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30 March 2005 • AGE-NC Project No 95-0130 Page 4 of 13 elevation at the site decreased an average of 0 79 feet between the September 2004 and December 2004 ground water monitoring events First zone (35 to 55 feet) ground water flow direction at the Top Filling Station was Inferred to be towards the northeast at an approximate gradient of 0 008 ft/ft,Second zone(55 to 85 feet bsg)ground water flow direction at the Top Filling Station was inferred to be towards the northeast at a gradient of 0 002 ft/ft or less The First and Second zone ground water elevation data collected during the December 2004 ground water monitoring event is depicted on Figures 3 and 4, respectively 2 4 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES On 03 December 2004, a total of fifteen ground water samples were submitted to CTEL, a DHS- certified laboratory, for the analysis referenced in Section 2 3 TPH-g was detected in thirteen water samples collected from wells MW-3, MW-5, MW-6 (B-E), MW-7 (B-D), MW-8, VW-1C, VW-2A and VW-3A at concentrations as high as 230,000 micrograms per liter(µg/1)in the sample collected from VW-2A 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 Benzene was detected in the above monitoring well samples at a maximum concentration of 35,000 µg/1 (MW-7B) Other BTEX compounds were detected in the above monitoring well samples at concentrations as high as 69,000 pg/l (toluene from VW-I C) MTBE was detected in ground water samples collected from wells MW-3, MW-6B, MW-7B, VW-I C, VW-2A and VW-3A at concentrations as high as 3,100 µg/1 (VW-3A) The estimated extent of First Zone and Second Zone dissolved MTBE are depicted in Figures 6 and 8,respectively 1,2-DCA was detected in ground water samples collected from wells MW-6(B-D),MW-7B,MW-8, VW-1C, VW-2A and VW-3A at concentrations as high as 83 µg/1 (MW-7B), TAME was detected in ground water samples collected from wells MW-3,MW-6B,MW-7(B-C),VW-I C,VW-2A and VW-3A at concentrations as high as 100 gg/l (MW-7B) 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 Ereports(CTEL Laboratory I D 0412-030)and chain of custody forms are presented in Appendix C, GeoTracker confirmation pages of the submitted laboratory electronic deliverable format(EDF)files and depth to water measurements are included in Appendix D I Advanced GeoEnvironmental,Inc i