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i <br /> 30 July 2003 <br /> AGE-NC Project No 99-0584 <br /> Page 7of8 <br /> 3 2 2 Analytical Results of Water Samples <br /> I <br /> There were no reported detections of TPH-g,TPH-d,DIPE,ETBE,TAME,TBA,or lead scavengers <br /> in any of the ground water samples analyzed Benzene was only detected in well MW-1 at <br /> 0 56 microgram per liter(jig/1) MTBE was detected in well MW-1 at a concentration of 10 µg11 <br /> Analytical results from ground water samples are summarized in Tables 3 and 4 The laboratory <br /> reports (MAI Laboratory ID 0304433, quality assurance and quality control (QA/QC) reports and <br /> chain-of-custody forms are included in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br /> • The ground water flow direction in April 2003 at the site was inferred to be toward the <br /> northeast at a gradient of approximately 0 003 ft/ft, which is consistent with prior ground <br /> water flow directions and gradients <br /> Ground water monitoring data to date indicates that MTBE is the only contaminant of <br /> concern at the site, detected during four of seven monitoring events at low concentrations, <br /> MTBE concentrations exceeded the Secondary MCL twice(in March 2002 and April 2003) <br /> and the Primary MCL onetime(16 gg/I in March 2002) The mass of dissolved MTBE is not <br /> readily determinable due to the limited detections and low concentrations, however, the <br /> consistently low concentrations of MTBE in only one well indicate a small, stable <br /> contaminate plume <br /> • During the April 2003 monitoring event, hydrocarbons and most fuel additives were not <br /> detected in the ground water sample collected from the monitoring wells MTBE was <br /> detected in one well at low concentrations, similar to previous detections <br />' • Volumetric calculations of MTBE concentrations over a 1900 fl area estimated that the <br /> amount of MTBE in soil is approximately 0 44 pound (lb) <br /> • The sensitive receptor survey identified six domestic wells within a 2,000-foot radius of the <br /> site,the two nearest wells appeared to be cross-gradient to the site and beyond the limits of <br /> soil and ground water contamination at the site <br />' Advanced GeoEnvironmental,Inc <br /> I <br />