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8820011ST1 CON W odward•Clyde Consultants <br /> 6.0 SUMMARY <br /> The results of this study are summarized as follows: <br /> • Laboratory chemical analyses of soil samples detected benzene in <br /> soil boring C-Q from 19 to 20.5 feet (0.12 ppm) and from 29 to 30.5 <br /> feet (0.06 ppm) . Benzene and the remaining chemical compounds <br /> analyzed for were not detected in any of the other soil samples <br /> submitted to I.T. Corporation. <br /> • The site is immediately underlain by native soils consisting <br /> predominantly of interbedded clay and silt with occasional <br /> interbedded sand to a depth of at least 45 feet below grade. <br /> • At least 22 documented groundwater wells lie within a one-half mile <br /> radius of the study site. Of the 22 documented wells, 8 wells lie <br /> �y downgradient of the site and one well is located in the northwest <br /> corner of the site. The closest off-site well lies approximately <br /> 500 feet to the south. <br /> Groundwater was not encountered to a depth of 45 feet while <br /> drilling. The chemical quality of the groundwater beneath the site <br /> i is unknown. Using groundwater well data from 1980, Brown and <br /> Caldwell (1985) indicate that the groundwater gradient beneath the <br /> site slopes gently to the south. <br /> 7.0 LIMI ATIONS <br /> Thi stud wa performed u er contract wi Gettler-Rya Inc. and within <br /> y p <br /> the slope outli d by Chevron SA Inc. The ope of the fi ld <br /> investig tion was imited to exp oration of sha ow soils for vidence of <br /> petroleum p oduct co `urination. e possible pre ce or absent of any <br /> �i <br /> 7 <br />