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Table 4 Summary of Soil Vapor Extraction and Treatment System Data,ARCO Station 434,Lodi,California Start-up date 6/3191 Sample Average flow Days in Down days Percent Influent concentration ppmv a Removal te,lbs/day. Net removal lbs&gallons date Period rate cfm period in penod operational TPH-G B TPH-G B TPH-G 13 1014/94 9127/94-10/4194 62 7 0 100% 130 <0007 3 0 21 lbs 0 lbs 11/3/94 10/4/9411/3/94 62 30 1 97% 340 <0083 8 0 228 lbs 0 lbs 1219194 1113/9412/27/94 62 54 2 96% 110 <0012 3 0 132 lbs 0 lbs 116195 12127/94-1/18195 60 22 3 7 83% 76 0035 2 0 31 lbs 0 lbs 2/6/95 1118/95-2/13/95 53 26 161 38% 140 11 3 0 28 lbs 0 lbs 317195 2113/95-3116195 55 31 3 2 90% 89 0 18 2 0 51 lbs 0 lbs 415/95 3/16/95-4/5195 60 29 0 100% 24 0 1 0 16 lbs 0 lbs 5111195 (b) 415/95-5/11195 20 36 22 39% 33 0 0 0 3 lbs 0 lbs 5118195 5/11195-5/18/95 20 7 0 100% 66 0 0 0 3 lbs 0 lbs 5126/95 5/18/95-5126195 20 8 0 100% 80 0 1 0 5 lbs 0 lbs 6/21/95 5126/95-6121/95 22 26 0 100% 44 0 0 0 9 lbs 0 lbs Totals and averages 4/5/95-6121195 28 106 22 79% 49 000 0 0 37 lbs 0 lbs for reporting period 6 gals 0 gals Totals and averages 613191-6/21/95 85 1488 113 92% 1189 5 45 0 50790 lbs 153 lbs cumulative 8192 gals 21 gals Sample calculations Removal rate calculation lbs/day=(gm/mole)*(umole/mole)*(moles110E+6 umoles)*(IOE+3 mg/gm)*(1 177 mole/cubic feet)*(2 204640E-6 lb/mg)*(60 min/hr)*(cubic feet/min)*(24 hrs/day) where(gm/mole)is molecular weight,(umoles/mole)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 Ib/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* allon/densit 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 (b)The catlytic oxidizer was tyaken off-line and replaced with a btofilter system on 5111/95