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Job No. 00760 Page: 2 <br /> t <br /> IER <br /> OCE URE <br /> A portable skid containing a vacuum pump, flowmeters, and <br /> vacuum gauges was delivered to the site. A rigid vacuum <br /> line was connected to each existing vacuum extraction well, <br /> r <br /> and a volume of air was pumped from the well. The capture <br /> radius was noted by recording the vacuum in inches of water <br /> as seen in the other wells. This procedure was repeated at <br /> different flow rates and at different wells. The detection <br /> - limit for the vacuum gradient was 0.01 inches of water. <br /> Table 1 indicates the results of the testing. <br /> i <br /> s •� QUAy AgSURMCE AND QUALITY CONTROL <br /> Lid <br /> Teflon sealant was used on all threaded joints to prevent <br /> 4 i <br /> . any vacuum loss during the pumping operation. <br /> Vacuum pump flow rate and pressures were routinely checked <br /> against manufacturer's performance charts to insure maximum <br /> performance from the pump. <br /> A cylinder of activated carbon was connected to the <br /> effluent from the vacuum pump to prevent the emission of <br />