Designation of Areas for Air Quality Planning Purposes; State of Arizona; Pinal County and Gila County; Pb

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In accordance with section 107(d)of the Clean Air Act (CAA), the Environmental Protection Agency (EPA) is redesignating the Hayden area, which encompasses portions of southern Gila and eastern Pinal counties, Arizona, from "unclassifiable" to "nonattainment" for the 2008 national ambient air quality standards ("NAAQS" or "standards") for lead (Pb). EPA's redesignation of the Hayden area is based on recorded violations of the Pb standards at the Arizona Department of Environmental Quality's (ADEQ's) Globe Highway monitoring site, located near the towns of Hayden and Winkleman, Arizona, and additional relevant air quality information. The effect of this action will be to redesignate the Hayden area to nonattainment for the Pb standards and thereby to impose certain planning requirements on the State of Arizona to reduce Pb concentrations within the Hayden area, including, but not limited to, the requirement to submit, within 18 months of redesignation, a revision to the Arizona state implementation plan (SIP) that provides for attainment of the Pb standards as expeditiously as practicable, but no later than five years after the effective date of this redesignation.