"An oil boom in Wyoming is having a filthy side effect. A string of accidents, ranging in geography from a remote gulley in the Powder River Basin to a refinery in downtown Cheyenne, already has made this year the state's worst for oil spills since at least 2009, state records show.

Almost 220,000 gallons of oil already has spilled in Wyoming this year, more than double the 90,000 gallons all last year. About 165,000 gallons spilled in 2010, the previous worst year since the Wyoming Department of Environmental Quality began tracking spills in a database that year."

Mead Gruver reports for the Associated Press September 18, 2014. [2]