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LI (7S <br /> Equipment Inventory Not applicable NA <br />{ Operating Mode NA <br /> SJVUAPCD Permit No NA <br /> TPHG Conc at End of Period (lab) NA <br /> Benzene Conc End of Period (lab) NA <br /> Flow Rate 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 NIA <br /> Initial TPHG Conc 55,000 mg/m3 (January 24, 1997[following system startup]) <br /> Benzene Conc This Period NA <br /> r Benzene Conc Last Period NIA <br /> Initial Benzene Conc 980 mg (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 wells MW-4, <br /> MW-5, MW-6, and MW-7 using USEPA Method 8020 However, MTBE was confirmed to be detected at <br /> a concentration of 64 6 ppb only in well MW-4 and was below the method detection limit of 2 ppb in wells <br /> MW-5, MW-6, and MW-7 using USEPA Method 8260 The non detect result for MTBE in wells MW-5, <br /> MW-6, and MW-7 using USEPA Method 8260, indicates a false positive for the USEPA Method 8020 <br /> results, likely due to the elevated TPHG concentrations in these three wells The groundwater flow <br /> direction (east-southeast) and gradient are consistent with previous sampling events Groundwater <br /> elevation increased 0 64 foot in wells MW-1, MW-2, and MW-4 through MW-7 and decreased 0 16 foot in <br /> well MW-3 from the previous sampling event (February 1999) <br /> CP 1C 1ArchivelArco121681Qtrly\21680299 DOC-9811t 1 7� � <br />