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' 28 March 2005 <br /> . AGE-NC Project No 98-0511 <br />' Page 3 of 4 <br /> concentrations of 27 pg/1 and 43 µg11, respectively <br /> No other constituents of concern were detected at or above laboratory reporting limits Analytical <br /> results of ground water samples are summarized in Table 2 Copies of the laboratory report(CTEL <br /> Project No CT214-0412194), quality assurance/quality control report, and chain of custody forms <br /> are provided in Appendix C Documents confirming the upload of laboratory electronic deliverable <br />' format (EDF) files and depth to water measurements to GeoTracker are provided in Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site during the December 2004 investigation, AGE concludes <br />' the following <br /> • Ground water elevations in the monitored area averaged 0 27 feet above MSL,indicating an <br />' increase in ground water elevation of approximately 1 84 feet since the previous quarter <br /> Ground water at the site was inferred to flow generally toward the south and southwest under <br /> a hydraulic gradient of approximately 0 003 ft/ft or less <br /> ® TPH-g was detected in the ground water sample collected from monitoring well MW-1 at <br /> a concentration of 6,500µg11 BTEX was detected in well MW-1 at concentrations of <br />' 120 [tg/l benzene, 41 p.g/l toluene, 150 µg/1 ethylbenzene, and 6,100 µg/1 xylenes The <br /> detected concentrations of benzene and xylenes were above the DHS'maximum contaminant <br /> levels (MCL) for these contaminants in drinking water <br />' MTBE was detected in the ground water samples collected from wells MW-3 and MW-5 at <br /> concentrations of 27 p g/l and 43 µg/l,respectively These concentrations are above the MCL <br />' (13 pg/1) for MTBE in drinking water <br /> • Analytes of concern were not detected above laboratory reporting limits in ground water <br />' samples collected from wells MW-2, MW-4, and MW-6 through MW-8 <br /> • Hydrocarbon-impacted soil and ground water are not defined laterally along the up-gradient, <br /> eastern portion of the site <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected from the site, AGE recommends <br /> • Continued quarterly groundwater monitoring,the first quarter 2005 groundwater monitoring <br /> event was performed in March 2005 <br /> Advanced GeoEnhronmental,Inc <br />