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Vironex Environmental Field_Services - HRC Page 3 of 5 <br /> Real Time PID Logging Data (Note response @ 23-30 feet) <br /> GCAAS IdentiFioa[ion'1 Response <br /> 100E-08 <br /> 500[•07 <br /> 6.00E-07 <br /> • 7.00E-07 <br /> 10600[+O7 <br /> * 500E=07 <br /> Y L00E.07 <br /> 500E-07 <br /> .00E-07 <br /> 100E-07 <br /> Q00C-00 <br /> 0-5 5-10 10-15 15-20 20-25 25.30 <br /> Dep[\letwTal[rq <br /> o Calgene ■Tolmne o PenKam§IHexma. <br /> Incremental HAPSITE@ GC/MS Data (In-Situ identification of <br /> contaminates) <br /> After some initial experimentation to add make-up Nitrogen flow to th, <br /> HAPSITE@ MIP carrier flow, allowing seamless entry of MIP carrier gaE <br /> onto the HAPSITE@ three-phase carbon trap, testing began. <br /> Trichloroethane (TCE) was chosen for the sensitivity testing because ii <br /> is a common chlorinated contaminant encountered in the field. The <br /> Geoprobe@ MIP SOP uses a TCE standard at 1000 ppb prepared in 50 <br /> mL of water to perform low level response testing. This concentration <br /> was sequentially cut in half until the HAPSITE@ GC/MS no longer <br /> responded. It was determined that a 10 ppb TCE standard was well <br /> within the sensitivity range of the HAPSITE@ GC/MS and would be <br /> used for subsequent response testing (see Figure 2). This represents <br /> 100-time increase in sensitivity over the traditional FID/PID/ECD in-lir <br /> detectors. <br /> Figure 2: 100 Times Increase in Sensitivity with HAPSITE@ Integrated MIP System <br /> (Usual MIP challenge is @ 1000 ppb TCE) <br /> -_ . <br /> .Gk+W.=ICMrYS'o� kvm mS-'R,p <br /> y ai <br /> M.� ............ nay e•: <br /> �a•*xw <br /> er <br /> ws� � <br /> The second phase of the laboratory testing was to determine if MTBE <br /> could be detected using the integrated MIP-HAPSITE@. An initial high- <br /> level 1000 ppb standard was prepared in 500 mL of water. It was <br /> determined that MTBE easily passed across the membrane and was <br /> http://www.vironex.com/pages/support—hapsite_mlp.html 1/10/2006 <br />