Approval and Promulgation of Air Quality Implementation Plans; Arkansas; Prevention of Significant Deterioration and New Source Review; Economic Development Zone for Crittenden County, AR; and Stage I Vapor Recovery

EPA is approving revisions to the Arkansas State Implementation Plan (SIP) that include changes made to Arkansas regulations entitled, "Regulations of the Arkansas Plan of Implementation for Air Pollution Control" and "Nonattainment New Source Review Requirements." The revisions amend the State's permitting rules in order to address revisions to the Federal New Source Review (NSR) regulations, which were promulgated by EPA on December 31, 2002 and reconsidered with minor changes on November 7, 2003 (collectively, these two final actions are called the "2002 NSR Reform Rules"). Prevention of Significant Deterioration (PSD) and Nonattainment NSR (NNSR) programs, together with the minor preconstruction permit program required by the Federal Clean Air Act ("Act"), are commonly referred to as the "NSR programs." Arkansas revised its preconstruction permitting rules that affect major sources and major modifications to include provisions for baseline emissions calculations, an actual-to-projected-actual methodology for calculating emissions changes, options for plantwide applicability limits (PALs), and recordkeeping and reporting requirements. The revisions also include non-substantive revisions to previously SIP-approved regulations and new regulations for implementing the permitting provisions for the 8-Hour Ozone National Ambient Air Quality Standard- Phase 2, Economic Development Zone in Crittenden County, and Stage I Vapor Recovery. Finally, EPA is taking no action on provisions that relate to designated facilities. We are approving the revisions because we find the changes consistent with EPA's implementing regulations, guidance, and policy and with section 110(l) of the Act.