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11 September 2002 <br /> AGE-NC Project No 96-0249 <br /> Page 4 of 6 <br /> I was detected in water samples collected from MW-I and MW-2 at concentrations of 30 µg11 and 15 <br /> µg/1, respectively No other oxygenated fuel additives were detected in the ground water samples <br /> Laboratory analysis of the sample collected from domestic drinking water well DW-1 did not detect <br /> any constituents of concern above laboratory reporting limits <br /> Previous and current analytical results of ground water monitoring well samples are summarized in <br /> Tables 3 and 4, analytical results of the ground water samples collected from the domestic drinking <br /> water well DW-1 are summarized in Table 5 The laboratory reports (MAI Work Order <br /> No 0206243) and chain-of-custody forms are presented in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The Implications from the June 2002 ground water monitoring event are as follows <br /> Ground water elevation data was generally Inferred to be toward an east-west-trendm <br /> • g Y g <br /> depression of the water table extending from the east side of Flag City Chevron through the <br />�i domestic well at the Three B's Truck Plaza(Figure 3) Ground water gradients range from <br /> approximately 0 001 ft/ft around Flag City Chevron to 0 01 ft/ft around Three B's Truck <br />' Plaza <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 the inferred <br /> Iground water flow direction <br /> • Ground water flow direction at the site may have been influenced by pumping of domestic <br /> water well DW-1 <br /> • The ground water elevation at the site was within the screened intervals of wells MW-1 <br />' through MW-6 which should yield samples fully representative of shallow ground water <br /> conditions <br /> • Ground water elevation at the site increased an average 0 71 feet between the March 2002 <br /> and the June 2002 ground water monitoring events (Table 1) <br /> • The lateral extent of the dissolved petroleum hydrocarbon plume is not known toward the <br /> south, southwest, west, northwest and north of the area bound by wells MW-1 through <br /> MW-6, the vertical extent on the site is not known in any direction (Figures 4 and 5) <br /> • The elevated petroleum hydrocarbon concentrations detected in water samples collected from <br /> wells MW-1, MW-2 and MW-3 (screened between 5 and 25 feet bsg) suggest that these <br /> • wells may be screened within or near a "core area" of a dissolved petroleum hydrocarbon <br /> Advanced GeoEnvironmental,Inc <br />