Approval and Promulgation of Implementation Plans; Commonwealth of Kentucky: Approval of Revisions to the 1-Hour Ozone Maintenance State Implementation Plan for the Edmonson County and the Owensboro-Daviess County Area; Clarification

EPA is clarifying its approval of revisions to the 1-hour ozone maintenance plans for the Owensboro area (i.e., Daviess and a portion of Hancock counties), and Edmonson County portions of the Kentucky State Implementation Plan (SIP) submitted on April 16, 1998, by the Commonwealth of Kentucky through the Natural Resources and Environmental Protection Cabinet. Although not explicit in the language of the document for the approval, the Commonwealth's request and EPA's action involved the approval of an update for emission projections that were originally developed with an earlier version of the EPA mobile emissions model. That same approval action also identified the emission projections as the motor vehicle emissions budgets (or "budgets") for nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC) for use in transportation conformity determinations. However, that action did not specify for what year the "budgets" were being established. This action merely clarifies for which year the "budgets" for NO<INF>X</INF> and VOC were being established.