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10 August 2001 <br /> AGE-NC Project No 97-0301 <br /> ' Page 4of5 <br /> summarized in Tables 2 and 3 The laboratory reports (McCampbell Analytical Inc I D No 71331 <br /> ' through 71337) and chain-of-custody forms are presented in Appendix C <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the June 2001 ground water monitoring event are as follows <br /> ' Ground water flow direction for the area bound by wells MW-1, MW-3, MW-4 and MW-6 <br /> was inferred southeast at a gradient of 0 002 ft/ft or less (Figure 3), ground water flow <br /> ' direction for the area bound by wells MW-1,MW-2 and MW-6 was inferred northeast at a <br /> gradient of 0 001 or less, ground water flow direction in the area of well MW-7 was inferred <br /> to be toward the northwest at an undetermined gradient <br /> ' Ground water flow direction in the area bound by Cal Tank-Line wells MW-2, MW-3 and <br /> MW-4 was inferred to be towards the southeast at a gradient of 0 004 ft/ft or less (Figure 3), <br /> ' ground water flow direction in the area of Cal-Tank Line well MW-1 was inferred to be <br /> toward the northeast at an undetermined gradient <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 /> ' The ground water elevation at the site was within the screened intervals of wells MW-1 <br /> through MW-4 and MW-6,which yield samples fully representative of shallow ground water <br /> conditions Conversely, the ground water elevation at well MW-5 is approximately 51 feet <br /> ' above the screen interval (drowned) and yields a sample representative of deeper ground <br /> 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 /> ' 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 /> ' <br /> S.D. RECOMMENDATIONS <br /> ' Based upon data collected during June 2001, AGE recommends <br /> Advanced GeoEnvlronmental,Inc <br /> 1 <br />