IN 1988, A REMEDIAL INVESTIGATION AND FEASIBILITY STUDY (RI/FS) OF PCB CONTAMINATION WAS COMPLETED FOR THE SITE. BASED ON THE RESULTS OF THE FS, A JUNE 1988 ROD ISSUED BY EPA IDENTIFIED STABILIZATION/CONSOLIDATION OF THE PCB-CONTAMINATED SOIL AND DEBRIS AS THE PREFERRED TREATMENT ALTERNATIVE. A TREATABILITY STUDY WAS UNDERTAKEN DURING 1989-1990. THE STUDY INDICATED THAT THE CHOSEN REMEDY FAILED TO MEET SEVERAL IMPORTANT PERFORMANCE CRITERIA. THE STUDY ALSO REVEALED THE POTENTIAL PRESENCE OF LEAD (PB) ABOVE RECOMMENDED HEALTH-BASED LEVELS. SOIL SAMPLES, COMPOSITED FROMFOUR ON-SITE AREAS AND TWO OFF-SITE AREAS, WERE ANALYZED FOR PB IN ADDITION TO PCBS. LEAD CONCENTRATIONS FROM ON-SITE SOILS SAMPLES RANGED FROM 2,640 TO 55,900 PPM. EPA DETERMINED THAT FURTHER EVALUATION OF SITE SOILS WAS NECESSARY TO ESTABLISH THE EXTENT OF THE LEAD CONTAMINATION. ADDITIONAL SOIL AND GROUNDWATER SAMPLING WAS UNDERTAKEN FOLLOWING REVIEW OF THE DATA FROM THE TREATABILITY STUDY. IN OCTOBER 1990, THE RESULTS FROM EPA'S AUGUST 1990 SAMPLING OF SITE SOILS (INCLUDING THE OPERATING PACIFIC STEEL RECYCLING FACILITY ADJACENT TO THE UNION PACIFIC PROPERTY) CONFIRMED THE PRESENCE OF EXTENSIVE LEAD CONTAMINATION ABOVE SAFE LEVELS. ADDITIONAL SAMPLING WAS PERFORMED IN MAY 1991 WHICH INDICATED LEAD CONCENTRATIONS IN ON-SITE SOILS RANGING FROM 67.4 PPM TO 6