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4� <br /> Monitoring Well Installation Report - Chevron Service Station t/9-3232 <br /> November 20, 1998 <br /> Stockpile Analytical Results <br /> Petroleum hydrocarbons wete not detected in stockpile sample SSI A thtough D <br /> DISCUSSION <br /> Based upon the analytical data collected dui ing this phase of Investigation, soil southwest of the <br /> western dispenser Island has been Impacted by concentrations of TPHg and benzene, at depths <br /> greater than 20 feet bgs These concentrations appear to increase with depth Furthermore, low <br /> concenti atlons of TPHg and benzene were detected at 49 S feet bgs adjacent to the southeast <br /> corner of the gasoline USTs <br /> Groundwater beneath the site has been impacted by petroleum hydrocarbons TPHg and benzene <br /> concentrations were detected north and southwest of the dispensei islands, and southeast of the <br /> gasoline USTs MTBE was not detected Groundwater flow is to the southwest Highest <br /> dissolved hydiocarbon concentrations were detected in well MW-2 downgradient of the dispenser <br /> islands, and well MW-3 adjacent to the gasoline UST pit <br /> 34(463 01-2 5 <br />