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Kennedy/Jenks Consultants <br /> PRIVILEGED & CONFIDENTIAL <br /> 5.0 CONCLUSIONS <br /> The data collected as part of this soil gas survey verified the presence of PCE and other <br /> HVOCs in soil gas samples collected from the Site. The elevated concentrations of PCE <br /> detected in the soil gas samples are not unexpected given the findings of previous <br /> investigations conducted in the vicinity of the Beckman Building. The presence of an area <br /> with high PCE concentrations in shallow soil and soil gas samples immediately south and <br /> adjacent to the Beckman Building may be attributable to a localized surface release of <br /> PCE. However, because of the elevated concentrations of PCE throughout the area, the <br /> data collected with this soil gas survey can not conclusively substantiate or invalidate local <br /> oral history identifying the Beckman Building as a source of PCE to soil (and groundwater) <br /> in the area. <br /> To substantiate the findings of this investigation and to further define the possibility of a <br /> surface release of PCE to soils immediately south of the Beckman Building, <br /> Kennedy/Jenks recommends conducting an additional soil gas survey in this area. The soil <br /> gas survey should be conducted on a tight grid pattern (approximately 5 feet on center) <br /> with soil gas samples collected at frequent intervals bgs (such as 1 foot, 2.5 foot, 5 foot, <br /> 7.5 foot, 10 foot, continue with 5 foot intervals to groundwater). Confirmatory bulk soil <br /> samples should be collected for laboratory analysis as part of this additional soil gas <br /> survey. Permits for this additional soil gas survey would need to be obtained from <br /> SJCEHD. <br /> _.��3:W AM o 952704.01 <br /> 6;yoo ki495952704.01Uoa-MCd« <br />