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1_ <br /> for analyses of Total Volatile Hydrocarbons, EAB (ethylene <br /> dibromide) and Lead. A sixth soil sample was collected from the <br /> bottom of the excavation for the waste oil tank. This sample was <br /> analyzed for oil and grease and PCB's. The results of all the <br /> �Y analyses are presented in Table 1. <br /> CONCLUSIONS <br /> The initial hydrogeologic investigation for the Exxon <br /> f Service Station indicated a depth to groundwater of approxi- <br /> mately ..48 feet at the site. The aquifer is separated from <br /> surface. contamination and runoff by significant thicknesses of <br /> stiff, silty and, sandy clays. No hydrocarbon vapors were <br /> detected in either of the two monitoring well borings or four <br /> f - <br /> sail:borings. Minor amounts of soil contamination by hydro^ <br /> carbons were first detected on site during the excavation and <br /> i. removal of the product storage tanks and the waste rail tank. <br /> d_ <br /> i The results of the soil sample analyses indicated relatively low <br /> 0. <br /> levels of hydrocarbon and lead contamination except in the sample <br /> obtained from beneath the central storage tank. However, as <br /> previously discussed, the contaminated area was relatively :small <br /> r and .was. most likely. the result of occasional over filling of the <br /> storage tank. <br /> Since no hydrocarbons were detected in any of .the boreholes <br /> , . <br /> around the tank pit, the contamination appears to be limited to <br /> K. tank locations: <br /> 1 <br /> the backfill area of the original to The high . <br /> percentage of clay in the .soil probably contributed to this <br /> localization. Considering the limited extent and minor amounts <br /> E of contamination, the significant thicknesses of clay layers 3 <br /> underlying the site and the depth .to groundwater, it is Ground- <br /> s, <br /> water Technology's opinion that the possibility for <br /> migration of <br /> ' hydrocarbon products to the groundwater would be remote.. <br /> 1 <br /> I ill McKim <br /> s <br />