OCT 0320118 STATE OF ILUNOIS oiIuLlon Control Board TECHNICAL SUPPORT DOCUMENT for RULE REVISIONS TO PART 225: ILLINOIS RULE FOR;REDUC1NG MERCURY EMISSIONS FROM COAL-FIRED ELECTRIC GENERATING UNITS AQPSTR 08-0 1 September 2008 ILLINOIS ENVIRONMENTAL PROTECTION AGENCY 1021 NORTH GRAND AVENUE EAST P.O.