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I 1 <br /> p <br /> A <br /> i I ! <br /> I30 November 2005 <br /> . AGE-NC Project No 00-0769 <br /> IPage 4 of 8 , G i, , <br /> T <br /> ! <br />' 3 14 Hydrogeologic'Unit 4 <br /> E <br /> Based on ground water elevation data collected in HU-4 (160 feet to 175 feet bsg), the HU-4 <br />' ' potentiometric surface is characterized by a northwest-plunging ridge, ground water was inferred to ` <br /> be flowing outward from this ridge at hydraulic gradients between 0 008 ft/ft and 0 009 ft/ft <br /> (Figure 6) <br /> a <br /> r <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the May 2005 sampling event, 31 ground water samples were collected from HU-1 through <br /> HU-5 and submitted for laboratory analysis for the constituents listed In Section 2 2 Analytical' ' <br />' laboratory results are summarized in Tables 2 and 3 The lateral extent of petroleum hydrocarbon- <br /> impacted ground water for HU-1 through HU-5 is illustrated on Figures 7 through 11,respectively <br /> 1 <br /> 3 2 1 Hydrogeologic Unit I <br />� . Ground water samples from wells MW-1, MW-2B, MW-3B, and "A" wells MW-4A through <br /> MW-9A, were collected from HU-1 (25 feet to 51 feet bsg) <br /> TPH-g was detected in all ground water samples except MW-6A, MW-8A and MW-9A at <br /> concentrations ranging from 290,000 micrograms per liter(µg/1) in well MW-1 to 500 µg/1 in well <br /> MW-7A (Figure 7) = ' <br /> ' S <br /> BTEX compounds were detected in all samples except MW-6A, MW-8A and MW-9A at <br /> concentrations ranging from 64,000µg/l(MW-1)to 24µg/1(MW-7A)benzene,90,000µg/l(MW-1) <br />' to 3 3 µg/1 (MW-7A) toluene, 4,000 µg11 (MW-1) to 3 5 µg11 (MW-7A) ethylbenzene, and <br /> 111 '9,900 µg/l (MW-1) to 31 7 µg11 (MW-6A) total xylenes <br /> 13 <br /> The fuel additive 1,2-DCA was detected in samples from wells MW-1,MW-2B,MW-3B,MW-4A � <br />' J and MW-51N`at concentrations ranging from 500 µg/l (MW-4A) to 83 µg/l (MW-5A) DIPE was <br />' detected in the samples from wells MW-1,MW-2B,and MW-5A at concentrations ranging from 39 <br /> µg/l (MW-I),to 81 µg%l (MW-2B) TAME was detected in the ground water sample collected from <br /> well MW-1 and MW-4A at concentrations of 70 µg11 and 240 µg11, respectively <br /> 3 2 2 Hydrogeologic Unit 2 `I <br />' Ground water samples from wells MW-2A,MW-3 A,and"B"wells,MW-4B through MW-9B,were , <br /> Advanced GeoEnvironmental,Inc <br /> " I <br /> I � i <br />