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15 July 2002 <br />AGE -NC Project No 96-0232 <br />Page 10 of 21 <br />13 feet between the April 2002 and the May 2002 ground water monitoring events, and increased <br />an average 0 76 feet between the May 2002 and the June 2002 monitoring events <br />Ground water elevation data collected from multi-level wells MW -9 (A, B and C), MW -11 (A, B, <br />C and D) and MW -13 (A, B, C and D) on 13 June 2002 was depicted on cross section C -C' <br />(Figure 3), the ground water elevation differences between adjacent screen intervals (vertical <br />gradient) was depicted on cross section C -C' Generally, ground water elevation increased slightly <br />with depth, which is indicative of a slight upward vertical gradient, a substantial increase was <br />measured between MW-13B/MW-13C A slight decrease in ground water elevation was observed <br />between MW-9B/MW-9C and MW-11C/MW-i 1D <br />The April, May and June 2002 ground water elevation data collected from the Flag City Chevron site <br />and the adjacent Three B's Truck Plaza site were plotted for the informal First Zone, Second Zone, <br />Secondary Aquifer Zone and Primary Aquifer Zone hydrogeologic flow units as defined in AGE's <br />Final Remediation Plan, and are depicted in Figures 4 through 15 <br />3 4 1 1 First Zone Aquifer <br />Ground water elevation data collected in the First Zone Aquifer (5 to 35 feet bsg) indicated that <br />ground water flow direction was inferred to be <br />radially inwards towards depressions of the water table located between Flag City Chevron <br />wells MW -1, MW -2 and MW -5 and near Three B's Truck Plaza wells MW -6 and DW -1 <br />during April 2002 (Figure 4), <br />• radially inward towards a depression in the water table located between Flag City Chevron <br />wells MW -1 and MW -5 and towards the southwest in the area of Three B's Truck Plaza <br />wells MW -1, MW -2, MW -3 and MW -6 during May 2002 (Figure 5), and <br />• towards Three B's Truck Plaza well MW -6 during the June 2002 event (Figure 6) <br />Ground water gradients ranged from approximately 0 001 ft/ft around the Flag City Chevron site to <br />0 01 ft/ft around Three B's Truck Plaza well MW -6 and DW -1 <br />3 4 1 2 Second Zone Aquifer <br />Ground water elevation data collected in the Second Zone Aquifer (40 to 60 feet bsg) was inferred <br />to be <br />Is • radially inward towards Flag City Chevron well MW -6B during April 2002 (Figure 7), <br />Advanced GeoEnvironmental, Inc <br />