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.
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. Gerry Broome AP
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. Gerry Broome AP