ESSROC Cement Corporation (“ESSROC”) petitions the Environmental Appeals Board (“Board”) to review the annual mercury feed rate limit in a Resource Conservation and Recovery Act (“RCRA”) permit the U.S. Environmental Protection Agency (“EPA”) Region 5 (“Region”) issued. The permit governs cement kiln operations at ESSROC’s Portland cement manufacturing facility in Logansport, Indiana (“Facility”), which burns hazardous waste as fuel.