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I ' 12 July 2006 • AGE-NC Project No 95-0130 ' Page 4 of 14 I at the site increased an average of 125 feet between the December 2005 and the February 2006 ground water monitoring events First zone(HU1 -40 to 55 feet) ground water flow direction at the Top Filling Station was inferred to be towards the north-northeast at an approximate gradient of 0 02 ' ft/ft, Second zone(HU2 and HU3 - 55 to 85 feet bsg)ground water flow direction at the Top Filling Station was inferred to be northeast at an approximate gradient of 0 005 ft/ft or less The First and Second zone ground water elevation data collected during the February 2006 ground water Imonitoring event is depicted on Figures 3 and 4, respectively ' 2 4 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES On 28 February 2006, a total of sixteen ground water samples were submitted to CTEL, a DHS- certified laboratory, for the analysis referenced in Section 2 3 TPH-g was detected from wells MW-6(B-E), MW-7(B-E), MW-8, VW-1C, VW-2A and VW-3A ' at concentrations as high as 260,000 micrograms per liter (µg/l) in the sample collected from MW-713 The estimated extent of First Zone(between 35 and 55 feet bsg)and Second Zone(between 55 and 80 feet bsg) dissolved TPH-g are depicted in Figures 5 and 7, respectively • BTEX concentrations were detected in the above monitoring samples les at maximum p concentrations of 46,000µg/1 benzene,21,000µg/1 toluene,5,400µg/1 ethylbenzene and 22,800 dig/l xylenes from well MW-713 ' MTBE was detected in ground water samples collected from wells MW-6 (B-E), MW-7 (B, C, E), VW-1C, VW-2A and VW-3A at concentrations as high as 13,000 µg/1 (MW-6B) The estimated extent of First Zone and Second Zane dissolved MTBE are depicted in Figures 6 and 8,respectively r1,2-DCA was detected in ground water samples collected from wells MW-6 (B-E),MW-7 (B-E), MW-8, VW-1C, VW-2A and VW-3A at concentrations as high as 190 µg/l (MW-6B) TAME was detected in ground water samples collected from wells MW-6 (B, C),MW-7 (B-E), VW-1C, VW-2A and VW-3A at concentrations as high as 240 pg/1 (MW-6B) DIPE was detected in ground water samples collected from wells MW-6B, MW-713 and VW-2A at concentrations as high as 6 6 pg/1 (MW-6B) No other fuel components were detected in the ground water samples Previous and current analytical results of ground water monitoring well samples are summarized in Tables 3 and 4 The laboratory ' reports(CTEL Laboratory I D 0603-002)and chain of custody forms are presented in Appendix B, Advanced GeoEnvironmentai,Inc