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3 0 GROUNDWATER EXTRACTION <br /> To attempt to reduce the concentrations of MTBE and 1,2-DCA in groundwater, Ramage <br /> Environmental supervised the extraction of groundwater from MW-5 and MW-7 on three monthly <br /> occasions (April 17, May 22, and June 12, 2004) During each event, groundwater was <br /> extracted for approximately 8 hours, using a vacuum truck capable of generating a vacuum of <br /> between 25 and 29 inches of mercury, and a one-inch diameter, semi-rigged, clear, PVC, <br /> Adownhole stinger Groundwater extraction volumes included 2,350 gallons on April 17, 2004, <br /> 2,520 gallons on May 22, 2004, and 2,440 gallons on June 12, 2004 <br /> Following groundwater extraction and recharge, groundwater samples were collected from both <br /> of the extraction wells The groundwater samples were collected using dedicated disposable <br /> bailers and laboratory-supplied containers The groundwater samples were transported in an <br /> iced cooler with chain-of-custody documentation to Kill Kiff analyzed the groundwater samples <br /> for TPH-as-gasoline, BTEX, MTBE, DIPE, ETBE, TAME, and TBA by EPA Method 82608 The <br /> groundwater extraction results are summarized in Table 3, and the laboratory reports are <br /> included in Appendix A <br /> Immediately following each extraction event, the vacuum truck transported the extracted <br /> groundwater as non-hazardous waste to InStrat, Inc for treatment and disposal at its facility in <br /> Rio Vista, California The wastewater disposal documentation is included as Appendix B <br /> 7 <br />