Ms. Celeste Draisner, Mr. Rob Simpson, Ms. Heidi Strand, and Mr. Ed W. Coleman (“Petitioners”) each petition the Environmental Appeals Board (“Board”) to review a Clean Air Act prevention of significant deterioration (“PSD”) permit, PSD Permit No. SAC 12-01, that the United States Environmental Protection Agency (“EPA” or “Agency”) Region 9 (“Region”) issued to Sierra Pacific Industries (“Sierra Pacific”) on February 22, 2013. The permit authorizes Sierra Pacific to construct and operate a new biomass and natural gas boiler in the City of Anderson in Shasta County, California.