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' 25 March 2005 <br /> AGE-NC Project No 98-0540 <br /> Page 3 of 4 <br />' Xylenes were detected in the sample from MW-1 at a concentration of 85 g.g/1 The fuel additive 1,2- <br /> DCA was detected in the ground water samples from MW-1 and MW-3 at concentrations of 220µg/l <br /> and 290 µg/l,respectively No other target analytes were detected above laboratory reporting limits <br />' from the monitoring event, I 1 <br /> Analytical results of ground water samples are summarized in Table 2 Copies of the laboratory <br />' report(CTEL Project Nos CT214-0409095 and 0409145),quality assurance/quality control(QA/QC) <br /> reports and chain of custody forms are included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' Based upon'data collected from the site, AGE concludes the following <br /> • During the September 2004 monitoring event,the ground water gradient was 0 021 ft/ft with <br />' a flow direction toward the east-northeast The flow direction was consistent with flow <br /> directions from previous monitoring events However, the gradient was much steeper than <br /> the gradients calculated from previous monitoring events <br /> TPH-g and xylenes were detected in the sample collected from MW-1 this quarter TPH-g <br /> was detected in the sample collected from well MW-3 this quarter TPH-g and BTEX <br /> concentrations have not been detected in the samples collected from well MW-2 for three <br /> consecutive quarters <br /> • The fuel additive 1,2-DCA was detected in the ground water samples from MW-1 and MW-3 <br /> at concentrations of 220 pg/1 and 290 pg/l, respectively <br /> f <br /> • The 1,2-DCA concentrations detected in the samples collected from MW-1 and MW-3 <br /> - exceeded the State of California's Maximum Contaminant Level (MCL) of 0 5 µg/1 <br /> • Ground water in the area of wells MW-1 (former UST) and MW-3 (immediately down- <br /> gradient of former UST) is impacted by detectable concentrations of dissolved petroleum <br /> hydrocarbons and 1,2-DCA,the vertical and lateral extent of impacted ground water has not <br /> been fully delineated <br /> 5.0. RECONRYI ENDATIONS ' <br /> Based upon data collected from the site, AGE recommends <br /> • <br /> Continued ground water monitoring The fourth quarter 2004 monitoring event was , <br /> . conducted in December 2004, and <br /> IAdvanced GeoEnvironmental,Inc <br /> t <br />