WISCONSIN POWER AND LIGHT (WPL) OWNES AND OPERATES THE COLUMBIA GENERATING STATION, AN ELECTRICAL POWER GENERATING FACILITY LOCATED IN PORTAGE, WISCONSIN. THE PLANT IS A MA- JOR STATIONARY SOURCE UNDER SECTIONS 111(A)(5) AND 302(J) OF THE CLEAN AIR ACT, 42 USC SECTIONS 7411(A)(5) AND 7602(J) THE PLANT BURNS COAL, CAUSING EMISSION OF PARTICULATES. UNIT 2 OF THE PLANT IS SUBJECT TO THE NEW SOURCE PERFORMING STANDARDS (NSPS), 40 CFR SECTOPMS 60.1 - 60.12 AND TO PER- FORMING STANDARDS FOR POSSIBLE FUEL STORAGE GENERATORS, 40 CFR SECTIONS 60.40 - 60.47. WPL EXCESSES AND OPERATING PAR- TICLES AND OPACITY STANDARDS AT 40 CFR SECTOPMS 60.11(D) AND 60.42 (A)(2), FROM 1984 - 1986. THIS ACTION IS BROUGHT TO ENFORCE CONTINUOUS COMPLIANCE WITH THOSE STANDARDS, THROUGH WPL CONVERSION OF COLUMBIA UNIT 2 FROM THE EXISTING HOT-SIDE ELECTROSTATIC PRECIPITATOR (ESP) TO COLD-SIDE DESIGN.