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F ' 30 April 2005 • AGE-NC Project No 00-0769 ' Page 4 of 7 4 4 f f HU-4 Based on ground water elevation data collected in HU-4 (160 feet to 175 feet bsg), the HU-4 potentiometric surface consists of a northwest-plunging ridge, ground 'water was inferred to be' r flowing outward from the ridge at hydraulic gradients between 0 004 ft/ft and 0 008 ft/ft(Figure 6) 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' During the December 2004 sampling event, 31 ground water samples were collected from HU-1 through HU-5 and submitted for laboratory analysis for the constituents listed in Section 2 2 Analytical laboratory results are summarized in Tables 2 through 5 The lateral extent of petroleum hydrocarbon-impacted ground water for HU-1 through HU-5 is illustrated on Figures 7 through 11, respectively 1 _ HU-1 lie Ground water samples from wells MW-1, MW-2B, MW-313, and "A" wells MW-4A through MW-9A, were collected from HU-1 (25 feet to 51 feet bsg) TPH-g was detected in all 'ground water samples except MW-6A, MW-8A and MW-9A at concentrations ranging from 270,000 micrograms per liter(µg/l) in well MW-1 to 880 µg/1 in well MW-7A (Figure 7) BTEX compounds were detected in all samples except MW-6A, MW-8A and MW-9A at ' concentrations ranging from 26,000µg/l(MW-1)to 27 pg/1(MW-7A)benzene,72,OOOgg/i(MW-1) to 7 6 µg11 (MW-7A) toluene, 3,600 µg/1 (MW-1) to 58 gg/l (MW-7A) ethylbenzene, and 16,000 µg/1 (MW-1)to 58 µg/l (MW-7A) total xylenes , The fuel additive 1,2-DCA was detected in samples from wells MW-1, MW-213, MW-313, and MW-4A through MW-5A at concentrations ranging from 450 gg/l(MW-4A)to 8 1, µg/l(MW-5A) ' DIPE was detected in the samples from wells MW-1,and MW-2B at concentrations of 6 9 µg/1 and 20 µg/1 TAME was detected in ground water samples collected from wells MW-2B and MW-4A at concentrations of 62 µg/l and 50 µg11 1 J 1 - HU-2 Ground water samples from wells MW-2A,MW-3A,and B wells,MW-413 through MW-913,were Advanced GeoEnvironmental,Inc