical oil spill. The pipeline owned by the - TopicsExpress

But this was no typical oil spill. The pipeline owned by the Canadian company Enbridge carried mostly heavy, viscous crude from tar sands fields in Alberta, Canada, bound for Midwestern refineries. Raw tar sands oil, or bitumen, is so thick that it has to be mixed with a thinning compound, or diluent -- a highly volatile derivative of natural gas that includes large amounts of benzene and other toxic chemicals -- in order to make it liquid enough to pump through pipelines. When that combination, known as DilBit, spilled out of the ruptured pipeline, the benzene and other chemicals in the mixture went airborne, forcing mandatory evacuations of surrounding homes (many of which were later bought by Enbridge because their owners couldn’t safely return), while the thick, heavy bitumen sank into the water column and coated the river and lake bottom, mixing with sediment and suffocating bottom-dwelling plants, animals, and micro-organisms. Surface skimmers and vacuums were no help, and a full year later, EPA officials and scientists are still working on a plan to remove submerged oil from about 200 acres of river and lake bottom. EPA officials had given Enbridge an August 31 deadline to get all the oil out, but they now say a full cleanup could take years. “Where we thought we might be winding down our piece of the response, we’re actually ramping back up,” said Mark Durno, one of EPA’s on-scene coordinators. “The submerged oil is a real story -- it’s a real eye-opener. … In larger spills we’ve dealt with before, we haven’t seen nearly this footprint of submerged oil, if we’ve seen any at all.” onearth.org/article/tar-sands-oil-plagues-a-michigan-community

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