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' 15 June 2006 <br /> . AGE-NC Project No 04-1045 <br />' Page 3 of 4 <br /> BTEX concentrations were 5,000 µg/l benzene,23,000 µg11 toluene, 3,700m µg/1 ethylbenzene and <br />' 17,500 µg11 total xylenes <br />' The fuel additives 1,2-DCA and TAME were detected in the ground water sample collected from <br /> well MW-1 at concentrations of 430 gg/1 and 60 µg/l, respectively JrJ 14 <br />' No other analytes were detected at or above laboratory reporting limits in the analyzed ground water <br /> �1 <br /> samples The analytical results of the ground water samples collectgdon��, April 2006 are <br /> 17— <br /> summarized in Table 2 Maps depicting the distribution of TPH-g and.l-N&contamination are <br />' shown on Figure 4 and Figure 5 The laboratory report(CTEL Project No CT214-0604115),QA/QC <br /> reports and chain of custody form are included in Appendix C Documents confirming the upload <br /> 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 /> Based on the data collected from the site,AGE concludes <br /> • • At the time of the April 2006 monitoring event, ground water was inferred to flow towards <br /> the east at a gradient of 0 002 ft/ft,which appears to be a slight aberration from the generally <br />' northeasterly flow in the area Due to the low hydraulic gradient at the site on 19 April 2006, <br /> slight variations in ground water measurements or changes of recharge/discharge of the local <br /> ground water could greatly modify the inferred ground water flow direction <br /> • MW-1 was the only impacted well during this quarterly groundwater monitoring event <br />' • TPH-g was detected at a concentration of 190,000 gg/1 All BTEX compounds were detected <br /> at concentrations of 5,000 gg/1 benzene, 23,000 µg/l toluene, 3,700 µg/l ethylbenzene and <br /> 17,500 µg/1 total xylenes from well MW-1 <br />' • 1,2-DCA and TAME were detected only in the ground water sample from MW-1, at <br /> concentrations of 430 µg11 and 60 µg11, respectively _ <br />' • The concentrations of BTEX compounds and 1,2-DCA detected in well MW-1 exceed <br /> California DHS' Maximum Contaminant Levels for these compounds in drinking water <br />' • Additional assessment is necessary to further define the vertical and lateral extent of soil and <br /> ground water contamination in the former UST area <br /> • <br /> 1 Advanced GeoEnvironmental,Inc <br /> 1 <br />