In this March 25, 2014 photo, a technician inside a trailer monitors and directs the pressure and mix of water, sand and chemicals pumped during 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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