IN SEPTEMBER 1977, RESPONDENT BEGAN OPERATION OF A NEW WASTE STABILIZATION FACILITY UNDER INTERIM STATUS, AND INSTALLED A CARBON SYSTEM AS A CONTROL DEVICE. THE REGULATIONS REQUIRED AN ENCLOSED COMBUSTION DEVICE. NO BASIS OF DESIGN (RECORD) WAS MAINTAINED FOR THE CONTROL DEVICE. UPON TESTING THE DEVICE AND FINDING IT DID NOT MEET THE REGULATORY PERFORMANCE REQUIREMENT (95% CONTROL), THE FACILITY BEGAN IN JUNE 1998 TO TREAT THE WASTE IN CON- TAINERS. EMISSIONS WERE GENERATED DURING TREATMENT WHICH WERE NOT CONTROLLED FOR A PERIOD OF TIME, THEN ROUTED TO THE EXISTING UTILITY BOILER. THE BOILER WAS SHOWN NOT TO MEET THE MINUMUM TEMPERATURE REQUIREMENT AT ALL TIMES WHEN WASTE WAS BEING TREATED.