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15 <br /> 8 0 CONCLUSIONS <br /> The results of our investigation of the Site indicate that ground water in <br /> the area of <br /> the former tanks does not appear to be impacted, but that soils at the Site may <br /> require additional remediation Lithological data suggests that there is a <br /> distinct clay <br /> layer between the upper vadose zone soils and the ground water aquifer at the site <br /> Accordingly, wells were installed so that they were either screened in the vadose zone <br /> or the ground water aquifer to avoid the possibility of creating a vertical conduit <br /> between the upper zone and the ground water <br /> Laboratory results of ground water samples indicate _ <br /> p cate that TPH G, benzene, toluene, <br /> ethylbenzene, and EDB are not present in the ground water at the Site Xylenes were <br /> detected in Well W-3, but just above detection levels Ground water from Well W-5 <br /> was found to contain coliform and fecal coliform, which indicates a possible sewer <br /> 1P system leak It is possible that the County may require continued monitoring of this <br /> well or they may require that the well be destroyed <br /> TPH-G concentrations in soil samples collected from W-2 and W-4 were at or above <br /> the recommended 100 ppm cleanup level listed in the California Leaking Underground <br /> Fuel Tank (LUFT) Manual and will likely require additional remediation As indicated <br /> in samples collected at the time of the tank removal and the subsequent Soil Vapor <br /> Survey, soil contaminants appear to be limited to the area near the pump islands <br /> Fortunately, it appears that the clay layer under the Site is acting as an aquitard and <br /> has prevented contaminants in the upper zone soils from affecting the ground water <br /> PLVW 191 8345REPORTSISITE ASSVMANTECASMANTECA RPT fApr 26 931 <br /> Cavo ni e E nv i r on menta I <br />