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, <br /> 5 <br /> 23 April 2001 <br /> AGE-NC Project No 97-0301 <br /> ' Page 4of5 <br /> reports(McCampbell Analytical Inc I D No 64483 through 64489) and chain-of-custody forms are <br /> ' presented in Appendix C <br /> t4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the March 2001 ground water monitoring event are as follows <br /> - Ground water flow direction in the area of wells MW-1 through MW-6 is Inferred as east- <br /> southeast at a gradient of 0 003 ft/ft or less(Figure 3), ground water flow direction in the area <br /> ' of well MW-7 is inferred as north <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 /> A minor trend of increasing ground water elevation has been observed at the site at least <br /> ' since September 2000 <br /> - The ground water elevation at the site was within the screened Intervals of wells MW-6, <br /> MW-7 and slightly above the screened intervals of MW-1,MW-2,MW-3 and MW-4,which <br /> yield samples fully representative of shallow ground water conditions Conversely, the <br /> ground water elevation at well MW-5 is approximately 53 feet above the screen interval <br /> (drowned) and yields a sample representative of deeper ground water conditions <br /> The core of the dissolved petroleum hydrocarbon plume appears to be located in the area <br /> ' wells of MW-1 and MW-7, analysis of ground water samples collected from MW-1 and <br /> MW-7 suggest the core of the plume is impacted by TPH-g, TPH-d, BTEX and 1,2-DCA, <br /> very low concentrations of MTBE, EDB and TBA have been detected at MW-1 Indicating <br /> ' that there is only a minor impact of these components <br /> • Laboratory results of ground water samples collected from MW-4 (screened 30 to 50 feet <br /> ' bsg) and MW-5 (screened 80 to 90 feet bsg) suggest that ground water may have been <br /> impacted by TPH-mo and that the plume extends at least 90 feet bsg, and is at least 60 feet <br /> thick <br /> ' - The vertical extent of dissolved petroleum hydrocarbons is not fully defined at the site, the <br /> lateral extent of the dissolved petroleum hydrocarbon plume is not fully defined toward the <br /> southeast, east and northeast of the current area bound by wells MW-1 through MW-7 <br /> s <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected during March 2001, AGE recommends <br /> i <br /> I ' Advanced GeoEnvironmental,Inc <br />