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3 0 GROUNDWATER EXTRACTION <br /> On July 10, 2004, to continue attempts to reduce the concentrations of MTBE and 1,2-DCA in <br /> groundwater, Ramage Environmental supervised the extraction of groundwater from MW-5 and <br /> 1 MW-7 on one final occasion This extraction event was added to provide two monthly extraction <br /> events between the regularly scheduled quarterly groundwater monitoring and sampling at the <br /> site During the extraction event, approximately 2,550 gallons of groundwater was extracted in <br /> approximately 8 hours, using a vacuum truck capable of generating a vacuum of between 25 <br /> and 29 inches of mercury, and a one-inch diameter, semi-rigged, clear, PVC, downhole stinger <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 Kiff Analytical, LLC (Kiff), a state of California <br /> N certified analytical laboratory (#2236) Kiff analyzed the groundwater samples for TPH-as- <br /> gasoline, BTEX, MTBE, DIPS, ETBE, TAME, and TBA by EPA Method 82606 The <br /> groundwater extraction results are summarized in Table 3, and the laboratory reports are <br /> included in Appendix A <br /> Immediately following the 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 /> r <br /> M <br /> r <br /> • 7 <br />