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' 01 October 2004 AGE-NC Project No 95-0130 ' Page 4 of 6 ' 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES On 09 February 2004, a total of seventeen ground water samples were submitted to Cal Tech ' Environmental Laboratories(CTEL), a DHS-certified laboratory, for analysis referenced in Section 23 ' TPH-g was detected in water samples collected from wells MW-2, MW-3, MW-5, MW-6 (B - E), MW-7 (B - E), MW-8, VW-1C, VW-2A and VW--3A at concentrations as high as 130,000 micrograms per liter (µg/1) in the sample collected from VW-2A Benzene was detected In the above monitoring well samples at a maximum concentration of 64,000 µg/1 (VW-2A) Other BTEX compounds were detected in the above monitoring well samples at concentrations as high as 36,000 µg/l (toluene from VW-IC) MTBE was detected in ground water samples collected from wells MW-3, MW-6 (B, C and E), ' MW-7 (B - D) VW-1 C, VW-2A and VW-3A at concentrations as high as 2,900 µg/1 (MW-6B), 1,2-DCA was detected in ground water samples collected from wells MW-3, MW-S, VW-1C, VW-2A, MW-6B and MW-6C at concentrations as high as 290 µg/1 (VW-2A) 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 (Cal Tech Environmental Laboratories I D No 0402-033) and chain-of-custody forms are presented in Appendix C, GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix D On 19 February 2004, ground water samples collected from well MW-6E were submitted to CTEL for analysis referenced in Section 2 3 TPH-g and BTEX compounds were detected at concentratrations of 1,200µg/1 TPH-g, 160µg/1 benzene, 150µg/1 toluene,24µg/1 ethylbenzene and 110 µg/1 xylenes MTBE was also detected at a concentration of 14 µg/1 The laboratory reports (CTEL I D No 0402-122) and chain-of-custody forms are presented in Appendix C, GeoTracker confirmation pages of the submitted laboratory EDF files are included in Appendix D 4.0 SUMMARY AND CONCLUSIONS IThe implications from the February 2004 ground water monitoring event are as follows • Ground water flow direction within Hydrologic Units 1, 2 and 3 was inferred to be towards the east-northeast at a gradient of 0 005 feet/feet or less (Figures 3 and 4) Advanced GeoEnvi ron mental,Inc