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31 January 2005 AGE-NC Project No 96-0232 Page 4 of 9 Secondary Aquifer Zone and Primary Aquifer Zone hydrogeologic units as defined in AGE's Final Remediation Plan, and are depicted in Figures 4, 5, 6 and 7, respectively 2 4 1 1 First Zone Aquifer Ground water elevation data collected In the First Zone Aquifer(15 to 35 feet bsg) at the Flag City Chevron inferred a net ground water flow towards the southeast at a hydraulic gradient of 0 001 ft/ft or less The ground water gradient at the Three B's Truck Plaza inferred a net ground water flow direction towards the east at a hydraulic gradient of 0 001 ft/ft or less (Figure 4) 2 4 1 2 Second Zone Aquifer Ground water elevation data collected in the Second Zone Aquifer(40 to 60 feet bsg)Inferred a net ground water flow direction at the Flag City Chevron towards the southeast at a hydraulic gradient of 0 004 ft/ft or less The ground water gradient at the Three B's Truck Plaza inferred a net ground • water flow direction towards the east at a hydraulic gradient of 0 001 ft/ft or less (Figure 5) 2 4 13 Secondga Aquifer Zone Net ground water flow in the Secondary Aquifer Zone (85 to 105 feet bsg) at both the Flag City Chevron and Three B's Truck Plaza was inferred towards the east-southeast at hydraulic gradients of 0 001 ft/ft or less (Figure 6) 2 4 1 4 Primary Aquifer Zone Net ground water flow in the Primary Aquifer Zone (130 to 150 feet bsg) at the Flag City Chevron was inferred towards the east-southeast at hydraulic gradients of 0 001 ft/ft or less The ground water gradient at the Three B's Truck Plaza Inferred net ground water flow towards the east at hydraulic gradients of 0 001 ft/ft or less (Figure 7) 2 4 2 Laboratory Results of Ground Water Samples During the December 2004 sampling event, TPH-g was not detected in any water samples TPH-d was detected in the water sample collected from well MW-12A at a concentration of 260 µg/1, the Advanced GeoEnvironmental,Inc