FILE - This Oct. 11, 2013 file photo shows cleanup at the site of an oil pipeline leak and spill near of Tioga, N.D. Tesoro Corp. found no contamination during earlier testing, but state crews were

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FILE - This Oct. 11, 2013 file photo shows cleanup at the site of an oil pipeline leak and spill near of Tioga, N.D. Tesoro Corp. found no contamination during earlier testing, but state crews were at the site near Tioga on Tuesday, Nov. 12, 2013 taking their own samples. Results were expected in a week or two, State Environmental Health Chief Dave Glatt said. (AP Photo/Kevin Cederstrom, File) less 

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Associated Press
Wed, Nov 13, 2013 3:23 PM EST