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i 03 March 1999 AGE-NC Project No 95-0142 Page 5 of 7 M 1 cham-of-custody form are Included in Appendix C A stratigraphic cross section of soils at the site- with itewith analytical results of soil samples is depicted in Figure 3 33 GROUND WATER GRADIENT AND DIRECTION ' Depth to ground water at the site ranged from 26 37 feet to 27 08 feet below the well casing tops Between June and September the average ground water elevation increased an average of 0 28 feet The relative ground water elevation data is depicted in Table 3 The ground water elevation gradient for the ground water surface, from well MW-I to the former UST TK1-90 was calculated to be 0 015 feet/feet or 80 feet/mile Ground water elevation gradient ' for the water surfaces, from the former UST TK1-90 to well MW-5 was calculated to average 0 001 feet/feet or 5 28 feet/mile - During the December 1998 monitoring event, the ground water flow direction and water surface appeared to be easterly toward well,MW-5 The relative elevation of ground water surface at the site is illustrated on Figure 3 ' 3 4 ANALYTICAL C L RESULTS OF GROUND WATER SAMPLES TPH-g was detected in samples collected from wells VW-I through VW-4 at concentrations ranging ' from 560 micro ams per liter /l to 160 000 /l TPH- was detected in the'sam le collected �' P (�.cg ) µg g P from wells MW-3, MW-4, MW-5 and MW-6 at concentrations of 390µg/l, 450 µg/1, 330'µg/l and 75,000 µg11, respectively, t , ' BTEX compounds were detected in all the samples collected from the monitoring wells BTEX compounds were detected in samples from each vapor well at concentrations as high as 43,000;ug/l (toluene, VW-1) Benzene concentrations ranged from 5 3 µg/1 (MW-3) to 29,000 µg/l (VW-1) i BTEX compounds were detected in well MW-6 at concentrations of 7,000µg/1 benzene, 16,000µg/l toluene, 2,000'µg/1 ethylbenzene and 11,000µg/l xylene L, , ' t *The compounds were detected in well MW-4 at concentrations of 1 µg/l benzene, 25 µg11 toluene, 4 7 4g/1 ethyl benzene and 21 µg/1 xylene ti . ' t MTBE and TBA were the only oxygenated compound detected in water samples collected from the site MTBE was detected in the ground water samples collected from wells MW-6, VW-1, VW-2, ' VW-3 and VW-4 at concentrations of 71 µg11, 990µg/l, 3 5µg/l, 120µg/1 and 35 µg/1, respectively ' 4dranced GeoEnvironmental,Inc