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-Aa <br /> Direction of Groundwater Flow: East <br /> Groundwater Gradient: 0.0037 ft/ft <br /> SVE QUARTERLY OPERATION AND PERFORMANCE: <br /> Equipment Inventory: King, Buck&Associates MMC-5A <br /> Catalytic Oxidizer(100-scfm) <br /> In ersol Rand OL5 5HP Compressor <br /> Operating Mode: Catalytic <br /> SJVUAPCD Permit No.: N-4124 <br /> Total Petroleum Hydrocarbons (TPH) <br /> Conc. End of Period (lab): <2000 Mg/M3(100D Mg/M3 influent to catox) <br /> Benzene Conc. End of Period (lab): <10 mg/m3(<2.5 m21m3 influent to catox)_ <br /> Flow Rate End of Period: 56 cfm <br /> Applied Vacuum This Period: 30-36 inches water column <br /> HC Destroyed This Period (lab): 168.34 lbs as TPHG <br /> Utility Usage(electrical/gas/propane): 4,832 kilowatt hours <br /> Operating Hours This Period: 1,715 hours <br /> Percent Time Operational: 95.5% <br /> Number of Auto Shutdowns: 1 <br /> CURRENT SOURCE (BEFORE DILUTION) INFLUENT SUMMARY(LAB): <br /> Total Petroleum Hydrocarbons as <br /> Gasoline(TPHG) Conc.This Period: 680.33 m,, /m�era2e) <br /> TPHG Conc. Last Period: 1,465 mg/m3(average) <br /> i <br /> Initial TPHG Conc.: 9,870 mg/ma November 28, 2000 <br /> Benzene Conc.This Period: <0.05 mg/m3(average) <br /> Benzene Conc. Last Period: <3.75 mg/m3(avera_gej_ <br /> Initial Benzene Concentration: 60.1 mg/m3(September 28, 2000) <br /> DISCUSSION: <br /> TPHG and BTEX were not detected in the samples collected from monitoring wells MW-2 through MW-6, <br /> consistent with the previous quarter. Total xylenes were detected in the sample collected from monitoring <br /> well MW-1 at concentration of 0.6 µg/L. MTBE was detected in the samples collected from monitoring <br /> wells MW-1 and MW-6 at concentrations of 15 pg/L and 6.8 4g/L, respectively. No free product was found <br /> in vapor extraction well VW-51D during third quarter. <br /> The groundwater flow direction was calculated to be towards the east at an average gradient of <br /> 0,0037 ft/ft. An eastward groundwater flow direction is consistent with previous quarters, The <br /> groundwater elevation has decreased approximately by 2.5 feet across the site since the previous <br /> i sampling event (June 2001). <br /> P:1ARC0105481QTRLY120011Arco_0548 3Q01RepoTtdoc Delta <br />