Authorities Cited: United States Code 5 U.S.C. § 553(e) 42 U.S.C. § 7401(b)(1) 42 U.S.C. § 7607(b)(1) Code of Federal Regulations 40 C.F.R. § 63.4280 40 C.F.R. § 63.4281 Supreme Court 520 U.S. 154, 177-178 Circuit Courts 573 F.2d 157, 161 963 F.2d 603, 606-607 235 F.3d 139