THIS IS A CIVIL ACTION UNDER THE CLEAN AIR ACT AGAINST CLARK'S REFINERY IN HARTFORD, IL. THE U.S. ALLEGES 3 COUNTS IN ITS COMPLAINT: (1) THAT CLARK EXCEEDED ITS AIR EMISSION LIMITS FOR PARTICULATE MATTER, (2) THAT CLARK OPERATED ITS FLUID CATALYTIC CRACKING UNIT WITHOUT A PERMIT, AND (3) THAT THE FCCU IS SUBJECT TO THE PSD RULES FOR THE REASON THAT CLARK MADE A MAJOR MODIFICATION TO THE FCCU WITHOUT FIRST APPLYING FOR A PSD PERMIT. THE MAJOR MODIFICATION OF THE FCCU CAUSED A SIGNIFICANT INCREASES IN EMISSIONS OF PARTICULATE MATTER, SO2 AND NOX. THE CASE WAS FILED ON 02/04/99.