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1 <br /> 24 June 2002 <br /> 4 <br /> AGE-NC Project No 99-0624 <br />' Page 3 of 5 <br /> event is depicted and contoured in Figure 3 <br /> 1 The general ground water gradient in the area of wells MW-1 through MW-4 was calculated to be <br /> approximately 0 002 ft/ft or less, or approximately 11 feet per mile and inferred to be flowing <br />' towards the south-southwest <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of four ground water samples were submitted to a DHS-certified laboratory TPH-g was <br />' detected in water samples collected from wells MW-1, MW-2 and MW-3 at concentrations ranging <br /> as high as 160 micrograms per Iiter (,ug/1) in well MW-2 The laboratory indicated that the sample <br />' chromatograms from MW-1 and MW-3 had significant lighter range gasoline compounds and the <br /> sample chromatogram from MW-2 had significant unmodified or weakly modified gasoline <br />' BTEX constituents were detected in ground water samples collected from wells MW-1, MW-2 and <br /> MW-3 at concentrations ranging as high as 13 ,ug/l (benzene, MW-2) <br />' MTBE was detected(EPA 8260) in ground water samples collected from wells MW-1, MW-2 and <br /> MW-3 at concentrations ranging as high as 2,700 ,ug/1 (MW-2) No other constituents of concern <br /> were detected above laboratory reporting limits in the analyzed samples Previous and current <br />' analytical results of ground water monitoring well samples are summarized in Tables 3 and 4 The <br /> laboratory reports (McCampbell Analytical Inc Lab I D No 86123 through 86126) and chain-of- <br /> custody forms are presented in Appendix B <br /> I <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' The implications from the findings of the December 2001 investigation are <br />' a The average depth to ground water and ground water elevation on 11 December 2001 in <br /> monitoring wells on-site was approximately 53 feet below surface grade and 14 feet below <br />' MSL, respectively <br /> • Ground water flow direction in the area of wells MW-1 through MW- <br /> 4 was inferred to be <br /> towards the south-southeast at an approximate gradient of 0 002 ft/ft Due to the low <br /> hydraulic gradient at the site, slight variations in ground water measurements or changes of <br /> recharge/discharge of the local ground water could greatly modify the inferred ground water <br /> flow direction <br /> rTPH-g was detected in ground water samples from wells MW-1, MW-2 and MW-3, the <br /> IAdvanced GeoEnviron mental,Inc <br />