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' 10 November 2003 AGE-NC Project No 97-0249 Page 4of8 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 15 September 2003 was depicted on cross section GC' (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 downward vertical gradients were observed between the Hydrogeologic Units I through 6 screen intervals of all the above wells (Figure 3) Ground water elevations were lotted on scaled site plans for the informal Hydrogeologic Unit 1 p p ' (between 10 and 35 feet, Figure 4), Hydrogeologic Unit 2 (between 35 and 60 feet, Figure 5), Hydrogeologic 3 (between 60 and 90 feet, Figure 6), Hydrogeologic Unit 4 (between 90 and 110 feet, Figure 7) and Hydrogeologic Unit 6 (between 135 and 150 feet, Figure 8) ' 3 1 1 Hydrogeologic Unit 1 ' Ground water elevation data collected in Hydrogeologic Unit 1 (10 to 35 feet bsg) at the Flag City Chevron was inferred to have a radially inward flow direction towards a ground water depression in the area of Flag City Chevron wells MW-1,MW-2 and MW-4(Figure 4)at ground water gradients of 0 005 ft/ft or less The ground water gradient at the Three B's Truck Plaza was inferred to be towards the east at hydraulic gradients of 0 002 ft/ft or less 3 1 2 Hydrogeologic Unit 2 ' Ground water elevation data collected in Hydrogeologic Unit 2(35 to 60 feet bsg)inferred a radially- inward ground water flow in the area of Flag City Chevron well MW-6B, net flow is southwards at ' ground water gradients of 0 002 ft/ft or less Ground water flow direction at the Three B's Truck Plaza was inferred to be towards the east-southeast at hydraulic gradients of 0 001 ft/ft or less (Figure 5) 1 3 13 Hydrologic Unit 3 ' Groundwater elevation data collected in Hydrogeologic Unit 3(60 to 90 feet bsg)inferred a radially- inward ground water flow in the area of Flag City Chevron well MW-9B, net flow is southeasterly ' at ground water gradients of 0 002 ft/ft or less Ground water flow direction at the Three B's Truck Plaza was inferred to be towards the east at hydraulic gradients of 0 001 ft/ft or less (Figure 6) • ' Advanced GeoEnvi ron mental,ine I