SEVERAL ACR ACFT AT ORD ARE SVCED WITH CONTAMINATED OIL.

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ENG OIL TANKS WERE BEING SVCED BY AIRLINE -- PERSONNEL DURING THE AFTERNOON SHIFT ON MAY/SUN/92 WITH AN OIL SVC TRUCK. IT WAS DISCOVERED THAT THE TRUCK CONTAINED A BARREL OF CONTAMINATED OIL. THE BARREL WAS INSTALLED BY A FUEL SVC DEPT FUELER AND MYSELF. ON THE NIGHT SHIFT BEGINNING ON MAY/SAT/92; A NIGHT SHIFT MECH HAD TAKEN THE BARREL OUT OF STORAGE AND PREPARED IT WITH THE FITTINGS. THE MECH WAS THEN REASSIGNED TO ANOTHER JOB. THE FUEL SVC EMPLOYEE AND I THEN INSTALLED THE BARREL ON THE TRUCK. THE CONTAMINATION WAS DISCOVERED ON A LATER SHIFT THAT DAY; DURING THE SVCING TO A COMPANY ACFT. THE WDB X AND THE LGT Y HAD ALREADY BEEN SVCED. BOTH PLANES WERE AIR-INTERRUPTED FROM ORD. THE CONTAMINATED BARREL HAD BEEN TAKEN FROM A STORAGE AREA WHERE THERE ARE NUMEROUS IDENTICAL BARRELS; SEALED AND UNSEALED; FULL AND EMPTY; WITH CAPS TIGHT AND LOOSE CAPS. ALL OF THESE BARRELS HAVE THE IDENTICAL MANUFACTURER; OIL TYPE AND MARKINGS. THE SOLUTION TO THIS PROBLEM WOULD BE SEPARATE DESIGNATED AREAS FOR SEALED BARRELS AND OPENED BARRELS. BOTH THE AREAS AND THE BARRELS SHOULD BE LABELED ACCORDINGLY SO THAT EMPLOYEES CAN EASILY DETERMINE WHICH BARRELS ARE SAFE TO USE.