In this June 9, 2014 photo, a petroleum industry worker stands on an oil and gas rig on a well pad, in New Castle, a small farming and ranching settlement on the Western Slope of the Rockies, in Colo. Four in 10 new oil and gas wells near national forests and fragile watersheds or otherwise identified as higher pollution risks escape federal inspection, unchecked by an agency struggling to keep pace with America's drilling boom, according to an Associated Press review that shows wide state-by-state disparities in safety checks. (AP Photo/Brennan Linsley)
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