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CLEARWATER <br /> G R O U P, I N C <br /> IAnalysis Laboratory, Inc in Hayward, California The samples were analyzed for <br /> TPHg by EPA 8015 (DHS-modified) and BTEX by EPA 8020 (modified) Data are <br /> presented in Table 3 and Appendix B <br /> I <br />' 5.3 Results of Soil Vapor Extraction System Monitoring <br /> Historical FID, flow and vacuum measurements are summarized in Table 2 Table 3 <br />' summarizes analytical data from tedlar bag vapor samples A copy of the third <br /> quarter laboratory results and the chain-of-custody forms are included in <br /> Appendix B <br /> IThe following is a summary of the SVE system operating parameters monitored on <br /> September 15, 1995 with all five vapor wells online <br /> • Measured flow rates ranged from 10 9 to 57 scfm, total effluent flow was <br /> measured at 146 scfm <br />' • Measured vacuums ranged from 2 5 to 4 9 inches water with all five wells on- <br /> line. <br /> • TPHg was not detected in concentrations exceeding method detection limits in <br /> samples VW-1 and VW-3 TPHg concentrations were 30, 110, 190, and 37 <br /> milligrams per cubic meter (Mg/m3) in samples collected from VW-2, VW-4, <br /> VW-5, and the effluent, respectively. <br />' • Benzene was detected in the vapor samples from VW-4 and the effluent port in <br /> concentrations of 0 51 and 0 1 mg/m3, respectively <br />' Recovered hydrocarbons were calculated using the flow rates measured in the field <br /> and the laboratory analytical results. As of September 15, 1995, an estimated 175 <br />' pounds of hydrocarbons had been removed from the subsurface by the SVE system <br /> I , <br /> I <br /> D-102 3Q95 4 October 23, 1995 <br /> I <br />