The "C" tank farm is shown during a media tour of the Hanford Nuclear Reservation Wednesday, July 9, 2014 near Richland, Wash. Officials said Wednesday that 12,000 air samples taken at Hanford this year after more than three dozen workers reported being sickened by chemical vapors have failed to find a cause for the problem. Journalists were only allowed to visit the normally bustling tank farm worksite during a lunch break when only two workers were present. (AP Photo/Ted S. Warren)
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