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27 September 1999 AGE-NC Project No 95-0130 Page 3 of 5 trend of increasing ground water elevations has been observed at the site at least since January 1995 The general ground water gradient at the site was calculated to be approximately 0 005 ft/ft or approximately 26 feet per mile and directed towards the northeast which is consistent with the general gradient and flow direction determined at the adjacent site (Wells Fargo Bank - 49 South Wilson Way) The ground water surface elevation at the site is approximately 13 feet to 23 feet above the slotted screen intervals in wells MW-I through MW-5 and approximately 5 feet to 11 feet above the slotted screen intervals in wells VW-IC, VW-2A and VW-3A Therefore these wells are "drowned", and yield samples representative of deeper ground water 32 LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-5, VW-I C, VW-2A and VW-3A at concentrations ranging from 310 micrograms per liter(/..cg/1)to 270,000 ug/l, respectively Various BTEX compounds were detected in water samples collected from MW-1, MW-2, MW-3, MW-5, VW-IC, VW-2A and VW-3A at concentrations ranging between 5 5 ,ug/l and 50,000 ug/l (benzene and toluene, VW-1C) MTBE was detected to water samples collected from well MW-3, VW-2A, and VW-3A at concentrations as high as 1,600 ug/l MTBE was detected utilizing EPA Method 8260 Modified in water samples collected from wells MW-2, MW-3, VW-IC, VW-2A and VW-3A at concentrations ranging between 2 4 ug/l and 1,200 ug/l TBA was detected In water samples collected from wells MW-5 and VW-2A at concentrations as high as 250 ugll No other fuel oxygenated compounds were detected during the laboratory analysis Analytical results of the ground water samples are summarized in Table 2 The laboratory reports (Castle Analytical Laboratory Reference No 2314 and McCampbell Analytical Inc I D 13440 through 13446) and chain-of-custody forms are presented in Appendix B 4.0. DISCUSSION AND CONCLUSIONS Based upon data collected during the June 1999 monitoring event, AGE concludes • Ground water was inferred to be flowing toward the northeast in the area containing wells MW-1 through MW-5 at a calculated gradient of 0 005 ft/ft, or approximately 26 feet per mile (Figure 3) Due 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 Adianced Ge0Emmonmental,Inc