THIS PRE-REFERRAL INVOLVES THE FILING OF A CIVIL ACTION TO SEEK RESPONSE COSTS AND INJUNCTIVE RELIEF PURSUANT TO 106, 107, & 122 OF CERCLA. UNION PACIFIC RAILROAD (UPRR) OPERATES A TRAIN ASSEMBLEY AREA, A FUELING STATION, DIESEL REPAIR SHOPS, CAR WASHING AREAS, AND A TRUCK MAINTENANCE SHOP AT THIS SITE IN POCATELLO, ID. THE ACTUAL NPL SITE IS NON-LINED SLUDGE PIT LOCATED WITHIN THE RAILROAD BOUNDARIES. THE PIT WAS USED FROM 1961 TO 1983 FOR DISPOSAL OF SLUDGES GENERATED FROM AN ON SITE WATER TREATMENT PLANT, WHICH COLLECTS RUNOFF FROM ALL RAILROAD CATCH BASINS AND MAINTENANCE BUILDING FLOOR DRAINS. APPROXIMATELY 3,000 GALLONS/WEEK OF SLUDGE FROM THE TREATMENT PROCESS WAS DISPOSED OF INTO THE UNLINED PIT FROM 1961 TO 1983. UPRR THE ONLY IDENTIFIED PRP FOR THE SITE, ENTERED INTO A CONSENT ORDER WITH EPA IN JUNE 1988 TO CONDUCT A REMEDIAL INVESTIGATION/FEASIBILITY STUDY (RI/FS) FOR THE SITE. A PROPOSED PLAN WAS PRESENTED FOR PUBLIC COMMENT ON JUNE 3, 1991. A RECORD OF DECISION (ROD) IS EXPECTED TO BE SIGNED IN SEPTEMBER 1991. THE PREFERRED REMEDIAL ALTERNATIVE FOR THE SITE CONSISTS OF EXCAVATION OF THE SLUDGE AND UNDERLYING SOIL AND REMOVAL TO AN APPROVED OFF SITE DISPOSAL AREA, BACK FILLING AND PLACEMENT OF A LOW PERMABILITY CAP OVER THE PIT BOUNDARY, FLUSHING OF CONTAMINATED SOILS AND TREATMENT OF THAT WATER IN THE EXISTING WATER TREATMENT PLANT, TREATMENT OF CONTAMINATED GROUND WATER FORM THE