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i <br /> ' HEALTH RISK EVALUATION <br /> FORMER VALLEY VOLKSWAGEN SM <br /> 647 E. MINER AVE., STOCKTON, CA <br /> ' Ground Zero Analysis has prepared the following evaluation of human health risk associated <br /> with residual soil contamination at the site. Estimates of the mass of residual contaminants are <br /> also presented. <br /> ' HUMAN HEALTH RISK EVALUATION <br /> i ' The potential exists for human exposure to residual petroleum hydrocarbon contaminants at the <br /> site. A quantitive evaluation of the potential health risk resulting therefrom was conducted in <br /> order'to determine if the risk is significant. <br /> ' r in evaluating the risk. <br /> The sections below describe the processes and parameters used a al g <br /> Chemicals of Concern <br /> i <br /> Site characterization indicates that residual gasoline hydrocarbons are present in subsurface soil <br /> t in the immediate vicinity of the former underground storage tanks (USTs) at the site. The <br /> chemicals typically associated with gasoline that have the potential to pose a health risk consist <br /> of the aromatic hydrocarbons benzene, toluene, ethylbenzene, and xylenes. Of these, only <br /> ethylbenzene and xylenes have been detected in samples from the property. Nevertheless, due <br /> to the fact that some detection limits were elevated, risk was evaluated for each of the aromatics. <br /> Exposure Pathways <br /> ' The spectrum of possible exposure pathways at a given site for human receptors includes <br /> ingestion of contaminated soil or groundwater, dermal contact with and absorption of <br /> contaminants from soil or groundwater, and inhalation of vapors. Potential environmental <br /> ' receptors include wildlife and plantlife and the exposure pathways are similar. For a given site, <br /> one or more of these potential exposure pathways may exist and others may not. <br /> ' Site characterization indicates that no current environmental exposure pathways exist. The <br /> potential for leaching of soil contaminants to groundwater was not evaluated because recent <br /> groundwater sampling indicates that impact has not occurred nor is it expected to occur. <br /> ' Exposure pathways for Potential human receptors were evaluated to determine which should be <br /> evaluated for risk. <br /> ' vaUgyvwlreporla1rW.W <br /> 1 <br /> 1 <br />