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Table 5. Summary of Soil Vapor Extraction and Treatment System Data, ARCO Station 2133, Stockton, California ' Continuous operation began on 1/11/95 Sample Average flow Days in Down days Percent Influent concentration,ppmv Removal rate,lbs/day Net removal,lbs& gallons date Penod rate,cfm period in period operational TPH-G B TPH-G B TPH-G 11 1/11/95 Source test 100 1 00 100% 590 17 22 1 005 22 lbs 00 lbs 2/9/95 1/11/95-2/9195 80 29 10 97% 480 45 144 Oil 403 lbs 29 lbs 3/28/95 2/9/95-3128/95 80 47 340 28% 160 062 48 001 62 lbs 02 lbs 4/4/95 3/28/95-4/4/95 80 7 00 100% 190 047 57 001 40 lbs 01 lbs 5/3195 4/4/95-5/3195 100 29 10 97% 460 12 172 035 482 lbs 98 lbs 5/15195 513195-5/15/95 100 12 05 96% 340 88 127 026 146 Ibs 30 IN 6/12/95 5/15/95-6/12/95 100 28 30 89% 240 1 8 90 005 225 lbs 1 3 lbs Totals and averages 3/28/95-6112/95 95 76 5 940 308 6 112 017 893 lbs 141 lbs for reporting period 144 gals 19 gals Totals and averages 1/11/95-6/12195 91 153 40 74% 351 43 123 012 1380 lbs 173 lbs cumulative91 gals 24 gals Sample calculations Removal rate calculation !bs/day=(gm/mole)*(umole/mole)*(motes/IOE+6 umoles)*(10E+3 mg/gm)*(1 177 mole/cubic feet)*(2 204640E-6 lb/m * 60 min/hr * cubic feet/min g) ( ) ( ) (24 hrs/day) where(gm/mole)is molecular weight,(umoles/mole)is ppm influent concentration,molecular weights ofTPH-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 gallons removed-lbs*gallon/density to lbs(density for TPH-G is 6 2,benzene is 7 32)