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L 1 i it 15 June 2004 AGE-NC Project No 96-0254 Page 3 of 4 The ground water flow direction at the time of the Fourth Quarter 2003 sampling event was inferred to be toward the north-northeast at an average hydraulic gradient of 0 005 foot/foot (Figure 3) During the First Quarter 2004 sampling event, ground water flow was inferred to be towards the north-northwest at an average gradient of 0 004 ft/ft(Figure 4) Data from the deeper-screened well MW-2A was not used to determine the ground water gradient for either monitoring event 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES The following summary of laboratory results includes the results from the Fourth Quarter 2003 and First Quarter 2004 monitoring events 3 2 1 Fourth Quarter 2003 Laboratory Results TPH-g,BTEX compounds and fuel additives were detected only in ground water samples collected from wells MW-4 and MW-7 TPH-g was detected at concentrations of 360 micrograms per liter . (µg11) from MW-4 and 2,800 µg/1 from MW-7 BTEX compounds were detected at maximum concentrations of 1,600 µg/1 benzene, 170 µg/1 toluene,63 µg/1 ethylbenzene and 220 µg/l xylenes, in MW-7 The fuel additive TAME was detected in the sample from MW-7 at 50µg11, and 1,2-DCA was detected in the samples from MW-4 and MW-7 at 13 µg/1 and 50 µg/1, respectively 3 2 2 First Quarter 2004 Laboratory Results TPH-g was detected in samples from MW-1B and MW-4 at concentrations of 150µg/l and 340µg/1, respectively In addition,TPH-d was detected in MW-4 at a concentration of 64 µg11,the laboratory reported that the TPH-d had significant gasoline range compounds and significant diesel range compounds with no recognizable pattern BTEX compounds were detected in samples from MW-113 and MW-4 at maximum concentrations of 100µg/1 benzene and 2 8 µg/l ethylbenzene in the MW-4 sample and 2 1 µg/l toluene and 11 µg/1 xylenes in the sample from MW-1B The fuel additive MTBE was detected in samples from MW-1B, MW-213 and MW-4 at concentrations of 0 90 µg/l, 14 µg/1 and 3 5 µg/l, respectively No other target analytes were detected in the ground water samples The analytical results are summarized in Tables 2 and 3 Copies of the laboratory reports(CTEL Project No CT214-0312094 and MAI Work Order 0403052), QA/QC reports and chain-of-custody forms are in Appendix B Advanced GeoEnviro n mental Inc