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ATTORNEY-CLIENT PRMLEGE <br /> 5.0 CONCLUSIONS <br /> The purpose of this report is to demonstrate that the Santa Fe Railway Company Site in <br /> Stockton, California is suitable for closure A risk assessment demonstrated that petroleum <br /> hydrocarbons in the soil at the Site will not impact the groundwater beneath the Site and do <br /> not pose a threat to either groundwater resources or human populations Although <br /> hydrocarbons have been detected in the groundwater, analyses using chromatography of soil <br /> and groundwater samples have shown that it is not likely that these hydrocarbons are Site- <br /> related. In addition, it is not likely that Site-related chemicals in the soil would result in only <br /> random detections in the groundwater The chemicals have been present for a long time; it <br /> would therefore be expected that petroleum hydrocarbons would be detected on a regular <br /> rather than random basis It is most likely that the hydrocarbons in the groundwater are <br /> from the native soil and represent background water quality in the area Therefore the Site <br /> should be closed with the hydrocarbons left in place as they do not pose any significant risk <br /> to human health or the environment <br /> } <br /> G VDELMONTWLOSURE 3%4M10MD11?Or 8 <br />• <br />