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• SVE QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory King, Buck&Associates MMC-5A (100-scfm) <br /> Operating Mode Catalytic <br /> SJVUAPCD Permit No N-3664-1-0 <br /> TPHG Conc at End of Period (lab) _ Not applicable (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 N/A <br /> Initial TPHG Conc 55,000 mg/m3 (January 24, 1997[followings stem 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 The groundwater flow direction <br /> (northeast to southeast) and gradient are consistent with previous sampling events Groundwater <br /> elevation Increased 3 93 feet from the previous sampling event (February 1998) <br /> As documented in Pinnacle's letter, dated April 8, 1998, to the SJCPHS, and as shown In Figures 4 and 5, <br /> influent TPHG and benzene concentrations continue to decline with system operation and did not rebound <br /> back after pulsing the system for a 3-week period Monitoring data (see Table) indicate that benzene has <br /> declined to non-detectable levels As a result, Pinnacle suspended vadose zone remediation <br /> SAC1N 1PJO\O8O5\08051461 IBS-98\cbell I I ;Z>0W Ze <br /> Rev 0, 10/22/98 <br />