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3 <br /> Site Background Information: Yamada Brothers <br /> AGE-NC Project No. 98-0452 <br /> f Page 3 of 3 <br /> TPH-g and MTBE have been detected in groundwater samples collected from MW-4 and MW-5. <br /> Similar detection concentrations ofMTBE and TPH-gin samples from MW-5 indicate a correlation <br /> between TPH-g and MTBE detections. <br /> Since May 2006, well MW-4 continued to be impacted by low concentrations of TPH-g and the <br /> I BTEX compounds benzene, toluene, ethylbenzene and xylenes. During the fourth quarter 2006 <br /> monitoring event, MTBE was detected in the samples collected from wells MW-2 and MW-5 for <br /> the first time since March 2005 at concentrations of 21µg/1 and 20 µg/l, respectively. <br /> I <br /> 4 �I <br /> r <br /> i <br /> e <br /> Advanced GeoEnvironmental,Inc. <br /> f <br />