Brian Kelly with the EPA uses a flash light to shows containers of chemicals in one of the buildings in the former RocK Tenn paper mill site on Helen Avenue in Otsego, Mich. (Mark Bugnaski/Kalamazoo Gazette-MLive Media Group via AP)
Brian Kelly with the EPA walks around the former RocK Tenn paper mill site on Helen Avenue in Otsego, Mich. (Mark Bugnaski/Kalamazoo Gazette-MLive Media Group via AP)
Brian Kelly with the EPA uses a flash light to show barrels of chemicals that have been collected for classification and removal from around the former Rock Tenn paper mill site on Helen Avenue in Otsego, Mich. (Mark Bugnaski/Kalamazoo Gazette-MLive Media Group via AP)
The former Adams Plating Company, which is now an EPA Superfund Cleanup Site is pictured on Thursday, March 2, 2017, in Lansing, Mich. (Julia Nagy /Lansing State Journal via AP)
FILE - In this Feb. 21, 2017 file photo, Environmental Protection Agency (EPA) Administrator Scott Pruitt speaks in Washington. While Oklahoma’s attorney general, emails show that new Environmental Protection Agency chief Scott Pruitt was in frequent contact with fossil fuel companies and special interest groups working to undermine federal efforts to curb planet-warming carbon emissions. (AP Photo/Susan Walsh, File)
FILE - In this Jan. 18, 2017, file photo,Environmental Protection Agency Administrator nominee, Oklahoma Attorney General Scott Pruitt testifies on Capitol Hill in Washington at his confirmation hearing before the Senate Environment and Public Works Committee. Senate Republicans are poised to use their majority to confirm Pruitt to lead the Environmental Protection Agency, despite calls from Democrats for a delay.(AP Photo/J. Scott Applewhite, File)
In this Jan. 4, 2017, file photo, Environmental Protection Agency (EPA) Administrator-designate Scott Pruitt answer a reporter's question during his meeting with Sen. Shelley Moore Capito, R-W.Va., on Capitol Hill in Washington. When President-elect Donald Trump’s choice to head the U.S. Environmental Protection Agency first took office as Oklahoma’s attorney general, he disbanded the unit responsible for protecting the state’s natural resources. Instead, Pruitt reassigned his staff to focus on filing lawsuits against the federal agency he’s now selected to lead. (AP Photo/Cliff Owen, File)
Environmental Protection Agency Administrator Gina McCarthy speaks during a news conference with U.S. Rep. Ben Ray Lujan (right), on Aug. 13, 2015, along the Animas River Trail in Berg Park in Farmington, N.M. (Jon Austria/The Daily Times via Associated Press) ** FILE **