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7 <br /> f CONCLUSION 7C,0+ IC <br /> (use'VP� �4Sl�i <br /> The findings of this investigation indicate the soils beneath the site consist mostly of low <br /> t <br /> permeability silty clay and clayey silt to the total depth investigated of 90 feet bgs A sand layer <br /> was encountered in each deep well that occurs between 70 and 75 feet bgs which was underlain <br /> by fine grained deposits typical of the upper section Groundwater occurs at approximately 75 <br /> 1 <br /> feet bgs and flows to the northeast under a gradient of 0 003 Groundwater was previously <br /> encountered at 50 feet bgs in 1988 <br /> ,h <br /> Soils immediately west of the tank cluster contain the highest concentrations of hydrocarbon <br /> The vertical distribution of hydrocarbon in this area is relatively uniform from approximately <br /> 40 feet bgs to the water table with a maximum measured concentration of 2,100 mg/kg TPH <br /> i; Soil samples from each.of the remaining boreholes drilled during this investigation contained 13 <br /> 1 mg/kg TPH or less These results suggest the bulk of hydrocarbon-affected soil is located <br /> 1 immediately adjacent to the underground tank cluster This hydrocarbon mass is relatively <br /> accessible with the existing wells at the site <br /> Groundwater samples from the site suggest the dissolved hydrocarbon mass is most concentrated <br /> along the west side of the property The plume extends eastward across the site to well MW3R <br /> I <br /> i� <br /> I ^', Page 9 <br />