Approval and Promulgation of Air Quality Implementation Plans; Indiana; Alternate Monitoring Requirements for Indianapolis Power and Light-Harding Street Station

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EPA is proposing to approve a revision to Indiana's State Implementation Plan alternative monitoring requirements for Indianapolis Power and Light Company (IPL) at its Harding Street Generating Station. On December 31, 2008, Indiana requested approval of alternative monitoring requirements that allow the use of a particulate matter continuous emissions monitoring system in place of a continuous opacity monitor.