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• • 6 = Table 4 Summary of Soil Vapor Extraction and Treatment System Data,ARCO Station 434,Lodi,California Start-up date 613191 Sample Average flow Days in Down days Percent Influent concentration pprnv a Removal rate,lbs/day Net removal,lbs& allons date Period rate cfm period in period operational TPH-G B TPH-G B TPH-G B 10/4/94 9127194-10!4/94 62 7 0 100% 130 <0007 3 0 21 lbs 0 lbs 1113194 1014194-11!3194 62 30 1 97% 340 <0 083 8 0 228 lbs 0 lbs 12/9194 1113194-12127194 62 54 2 96% 110 <0 012 3 0 132 lbs 0 lbs 1/6/95 12127194-1118195 60 22 3 7 83% 76 0035 2 0 31 lbs 0 lbs 216!95 1118195-2/13/95 53 26 161 38% 140 11 3 0 28 lbs 0 lbs 317195 2/13195-3116195 55 31 3 2 90% 89 018 2 0 51 lbs 0 lbs 4/5!95 3116195-4119195 60 29 00 100% 24 000 1 0 16 lbs 0 lbs Totals and averages 12127194-4119195 58 162 25 85% 88 <0 083 2 0 257 lbs 0 lbs for reporting period 41 gals 0 gals Totals and averages 613191-4MMS 90 1411 91 94% 1278 6 48 0 7422 lbs 79 lbs cumulative 1197 gals 11 gals Sample calculations Removal rate calculation Ibslday—(gmlmole)*(umolelmole)*(moles110E+6 umoles)*(10E+3 mg/gm)*(1 177 mole/cubic Feet)*(2 204640E-6 Ib/mg)*(60 min/hr)*(cubic feet/min)*(24 hrs/day) where(gm/mole)is molecular weight,(umoleslmole)is ppm influent concentration,molecular weights of TPH-G and Benzene are 100 2 and 78 1,respectively For pounds cumulative removal we used the removal lb/day result and multiplied it by the difference in the number of days between the current and previous sampling event Gallons removal calculation(for TPH) gallons removed—lbs*gallon/density in lbs(density for TPH-G is 6 2 benzene is 7 32 (a)From start-up through June 1992 influent samples were not taken because there was no sample tap on the inlet to the catalytic oxidizer Therefore,the influent concentrations(in parts per million by volume)are an estimate I �