Approval of Air Quality Implementation Plans; California; Eastern Kern; 8-Hour Ozone Nonattainment Area Requirements
The Environmental Protection Agency (EPA) is proposing to approve, or conditionally approve, all or portions of three state implementation plan (SIP) revisions submitted by the State of California to meet Clean Air Act (CAA or ``the Act'') requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS or ``standards'') in the Eastern Kern, California (``Eastern Kern'') ozone nonattainment area. The three SIP revisions include the ``2017 Ozone Attainment Plan For 2008 Federal 75 ppb 8-Hour Ozone Standard,'' the Eastern Kern portion of the ``2018 Updates to the California State Implementation Plan,'' and the ``Transportation Conformity Budget State Implementation Plan Update for the Eastern Kern 2017 Ozone Attainment Plan.'' In this action, the EPA refers to these submittals collectively as the ``2017 Eastern Kern Ozone SIP.'' The 2017 Eastern Kern Ozone SIP addresses certain nonattainment area requirements for the 2008 ozone NAAQS, including the requirements for an emissions inventory, attainment demonstration, reasonable further progress, reasonably available control measures, contingency measures, among others; and establishes motor vehicle emissions budgets. The EPA is proposing to approve the 2017 Eastern Kern Ozone SIP as meeting all the applicable ozone nonattainment area requirements except for the contingency measure requirement, for which the EPA is proposing conditional approval, and the reasonably available control measures and attainment demonstration requirements, for which the EPA is deferring action at this time. In addition, the EPA is beginning the adequacy process for the updated motor vehicle emissions budgets for 2020 in the 2017 Eastern Kern Ozone SIP through this proposed rulemaking.