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Table 4 Summary P of Sod Vapor Extraction and Tread .ent System Data,ARCO Station 434,Lodi,California • I Start-up date 613191 Sample Average flow Days m Down days Percent Influent concentration my a Removal rate lbs/day Net removal,lbs&gallons date Period rate cfm period in period operational TPH-G B TPH-G B TPH-G B 1014/94 9127194-1014194 62 7 0 100% 130 <0 007 3 0 21 lbs 0 lbs 1113194 10/4194-1113194 62 30 1 97% 340 <0 083 8 0 228 lbs 0 lbs 1219194 1113194-12127194 62 54 2 96% 110 <0 012 3 0 132 lbs 0 lbs 116195 12127194-1118195 60 22 3 7 83% 76 0035 2 0 31 lbs 0 lbs 216195 1118195-2113195 53 26 161 38% 140 1 1 3 0 28 lbs 0 lbs 317195 2113195-3/16/95 55 31 3 2 90% 89 0 18 2 0 51 lbs 0 lbs 415195 3116195-415195 60 29 0 100% 24 0 1 0 16 lbs 0 lbs 5111195 (b) 415!95-5111195 20 36 22 39% 33 0 0 0 3 lbs 0 lbs 5118195 5111195-5/18195 20 7 0 100% 66 0 0 0 3 lbs 0 lbs 5126195 5118195-5126195 20 8 0 100% 80 0 1 0 5 lbs 0 lbs 6/21/95 5126195-6121195 22 26 0 100% 44 0 0 0 9 lbs 0 lbs 718195 6121195-718195 22 17 0 100% 77 <016 1 0 11 lbs 0 lbs 8122195 718195-8122195 22 45 0 100% 54 <016 0 0 20 lbs 0 lbs 9111195 8/22/95-9111195 22 20 0 100% 68 <016 1 0 11 lbs 0 lbs 12/31/95 9111195-12131195 22 111 97 13%u 0 SYSTEM TURNED OFF ON 9/25/95 0 lbs 0 lbs Totals and averages 9111195-12131195 22 111 97 13% 0 000 0 0 0 lbs 0 lbs for reporting period 0 gals 0 gals Totals and averages 613191-12131195 81 1681 210 88% 1112 5 42 0 50832 lbs 153 lbs cumulative 8199 gals 21 gals Sample calculations Removal rate calculation lbs/day=(grit/mole)*(umole/mole)*(moles/10E+6 umoles)*(10E+3 mglgm)*(] 177 mole/cubic feet)*(2 204640E-6 lb/mg)*(60 min/hr)*(cubic feet/mm)*(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 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 (b)The catlytic oxidizer was taken off-line and replaced with a biofilter system on 5111195 I