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1 <br />' 16 September 2004 <br /> • AGE-NC Project No 97-0249 <br />' Page 5 of 8 <br />' site was Inferred towards the east-southeast at a hydraulic gradient of 0 001 or less(6 feet per mile) <br /> Ground water elevations from Hydrologic Unit 3 is depicted in Figure 6 <br />' 3 14 Hydrologic Unit 4 <br />' Ground water elevation data collected from Hydrologic Unit 4(90 to 110 feet bsg) at the Three B's <br /> Truck Plaza Inferred a net ground water flow towards the east-northeast at an approximate hydraulic <br /> gradient of 0 001 ft/ft or less(5 feet per mile), ground water flow direction at the Flag City Chevron <br />' site was Inferred towards the east-southeast at a hydraulic gradient of 0 001 or less(6 feet per mile) <br /> Ground water elevations from Hydrologic Unit 4 is depicted in Figure 7 <br /> I3 1 5 Hydrologic Unit 6 <br />' Ground water elevation data collected from Hydrologic Unit 6(130 to 150 feet bsg)at the Three B's <br /> Truck Plaza inferred a net ground water flow towards the east-northeast at an approximate hydraulic <br /> gradient of 0 001 ft/ft or less(5 feet per mile), ground water flow direction at the Flag City Chevron <br />' • <br /> site was inferred towards the east-southeast at a hydraulic gradient of 0 001 or less Ground water <br /> elevations from Hydrologic Unit 6 is depicted in Figure 8 <br /> 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> A total of forty ground water monitoring well samples were submitted to McCampbell Analytical <br /> Inc (MAI),a DHS-certified laboratory,for analysis,one domestic water well sample was submitted <br /> for analysis <br /> TPH-g was detected ml 0 water samples collected from wells MWA,MW-2,MW-3,MW-5,MW-6, <br />' MW-8(A and C)and MW-10(A-C)at concentrations as high as 27,000 micrograms per liter(µg/1) <br /> in the sample collected from MW-3 The estimated extent of dissolved TPH-g in Hydrologic Unit 1 <br /> is depicted in Figure 9 <br />' TPH-d was detected in six water samples collected from wells MW-1, MW-2, MW-3, MW-6 and <br /> MW-8 (A and C) at concentrations as high as 2,500 gg/l in the sample collected from MW-3, <br />' however, the laboratory reported the TPH-d sample chromatograms to either have significant <br /> gasoline range compounds, diesel range compounds, oil range compounds or unmodified <br /> gasoline/diesel The estimated extent of dissolved TPH-d in Hydrologic Unit 1 Is depicted in <br /> Figure 10 <br /> i <br /> Advanced GeoEnvironmental,Inc. <br />