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w <br /> 01 October 2004 <br /> • AGE-NC Project No 99-0657 <br /> Page 3 of 4 <br /> events Figure 3 illustrates the contoured ground water elevations as measured on 19 April 2004 and <br /> also includes a rose diagram showing ground water directions from previous monitoring events <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from wells MWA, MW-2 and MW-4 through <br /> MW-6 at concentrations ranging from 350 micrograms per liter (µg/1) (MW-5) to 2,800 µg/1 <br /> (MW-6) <br /> BTEX compounds were detected in water samples collected from wells MW-1, MW-2 and MW-4 <br /> at the following maximum concentrations 290 µg/l benzene (MW-4), 22 µg/1 toluene (MW-4), <br /> 12 µg11 ethylbenzene (MW-4) and 610 µg/l xylenes (MW-1) <br /> MTBE was detected in water samples collected from wells MW-1, MW-2, MW-4 and MW-6 at <br /> Iconcentrations ranging from 660 µg/l (MW-2 and MW-4) to 2,700 µg/1 (MW-6) <br /> 1,2-DCA was detected in water samples collected from MW-4 and MW-6 at a maximum <br /> • concentration of 110 µg11 (MW-6) TAME was detected in the water sample collected from MW-2 <br /> at a concentration of 14 µg/1 <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 April 2004 are summarized in Table 2 <br /> I The laboratory report (CTEL Project No CT214-0404140), quality assurance/quality control <br /> (QA/QC)report and chain-of-custody forms are included in Appendix C Documents confirming the <br /> upload of laboratory electronic deliverable format (EDF) files and depth to water measurements to <br /> GeoTracker are included in Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • The ground water elevation averaged approximately 3 58 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-6, 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 on Figures 4, 5 and 6 <br /> IAdvanced GeoEnviron mental,Inc <br />