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1 �- <br />' L 17 January 2006 <br /> AGE-NC Project No 97-0249 <br /> Page 4of8 <br /> interpretational differences in location of hydrostratigraphic boundanes,Three B's Hydrologic Units <br />' 3 and 5 are laterally equivalent to Flag City's Rock Upper Zone and Secondary Aquifer Zone, <br /> respectively <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 /> f and MW-10 (A-F) on 26 September 2005 is depicted on cross section C-C' (Figure 3), by <br />' I 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 /> Generally,near neutral to upward vertical gradients were observed between the First Zone, Second <br /> Zone,Rocky's Upper Zone and Secondary Aquifer Zone, pronounced downward vertical gradients <br /> were observed between Secondary Aquifer Zone and Primary Aquifer Zone (Figure 3) <br />' ( Ground water elevations were plotted on scaled site plans for the informal Hydrologic Unit 1 <br /> l (between 10 and 35 feet, Figure 4), Hydrologic Unit 2 (between 35 and 60 feet, Figure 5), <br /> Hydrologic Unit 4(between 90 and 110 feet,Figure 6)and Hydrologic Unit 6(between 135 and 150 <br />' feet, Figure 7) <br />' 3 1 1 Hydrogeologic Unit 1 <br /> Ground water elevation data collected in Hydrogeologic Unit 1 (15 to 35 feet bsg) at the Flag City <br />' Chevron inferred a net ground water flow towards the east at a hydraulic gradient of 0 001 ft/ft or <br /> less The ground water gradient at the Three B's Truck Plaza also inferred a net ground water flow <br /> direction towards the east at a hydraulic gradient of 0 001 ft/ft or less,the gradient is essentially flat <br /> in the area between Flag City Chevron and Rocky's Restaurant(Figure 4) <br /> 3 1 2 Hydrogeologic Unit 2 <br /> Ground water elevation data collected in Hydrogeologic Unit 2 (40 to 60 feet bsg) inferred a net <br /> ground water flow direction at the Flag City Chevron towards the east-southeast at a hydraulic <br /> gradient of 0 003 ft/ft or less The ground water gradient at the Three B's Truck Plaza inferred a net <br />' ground water flow direction towards the east-northeast at a hydraulic gradient of 0 001 ft/ft or less, <br /> the gradient is essentially flat at the Three B's Truck Plaza (Figure 5) <br /> 1 <br /> � C <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />