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Color Spot, Inc. March 19, 1991 (M88168F) CONCLUSIONS AND RECOMMENDATIONS SOIL CONTAMINATION Based on field observations and laboratory analytical results obtained from the soil samples collected during the implementation of environ- mental services in the vicinity of the former UST, soil contamination resulting from the inadvertent release of hydrocarbon products into the subsurface in the area of the former UST no longer exists. 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 PHS-EHD. GROUND WATER CONTAMINATION Four irrigation/domestic ground water wells are located within a 500- foot radius of the former UST and were sampled as per PHS-EHD requirements �^ / January 9, 1990. All four wells contained trace concentrations of benzene 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 the most recent site assessment (October 1990) indicated that hydrocarbon contamination at the ground water does not exist at detectable concentrations in the vicinity of the former UST. Benzene was found in trace concentrations in the January 9, 1990, irrigation/domestic ground water well samples. However, benzene concentrations were not detected in any of the following: • Confirmatory soil samples collected from the floor and walls of the UST excavation on January 9, 1990, • Soil samples collected during the supplemental site assessment (October 8 and 9, 1990) , and • Ground water sample collected from within the hollow stem auger during the supplemental site assessment (October 8 and 9, 1990) .