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[4 <br /> • Cumulative FP Recovered to Date N/A <br /> Current Remediation Techniques SVE/Air Sparging <br /> Approximate Depth to Groundwater 47 25 to 49 56 <br /> Groundwater Flow Direction East <br /> Groundwater Gradient 0 001 <br /> SVE QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory Airex Katox Catal is Oxidizer 100-scfm <br /> Operating Mode Catalytic <br /> SJVUAPCD Permit No N-3218-1-0 <br /> Total Petroleum Hydrocarbons (TPH) <br /> Conc End of Period(lab) �200_mg/m3 <br /> Benzene onc End of Period(lab) _ <0 4 mg/m3 <br /> Flow Rate End of Period 43 cubic fest per minute <br /> Applied Vacuum This Period 119 inches of water <br /> HC Destroyed This Period(lab) 531 pounds <br /> Utility Usage (electrical/gas/propane) 12,236 kilowatt hours <br /> Operating Hours This Period 1,032 <br /> Percent Time Operational 470/6 <br /> Number of Auto Shutdowns 0 <br /> CURRENT SOURCE(BEFORE DILUTION) INFLUENT SUMMARY (LAB). <br /> Total Petroleum Hydrocarbons as <br /> Gasoline(TPHG) Conc This Period 3,200 mg/m3 <br /> TPHG Conc Last Period 4,000 mg/m3 <br /> Initial TPHG Conc _9,900 m9/m3(November 9, 1994[following system upgrade]) - <br /> Benzene Conc This Period _ <0 4 m2/m3 _ <br /> Benzene Conc Last Period 1 2 mg/m3 <br /> Initial Benzene Concentration 290 mg/m3 November 9, 1994 followin s stem u rade <br /> DISCUSSION <br /> The results of this monitoring event indicated that the concentration levels of dissolved gasoline <br /> hydrocarbons are generally consistent with previous sampling events The groundwater gradient and <br /> direction of groundwater flow (east) were also generally consistent with previous data Groundwater <br /> elevation decreased approximately 3 5 feet from the previous sampling event (May 1997) <br /> The SVE system is operating effectively to reduce petroleum hydrocarbon impact to soil and <br /> groundwater A total of 531 pounds of TPHG were removed during the third quarter of 1997 A <br /> cumulative amount of 24,800 pounds of TPHG have been removed since commencing SVE activities <br /> SAO N TJ0\0805\08051140 8CS-97Tchell 1 <br />