(June 28, 2017, 1:42 PM EDT) -- DENVER — The U.S. government and the state of Colorado filed a lawsuit in Colorado federal court on June 26, alleging that a power company is in violation the Clean Air Act (CAA), 42 U.S.C. § 7401, and other statutes with regard to the emission of volatile organic compounds (VOCs) (United States of America, et al. v. PDC Energy, Inc., No. 17-1552, D. Colo.)....