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SVE QUARTERLY OPERATION AND PERFORMANCE: • Equipment Inventory: King, Buck&Associates MMC-5A Catalytic Oxidizer(100-scfm) In ersol Rand OL5 5HP Compressor Operating Mode: Catal is SJVUAPCD Permit No.: N-4124 Total Petroleum Hydrocarbons (TPH) Conc. End of Period (lab): 990 mglm3(940 mglm3 influent to catox) Benzene Conc. End of Period (lab): <0.50 m /m3 0.71 M/M3 influent to catox Flow Rate End of Period: 40 cfm _. Applied Vacuum This Period: 55-60 inches water column HC Destroyed This Period (lab): 173.08 lbs as TPHG Utility Usage (electricallgaslpropane): 9884 kilowatt hours Operating Hours This Period: 1446 Percent Time Operational: 88.6% Number of Auto Shutdowns: 1 ower outage) CURRENT SOURCE (BEFORE DILUTION) INFLUENT SUMMARY (LAB): • Total Petroleum Hydrocarbons as : Gasoline (TPHG)Conc.This Period: 623.33 m Im3 (average) TPHG Conc.Last Period: 880 mg/m3 (average) Initial TPHG Conc.: 9,870 m Im3 November 28,.2000 Benzene Conc.This Period: 1.2 mglm3(average) Benzene Conc. Last Period: <0.50 mg/m3(average) initial Benzene Concentration. fi0:1-m-N/M3(September 28;2000) DISCUSSION: TPHG and BTEX were not detected in the samples collected from monitoring wells MW-2 through MW-5, consistent with the previous quarter. TPHG, benzene, toluene, total xylenes, and MTBE were detected in the sample collected from monitoring well MW-1 at concentrations of 60 gg/L, 4.4 µg/L, 5.5 µg/L, 4.0 µg/L, and 1,100 µg/L, respectively. MTBE was detected in the samples collected from monitoring wells MW-2, MW-5, and MW-6 at concentrations of 1.6 µg/L, 0.98 µg/L, and 0.53 pg/L, respectively. 1,2-DCA was detected in wells MW-2 (1.6 µg/L), MW-5 (0.56 pg/!-), and MW-6 (7.6 Ptg/L). As requested in the San Joaquin County Public Health Services' letter dated September 26, 2001, Delta sampled vapor wells VW-1, VW-2, VW-3, VW-4, VW-5S, and VW-5D. TPHG was detected in well VW-5D at a concentration of 1,400 pg/L. MTBE was detected in vapor wells VW-1, VW-3, and VW-4 at concentrations of 0.68 µg/L, 0.72 µg/L, and 32 lig/L, respectively. TBA was detected in well VW-5D (890 pg/L). 1,2-DCA was detected in wells VW-1 (2.7 µg/L), VW-2 (0.80 µglL),VW-3 (2.5 µg/L), and VW-4 (5.3 W gg/Q. Wells VW-1, V -2, VW-3, VW-4, and VW-5D were not purged prior to sampling because the screened intervals in these wells are not submerged, and the wells were not purged during previous sampling events. Free product was not found in vapor extraction well VW-5D during the first quarter 2002. P AIARC0105481QTRLY120021Arr-o_0546_]Q02.doc Delta