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The EPA designated portions of the physiographic region known as the “Uinta Basin” nonattainment for the 2015 Ozone NAAQS, effective August 3, 2018. The purpose of this Clean Air Act (CAA) Federal Implementation Plan (FIP) applicable to sources on Indian country lands within the Uintah and Ouray Indian Reservation (U&O Reservation) is to establish a bank of ozone-precursor emission reduction credits (ERCs) that may be generated and used for several air quality planning purposes. This FIP would also establish authority for the EPA or the Ute Indian Tribe, as applicable, to issue permits to yet unpermitted true minor sources of ozone precursor emissions to generate emission reduction credits. Specifically, the emission reduction credits could be utilized in achievement of the ozone National Ambient Air Quality Standard (NAAQS), general conformity demonstrations, and new source review (NSR) permitting related to development of new ozone-precursor emissions sources in the Uinta Basin Ozone Nonattainment Area in Utah.