Federal regulators say CSX Transportation has agreed to a long-term plan for cleaning up and restoring the area around a fiery oil train derailment in southern West Virginia.
Under the U.S. Environmental Protection Agency order released Friday, CSX must submit a comprehensive plan within three weeks.
Investigators have not determined what caused 27 of the CSX train's 109 cars to go off the tracks during a Feb. 16 snowstorm in Mount Carbon.
Response teams have removed contaminated soil and recovered 110,000 gallons of an oil-water mix from the site.
The EPA says oil from the tank cars caused a sludge deposit in the Kanawha River and an adjoining creek or caused a sheen along the shorelines. The EPA says the oil remains a threat to public health and aquatic wildlife.