Spills of heavy crude oil from western Canada’s tar sands are more difficult to clean up than other types of conventional oil, particularly if the spill occurs in water, a new study by a high-level committee of experts found. Moreover, current regulations governing emergency response plans for oil spills in the United States are inadequate to address spills of tar sands oil.
The study by the U.S. National Academies of Sciences, Engineering, and Medicine confirmed what scientists, emergency responders, and conservationists knew anecdotally from a major oil spill that contaminated Michigan’s Kalamazoo River in 2010 and another spill in Mayflower, Arkansas in 2013. Tar sands crude, called diluted bitumen, becomes denser and stickier than other types of oil after it spills from a pipeline, sinking to the bottom of rivers, lakes, and estuaries and coating vegetation instead of floating on top of the water.
“[Diluted bitumen] weathers to a denser material, and it’s stickier, and that’s a problem. It’s a distinct problem that makes it different from other crude.”
–Diane McKnight,
Chair
Committee on the Effects of Diluted Bitumen on the Environment
“The long-term risk associated with the weathered bitumen is the potential for that [oil] becoming submerged and sinking into water bodies where it gets into the sediments,” Diane McKnight, chair of the committee that produced the study and a professor of engineering at the University of Colorado Boulder, told Circle of Blue.
…click on the above link to read the rest of the article…
