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31 March 2005 <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-1 I (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 27 December 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 />' Generally, near neutral vertical gradients were observed between the First Zone, Second Zone and <br /> Rocky's Upper Zone, very slight downward vertical gradients were observed between Secondary <br />' 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 /> (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 I (10 to 35 feet bsg)at both the Three <br /> B's Truck Plaza and the Flag City Chevron site's inferred a net ground water flow towards the east- <br /> southeast at an approximate hydraulic gradient of 0 001 ft/ft or less(6 feet per mile), ground water <br /> elevation data collected from Hydrologic Unit I is depicted on Figure 4 <br /> 3 12 Hydrologic Unit 2 <br /> Ground water elevation data collected from Hydrologic Unit 2 (35 to 60 feet bsg) at both the Three <br /> B's Truck Plaza and Flag City Chevron site's inferred a net ground water flow towards the east- <br /> southeast at approximate hydraulic gradients between 0 001 ft/ft and 0 004 ft/ft, ground water <br /> elevation data collected from Hydrologic Unit 2 is depicted on Figure 5 <br />' 3 13 Hydrologic Unit 3 <br />' Ground water elevation data collected from Hydrologic Unit 3 (60 to 90 feet bsg) at both the Three <br /> B's Truck Plaza and the Flag City Chevron site's inferred a net ground water flow towards the east- <br /> southeast at approximate hydraulic gradients between 0 001 ft/ft and 0 002 ft/ft, ground water <br /> elevations from Hydrologic Unit 3 are depicted on Figure 6 <br /> Advanced GeoEnvironmental,Inc <br />