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, '19 January 2004 'AGE-NC Project No 96-0235 ' Page 4 of 8 r r r The elevation of ground water in each well was calculated by subtracting the depth to ground water ' from the surveyed casing elevations (Table 1) Ground water elevations at the site ranged from 12 82 feet (MW-6A) to 14 50 feet (MW-2) below mean sea level (MSL) ! The average ground water elevation at the site was approximately 13 33 feet below MSL The average ground water elevation in the wells decreased by approximately 0 30 feet since the September 2003 ground water monitoring event Figure 5 and Figure 6 illustrate the ground water potentiometric surface based on the shallow- and deep-screened data sets Near the farmer UST cluster, the shallow-screened data delineate a radial ; ' ground water flow pattern,with a net flow towards the northeast at a gradient of 0 008 ft/ft,the deep- screened data delineated a groundwater flow direction toward the east-northeast at a gradient of, ' ' F "0 001 ft/ft Near the formbi UST No 3 excavation ground water flow direction at the shallov� ' ,screened level was inferred to be towards the east at a gradient of 0 006 ft/ft, ground water flow direction at the deep-screened level was inferred to be toward the south-southwest at a gradient of 0 014 ft/ft 32 ANALYTICAL RESULTS OF WATER SAMPLES September 2003 ' MW-2 MW-9, EW-1 and EW-2 TPH-g was detected in the samples collected from MW-1, , , at concentrations as high as 42,000 micrograms per liter(µg/1) in the sample collected from EW-1 TPH-d was detected in samples collected from MW-2 and EW-1 at concentrations of 30 µg/1 and ' r 16 µg/l, respectively ` BTEX compounds were detected in samples MW-1,MW-2,MW-10,EW'1 and EW-2 at maximum- ` ' concentrations of 5,300'µg/1 benzene (MW-1), 560 µg/1 toluene (MW-2), 2,800 µg/1 ethylbenzene (MW-1) and 6,500 µg/1 xylenes (EW-1) ' MTBE was detected in the water samples collected from MW-9,MW-10,MW-11B,MW-12(A and B), MW-13(A and B),-MW-14 (A and B) and EW-1 at concentrations ranging from 12 µg/1 " (MW-14A) to 370 µ.g/1' (EW-1) Water, samples analyzed from MW-2, MW-14B and EW-2, contained detectable concentrations of 1,2-DCA at 6 8 µg/l, 29 µg/1 and 7 4 µg/1, respectively " TAME was detected in the sample' collected from well EW-1 at a concentration of 40 µg/1 ' Concentrations of DIPE,"ETBE, TBA, methanol, ethanol and'-EDB were not detected above , laboratory reporting limits in any of the water samples collected during the June 2003 monitoring event 1 ; ' * " Advanced GevEnvirvnmental,Inc „ r � r