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' 25 September 2000 <br /> AGE-NC Project No 97-0326 <br /> Page 3 of 4 <br /> µg/1, 4,000 µg/I and 22,000 µg/l, respectively(MW3) <br /> MTBE was detected in MWI and MW3 at concentrations of 740 µg/l and 470 µg/l, respectively <br />' TBA was also detected in MW 1 and MW3 at concentrations of 1,400 µg/1 and 260µg/l,respectively <br /> DIPE, ETBE, and TAME were not detected at the site Analytical results of water samples are <br /> summarized on Table 2 The laboratory report(Alpha Analytical Order Number A00032811),chain- <br /> of-custody form and QA/QC are included in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br />' Based on the data collected from the site, AGE finds <br /> • The calculated ground water flow at the site has been toward the south during the four <br />' monitoring events conducted, however, the historical ground water flow at the USA site, <br /> adjacent to the east, has been toward the east to northeast <br /> • Very high concentrations of petroleum hydrocarbons were detected In ground water samples <br />' collected from all three monitoring wells Installed at the site <br /> • Neither the vertical nor horizontal extent of impacted ground water has been delineated at <br /> the site <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> • Continuation of quarterly ground water monitoring, as required by the PHS-EHD <br />' • Installation of additional monitoring wells to complete the assessment and to monitor <br /> impacted ground water as outlined in the Work Plan Addendum -September 1999,prepared <br />' by AGE,and approved by the PHS-EHD <br /> • Installation of additional soil borings as needed to delineate the vertical and horizontal extent <br /> of impacted ground water <br /> • <br /> Advanced GeoEnvironmentul,Inc <br /> 1 <br />