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`. .a Color Spot, Inc. March 19, 1991 (M88168F) BACKGROUND A 4,000-gallon UST used to store diesel fuel was removed from the site on March 1, 1989, by Jim Thorpe Oil Company, Inc. The UST removal was observed and documented by SGD, Underground Storage Tank Removal, Color Soot, Lodi, Inc. , March, 1989. The soils surrounding the fill port and the southwestern corner of the UST were visibly stained and smelled of diesel fuel. Field monitoring with a photoionization detector (PID) also indicated elevated total petroleum hydrocarbon (TPH) concentrations. Soil samples collected after the UST was removed contained (laboratory analytical data) ethylbenzene, total xylene, and TPH concentrations in excess of applicable regulatory action levels. As a result of the soil contamination, SGD was retained by Color Spot, Inc. , to verify the existence of soil contamination, delineate the lateral extent of contamination, and to evaluate adjacent domestic ground water wells for contaminants associated with diesel fuel. SGD conducted a soil vapor survey August 15, 1989, under PHS-EHD permit 89-1857 and documented by SGD, Soil Vaoor Study. Color Snot Lodi, Inc. , October, 1989. Results of the survey indicated that the diesel fuel contami tion within the shallow subsurface (depth of 6 feet below ground surface) did nvE appear to have migrated laterally a significant distance beyond the tank excavation. The contamination appeared to be limited to the southwest corner of the excavation. The analytical results of the ground water samples collected by SGD from the domestic water wells at the site at that time indicated that ground water did not contain hydrocarbon contamination concentrations above regulatory action levels, but did contain trace concentrations of benzene and toluene. SGD implemented a site remediation program in January 1990, which was documented by SGD letter-report, Environmental Services, Site Remediation, Color Snot Lodi. Inc. , February 1990. Contaminated soils were excavated, removed, and disposed of off-site. As the soil was being removed, it was visually and olfactorially monitored, as well as monitored with a PID. After all obviously contaminated soil (by sight, smell, or PID reading) had been removed from the excavation, an additional 5 feet of soil was removed from the walls and floor to ensure complete remediation. Following the removal of the soil, confirmatory soil samples were collected from the walls and floor of the excavation. Analytical data obtained from the samples exhibited only trace concentrations of toluene and xylenes at concentrations well below regulatory action levels. Benzene concentrations were not detected at or above practical quantitation limits. Additionally at this time ground water samples were once again collected from the domestic water wells at the site and from irrigation/domestic wells located within a 500-foot radius of the site. Analytical data obtained from the ground water samples indicated that the ground water in the wells d`a not contain hydrocarbon contamination above State of California drinking wa J