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' 19 March 2001 <br /> AGE-NC Project No 98-0492 <br /> Page 6 of 7 <br /> ' No other fuel oxygenated compounds were detected above laboratory reporting limits during the <br /> laboratory analysis of the ground water samples Analytical results of ground water samples are <br /> summarized in Table 3 The laboratory report (MAI Lab ID 58773 through 58777) and chain-of- <br /> custody <br /> hain-ofcustody forms are included in Appendix B <br /> ' 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected on 24 January 2001 and the previous investigations, AGE concludes the <br /> ' following <br /> • None of the soil samples collected during this investigation encountered petroleum <br /> ' hydrocarbons or fuel oxygenates The soil type is predonunantly sandy so it is possible that <br /> the petroleum hydrocarbons and MTBE detected In the soil samples collected beneath the <br /> dispenser islands(S-7 and S-9)have migrated to ground water,located approximately 18 feet <br /> ' below these sample locations <br /> • Ground water underlying the eastern portion of the site is impacted by low concentrations <br /> '. of TPH-d TPH-g, BTE&X and MTBE-impacted ground water was encountered in the <br /> southern most portion of the site in boring P-9 The source of gasoline contamination in the <br /> ground water at this location is anomalous The only location of TPH-g,BTE&X and MTBE <br /> ' impacted soil on the property Is located approximately 45 feet north of this boring Since the <br /> ground water flow direction is inferred to flow in a northerly direction, it is possible that the <br /> gasoline hydrocarbons detected in boring P-9 has an off-site source <br /> ' 0 None of the soil samples collected beneath and adjacent to the former UST area contained <br /> detectable concentrations of petroleum hydrocarbons,however, diesel fuel has been detected <br /> ' <br /> in the several ground water samples In this area It is possible that the diesel-impacted ground <br /> water in the former UST area has another source <br /> 5.0. RECOMMENDATIONS <br /> ' Based upon data collected from the site, AGE recommends <br /> ' • Advancement of additional probe soil borings to assess the vertical extent of petroleum <br /> hydrocarbon- and MTBE-impacted ground water nand the soil beneath the locations of soil <br /> samples S-7 and S-9 to locate the source of the contamination on-site <br /> ' • Installation of ground water monitoring wells to monitor the petroleum hydrocarbon- and <br /> MTBE-impacted ground water <br /> ' Advanced GeoE nviron mental,Inc <br />