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05 November 2002 <br /> AGE-NC Project No 96-0235 <br /> Page 4of5 <br /> MW-5, MW-6A, MW-6B, MW-7, MW-SA, MW-11B, MW-12B, MW-13B, EW-1 and EW-2 <br />' contained detectable concentrations of 1,2-DCA ranging from 0 66 µg/l (MW-6A) to 24 µg11 <br /> - (MW-11B) Concentrations of DIPE, ETBE, TAME and EDB were not detected above laboratory <br /> reporting limits in any of the water samples collected during the September 2002 monitoring event <br /> Analytical results of water samples collected during the third quarter of 2002 a're summarized on <br />' Table 2 and 3, analytical results from previous monitoring events are summarized on Tables 4 and <br /> 5 Figures 4 and 5 illustrate the ground water contamination plumes in upper and lower ground water <br /> intervals, respectively The laboratory report (MAI Lab IDs 0209018-001 through 0209018-020), <br />' chain-of-custody forms and the laboratory QA/QC report are included in Appendix B <br /> L <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the former UST No 3 area, AGE finds <br /> • Ground water within the lower monitored interval was inferred to flow in an inward-radiating <br /> pattern toward the south-southwest,ground water flow in the upper interval was towards the <br /> northeast to the east-southeast <br /> • TPH-g,TPH-d and BTEX compounds were detected in ground water samples collected from <br /> MW-1, MW-2 and EW-2 1,2-DCA was detected in ground water samples collected from <br />' MW-5, MW-6A, MW-6B, MW-7, MW-8A and EW-2 The petroleum-impacted ground <br /> water plume has remained relatively stable <br />' • MTBE was not detected in any of the ground water samples collected from the former UST <br /> No 3 excavation area <br />' * The lateral extent of the plume of impacted ground water is not well defined to the south <br /> Based on the data collected from the former UST cluster area, AGE finds <br /> Y Ground water flow in the area of the former UST cluster was generally toward the east in <br /> both the upper and lower monitored intervals <br />' • TPH-g was detected-in samples collected from MW-10, MW-11B and EW-1 at <br /> concentrations as high as 50,000µgll(EW-1) TPH-d was detected in samples collected from <br /> MW-9, MW-10, MW-I IB and EW-i at concentrations as high as 12,000 µg/1 (MW-10, <br />' EW-1) <br /> • BTEX compounds were detected in samples collected from MW-10, MW-11B and EW-1, <br /> the maximum BTEX concentrations were detected in the sample from EW-1 Concentrations <br /> rAdvanced GeoEnviron mental,Inc <br /> 1 <br /> t <br />