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0 <br /> • ATC Associates Inc. <br /> TC 1117 Lone Palm V Avenue,Suite B Modesto, Avenue,California 95351 <br /> 209-579-2221 <br /> AS SO c i ATE s i N t: . Fax: 209-579-2225 <br /> Vapor Extraction Analytical Results <br /> On September 6, 2005 startup of the vapor extraction system and vapor sampling was performed. <br /> Vapor analytical data is summarized in Table 1. Copies of field notes are contained in Appendix <br /> A. Copies of laboratory reports are contained in Appendix B. <br /> During the startup of the vapor extraction system, flow rate readings were at 211 cfm and <br /> temperature was registering at 1050° F. <br /> Gas Range Organics (C6-C12 GRO) as used by laboratory standards is the vapor equivalent to <br /> TPHg. TPHg and BTEX compounds were detected in each vapor extraction well, influent and <br /> effluent samples. MTBE, TAME, TBA, DIPE and ETBE were not detected in any vapors <br /> samples taken at time of startup. <br /> Analytical results for the influent sample detected TPHg vapors at a concentration of 21,000 <br /> parts per million by volume (ppmv), representing 2.1% of free product. TPHg results for the <br /> • effluent were measured at 11 ppmv. <br /> Concentrations of benzene in influent and effluent samples were detected at 31 ppmv and 0.094 <br /> ppmv. Toluene was detected at 98 ppmv and 0.22 ppmv for influent and effluent, respectively. <br /> Ethyl benzene was detected in the influent at 12 ppmv, but not detected at or above the laboratory <br /> reporting limit of 0.050 ppmv. Total xylenes were detected in the influent and effluent samples <br /> at 66 ppmv and 0.239 ppmv, respectively. <br /> Laboratory results of the effluent and influent vapor samples indicate a destruction efficiency of <br /> 99.95 percent for TPHg, 99.70 percent for benzene, 99.78 percent for toluene, 99.58 percent for <br /> ethyl benzene and 99.64 percent for total xylenes. The laboratory detection limit of 0.050 ppmv <br /> was used to calculate the destruction efficiency for ethyl benzene. <br /> Concentrations of TPHg and BTEX were detected in VEl, VE2, VE3 and VE4. Analytical <br /> results are summarized in Table 1. <br /> The destruction efficiencies for each analyte detected in the influent and effluent samples are <br /> summarized in Table 2. <br /> • <br /> S:\Envirommtal\25291\reports\startup.doe 4 <br />