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F) <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 22 53 to 26 67 <br /> Direction of Groundwater Flow Northeast <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 /> i <br /> TPHG Conc at End of Period (lab) 11,000 mg/m3 <br /> Benzene Conc End of Period (lab) 50 Mg/M3 <br /> Flow Rate End of Period 34 cubic feet per minute (pre-dilution) <br /> Applied Vacuum This Period 25-68 inches of water <br /> HC Destroyed this Period (lab) _2,702_pounds <br /> Utility Usage <br /> (electrical/gas/propane) 8,514 kilowatt hours <br /> Operating Hours This Period 1,542 <br /> Percent Time Operational 88 percent <br /> Number of Auto Shutdowns i (power failure) <br /> CURRENT SOURCE(BEFORE DILUTION) INFLUENT SUMMARY (LAB) <br /> TPHG Conc This Period 11,000 mg/m3 <br /> TPHG Conc Last Period 27,666 66 mg/m3 (average) <br /> Initial TPHG Conc 55,000 mg/m3(January 24, 1997[following system <br /> startup]) <br /> Benzene Conc This Period 50 mg/m3 <br /> Benzene Conc Last Period 513 33 mg/m3(average) <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 are <br /> consistent with levels detected during previous sampling events The groundwater flow direction and <br /> gradient are consistent with previous sampling events Groundwater elevation decreased approximately <br /> 0 14 foot from the previous sampling event (February 1997) <br /> The remediation system was started up on January 24, 1997 The remediation system consists of a <br /> King, Buck and Associates MMC-5A Catalytic Oxidizer rated at 100 cubic feet per minute The <br />• remediation system is connected to vapor extraction wells VW-4 through VW-13 The system was <br /> operational for 88 percent of the time during the second quarter and extracted a total of 2,702 pounds of <br /> ,SA('-\N\p10\080"8051461 0CS-96\cjb 2 <br />