FILE - In a Wednesday, Feb. 5, 2014 file photo, Duke Energy engineers and contractors survey the site of a coal ash spill at the Dan River Power Plant in Eden, N.C. as state and federal environmental officials continued their investigations of the spill into the river. A federal grand jury is convening Tuesday, March 18, 2014, as part of a widening criminal investigation triggered by the massive Duke Energy coal ash spill that coated 70 miles of the Dan River with toxic sludge. (AP Photo/Gerry Broome, File)
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