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S E C 0 R <br /> Conceptual Site Model <br /> Chevron Service Station#9-6171 <br /> March 25, 2005 <br /> Page 36 <br /> Four City of Stockton Water Department or the California Water Service Company <br /> municipal drinking water wells #1953, 1956, 1958, and 23183 are located downgradient <br /> from this active Chevron service station 9-6171 However, based on the results of <br /> groundwater flow and transport modeling, it appears that the petroleum hydrocarbon plume <br /> would reach equilibrium between release and attenuation due to dispersion and <br /> biodegradation before it reached any municipal or private wells Therefore, dermal contact <br /> and Ingestion of groundwater is an incomplete pathway <br /> Results of the Tier 2 risk assessment Indicated that exposure of onsite workers to residual <br /> soil vapors would not pose a significant risk Therefore, the exposure pathway Is <br /> Incomplete <br /> N 1FdeslProjects\Chevron\Retaill#9-6171\Site Conceptual ModelTINAL_CSM doc <br />