Approval and Promulgation of Air Quality Implementation Plans; Delaware, Maryland, New Jersey, and Pennsylvania; Determinations of Attainment of the 1997 8-Hour Ozone Standard for the Philadelphia-Wilmington-Atlantic City Moderate Nonattainment Area and Withdrawal of Attainment Demonstration Proposed Disapprovals

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EPA is proposing to make two determinations regarding the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE 8-hour ozone moderate nonattainment area (the Philadelphia Area). First, EPA is proposing to make a determination that the Philadelphia Area has attained the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS). This proposed determination is based upon complete, quality assured, and certified ambient air monitoring data that show the area has monitored attainment of the 1997 8-hour ozone NAAQS for the 2008- 2010 monitoring period. If this proposal is made final, the requirement for the Philadelphia Area to submit certain planning requirements related to the attainment of the 1997 8-hours ozone NAAQS shall be suspended for so long as the area continues to attain the 1997 8-hour ozone NAAQS. Although these requirements are suspended, EPA is not precluded from acting upon these elements at any time if submitted to EPA for review and approval. Second, EPA is also proposing to determine that the Philadelphia Area has attained the 1997 8-hour ozone NAAQS by its attainment date of June 15, 2011. Finally, EPA is withdrawing the May 8, 2009 proposed disapprovals of the at