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November 1990 -9- M88168D �) I CONCLUSIONS AND RECOMMENDATIONS SOIL CONTAMINATION Based on field observations and laboratory analytical results obtained from the soil samples collected during the implementation of this supplemental site assessment, coupled with the laboratory analytical results of the confirmatory soil samples previously collected following site remediation in the-vicinity of the former UST excavation, soil contamination resulting from the inadvertent release of hydrocarbon products into the subsurface in the area of I the former UST does not exist. Analytical data obtained from the confirmatory soil samples collected January 9, 1990, following the completion of the soils removal program, exhibited only trace concentrations of toluene and xylenes at concentrations well below DOHS applied action levels (SGD, 1990, pg.4) . During this assessment total xylenes and total lead were the only contaminant constituents detected at or / above the practical quantitation limits, and where detected were found in concentrations assumed to be ambient and inherent to the area. SGD recommends that no additional site characterization of hydrocarbon contaminated soil be conducted at the site, and that the site be granted closure status, in regards to soil contamination, by SJLHD. I GROUND WATER CONTAMINATION Four irrigation/domestic ground water wells are located within a 50 foot radius of the site and were sampled as per SJLHD requirements on January 9, 1990 (SGD, 1990, pg. 5) . All four wells contained trace concentrations of benzene and three contained trace amounts of toluene. Both constituents were present in concentrations well below the applicable DWS action levels. The laboratory analytical results obtained from the ground water sample collected during the implementation of this assessment indicated that none of the contaminants evaluated for exist in excess of the applicable DWS action levels.