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' 16 December 2004 <br /> • AGE-NC Project No 97-0249 <br />' Page 4 of 8 <br />' Ground water elevation data collected from Flag City Chevron wells MW-9 (A-C),MW-11 (A-D), <br /> MW-13 (A-D), MW-16, MW-17, MW-18 and Three B's Truck Plaza wells MW-6, MW-9 (A-E) <br /> and MW-10 (A-F) on 13 September 2004 is depicted on cross section C-C' (Figure 3), by <br />' determining the difference between ground water elevations (dh) and dividing by the difference of <br /> the screen interval midpoints (dl), the vertical gradient between adjacent screen intervals was <br /> calculated <br /> IGenerally,nearly flat, very slight upward and downward vertical gradients were observed between <br /> the First and Second Zones, Rocky's Upper Zone, Secondary Zone and Primary Zone However, <br />' moderately steep downward gradients were observed from well MW-10 between the First Zone and <br /> the Second Zone and from well MW-11 between the Secondary Aquifer Zone and Primary Aquifer <br /> Zone (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 /> IHydrologic 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 Three B's <br /> Truck Plaza inferred a net ground water flow towards the east-southeast 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 generally inferred towards the east at a hydraulic gradient of 0 001 ft/ft or less Ground water <br /> elevation data collected from Hydrologic Unit 1 is depicted on Figure 4 <br /> I <br /> 3 12 Hydrologic Unit 2 <br /> Ground water elevation data collected from Hydrologic Unit 2 (35 to 60 feet bsg) at the Three B's <br /> Truck Plaza inferred a net ground water flow towards the 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-southeast at a hydraulic gradient of 0 002 ft/ft or less Ground <br /> water elevation data collected from Hydrologic Unit 2 is depicted on Figure 5 <br /> Advanced GeoE nviron mental,Inc <br /> I <br />