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Table A-1 Page 2 of 2 Soil Vapor Extraction System Performance Data i ARCO Service Station#2093 3425 Tracy Boulevard,Tracy,California TPH as Gasoline Benzene FID Influent Influent Hour Meter Blower Average Concen Removal Net Removed Concen- Removal Net Removed Sample Date Reading Vacuum Flow Rate Influent Effluent tration Rate Removed to Date tration Rate Removed to Date ID Sampled (hours) { H2O) (scfm) (ppmv) (ppmv) (ppmv) (lbs/day) (pounds) (pounds) (ppmv) (lbs/day) (pounds) (pounds) INFL 08/18/99 12,510 60 90 10 0 192 07 136 3,391 ND 00 002 93 INFL 09/21/99 13,158 60 70 5 0 303 01 389 3,430 ND 00 000 9 3 INFL 10/05/99 13,492 60 75 15 0 16 05 240 3,454 ND 00 000 93 INFL 11/08/99 14,072 60 70 4 0 ND 00 16 3,456 ND 00 000 93 INFL 12/15/99 14,957 c 60 72 5 0 158 0 5 286 3,484 ND 00 000 9 3 INFL 01/26/00 14,957 c 62 61 5 0 576 01 00 3,484 00 00 000 9 3 INFL 02/16/00 15 460 c 63 55 2 0 158 0 3 51 3,489 NO 00 001 9 3 INFL 03/15/00 15,461 c 60 47 6 0 803 02 00 3,489 01 00 000 93 INFL 04/26/00 16,469 c 50 80 5 0 624 02 74 3,497 ND 00 002 93 INFL 05/25/00 16 470 c 60 61 12 0 103 0 3 00 3,497 004 00 000 9 3 INFL 06/29/00 17,022 c 60 51 1 0 ND 00 29 3,500 ND 00 001 9 3 INFL 07/27/00 17 693 c 52 80 2 0 642 0 2 2 9 3,502 ND 00 000 93 INFL_ 08/28/00 17 693 c 50 90 80 0 160 57 00 3,502 284 01 000 93 INFL 09/29/00 18,462 c 55 71 9 0 126 04 975 3,600 010 00 1 31 106 INFL 10/23/00 18,462 c 45 78 18 0 21 1 07 00 3,600 ND 00 000 106 INFL 11/28/00 19,326 c 50 70 7 0 NO 00 11 8 3,612 ND 00 000 106 INFL 12/18/00 19,326 c 50 88 9 0 458 02 00 3,612 004 00 000 106 REPORTING PERIOD 9129/00 to 12118/00 TOTAL POUNDS REMOVED 36119 106 TOTAL GALLONS REMOVED 592.1 14 PERIOD POUNDS REMOVED 119 000 PERIOD GALLONS REMOVED 19 00 PERIOD AVG FLOW RATE 79 PERIOD PERCENT OPERATIONAL(d) 100% scfm =Standard cubic feet per minute ND=Not detected lbs =Pounds a Prior to April 1998 all data was collected and reproted by Brown and Caldwell - =Not available or not applicable b SVE system left off on 718196 ND =Non-detectable above detection limit c System is being pulsed(one month on,one month off) ppmv =Parts per million by volume d Period percent operational Is calculated for th month the system was scheduled to operate TPH =Total petroleum hydrocarbons Density of benzene=7 34 pounds per gallon FID =Flame ionization detector Density of gasoline=61 pounds per gallon 077 43210 1900&M Tables xls/TABLE 1 2/12/2001