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�a <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 24 70 to 28 79 <br /> Direction of Groundwater Flow Northeast to East-Southeast <br /> Groundwater Gradient 0 002 to 0 004 <br /> 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) 8,300 mg/m3 <br /> Benzene Conc End of Period(lab) 11 mg/m3 _ <br /> Flow Rate End of Period 30 cubic feet per minute re-dilution <br /> Applied Vacuum This Period 40 Inches of water <br /> HC Destroyed This Period (lab) _ 1,411 pounds <br /> Utility Usage (electrical/gas/propane) 4,843 kilowatt hours <br /> Operating Hours This Period 670 <br /> Percent Time Operational 35 percent <br /> Number of Auto Shutdowns 5 (2 power failures,3 high condensate alarms) <br /> CURRENT SOURCE (BEFORE DILUTION) INFLUENT SUMMARY (LAB): <br /> TPHG Conc This Period 6,766 667 mg/m3 (average) <br /> TPHG Conc Last Period 17,000 Mg/M3 <br /> Initial TPHG Conc 55,000 mg/m3(January 24, 1997 Lf ollowing system startup]) <br /> Benzene Conc This Period 18 mg/m3(average) <br /> Benzene Conc Last Period 34 mg/m3 <br /> Initial Benzene Conc 980 mg/m3(January 24, 1997[following system startup]) <br /> DISCUSSION: <br /> Results of this groundwater monitoring event indicate that levels of dissolved gasoline hydrocarbons <br /> decreased in wells MW-2 and MW-4 through MW-7 and remained generally consistent in wells MW-1 <br /> and MW-3 from the previous sampling events The groundwater flow direction (northeast to east- <br /> southeast) and gradient are consistent with previous sampling events Groundwater elevation decreased <br /> 1 04 feet from the previous sampling event (August 1997) <br /> . Per ARCO's request, oxygenates tertiary butanol, MTBE, dr-isopropyl ether, ethyl tertiary butyl ether, and <br /> tertiary amyl methyl ether were analyzed, using USEPA Method 8260, for the two monitoring wells with <br /> SAC\N',PJM805\0$051461 0ES-98Vzusmcr2 <br />