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F !r <br /> SVE QUARTERLY OPERATION AND PERFORMANCE <br /> !- Equipment Inventory Not applicable NA <br /> Operating Mode NA <br /> SJVUAPCID Permit No NA <br /> TPHG Conc at End of Period (lab) NA <br /> Benzene Conc End of Period (lab) NA <br /> Flow Hate End of Period NA <br /> Applied Vacuum This Period NA <br /> HC Destroyed This Period (lab) NA <br /> Utility Usage (electrical/gas/propane) NA <br /> Operating Hours This Period 0 <br /> Percent Time Operational 0 percent <br /> Number of Auto Shutdowns NA <br /> CURRENT SOURCE (BEFORE DILUTION) INFLUENT SUMMARY(LAB) <br /> TPHG Conc This Period NA <br /> TPHG Conc Last Period N/A <br /> Initial TPHG Conc 55,000 mg/m3 (January 24 1997[following system startup]) <br /> Benzene Conc This Period - NA <br /> Benzene Conc Last Period NIA <br /> Initial Benzene Conc 980 mg/m3 (January 24, 1997[following system startup]) <br /> DISCUSSION <br /> Results of this groundwater monitoring event indicate that levels of dissolved gasoline hydrocarbons <br /> remained generally consistent from the previous sampling events MTBE was detected in well MW-5 using <br /> USEPA Method 8020 However, MTBE was detected in wells MW-1, MW-3, MW-4, and MW-6 at <br /> concentrations of 11 6 ppb, 15 0 ppb, 57 2 ppb, and 4 78 ppb, respectively, using USEPA Method 8260 <br /> The non detect result for MTBE in well MW-5 using USEPA Method 8260, indicates a false positive for the <br /> USEPA Method 8020 result, likely due to the elevated TPHG concentration in the well The groundwater <br /> flow direction (east-southeast) and gradient are consistent with previous sampling events Groundwater <br /> elevation decreased 1 10 foot from the previous sampling event (May 1999) <br /> CP IC1Arcluve\Arco121681Qtrly�2168Q399 DOC-98Usg 1 Puawh <br />