Approval and Promulgation of Implementation Plans; State of Iowa; Infrastructure SIP Requirements for the 2008 Lead National Ambient Air Quality Standards, Section 110(a)(2)(E)(ii), and a Supplemental SIP for Relevant Iowa Laws and Regulations

The Environmental Protection Agency (EPA) is proposing to approve elements of a State Implementation Plan (SIP) submission from the State of Iowa for the 2008 National Ambient Air Quality Standards (NAAQS) for Lead (Pb) addressing the applicable requirements of the Clean Air Act (CAA) section 110, which requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each new or revised NAAQS promulgated by the EPA. These SIPs are commonly referred to as ``infrastructure'' SIPs. The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the State's responsibilities under the CAA. EPA is also proposing to approve a supplemental revision for the SIP to include article 1, section 2 of the Iowa Constitution, and portions of the Iowa Code and the Iowa Administrative Code to codify the relevant state laws as applied to conflict of interest provisions.