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ARCO PRODUCTS COMPANY VES OPERATING REPORT,FOURTH QUARTER, 1997,ARCO 2093 SUMMARY OF OPERATIONAL DATA Reporting period 9/30/97-12/31/97 Current well source VES-2, VES-3, VES-4,VES-7,ATR-3,TEX-1 Current source(prior to dilution,to ppmv) Influent summary(PID data) TPH cone this period 115 (11/17/97) TPH cone last period 1050(8/11/97) Initial TPH cone(8/17/95) 1200 Benzene cone this period -- Benzene cone last period -- Initial benzene cone(12115195) 57 Current process(after dilution,to ppmv) influent summary(PID data) TPH cone this period(PID) 115 ppmv(11/17/97) TPH cone last period(PID) 180 ppmv(9/10/97) Initial TPH cone (Lab, 12/15195) 1200 Effluent TPH cone end of this period(PID) 3 0 ppmv(11/17/97) Effluent TPH permit requirement VOC's not to exceed 2 0 lbs/day if under 95%DRE, 5 6 lbs/day VOC if above 95%DRE %TPH destruction 97% Effluent benzene permit requirement VOC's not to exceed 2 0 lbs/day if under 95%DRE, 5 6 lbs/day VOC if above 95%DRE %benzene destruction -- Average source tlow(SCFM) 62 Average process flow(SCFM) 62 Average source vacuum(m H_O) 33 Assumptions I 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 hour meter readings by the total hours of the reporting period 3 Source flow,process flow,and source vacuum are based on averages established during site visits -'=Not available or not applicable Example 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 cents/kwh) Where C=Average influent TPH concentration(ppmv) Q=Influent flow rate(SCFM) 0 00038 is a constant and is derived as follows 10E-06ppmv x 60min/hr x 24 hr/day x 1 lb-mol/380 cu-ft x I00 lbs/lb- •