The Obama administration wants to keep secret the locations of nearly four dozen coal ash storage sites that pose a threat to people living nearby.
The Environmental Protection Agency identified the 44 sites as potential hazards to communities while investigating storage of coal ash waste after a spill at a Tennessee power plant in December. The sites have existed for years with little or no federal regulation.
The Army Corps of Engineers in a letter dated June 4 told the EPA that it couldn't alert the public to the whereabouts of the 44 sites because it would compromise national security.
The Corps of Engineers had no immediate comment.