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Jai. <br /> SVE QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory Not applicable (NA) <br /> Operating Mode NA <br /> SJVUAPCD Permit No NA <br /> TPHG Conc at End of Penod (lab) NA <br /> Benzene Conc End of Period (lab) NA <br /> Flow Rate End of Period NA <br /> Applied Vacuum This Penod NA <br /> HC Destroyed This Penod (lab) NA <br /> Utility Usage (electrical/gas/propane) NA <br /> Operating Hours This Penod 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 Penod NA <br /> TPHG Conc Last Penod N/A <br /> Initial TPHG Conc _55,000 mg/m3 (January 24, 1997[following system startup])^� <br /> Benzene Conc This Penod NA <br /> Benzene Conc Last Penod N/A <br /> Initial Benzene Conc 980 mg/m3 (January 24, 1997[followings stem 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, with the following exceptions <br /> Concentrations of TPHG and BTEX decreased in well MW-1, however, MTBE was detected in the well at <br /> a concentration of 269 ppb, using USEPA. Method 8020, and confirmed at a concentration of 23 8 ppb, <br /> using USEPA Method 8260 MTBE was detected in wells MW-2 and MW-5 at concentrations of 1,220 ppb <br /> and 208 ppb, respectively, using USEPA Method 8020 However, MTBE was below the laboratory <br /> detection limit of 2 ppb for wells MW-2 and MW-5 using USEPA Method 8260 The non detect results for <br /> MTBE using USEPA Method 8260 indicates a false positive for the USEPA Method 8020 result, due to the <br /> elevated TPHG concentrations in these two wells MTBE was detected in wells MW-3 and MW-4 at <br /> concentrations of 1,040 ppb and 1,420 ppb, respectively, using USEPA Method 8020, and was confirmed <br /> in wells MW-3 and MW-4 at concentrations of 8 46 ppb and 66 6 ppb, respectively, using USEPA Method <br /> 8260 Di-Isopropyl ether was detected in well MW-6 at a concentration of 8 82 ppb using USEPA Method <br /> 8260 The groundwater flow direction (southeast) and gradient are consistent with previous sampling <br /> events Groundwater elevation Increased 0 77 foot from the previous sampling event (November 1998) <br /> CP lE 1ARC0121681QTRLY\2168Q199 DOC-9811sg 1 j�Cstc[aC�� <br />