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ARCO PRODUCTS COMPANY SOIL VAPOR EXTRACTION AND TREATMENT (SUETS) AND AIR SPARGING (AS) SYSTEMS OPERATING REPORT Third Quarter 1997 SUMMARY OF OPERATIONAL DATA End of period date 9/16/97 End of last period date 6/30/97 Current well source VW-1,VW-2,VW-3 Current Source(prior to dilution,in ppmv) Influent Summary(laboratory data) TPH cone this period -- TPH cone last period -- Benzene cone this period -- Benzene cone last period -- Current Process(after dilution,in ppmv) Influent Summary(PID data) TPH cone this period 6 9(8/13/97) TPH cone last period 12 2(4/21/97) Benzene cont this period -- Benzene cone last period -- System Para meters/Emmistons Effluent TPH emmisions end of this period(lbs/day) -- Effluent TPH permit requirement VOC's not to exceed 2 0 lbs/day if under 95%DRE 6 5 lbs/day if above 95%DRE %TPH destruction -- Effluent benzene emmisions end of this period(lbs/day) == Effluent benzene permit requirement %benzene destruction VOC's not to exceed 2 0 lbs/day if under 95%DRE 6 5 lbs/day if above 95%DRE Average stack temperature -- Average source flow(SCFM) -- Average process flow(SCFM) -- Average source vacuum(m H2O) -- Assumptions 1 The quantity of hydrocarbons removed was estimated using the influent TPH concentrations at the oxidizer inlet 2 Percent up time was calculated by dividing actual operating hours as determined from hourmeter readings by the total hours of the reporting period 3 Source Flow,Process Flow,and Source Vacuum are based on averages established during a site visits --'=Not available or not applicable Sample Calculations * TPH recovered(in lbs/day)=C x Q x 0 00038 * HC removed=Q x C x 0 00038 x(##hours/24) * LB HC/Utility=LB HC/(therms x 60 cents/therm+ kwh x 12 centslkwh) Where C=Average influent TPH concentration(ppmv) Q=Influent flow rate(SCFM) 0 00038 is a constant and is derived as follows 1 0E-06ppmv x 60mm/hr x 24 hr/day x 1 lb-mol/379 cu-ft x 100 lbs/lb-mol