CHARLESTON, W.Va. (AP) — A Colorado-based natural gas producer has agreed to pay a $3.15 million civil penalty to resolve pollution violations at 32 drilling sites in West Virginia.

The U.S. Department of Justice says in a news release the agency and the West Virginia Department of Environmental Protection reached a proposed settlement with Antero Resources Corp. over allegations of Clean Water Act violations at sites in Doddridge, Harrison and Tyler counties.

In addition to the fine, the settlement filed in federal court for the state's northern district requires the company to conduct restoration, stabilization, and mitigation work at impacted sites as well as provide mitigation for aquatic resource impacts.

The violations involved the unauthorized disposal of dredged and fill materials into waters near sites where Antero built well pads and other structures involved in hydraulic fracturing, also known as fracking.