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19 April 1999 AGE-NC Project No 96-0229 Page 3 of 5 Ground water monitoring data collected in the area of wells MW-1 through MW-10 indicated that ' the ground water flow direction was generally toward the northeast ata Era dient of 0 002 ft/ft, or approximately I I feet per mile (Figure 3) Ground water was approximately 5 to 7 feet above the screened intervals in monitoring wells MW-3 and MW-4, ground water was approximately 24 to 26 feet above the screen intervals at MW-I and MWIO-B Therefore these wells are "drowned", and do not yield samples representative of shallow ground water 32 LABORATORY RESULTS OF GROUND WATER SAMPLES A total of eleven ground water samples were submitted to a DHS-certified laboratory in April 1999 Utilizing EPA Method 8015M, TPH-g was detected in water samples collected from wells MW-1 Ithrough MW-4, MW-6, MW-7, MW-8 and MW-9 at concentrations ranging up to 88,000 micrograms per liter (µg/1) UtilizingEPA Method 8020 BTEX compounds were detected in Lound water samples collected � p g p from wells MW-1 through MW-8 and MW-IOB at concentrations ranging as high as 12,000 4g/l (xylenes, MW-2) The greatest benzene concentration was detected in the sample collected from well MW-1 (screened from 48 to 53 feet bsg) at a concentration of 2,800 ug/1 M CBE was detected in ground water samples collected from wells MW-1, MW-7 and MW-8 at concentrations ranging as high as 350 ptgl1 MTBE was confirmed utilizing EPA Method 8260 from wells MW-1, MW-6, MW-7 and MW-8 at concentrations ranging as high as 310 1--ig/l, TAME was detected in the ground water sample collected from well MW-7 at a concentration of 1 2 Mcg/1, TBA was detected in ground water samples collected fiom wells MW-7 and MW-9 at concentrations ranging as high as 36 ,ug/l No other fuel oxygenated additives were detected above laboratory repoitinng limits from the analyzed samples Analytical results of the ground water samples are summaiized in Table 2 The laboratory reports (Castle Analytical Laboratory Refeience No 2213 and McCampbell Analytical Inc I D No 09602 through 09612) and chain-of-custody forms are presented in Appendix B 40 SUMMARY AND CONCLUSIONS Based on the results of ground water monitoring and sampling activities performed in April 1999, AGE concludes • Ground water monitoringdata collected in the area of wells MW-1 through MW-10 indicated g a giound water flow direction generally toward the northeast at a gradient of 0 002 ft/ft Due ArhnrrculGcol;�t��ronmental,nuc