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1 <br /> t19 November 2004 <br /> AGE-NC Project No 99-0559 <br />' Page 6of7 <br />' xylenes in sample MW-7E The fuel additives MTBE and 1,2-DCA were detected in sample MW-7E <br /> at concentrations of 43 µg/1 and 9 6 gg/1, respectively <br />' The analytical results of current and historical ground water samples are summarized in Table 2 The <br /> laboratory reports (CTEL Project No CT214-0409107), quality assurance and quality control <br /> (QA/QC)reports and chain of custody forms are included in Appendix B GeoTracker confirmation <br />' pages of the submitted laboratory electronic deliverable format (EDF) files are included in <br /> Appendix C <br />' 4.0 SUMMARY AND CONCLUSIONS <br />' Based on data collected during the monitoring event, AGE concludes <br /> • The general ground water flow direction was towards the north during the third quarter <br />' a During the quarter the highest concentrations of petroleum hydrocarbons detected at the site <br /> were present in the ground water samples collected from wells screened in HU3 at the east <br />' . edge of the UST area The HUI and HU2 interval normally contains the highest petroleum <br /> hydrocarbons concentrations, but this interval was dry at the time of the September 2004 <br /> monitoring event <br />' 0 During third quarter 2004, the concentrations of petroleum hydrocarbons decreased or <br /> remained stable in multilevel wells MW-5 through MW-7 <br />' 0 1,2-DCA was detected in samples from the former UST area, and detected in one sample <br /> down-gradient of the UST area(MW-6) <br />' & The vertical extent of impacted ground water, has been defined at the perimeter of the site, <br /> the vertical extent of impacted ground water at the western and southern edge of the site are <br /> defined by well MW-5, and to a lesser degree by MW-6 The vertical extent of impacted <br />' ground water, at the former UST area,has not been defined and extends beyond the vertical <br /> depth of well MW-7E <br />' a The lateral extent of shallow, impacted ground water towards the west and southwest, down- <br /> gradient of the UST area, has not been defined <br /> 5.0 RECOMMENDATIONS <br /> Based on the findings and conclusions in this report, AGE recommends the following <br /> Advanced GeoEnvironmental,Inc <br />