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1 <br /> 10 November 2003 <br /> i AGE-NC Project No 97-0249 <br />' Page 5 of 8 <br /> 3 14 Hydrologic Unit 4 <br />' Ground water elevation data collected in Hydrogeologic Unit 4 (90 to 110 feet bsg) inferred a <br /> radially-inward ground water flow in the area of Flag City Chevron well MW-9B, net flow is <br />' towards the south at ground water gradients of 0 003 ft/ft or less Ground water flow direction at the <br /> Three B's Truck Plaza was Inferred to be towards the east at hydraulic gradients of 0 001 ft/ft or less <br /> (Figure 7) <br /> 1 <br />' 3 1 5 Hydrologic Unit 6 <br /> Ground water flow in Hydrogeologic Unit 4 (130 to 150 feet bsg) appeared to be towards the east- <br /> southeast at both the Flag City Chevron and Three B's Truck Plaza sites, at hydraulic gradients of <br /> 0 001 ft/ft or less (Figure 8) <br /> 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br />' • A total of forty-one ground water samples were submitted to McCampbell Analytical Inc , a DHS- <br /> certified laboratory, for analysis <br />' TPH-gwas detected ml.4 water samples collected from wells MW-1,MW-2,MW-3,MW-5,MW-6, <br /> MW-7D, MW-8 (A, C and F), MW-10 (A, B, C and F) and MW-11A at concentrations as high as <br /> 9,800 micrograms per liter (µg/1) in the sample collected from MW-2 The estimated extent of <br />' dissolved TPH-g in Hydrogeologic Unit 1 is depicted in Figure 9 <br /> TPH-d was detected in nine water samples collected from wells MW-1, MW-2, MW-3, MW-6, <br />' MW-8 (A and C), MW-9 (A and B) and MW-11A at concentrations as high as 860 µg/1 in the <br /> sample collected from MW-8A The estimated extent of dissolved TPH-d in Hydrogeologic Unit I <br /> is depicted in Figure 10 <br />' Various BTEX constituents were detected in 27 water samples collected from wells MW-1,MW-2, <br /> MW-3, MW-5, MW-6, MW-7 (A-E), MW-8 (A-F), MW-9 (A-D), MW-10 (A-F) and MW-I IA at <br />' concentrations as high as 2,800 gg/l The greatest benzene-impact was detected in the ground water <br /> sample collected from well MW-6 at a concentration of 2,800 µg/1 <br />' MTBE was detected.by EPA Method 8260 in 12 ground water samples collected from wells MW-1, <br /> MW-2, MW-4, MW-6, MW-8A, MW-9A, MW-10 (A-C) and MW-11 (A-C) at concentrations as <br /> high as 110 µg/1 (MW-8A) The estimated extent of dissolved MTBE in Hydrologic Units 1 and 2 <br />' are depicted in Figures 1 I and 12, respectively <br /> Advanced GeoEnvironmental,Inc <br /> I <br />