04/27/92: IN MAY 1991, EPA INSPECTED THE JACOBS RANCH COAL MINE NEAR GILLETTE, WYOMING. DURING THE INSPECTION SEVERAL VIOLATIONS OF RCRA WERE OBSERVED, INCLUDING ILLEGAL DISPOSAL OF HAZARDOUS WASTE AND FAILURE TO PREPARE MANIFESTS. JACOBS RANCH MINE PERSONNEL WERE OBSERVED USING CHLORINATED SOLVENTS TO DEGREASE COAL TRUCK ENGINES, ALLOWIN ALLOWING THE SOLVENTS TO BE COLLECTED IN DRIP PAN AND THEN MIXING WITH AND DISPOSING OF THE HAZARDOUS WASTE AS WASTE OIL. SUBSEQUENT INFORMATION CONCERNING KERR-MCGEE'S NUMEROUS SHIPMENTS OF THIS HAZARDOUS WASTE WAS OBTAINED THROUGH RCRA SECTION 3007 INFORMATION GATHERING AUTHORITY.