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April 28, 1988 AGS job No. 038012-1 <br /> Former UNOCAL Service Station, Stockton, California <br /> In response to these initially detected hydrocarbon contamination <br /> levels, further excavation of the gasoline tank cavity to a total <br /> depth of approximately 30 feet was undertaken as requested by <br /> UNOCAL and approved by the SJLHD. This is the approximate depth <br /> of the ground--water surface at the site, and ground water entered <br /> the cavity several hours after excavation was completed. <br /> Although levels of remaining hydrocarbon contamination below the <br /> former tanks are low (sample 5-0406-13A, Table 1) , the proximity <br /> to the ground-water table and levels of contamination remaining <br /> in they excavation sidewalls imply a need for further site <br /> assessment. With the authorization of UNOCAL Corporation, <br /> Applied GeoSystems is currently preparing a proposal which <br /> presents a program for the delineating the vertical and lateral <br /> extent of contamination. The purpose of the proposed <br /> ~ investigation would be to assess whether the presence of <br /> contaminants has had, or is likely to have, an adverse impact on <br /> local ground-water resources. <br /> LIMITATIONS <br /> This report was prepared in accordance with generally accepted <br /> standards of environmental geological practice in California at <br /> the time this investigation was performed.- This-investiga ion---- --- <br /> 9 <br /> ,4pp,11ed GeOSysAMS <br />