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14 May 2002 <br /> AGE-NC Project No. 97-0327 <br /> Page 3 of 4 <br /> ' Ground water flow direction at the site was inferred to be toward the southeast at a gradient of 0.001 <br /> ft/ft or less, or approximately 5 feet per mile (Figure 3). <br /> ' 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of three ground water samples were submitted to a DHS-certified laboratory for analysis for <br /> TPH-g, TPH-d, BTEX and fuel oxygenated compounds. TPH-g was not detected in water samples <br /> collected from MW-1, MW-2 or MW-3; however, TPH-d was detected in a water sample collected <br /> from well MW-3 at a concentration of 81 ug/l. <br /> No 13TEX constituents were detected in ground water samples collected from MW-1, MW-2 or <br /> MW-3. <br /> MTBE was detected(EPA Method 8260) in ground water samples collected from wells MW-1 and <br />' MW-2 at concentrations of 0.61 µg11 and 3.3 µgll respectively; 1,2-DCA was detected in samples <br /> collected from wells MW-1 and MW-2 at concentrations as high as 2 4g11. No other fuel components <br /> were detected by laboratory analysis. Analytical results of the ground water samples are summarized <br /> in Tables 3 and 4. The laboratory reports (Castle Analytical Laboratory Reference No. 4300) and <br /> chain-of-custody forms are presented in Appendix B. <br /> 1 <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> The implications of the findings from the December 2001 ground water monitoring event are as <br /> follows: <br /> • Ground water flow direction at the site was inferred to be toward the southeast at a gradient <br /> of 0.001 ft/ft or less. <br />' • Due to the low gradient at the site, slight variations in ground water measurements or <br /> changes of recharge/discharge of the local ground water could greatly modify ground water <br />' flow direction. <br /> • Ground water elevation decreased approximately 1.05 feet between September 2001 and <br /> December 2001; decreasing ground water elevations have been observed at the site since <br /> May 2000. <br /> • Dissolved TPH-d was detected in samples collected from well MW-3; previously, the <br />' greatest TPH-d concentrations have been detected from wells MW-2 and MW-3 while low <br /> concentrations have been detected from well MW-1. <br /> • Low concentrations of dissolved MTBE and 1,2-DCA were detected in samples collected <br />' from wells MW-1 and MW-2 indicating a minor impact to ground water in the area assessed. <br />' Advanced CeoEnvironmental,Inc. <br />