In this March 25, 2014 photo, Mike Hamilton, ground and crew supervisor for Bayou Well Services, keeps watch over a hydraulic fracturing operation at an Encana Corp. well pad near Mead, Colo. It takes a few weeks for the half dozen wells on a typical pad to be fracked, after which the petroleum products are extracted for years by operators like Encana. (AP Photo/Brennan Linsley)
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