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I 16 September 2004 S AGE-NC Project No 97-0249 IPage 4 of 8 ' Ground water elevation data collected from Flag City Chevron wells MW-9 (A-C),MW-11 (A-D), MW-13 (A-D), MW-16, MW-17, MW-18 and Three B's Truck Plaza wells MW-6, MW-9 (A-E) and MW-10 (A-F) on 14 June 2004 was depicted on cross section C-C'(Figure 3),by determining ' the difference between ground water elevations (dh) and dividing by the difference of the screen interval midpoints (dl), the vertical gradient between adjacent screen intervals was calculated ' Generally,nearly flat,very slight upward and very slight downward vertical gradients were observed between Hydrologic Units 1 through 4, very slight downward vertical gradients were observed between Hydrologic Units 4 and 5, while moderately-steep, downward vertical gradient was generally observed between Hydrologics Units 5 and 6 (Figure 3) Ground water elevations were plotted on scaled site plans for the informal Hydrologic Unit 1 I (between 10 and 35 feet, Figure 4), Hydrologic Unit 2 (between 35 and 60 feet, Figure 5), Hydrologic 3 (between 60 and 90 feet, Figure 6), Hydrologic Unit 4 (between 90 and 110 feet, Figure 7) and Hydrologic Unit 6 (between 135 and 150 feet, Figure S) • 3 1 1 Hydrologic Unit 1 Ground water elevation data collected from Hydrologic Unit 1 (10 to 35 feet bsg) at the Three B's Truck Plaza inferred a net ground water flow towards the east-northeast at an approximate hydraulic gradient of 0 002 ft/ft or less(11 feet per mile),ground water flow direction at the Flag City Chevron site was inferred towards the east-southeast at a hydraulic gradient of 0 001 or less(6 feet per mile) Ground water elevation data collected from Hydrologic Unit 1 is depicted in Figure 4 I3 1 2 Hydrologic Unit_2 Ground water elevation data collected from Hydrologic Unit 2 (35 to 60 feet bsg) at the Three B's I Truck Plaza inferred a net ground water flow towards the northeast at an approximate hydraulic gradient of 0 002 ft/ft or less(1 i feet per mile),ground water flow direction at the Flag City Chevron site was inferred towards the east-southeast at a hydraulic gradient of 0 002 or less Ground water elevation data collected from Hydrologic Unit 2 is depicted in Figure 5 I3 1 3 Hydrologic Unit 3 Ground water elevation data collected from Hydrologic Unit 3 (60 to 90 feet bsg) at the Three B's Truck Plaza inferred a net ground water flow towards the east-northeast at an approximate hydraulic gradient of 0 002 ft/ft or less(11 feet per mile), ground water flow direction at the Flag City Chevron Advanced GeoEnvironmental,Inc