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i 16 December 2005 • AGE-NC Project No 97-0249 ' Page 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 27 June 2005 is 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,near neutral to upward vertical gradients were observed between the First Zone, Second Zone, Rocky's Upper Zone and Secondary Aquifer Zone, pronounced downward vertical gradients were observed between Secondary Aquifer Zone and Primary Aquifer Zone (Figure 3) ' Ground water elevations were plotted on scaled site plans for the informal Hydrologic Unit 1 (between 10 and 35 feet, Figure 4), Hydrologic Unit 2 (between 35 and 60 feet, Figure 5), I Hydrologic Unit 4(between 90 and 110 feet,Figure 6)and Hydrologic Unit 6(between 135 and 150 feet, Figure 7) 3 1 1 Hydrogeologic Unit 1 E • Ground water elevation data collected in Hydrogeologic Unit 1 (15 to 35 feet bsg) at the Flag City Chevron inferred a net ground water flow towards the east at a hydraulic gradient of 0 001 ft/ft or less The ground water gradient at the Three B's Truck Plaza inferred a net ground water flow direction towards the east at a hydraulic gradient of 0 001 ft/ft or less,the gradient is essentially flat in the area between Flag City Chevron and Rocky's Restaurant (Figure 4) 3 1 2 Hydrogeologic Unit 2 Ground water elevation data collected in Hydrogeologic Unit 2 (40 to 60 feet bsg) inferred a net ground water flow direction at the Flag City Chevron towards the east-southeast at a hydraulic gradient of 0 001 ft/ft or less The ground water gradient at the Three B's Truck Plaza is essentially flat, with a slightly steeper gradient of 0 001 ft/ft or less along the western edge of the site near the domestic well (Figure 5) I 3 1 3 Hydrogeologic Unit 4 Ground water elevation data collected in Hydrogeologic Unit 4 (90 to 110 feet bsg) inferred a net ground water flow direction at the Flag City Chevron towards the east-southeast at a hydraulic gradient of 0 001 ft/ft or less The ground water gradient along the western edge of the Three B's Truck Plaza inferred a net ground water flow direction towards the east at a hydraulic gradient of Advanced GeoEnvironmental,Inc I