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_ Y <br /> S <br />' 23 December 2005 <br /> i• AGE-NC Project No 00-0769 <br /> Page 4 of 8 <br />' 3 13 ' Hydrogeologic Unit 3 <br /> Based on ground water elevation data collected in HU-3(140 feet to 160 feet bsg),the ground water <br /> flow direction is generally towards the southwest and southeast at gradients of approximately - <br />' 0 002 ft/ft and 0 004 ft/ft, respectively (Figure 5) <br /> r3 1 4 Hydrogeologic Unit 4 <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 a hydraulic gradient of 0 009 ft/ft (Figure 6) <br /> 1 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' During the September 2005 sampling event, 31 ground water samples were collected from HU-1 <br /> through HU-5 and submitted for laboratory analysis for the constituents listed in Section 2 2 <br /> Analytical laboratory results are summarized in Tables 2 and 3 The lateral extent of petroleum <br /> hydrocarbon-impacted ground water for HU-1 through HU-5 is illustrated on Figures 7 through 11, <br /> respectively , I , <br /> 3 2 1 Hydrogeologic Unit 1 <br /> Ground water samples from wells MW-1, MW-213, MW-313, and "A" wells MW-4A through <br /> MW-9A were cdllected 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 300 micrograms per liter(µg/1)in well MW-7A to 180,000µg/1 in well <br /> MW-1 (Figure 7) r <br />' BTEX compounds were detected in all samples except MW-6A, MW-8A and MW-9A, the <br /> maximum concentrations were detected in sample MW-1, at 30,000 µg/1 benzene, 37,000 µg/1 <br /> toluene, 3,000 µg/1 ethylbenzene, and 16,000'µg/1 total xylenes <br /> r <br /> r <br /> The fuel additive 1,2-DCA was detected in samples from wells MW-1,MW-213,MW-313,MW-4A <br /> and MW-5A at concentrations ranging from 23 µg/1 (MW-3B) to 470 µg/1 (MW-2B) DIPE was <br />' detected in the samples from wells MW-1,MW-2B,and MW-5A at concentrations ranging from 7 6 <br /> • µg/1 (MW-1 and MW-5A) to 17 µg/l (MW-2B) TAME was detected in the ground water sample <br /> F <br /> Advanced GeoEnnronmental,Inc <br />