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lie 08 August 1997 <br /> AGE-NC Project No 97-0326 <br /> Page 3 of 4 <br />' concentrations as high as 63 ppm Benzene and MTBE were not detected in any of the samples <br /> analyzed Petroleum hydrocarbons were not detected in samples analyzed from probings B 1, 133 or <br /> 134 Analytical results of soil samples are summarized on Table 1 The laboratory report(AAL Batch <br />' No 97-0624-017) and chain-of custody form are included in Appendix B <br />' 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br />' Petroleum hydrocarbons were detected in probing B2 in samples collected at depths of 30 <br /> and 40 feet bsg, indicating that this interval has been impacted by hydrocarbons Field <br />' observations indicated low concentrations of hydrocarbon vapor in soil samples collected at <br /> depths of 15, 20 and 25 feet bsg in that probing The impacted interval could repre"ent a <br />' "smear zone 'as a result of fluctuation in ground water-elevation of the perched ground water <br /> "aquifer ', spreading liNdrocarbons in the upper portion over that interval The source of <br /> hydrocarbons has not been determined it is our understanding that the current tanks were <br /> not the original tanks on the property The location of the original tanks is -.urrently <br />' unkno,An It is likely that the location of the original tanks, which is currently unknown or <br /> the fuel dispensers area could be the source area(s) of the hydrocarbon impact in that deeper <br />' interval <br /> • Petroleum hydrocarbons were not detected in the sample collected from a depth of 45 feet <br /> in probing 132, defining the vertical extent of impacted soil beneath the USTs <br /> • Relatively low concentrations of BTE&X were detected in samples containing petroleum <br /> hydrocarbons, indicating that the release is likely not recent,further enhancing the possibility <br />' of releases from the original tanks <br /> • Saturated conditions v ere encountered in a sand unit at a depth of 40 feet However, this <br />' water appeal s to occur in a perched "aquifer", due to dense and only damp silt encountered <br /> at 45 feet bsg First encountered ground water occurs at a depth of approximately 55 to 60 <br /> feet bsg in monitoring ,Hells located approximately 90 east of probing 132 <br />' 60 RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends the following <br />' The location of the potential original tanks should be investigated followed by additional <br /> subsurface sampling/analysis in that area <br /> tAdvanced CcoEnN ironmental,inc <br />