THE CASE SUMMARY CAN BE THE SAME FOR THIS AS FOR THE PREVIOUS YORK OIL COMPLAINT, EXCEPT THAT NOW THE PAST COST IS AT LEAST $5 MILLION; THIS COMPLAINT SEEKS RECOVERY OF ALL RESPONSE COSTS INCURRED BY THE UNITED STATES IN CONNEC- TION WITH THE FIRST OPERABLE UNIT AT THE SITE; AND THE DEFENDANTS IN THIS COMPLAINT ARE ALL COMPANIES WHICH ARRANGED FOR TREATMENT OR DISPOSAL OF HAZARDOUS SUBSTANCES WHICH WERE DISPOSED OF AT THE YORK OIL SITE. OPERATIONS AT THE YORK OIL SITE WERE COMMENCED BY PEIRCE BROTHERS OIL SERVICE IN 1953. THE SITE WAS OPERATED AS AN OIL WASHING FACILITY UNTIL 1965. THE OIL WASHING CONDUCTED AT THE SITE WAS ESSENTIALLY A RECYCLING PROCESS; AN OIL SLUDGE RESULTING FROM THIS PROCESS WAS DUMPED INTO ONE OF THREE UNLINED LAGOONS ON THE SITE. DURING THESE YEARS, WASTE OIL WAS COLLECTED BY NUMEROUS TRUCK DRIVERS IN THE NORTH EAST FROM INDUSTRIAL GENERATORS, GAS STATIONS AND CAR DEALERSHIPS. THE OIL COLLECTED BY THE DRIVERS WAS DEPOSITED AT VARIOUS PBOS STORAGE FACILITIES, INCLUDING THE CASTLETON AND CENTRAL SQUARE FACILITIES BEFORE BEING SHI PPED TO THE YORK OIL SITE FOR WASHING. OIL FROM THE VARIOUS SOURCES WAS MIXED TOGETHER AT THESE STORAGE FACILITIES. THERE ARE NO RECORDS OF WHERE THE OIL WAS PICKED UP, MUCH LESS THE AMOUNTS. ALTHOUGH OIL COLLECTED AT THE PBOS STORAGE FACILITIES WAS SHIPPED TO THE SITE, IT WAS ALSO SHIPPED TO WALTHAM, MASSACHUSETTS AND