Approval and Promulgation of Implementation Plans; Arizona State Implementation Plan Revision, Maricopa County

EPA is taking direct final action on a revision to the Arizona State Implementation Plan. This revision concerns two rules from Maricopa County: Rule 336--Surface Coating Operations; and, Rule 348-- Aerospace Manufacturing and Rework Operations. This final action will incorporate these rules into the federally approved SIP and stop the sanctions and Federal Implementation Plan clocks started on February 9, 1998 when EPA published a final limited disapproval of the State's previous submittal of Rule 336. The intended effect of approving these rules is to regulate emissions of volatile organic compounds (VOCs) according to the requirements of the Clean Air Act, as amended in 1990 (CAA or the Act). Rule 336 controls VOC emissions from different surface coating operations using primarily metal and plastic substrates. Rule 348 controls VOC emissions from aerospace manufacturing and rework operations. EPA is finalizing the approval of this revision into the Arizona SIP under provisions of the CAA regarding EPA action on SIP submittals, SIPs for national primary and secondary ambient air quality standards, and plan requirements for nonattainment areas.