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23 June 2003 10 AGE-NC Protect No 00-0769 ' Page 9of13 - 4 4 4 HU4 ' Based on ground water elevation data collected in HU-4 160 to 175 feet bsg)the ground water flow y gr ( j' direction was inferred to be towards the northwest (Figure 10) The approximate ground water " ' gradient was 0 01 ft/ft E ' 4 5 LABORATORY RESULTS OF GROUND WATER SAMPLES During the November 2002 sampling event, ground water samples from 31 monitoring wells were ' collected from HU-1 through HU-5 and submitted for laboratory analysis for the constituents listed in Section 3 2 2 , HU 1 ' Ground water samples from wells MW-1, MW-2B, MW-3B, and "A" wells MW-4A through MW-9A were collected from HUI (Table 3) TPH-g was detected in all ground water samples except MW-9A at concentrations ranging from 1,300 micrograms per liter(µg/1) in well MW-8A to 200,000 µg/1 in well MW-1 BTEX samples compounds were detected in all les at maximum concentrations of 34,000µg11 benzene, P P 49,000 gg/l toluene, 2,300 gg/1 ethylbenzene and 11,000 µg/1 xylenes, in sample MW-1 The fuel oxygenates MTBE, 1,2-DCA and TBA were detected in HU-1 samples MTBE was detected only in sample MW-8A at a concentration of 0 58 gg/l '1,2-DCA was detected in all samples except MW-7A through MW-9A at concentrations ranging from 42 gg/1 (MW-6A) to J 2,500 µg/1 (MW-,1) TBA was detected in samples MW-2B, MW-4A and MW-9A at a maximum" concentration,of 140 µg/1 (MW-2B) In addition, ethanol was detected in sample MW-4A at a concentration of 1,500 µg/1 z , 1 HU2 ' � a Groundwater samples from wells MW-2A,MW-3A, and"B"wells MW-4B through MW-94 were collected from HU2 TPH-g was detected in all ground water samples except MW-813 and MW-9B at concentrations ' ranging from 68 µg/1 (MW-7B) to 25,000 gg/l (MW-3A) 1 Advanced GeoEnvironmental,Inc f ,