Promulgation of Air Quality Implementation Plans; State of Arkansas; Regional Haze Federal Implementation Plan Revisions; Withdrawal of Portions of the Federal Implementation Plan

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The Environmental Protection Agency (EPA) is amending a Federal Implementation Plan (FIP) that addresses regional haze for the first planning period for Arkansas as it applies to the best available retrofit technology (BART) requirements for sulfur dioxide (SO 2 ) and particulate matter (PM) for seven electric generating units (EGUs) in Arkansas and the SO 2 requirements under the reasonable progress provisions. These portions of the FIP will be replaced by the portions of a revision to the Arkansas State Implementation Plan (SIP) that we are taking final action to approve in a separate rulemaking that is published elsewhere in this issue of the Federal Register.