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Table • Soil Vapor Extraction 0 m Emission Data ARCO Service Station#2093 3425 Tracy Boulevard,Tracy California TPH as Gasoline Benzene Effluent Effluent Hour Meter Blower Average Concen- Emission Destruction Concen- Emission Destruction Is System Sample Date Reading Vecuum Flow Rate tration Rate Efficiency tration Rate Efficiency In Compliance ID Sampled (hours) ('H2O) (scfm) (ppmv) (lbs/day) (percent) (ppmv) (lbs/day) (percent) with AQMD EFFL 12115t95 4 014 11 100 — EFFL 01!04196 4,538 11 95 34 13 98% — Yes EFFL 01/26/96 4 765 50 95 47 18 95% Yes EFFL 02/26/96 4 776 45 75 25 08 96% Yes EFFL 03/27/96 5 231 44 75 25 08 96% — Yes EFFL 04/15/96 5 380 44 74 4 01 99% Yes EFFL 05102/96 5 631 44 76 4 01 99% — Yes EFFL 05115/96 5,819 47 60 13 03 98% Yes EFFL 06/03/96 5,856 45 63 1 0 0 100% Yes EFFL 06/21/96 5 982 34 70 8 02 99% Yes EFFL 07/10196 6 039 30 65 11 03 98% — Yes EFFL 08112196 6 219 16 68 81 2 2 92% — No EFFL 09/16/96 6 265 14 80 15 05 98% Yes EFFL 10/08/96 6 760 25 60 4 01 99% — — Yes EFFL 11/05/96 6 954 35 60 0 00 100% Yes EFFL 12/20/96 7 387 32 63 2 0 0 97% Yes EFFL 01/13/97 7,390 28 60 0 00 100% Yes EFFL 06/18/97 7 566 68 45 1 00 100% Yes EFFL 07/24/97 7,587 48 50 4 01 98% — Yes EFFL 08128!97 7,588 45 60 0 0 0 100% — Yes EFFL 09/10197 7,607 45 55 8 02 96% Yes EFFL 10115!97 7,630 30 60 9 0 2 96% — - Yes EFFL 11/17/97 7 654 30 60 7 0 2 96% — - Yes EFFL 12131/97 7 847 40 65 10 02 95% - - Yes EFFL 05/28/98 7 647 60 40 10 02 100% 005 0 001 997% Yes EFFL 06111198 8,143 50 105 10 04 98% - 0 000 - Yes EFFL 07/08/98 8,444 — - — - - — - Yes EFFL 10/12/98 8,444 50 65 27 01 100% 000 0 000 100% Yes EFFL 11/09198 8,499 50 29 32 00 100% ND 0 000 - Yes EFFL 12/21/98 8 690 40 29 591 0 7 - ND 0 000 - Yes EFFL 02/02/99 8 881 40 27 NO 0 0 100% 002 0 000 96% Yes EFFL 03123/99 10,059 55 40 96 0 2 90% ND 0 000 - Yes EFFL 04115/99 10 609 45 50 5 0 1 98% ND 0 000 - Yes EFFL 5/20199 11,447 55 60 6 01 94% NO 0 000 Yes EFFL 6121199 11,906 50 75 ND 0 0 100% ND 0 000 100% Yes EFFL 7127199 11,979 55 75 3 01 96% ND 0000 100% Yes EFFL 8118199 12,510 60 90 NO 0 0 100% ND 0 000 100% Yes EFFL 9121/99 13 158 60 70 ND 0 0 100% NO 0 000 100% Yes EFFL 1015!99 13,493 60 86 ND 00 100% ND 0 000 100% Yes EFFL 1118199 14,072 60 70 ND 0 0 100% ND 0 000 100% Yes EFFL 12/15/99 14,957 60 72 ND 0 0 100% ND 0 000 100% Yes EFFL 1126100 14,957 62 61 NO 0 0 100% NO 0 000 100% Yes EFFL 2116100 15,460 63 55 NO 00 100% NO 0 000 100% Yes EFFL 3115100 15,461 60 47 ND 00 100% ND 0 000 100% Yes EFFL 4/26100 16 469 50 80 ND 0 0 100% ND 0 000 100% Yes EFFL 5/25100 16,470 60 61 ND 0 0 100% NO 0 000 100% Yes EFFL 6129100 17 022 60 51 NO 0 0 100% ND 0 000 100% Yes scfm =Standard cubic feet per minute NO = of detected ppmv =Parts per million by volume a =Prior to Apnl 1998 data was collected and reported by Brown and Caldwell lbs =Pounds b =TPH-g and benzene concentrations reported as ND are taken as 0 ppmv — =Not applicable or not analyzed for calculation purposes