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

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. This final rule addresses a comment submitted in response to EPA's direct final rule published previously for this action on June 30, 2004. The effect of the state implementation plan (SIP) approval is to ensure Federal enforceability of the state air program plan to provide for maintenance of the lead NAAQS. 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. EPA is also providing notice of an administrative change to a table in the Code of Federal Regulations which identifies the Missouri SIP.