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I20 July 2004 <br /> AGE-NC Project No 99-0657 <br /> IPage 3 of 4 <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from wells MW-1 through MW-6 at <br /> concentrations ranging from 290 micrograms per liter(µg11) (MW-6) to 3,200 µg/1 (MW-1) <br /> BTEX compounds were detected in water samples collected from wells MW-1 through MW-6 at the <br /> following maximum concentrations 270 µg11 benzene (MW-5), 96 µg/1 toluene (MW-5), 22 µg11 <br /> ethylbenzene (MW-4) and 918 µg/1 xylenes (MW-5) <br /> MTBE was detected in water samples collected from wells MW-1 through MW-6 at concentrations <br /> ranging from 65 µg/l (MW-5) to 660 µg/1 (MW-2) <br /> 1,2-DCA was detected in water samples collected from MW-4 and MW-6 at a maximum <br /> concentration of 17 gg/l (MW-4) <br /> No other analytes were detected at or above laboratory reporting limits in the ground water samples <br /> analyzed The analytical results of water samples collected in January 2004 are summarized on <br /> Table 2 The laboratory report (CTEL Lab Project No CT214-0401050), quality assurance/quality <br /> t . control (QA/QC) report and chain-of-custody forms are included in Appendix C Geo Tracker <br /> confirmation sheets are provided in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> IThe following conclusions were drawn from the results of this investigation <br /> • The ground water elevation averaged approximately 5 36 feet above MSL Ground water is <br /> inferred to be flowing toward the southwest with an average ground water gradient of <br /> 0 003 foot/foot , <br /> - The highest concentrations of dissolved hydrocarbons occurred in monitoring wells MWA, <br /> MW-2 and MW-5, which are located at or down-gradient of the UST area Concentration <br /> maps depicting the approximate distribution of dissolved TPH-g, benzene and MTBE are <br /> presented in Figures 4, 5 and 6 <br /> • Concentrations of dissolved TPH-g, BTEX and fuel additives have decreased noticeably in <br /> IMW-1,while concentrations have remained relatively stable 1n wells MW-2 through MW-4 <br /> Concentrations of dissolved TPH-g,BTEX and fuel additives increased in wells MW-5 and <br /> I MW-6 The coincidence of these trends may likely indicate an active migration of the <br /> dissolved phase hydrocarbon plume or the localized desorption of additional hydrocarbons <br /> • at the former UST area <br /> IAdvanced GeoEnviranmental,Inc <br /> I <br />