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09 May 2002 AGE-NC Project No 96-0232 Page 10 of 18 4 4 1 Ground Water Elevation and Gradient During the March 2002 monitoring event,depths to ground water in Flag City Chevron wells MW-1 through MW-13D were measured between 9 20 and 12 85 feet below the tops of the well casings, ground water elevations were calculated to be between 0 75 and 1 33 feet below mean sea level Ground water elevation at the site generally increased an average 4 33 feet between the December 2001 and the March 2002 ground water monitoring events The March 2002 ground water elevation data collected from the Flag City Chevron site and the adjacent Three B's Truck Plaza site is depicted in Figures 3, 4, 5 and 6 Ground water elevation data collected in the First Zone Aquifer(5 to 35 feet bsg)inferred an inward ground water flow towards an east-west-trending depression of the water table extending from the east side of Flag City Chevron through the domestic well at the Three B's Truck Plaza (Figure 3) Ground water gradients range from approximately 0 002 ft/ft around Flag City Chevron to 0 01 ft/ft around Three B's Truck Plaza Ground water flow direction in the Second Zone Aquifer(40 to 60 feet bsg) in the area of Flag City Chevron monitoring wells MW-6B, MW-8A, MW-9A, MW-10B, MW-11A, MW-12B and MW-13B was inferred to be bi-directional, from the east and the west towards a south-plunging depression of the water table in the area of MW-12C, at approximate gradients of 0 002 ft/ft (Figure 4) Ground water flow direction in the Secondary Aquifer Zone (85 to 105 feet bsg) in the area of Flag City Chevron monitoring wells MW-8B,MW-9B,MW-10D,MW-11 C,MW-12C and MW-13C was inferred to be radially inward toward a south-plunging depression of the water table in the area of MW-12C at an approximate gradient of 0 001 ft/ft or less (Figure 5) Ground water flow direction in the Primary Aquifer Zone (130 to 150 feet bsg) in the area of Flag City Chevron monitoring wells MW-8C,MW-9C and MW-1 OE was inferred to be toward the south- southwest at an approximate gradient of 0 002 ft/ft or less (Figure 6), ground water flow direction in the area of Flag City Chevron wells MW-11D, MW-12D and MW-13D was inferred to be bi- directional,from the north and the south towards an east-west-trending depression in the area of well MW-11D 4 4 2 Laboratory Results of Ground Water Samples During the March 2002 sampling event, TPH-g was not detected in any of the analyzed water samples, however, TPH-d was detected in samples collected from MW-8A, MW-9A, MW-9B, MW-10A,MW-10D,MW-10E,MW-11A,MW-12A,MW-12B,MW-12C,MW-13A and MW-13B Advanced GeoEnvironmental,Inc