Duke Energy Corp has agreed to find and remove coal ash that a retired North Carolina power plant spilled into the Dan River, which provides drinking water to two towns in nearby Virginia, U.S. environmental regulators said on Thursday. The U.S. Environmental Protection Agency (EPA) will oversee the cleanup, and Duke will reimburse EPA for current and future costs, a statement issued by the EPA said. On Feb. 2, a 48-inch (122-cm) stormwater pipe beneath a coal ash pond ruptured at the retired Eden coal plant and released between 24 million and 27 million gallons (91 million to 102 million liters) of wastewater and as many as 39,000 tons of coal combustion residue into the Dan river that supplies drinking water to two towns in Virginia.