THIS CASE INVOLVES VIOLATIONS BY THE STATE OF ILLINOIS OF THE ILLINOIS STATE IMPLEMENTATION PLAN ( SIP ) AS PROMULGATED PURSUANT TO SECTION 110 OF THE CLEAN AIR ACT ( ACT ), 42 U.S.C. SECTION 7410. IN PARTICULAR, THE STATE VIOLATED THE OPACITY LIMITATIONS SET FORTH AT ILLINOIS POLLUTION CONTROL BOARD ( IPCB ) RULE 212.123, 35 ILL. ADM. CODE SECTION 212.123, ON THREE SEPARATE DAYS IN NOVEMBER AND DECEMBER1993, AT THE CAPITOL POWER PLANT LOCATED AT 315 N. KLEIN, SPRINGFIELD, ILLINOIS. RESPONDENT HAS PAID THE CIVIL PENALTY AND HAS MADE ALL REQUI RED SUBMISSIONS TO THE COMPLAINANT. THOUGH THE CACO ALSO R EQUIRES THAT RESPONDENT CONTINUE TO OPERATE THE SEP IMPROVEM ENTS FOR TWO YEARS (UNTIL JUNE 13, 1999), COMPLAINANT HAS N O REASON TO BELIEVE THAT THE STATE WILL NOT OPERATE THE SEP (INDEED, IT WOULD BE COSTLY AND INEFFICIENT TO REMOVE THE IM PROVEMENTS) AND NO FURTHER REPORTING FROM THE STATE IS REQUI RED.