"EPA will work with Duke Energy to ensure that cleanup at the site, and affected areas, is comprehensive based on sound scientific and ecological principles, complies with all Federal and State environmental standards, and moves as quickly as possible," said Heather McTeer Toney, the EPA's regional administrator based in Atlanta. "Conditions resulting from the coal ash release at the Dan River Steam Station present a substantial threat to public health or welfare and the environment if not properly managed," the agency states in the agreement signed Thursday. "Actual or threatened releases of hazardous substances from this site, if not addressed by implementing the response action selected in this Action Memorandum, may present an imminent and substantial endangerment to the public health, welfare or the environment," the agreement says. Separately, North Carolina lawmakers are debating a measure about what to do with Duke's 33 ash dumps at 14 power plants in North Carolina, which are located along rivers and lakes that cities and towns rely on for drinking water. The suit alleges that Duke executives have known for years that ash pits were leaking toxic chemicals but failed to take meaningful action prior to the spill, which has potentially exposed shareholders to millions in loses.