This matter involves five petitions seeking review of a Clean Air Act Prevention of Significant Deterioration (“PSD”) permit (“Permit”) that the U.S. Environmental Protection Agency (“EPA” or “Agency”) Region 2 (“Region”) issued to Energy Answers Arecibo, LLC (“Energy Answers” or “Permittee”) on June 11, 2013. The Permit authorizes Energy Answers to construct and operate a new resource recovery facility in Arecibo, Puerto Rico.