Court of Appeals for the Fifth Circuit September 14, 1981, Nos. 80-3081, 80-3892 (Chevron U. S. A., Inc. v. United States Environmental Protection Agency)

SAM D. JOHNSON, Circuit Judge:

The issue presented in these consolidated cases is whether, in determining under section 169A of the Clean Air Act, 42 U.S.C. § 7491, that the Breton Wilderness Area (Breton) in Louisiana exceeded 5,000 acres in size on August 7,1977, the Administrator of the Environmental Protection Agency (the Administrator) acted in an arbitrary or capricious manner.