CALUMET STEEL COMPANY WAS REQUIRED BY EPA TO STACK TEST ITS CAST HOUSE/MELT SHOP BAGHOUSE AS PART OF A PARTICULATE MATTER INITIATIVE IN REGION 5 GEOGRAPHIC INITIATIVE AREAS. THE TEST WAS CONDUCTED IN MARCH 1999, AND SHOWED VIOLATION OF THE ILLINOIS SIP PARTICUALTE EMISSION LIMIT. IMMEDIATELY AFTER THE TEST, CALUMET PERFORMED MAINTENANCE AND REPAIR ACTIVITIES INCLUDING CHANGEOUT OF ONE COMPARTMENT OF THE BAGHOUSE. ANOTHER STACK TEST WAS CONDUCTED IN APRIL 1999 WHICH SHOWED COMPLIANCE. AN NOV WAS ISSUED IN JUNE 1999, AND AT THE SUBSEQUENT POST-NOV CONFERENCE, CALUMET IDENTI- FIED THE PROBLEM AS LEAKING BAGS IN THE COMPARTMENT THAT WAS CHANGED OUT. AN ADMINISTRATIVE PENALTY ORDER WAS DRAFTED, AND AS PART OF SETTLEMENT NEGOTIATIONS, CALUMET AGREED TO INCREASE ITS COMPARTMENT CHANGEOUT FREQUENCY AS WELL AS PERFORM A SEP CONSISTING OF INSTALLATION AND OPERATION OF A CONTINUOUS BAG LEAK MONITOR.