Designation of Areas for Air Quality Planning Purposes; Arizona; Correction of Boundary of Phoenix Metropolitan 1-Hour Ozone Nonattainment Area

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EPA is proposing to correct the boundary of the Phoenix metropolitan 1-hour ozone nonattainment area to exclude the Gila River Indian Reservation. EPA is proposing this action under the authority of section 110(k)(6) of the Clean Air Act and in light of the Federal trust responsibility to the Tribes. This action is intended to facilitate and support the Gila River Indian Community's efforts to develop, adopt and implement a comprehensive Tribal Implementation Plan by removing unnecessary obligations that flow from the erroneous inclusion of a portion of the Reservation in the Phoenix metropolitan 1-hour ozone nonattainment area.