24. Arizona Public Serv. Co. v. EPA, 211 F.3d 1280 (D.C. Cir. 2000)
1990 CAA amends, 1998 EPA Tribal Authority Rule
within the boundaries “or other areas within” the T’s jurisdiction
no “gold standard” for delegation of federal authority
U.S. v. Enas (case 109) rehearing re 25 U.S.C 1301(2)