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Approximate Depth to Groundwater: 25.16 to 27.26 feet hgs <br /> • Direction of Groundwater Flow: East <br /> Groundwater Gradient: 0.0029 ft/ft <br /> SVE QUARTERLY OPERATION AND PERFORMANCE: <br /> Equipment Inventory: King, Buck&Associates MMC-5A <br /> Catalytic Oxidizer(100-scfm) <br /> Ingersol 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): 1,100 m Im3 <br /> Benzene Conc. End of Period(lab): <5 mg/m3 _ <br /> Flow Rate End of Period: 40 cfm <br /> Applied Vacuum This Period: 22-25 inches water column <br /> HC Destroyed This Period(lab): 83.78 lbs as TPHG <br /> Utility Usage(electrical/gas/propane): 3,367 kilowatt hours <br /> Operating Hours This Period: 687 hours <br /> Percent Time Operational: 37.6% <br /> Number of Auto Shutdowns: 2-Due to Blower Failure <br /> CURRENT SOURCE (BEFORE DILUTION) INFLUENT SUMMARY(LAB): <br /> Total Petroleum Hydrocarbons as <br /> Gasoline(TPHG)Conc.This Period: 1,465 m2/m3(average) <br /> TPHG Conc. Last Period: 1,238 mg/m3(average) <br /> Initial TPHG Conc.: 9,870 mg/m3 (November 28, 2000) _ <br /> Benzene Conc.This Period: <3.75 mg/m3(average) <br /> Benzene Conc. Last Period: 1.31 Mg/M3(average) <br /> Initial Benzene Concentration: 60.1 mglm3(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. Benzene, toluene and total xylenes were detected in the sample <br /> collected from monitoring well MW-1 at concentrations of 1.2 µg/l, 1.1 µg11 and 0.73 µg11, respectively. <br /> MTBE was detected in the samples collected from monitoring wells MW-1 and MW-6 at concentrations of <br /> 8.8 µg11 and 7.2 µg/l, respectively. <br /> Delta conducted six site visits during the second quarter 2001 to measure and bail free product in vapor <br /> extraction well VW-5D. Thickness of free product varied from a maximum of 0.12 feet (04102/01) to 0.0 <br /> . feet (4/23101 & 06119101) (see Table 3). A total of approximately 3 gallons of free product was recovered <br /> during the second quarter. <br /> CAARC0105481QTRLY120011Arco-0548 2QO1Report.doc Delta <br /> 08/24/01 <br />