ON OCTOBER 29, 1998, AT 2:40 PM, UOP, LLC., HAD RELEASE OF ON UNLISTED HAZARDOUS WASTE CHARACTERISTIC OF IGNITABILITY. THE RELEASE WAS THROUGH A PRESSURE RELIEF VALVE AND LASTED FOR TWO HOURS. THE TOTAL AMOUNT RELEASED WAS 1,142, OF WHICH 36 POUNDS WAS BENZENE. UNLISTED HAZARDOUS WASTE CHARACTERISTIC OF IGNITABILITY IS A CERCLA HAZARDOUS SUB- STANCE WITH A REPORTABLE QUANTITY OF 100 POUNDS AND BENZENE IS A CERCLA HAZARDOUS SUBSTANCE WITH A 10 POUND REPORTABLE QUANTITY. THE FACILILTY CALLED THE NATIONAL RESPONSE CENTER ON OCTOBER 30, 1998, AT 10:45 AM.