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1 <br /> 1 26 July 2000 <br /> AGE-NC PI oJect No 95-0111 <br />' Page 3 of 4 <br /> MW-4, MW-5 and MW-7 at concent]atrons of 9 6 ggll, 2 7 Vg/l, 1 7 gg/l, and 3 7 µg11, <br />' i espectively No other fuel oxygenated compound was detected above labor atory reporting <br /> limits in the gi ound water samples analyzed <br />' The analytical results fI om the sampling of MW-4 on 18 Api it 2000 al e as follows <br /> • TPH-d was detected at a concentr ation of 1,200 gg/l TPH-g and BTE&X compounds were <br />' not detected above laboratory limits in the gi ound water sample analyzed from MW-4 <br /> • MTBE was detected by EPA Method 8260 Modified at a concentration 4 7 gg/l <br /> IAnalytical results of the gi ound water sample is summai ized in Tables 2 and 3 The laboratory i eports <br /> (MAI Laboratory Sample Nos 35157 to 35164 and 35233), quality assurance and quality control <br />' report and chain-of custody forms are included in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected fi om the site during the current and pi eceding ground watel monitor ing <br /> lie events, AGE concludes <br />' o The northerly gi ound water flow dii ection inferred from data collected dui mg this monitor rng <br /> event is consistent with gi ound water flow dri ections determined during past events at the <br /> site <br /> I + The concenti atrons of TPH-g, TPH-d and BTE&X detected in the ground water samples <br /> remain near the low end of the i ange of concentrations pr eviously detected <br /> • The TPH-d detected in samples from wells MW-4 and MW-5 demonstrates the pi esence of <br /> a persistent plume of dissolved diesel fuel in ground water along the north edge of the site <br /> MTBE was detected in the samples collected from wells at the northern edge of the site <br /> However, all concentr atrons of MTBE were less than 10 ggll <br /> 5 0. RECOMMENDATIONS <br /> iOne-year of monitoi rng data from wells MW-7 and MW-8, and the i esults of mot e than five years <br /> of monitoring ground watei in the other monitoring wells has shown that the ground water flow <br /> du ection has been consistently towai d the north-northeast to northeast The data also demonstrates <br /> ithat the plume of hydi ocarbon-impacted gi ound water maybe stable and not actively migrating AGE <br /> i ecommends determining the suitability of the site for closui e <br /> i <br /> Advanced GeoLnvironmcntal Inc <br /> i <br />