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16 December 2004 <br /> i AGE-NC Protect No 97-0249 <br /> Page 5 of 8 <br /> I3 1 3 Hydrologic Unit 3 <br /> Ground water elevation data collected from Hydrologic Unit 3 (60 to 90 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 0 002 ft/ft or less(11 feet per mile),ground water flow direction at the Flag City Chevron <br /> site was inferred towards the east-northeast at a hydraulic gradient of 0 001 ft/ft or less (6 feet per <br /> Imile) Ground water elevations from Hydrologic Unit 3 are depicted on 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(6 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 ft/ft or less Ground <br /> water elevations from Hydrologic Unit 4 are depicted on Figure 7 <br /> . 3 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(6 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 ft/ft or less Ground <br /> water elevations from Hydrologic Unit 6 are depicted on 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 MAI for analysis, one <br /> domestic water well sample was submitted for analysis <br /> TPH-g was detected in seventeen water samples collected from wells MW-1,MW-2,MW-3,MW-5, <br /> MW-6, MW-7 (A, C and D), MW-8 (A-C) and MW-10 (A-E) at concentrations as high as 19,000 <br /> micrograms per liter(µg/1) in the sample collected from MW-3 The estimated extent of dissolved <br /> TPH-g in Hydrologic Unit 1 is depicted on 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 1,700 µg/1 in the sample collected from MW-3 The <br /> laboratory reported the TPH-d sample chromatograms to either have significant gasoline range <br /> Advanced GeoEnvironmental,Inc <br />