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'q n <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 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 o <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 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 in wells MW-1 through MW-7 from the previous sampling events Methyl <br /> tertiary butyl ether was below laboratory detection limits for all the wells (USEPA Method 8020) The <br /> groundwater flow direction (northeast) and gradient are consistent with previous sampling events <br /> Groundwater elevation decreased 0 33 foot from the previous sampling event (May 1998) <br /> As documented in Pinnacle's letter, dated April 8, 1998, to the SJCPHS, the influent TPHG and benzene <br /> concentrations continued to decline with system operation and did not rebound back after pulsing the <br /> system for a 3-week period Monitoring data indicate that benzene has declined to non-detectable levels <br /> As a result, Pinnacle suspended vadose zone remediation Pinnacle, on the direction of ARCO, removed <br /> the SVE equipment from the site <br /> CP'1D U_SG\3RDQTRARC012108Q398 DOC 1 <br /> Rev 0,12/7/98 <br />