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o One source of adsorbed-phase hydrocarbons appears to be <br /> the former leaking product pipelines identified by NDE <br /> Technology, Inc. , December 2, 1988 (Appendix H) . <br /> Another potential source is the fill riser (west end) <br /> of the former gasoline tank. Analysis of soil samples <br /> collected from 14 fbg at the fill riser end of the <br /> former gasoline tank detected 2 , 000 ppm of TPH-G <br /> (Appendix G) . It is likely the soil impacted <br /> by adsorbed-phase hydrocarbons is probably from <br /> overspill of the fill riser, and therefore of limited <br /> extent. <br /> o Ground water in the vicinity of the former underground <br /> fuel tank cavity and pump islands has been impacted by <br /> dissolved-phase petroleum hydrocarbons. <br /> o Based on available data on hydrogeologic conditions <br /> at the site and results of field activities and <br /> laboratory analysis, the extent of the dissolved-phase <br /> petroleum hydrocarbon plume cannot be assessed. <br /> ALTON GEOSCIENCE <br /> J <br /> Matthew A. Taylor <br /> Civil Engineer <br /> Matthew J opwood <br /> Supervis r, Sacramento Operations <br /> Pe&rCan , .G. 5089 <br /> AsNorthern California operations <br />