Laserfiche WebLink
30 October 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 9of14 <br /> 3 4 12 Second Zone Aquifer <br /> Ground water elevation data collected in the Second Zone Aquifer(40 to 60 feet bsg) inferred net <br /> ground water flow at the Flag City Chevron towards the east-southeast at hydraulic gradients of <br /> 0 002 ft/ft or less The ground water gradient at the Three B's Truck Plaza inferred net ground water <br /> flow towards the east-northeast at hydraulic gradients of 0 002 f1/ft or less (Figure 5) <br /> 3 4 1 3 Secondary Aquifer Zone <br /> Net ground water flow in the Secondary Aquifer Zone(85 to 105 feet bsg) at the Flag City Chevron <br /> was inferred towards the east at hydraulic gradients of 0 001 ft/ft or less The ground water gradient <br /> at the Three B's Truck Plaza inferred net ground water flow towards the east-northeast at hydraulic <br /> gradients of 0 001 ft/ft or less (Figure 6) <br /> 3 4 14 Primary Aquifer Zone <br /> . Net ground water flow in the Primary Aquifer Zone (130 to 150 feet bsg) at the Flag City Chevron <br /> was inferred towards the east-southeast at hydraulic gradients of 0 001 ft/ft or less The ground water <br /> gradient at the Three B's Truck Plaza inferred net ground water flow towards the east at hydraulic <br /> gradients of 0 001 ft/ft or less (Figure 7) <br /> 3 4 2 Laboratory Results of Ground Water Samples <br /> During the September 2004 sampling event, TPH-g was not detected in any water samples TPH-d <br /> was detected in the water sample collected from well MW-12A at a concentration of 270 gg/l, the <br /> laboratory report noted that the TPH-d sample chromatogram had significant diesel range <br /> compounds <br /> MTBE was detected in fifteen water samples collected from monitoring wells MW-5, MW-6B, <br /> MW-7, MW-8A, MW-9A, MW-11 (A and B), MW-13A and MW-14 through MW-19B at <br /> concentrations as high as 1,300 µg/1 (MW-19A), isoconcentration maps displaying the estimated <br /> extent of dissolved MTBE in First Zone and Second Zone aquifer are depicted in Figures 8, 9 and <br /> 10 <br /> No other constituents of concern were detected above laboratory reporting limits in the water <br /> samples collected during the third quarter 2004 sampling event Analytical results of ground water <br /> . monitoring well samples are summarized in Tables 3 and 4 The laboratory reports (McCampbell <br /> Advanced GeoEnviron mental,Inc <br />