INTERSTATE POWER COMPANY (IPC) DID A PRELIMINARY INVESTIGA- TION AND PRELIMINARY ASSESSMENT INTO POSSIBLE SOIL AND GW CONTAMINATION AT A COAL GASIFICATION SITE IN MASON CITY, IA. PROPERTY NOW OWNED BY IPC. MEETING HELD 11/04/87 WITH IPC. EPA REQUESTED ADDITIONAL INVESTIGATION. IPC WANTS EPA TO STATE CLEAN-UP LEVELS. ISSUE AS TO WHETHER WASTES FROM SITE ARE RCRA REGULATED (COMPANY TO FURNISH DOCUMENTATION).