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Site Background Information: Chapin Brothers Investments, Inc. <br /> Page 18 of 19 <br /> • The highest concentration of benzene was detected in sample CB7-24, collected from the <br /> vertical depth of 20 feet bsg south of the former 8,000-gallon easternmost USTs. Benzene <br /> concentrations were not detected above the saturated zone. <br /> • MTBE and other fuel additives were not detected in the soil samples. <br /> • The analysis of soil samples collected from beneath the on-site garage building suggests that <br /> the vertical and lateral extent of impacted soil is defined. <br /> • The average ground water level has decreased from a high of 9 feet in April 2000 to <br /> approximately 17 feet below the top of the casing in November 2003.The decrease in water <br /> depth may have reduced the volume of water each extraction well can produce,and possibly <br /> caused lower dilutions of the extracted ground water, thus causing contaminant <br /> concentrations in extraction wells to remain significant, when compared to the lower <br /> concentrations of contaminants detected in the monitoring wells. <br /> Advanced GeoEnvironmental,Inc. <br />