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Table 3. Soil Vapor Extraction and Treatment Sys*fluent Data,ARCO Station 434,Lodi,California Start-up date: 613/91 Sample Average flow Days in Down days Percent Influent concentration,ppmv(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 8/16/94 7/6/94-8/16194 62 41 3 93% 261 1.9 6 0 230 lbs 0 lbs 9/9194 8/16194-9/27/94 63 42 1 98% 230 <0.016 5 0 221 lbs 0 lbs 10/4/94 9/27/94-1014/94 62 7 0 100% 130 <0.007 3 0 21 lbs 0 lbs 11/3194 10/4/94-11/3/94 62 30 1 97% 340 <0.083 8 0 228 lbs 0 lbs 1219/94 11/3/94-12/27/94 62 54 2 96% 110 <0.012 3 0 132 lbs 0 lbs 116195 12/27/94-1118/95 60 22 3.7 83% 76 0.035 2 0 31 lbs 0 lbs 2/6/95 1/18/95-2/13195 53 26 16.1 38% 140 1.1 3 0 28 lbs 0 lbs 3/7/95 2/13/95-3/16/95 55 31 3.2 90% 89 0.18 2 0 51 lbs 0 lbs 4/5/95 3/16/95-4/5/95 60 29 0 100% 24 0 1 0 16 lbs 0 lbs 5/11/95 (b) 4/5/95-5/11195 20 36 22 39% 33 0 0 0 3 lbs 0 lbs 5/18/95 5/11/95-5/18/95 20 7 0 100% 66 0 0 0 3 lbs 0 lbs 5/26/95 5/18/95-5/26/95 20 8 0 100% 80 0 1 0 5 lbs 0 lbs 6/21/95 5/26/95-6/21195 22 26 0 100% 44 0 0 0 9 lbs 0 lbs 7/8/95 6121/95-7/8/95 22 17 0 100% 77 <.016 1 0 ll lbs 0 lbs 8/22/95 7/8/95-8/22/95 22 45 0 100% 54 <.016 0 0 20 lbs 0 lbs 9/11/95 8/22/95-9/11195 22 20 0 100% 68 <.016 1 0 11 lbs 0 lbs 12/31/95 9/11/95-12/31/95 22 IH 97 13% SYSTEM TURNED OFF ON 9125195 0 lbs 0 lbs 1/26/96 12/31/96-3/31/96 26 91 55 40% 87 1 NA f 1 I NA 30 lbs NA lbs SYSTEM OPERATED 119196-2114196 Totals and averages 1/]196-3/31/96 26 91 55 40% 87 NA 1 NA 30 lbs NA lbs for reporting period 5 gals NA gals ........................................................................................... ................................ .................. ..................................................... ......................................................................... ........................ ........................ ......................................................................... Totals and averages 6/31191-3/31/96 80 1772 265 85% 1113 5 41 0 50862 lbs 153 lbs cumulative 8203 gals 21 gals Sample calculations: Removal rate calculation: lbs/day=(gm/mole)*(umole/mole)*(moles/IOE+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(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* allon/densi 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 5/11/95. i