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I EVAX Project B239-02 April 7, 1992 <br /> 10 <br /> WELL ELEVATION SURVEY <br /> EVAX subcontracted Schack & Company, Inc. of Tracy, California to <br /> survey the elevation of the wellheads relative to a nearby City of <br /> i1 Tracy bench mark. The well survey was conducted on March 27, 1992 and <br /> wellhead elevations were measured in feet above mean sea level . The <br /> well survey report is presented in Appendix D. <br /> SOIL CUTTINGS AND WELL WATER <br /> M Soil cuttings from the borings were placed in an enclosure of visqueen <br /> sheeting at the north part of the site. Water generated by well <br /> installation and development, sampling activities, and equipment <br /> cleaning was placed in 55-gallon capacity steel drums. The drums were <br /> sealed, labeled as to contents, and placed for temporary storage at the <br /> north part of the site. There are currently 3 drums at the site with a <br /> I total of approximately 100 gallons of water. <br /> FINDINGS <br /> Soil Conditions <br /> I. The borings transected silty clay of approximately 9 feet thickness <br /> and, followed below by, clayey to silty sand of approximately O, feet <br /> thickeness. At a depth of approximately 15 feet below ground surface, <br /> the borings transected coarse sand followed below by gravelly sand and <br /> sandy gravel . Shallow groundwater level at the site is currently at a <br /> depth of approximately 8 feet below ground surface. Soil data are <br /> I summarized in the Logs of Borings/Wells, Appendix B. <br /> Laboratory Analyses - Soils <br /> Soils impacted by gasoline hydrocarbon products were found at MW-2 and <br /> MW-3 in the 7 to 16 feet depth interval . Maximum hydrocarbon <br /> concentrations were found in Sample B3-15.5 at MW-3: 616 ppm TPHg, 18.0 <br /> ppm benzene, 4.0 ppm toluene, 7.7 ppm ethylbenzene, and 27.0 ppm total <br /> xylenes. Hydrocarbon impacted soils at MW-1 were localized at <br /> approximately groundwater level in the 8 to 9 feet depth interval . <br /> Laboratory analyses results of Sample BI-W were: 30.5 ppm TPHg, <0.005 <br /> ppm benzene, <0.005 ppm toluene, <0.005 ppm ethylbenzene, and 0.9 ppm <br /> i total xylenes. Laboratory analyses results are summarized in the <br /> attached Table 2. <br /> I <br /> 1 <br /> -6- <br />