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Y ' 03 December 2004 AGE-NC Project No 95-0104 Page 3 of 4 ' were not detected at or above laboratory reporting limits in the ground water samples collected from the site Analytical results of the ground water samples are summarized in Table 2 The laboratory report(MAI Work Order Number 0409435),quality assurance/quality control(QA/QC)reports and ' chain of custody forms are presented in Appendix B GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are Included in Appendix C 4.0. DISCUSSION AND CONCLUSIONS ' Based on data collected during the September 2004 sampling event, AGE concludes • The ground water flow direction on 27 September 2004 was Inferred to be towards the north ' under an average gradient of 0 007 foot/foot • 1,2-DCA was detected in the water samples collected from MW-4, MW-5 and MW-6 at concentrations ranging from 0 83 pg/1(MW-4)to 13gg/1(MW-5) TPH-g,BTEX and other fuel additives were not detected at or above laboratory reporting limits in the ground water samples collected from the site • Concentrations of 1,2-DCA have decreased to non-detect In the samples collected from well MW-1,Increased to 0 83 µg/1 in the samples collected from well MW-4,and remained stable in samples from wells MW-5 and MW-6 Figure 4 Illustrates the approximate extent of 1,2- DCA-impacted ground water The lateral extent of 1,2-DCA impacted ground water has been generally defined The vertical extent has been defined 5.0. RECOMMENDATIONS I Based on the g findings of this investigation AGE recommends • Further assessment of the 1,2-DCA Impacted-ground water • Due to the proximity of the nearest receptor, preparation of an Interim remedial plan to mitigate the 1,2-DCA-Impacted ground water Initiation of a semi-annual monitoring program, the next monitoring event should be performed in March 2004 I • Advanced GeoEnviro n mental,Inc I