North Carolina regulators have cited a Duke Energy coal ash deposit site for environmental violations, this time at the Asheville Regional Airport.

Media outlets report the state Department of Environmental Quality cited Duke on Wednesday for two violations at the Asheville site. In both cases Duke, and site operator Charah, failed to notify the agency within 24 hours of a structural breach caused by severe erosion that had exposed coal ash and a plastic cover to the elements.

The department says Duke discovered the problems on Oct. 29, but didn't report them until Nov. 2.

Duke spokeswoman Catherine Butler says the company immediately corrected the problem.

The department has given Duke until Dec. 31 to submit a written report explaining how the structures breached and where the coal ash migrated.