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21 June 2004 <br /> AGE-NC Project No 97-0249 <br /> Page 4 of 7 <br /> the difference between ground water elevations (dh) and dividing by the difference of the screen <br /> IInterval midpoints (dl), the vertical gradient between adjacent screen intervals was calculated <br /> Generally, nearly flat, very slight upward and downward vertical gradients were observed between <br /> Hydrologic Unit Nos 1 through 4 However,moderately steep upward and downward gradients were <br /> observed between Hydrologic Units I though 3 from wells MW-6/MW-9 <br /> and MW-16/MW-17/MW-l8, and a moderately-steep, downward vertical gradient was generally <br />' observed between Hydrologic Unit Nos S and 6(Figure 3) <br /> Ground water elevations were plotted on scaled site plans for the informal Hydrologic Unit 1 <br />' (between 10 and 35 feet, Figure 4), Hydrologic Unit 2 (between 35 and 60 feet, Figure 5), <br /> Hydrologic 3 (between 60 and 90 feet, Figure 6), Hydrologic Unit 4 (between 90 and 110 feet, <br />' Figure 7) and Hydrologic Unit 6(between 135 and 150 feet, Figure 8) <br />' 3 1 1 Hydrologic Unit 1 <br /> Ground water elevation data collected from Hydrologic Unit 1 (10 to 35 feet bsg) at the Flag City <br />'• Chevron was inferred to have a radially inward flow direction towards a ground water depression <br /> in the area of Flag City Chevron wells MW-1, MW-2 and MW-4 (Figure 4) at ground water <br /> gradients of 0 004 ft/ft or less The ground water gradient at the Three B's Truck Plaza was inferred <br />' to be towards the east-northeast at hydraulic gradients of 0 001 ft/ft or less <br /> 3 12 Hydrolo ic�Unit 2 <br /> Groundwater elevation data collected from Hydrologic Unit 2(35 to 60 feet bsg)inferred net ground <br />' water flow towards the east-northeast at hydraulic gradients of 0 003 ft/ft or less Ground water flow <br /> direction at the Three B's Truck Plaza was inferred have a radially inward flow direction towards <br /> a ground water depression in the area of Three B's Truck Plaza well MW-9A and the domestic water <br />' well (Figure 5) at hydraulic gradients of 0 01 ft/ft or less <br />' 3 13 Hydrologic Unit 3 <br /> Ground water flow from Hydrologic Unit 3(60 to 90 feet bsg)appeared to be between east-northeast <br />' and east-southeast at both the Flag City Chevron and the Three B's Truck Plaza sites, at hydraulic <br /> gradients less than 0 002 ft/ft or less (Figure 6) <br /> 1 Advanced GeoEnviron mental,Inc <br /> I <br />