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Table 4. Summary of Soil Vapor Extraction and Tre�ment System Data, ARCO Station 434, Lodi, California Start up date 613191 Sample Average flow Days in Down days Percent Influent concentration ppmv(a) Removal rate lb-Jday Net mmoval lbs&gallons date Period rate cfm penod in period operational TPH G B 1 PH G 13 1 PH G is 5118!95 5111195 5118195 20 7 0 10096 66 0 0 0 3 lbs 0 11)" 5126195 S118195 5126195 20 8 0 10090 80 0 1 0 5 tbs 0 IUs 6121195 5126195 6/21195 22 26 0 10096 44 0 0 0 9 lbs 0 Ihs 718!95 6121!95 718/95 22 17 0 10090 77 <016 1 0 II lbs 0 Ibs 8127195 718195 8122195 22 45 0 10090 54 <016 0 0 20 lbs 0 Ibti 9111195 8122!95 9111!95 22 20 0 100% 68 <016 1 0 11 lbs 0 Ibti Totals ruuluverukes 6121!95 9111195 22 82 0 10095 66 <016 1 0 42 lb% 0 Ibti for reporgng periml 7 g'd% 0 g ala TorrdsamluveraS,es 6!3191 911P95 82 1570 113 93% 1131 5 43 0 50832 lbs 153 Ibti cuniulunie 8199 gals 21 gals Sample Calculations Removal rate calculation Ibslday—(gmlmuln)*(umolelmule)*(moles110C+6 umoles)*(10E+3 mglgm)*(l 177 molelcubic feet)*(2 204640E 6 Ib1mg)*(60 minthr)*(cubic feetlmin)*(24 hrslday) where(gnVmole)is molecular weight (umoleslmole)is ppm Influent concenlratlon,molecular weights of TPH G and Benzene are 100 2 and 78 1 respectively For pounds cumulative removal we used the removal lbtday result and multiplied it by the difference to the number of days between the current and previous sampling event Gallons removal calculation(for 7TH) gallons removed—tbs* allonldentiil in lbs(density for TPH G is 6 2 benzene is 7 32) (a)From star)up through June 1992 influentsamples were not taken because there was no sample tap on the inlet to the catalytic oxidizer Therefore the mfiuLril concentrations(in parts per million by volume)are an estimate (b)Ilse cattytic oxidizer was lyaken off line and replaced with a biufiiter system on 5111195 I I