Approval and Promulgation of Implementation Plans; State of Missouri; Designation of Areas for Air Quality Planning Purposes, Iron County; Arcadia and Liberty Townships

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EPA is announcing the redesignation of the lead nonattainment area in Iron County, Missouri, to attainment of the National Ambient Air Quality Standard (NAAQS) for lead. We are approving the maintenance plan for this area including a settlement agreement which was submitted with the redesignation request. The effect of the SIP approval is to ensure Federal enforceability of the state air program plan and to maintain consistency between the state-adopted plan and the approved SIP. The effect of the redesignation is to recognize that the area has attained the lead NAAQS and to focus future air quality planning efforts on maintenance of the lead NAAQS in the area.