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I lie 11 June 2002 AGE-NC Project No 96-0249 IPage 4 of 6 MW-1,MW-2, MW-4 and MW-6 at concentrations as high as 83 µg11 In addition, the oxygenated fuel additive TBA was detected in water samples collected from MW-1 and MW-2 at concentrations of 36 4g/l and 39µg/1, respectively No other oxygenated fuel additives were detected in the ground water samples Laboratory analysis of the sample collected from domestic drinking water well DW-1 did not detect Iany constituents of concern above laboratory reporting limits Previous and current analytical results of ground water monitoring well samples are summarized in Tables 3 and 4, analytical results of the ground water samples collected from the domestic drinking water well DW-1 are summarized in Table 5 The laboratory reports (MAI Work Order No 0203514) and chain-of-custody forms are presented in Appendix C 4.0. SUMMARY AND CONCLUSIONS The implications from the March 2002 ground water monitoring event are as follows P �' g �• a Ground water elevation data was generally inferred to be toward an east-west-trending depression of the water table extending from the east side of Flag City Chevron through the domestic well at the Three B's Truck Plaza(Figure 3) Ground water gradients range from approximately 0 002 ft/ft around Flag City Chevron to 0 01 ft/ft around Three B's Truck Plaza IDue to the low gradient at the site, slight variations in ground water measurements or changes of recharge/discharge of the local ground water could greatly modify the inferred ground water flow direction • Ground water flow direction at the site may have been influenced by pumping of domestic water well DW-1 • The ground water elevation at the site was within the screened intervals of wells MW-1 through MW-6 which should yield samples fully representative of shallow ground water conditions • Ground water elevation at the site increased an average 4 08 feet between the December 2001 and the March 2002 ground water monitoring events (Table 1) I • The lateral extent of the dissolved petroleum hydrocarbon plume is not known toward the south, southwest and west of the area bound by wells MW-1 through MW-6, the vertical Iextent on the site is not known(Figures 4, 5 and 6) • The elevated petroleum hydrocarbon concentrations detected in water samples collected from ' Advanced GeoEnvironmental,Inc I