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Table A-1 Soil Vapor Extraction System Performance Data 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 01/15/02 21,560 e - - 0 0 00 3,617 -- 00 000 106 INFL 02/08/02 21,560 e - 0 0 0 0 3,617 -- 00 000 106 INFL 03/11/02 21,560 e - -- 0 0 0 0 3,617 -- 0 0 000 106 INFL 04/12/02 21,560 a -- -- 0 0 0 0 3,617 0 0 000 106 INFL 05/03/02 21,560 e - -- -- 0 0 0 0 3,617 0 0 000 106 INFL 07/16/02 21,560 e - -- - 0 0 0 0 3,617 -- 0 0 000 106 INFL- 08/27/02 21,560 a -- -- - 0 0 0 0 3,617 -- 0 0 000 106 INFL 09/24/02 21,560 a -- 0 0 0 0 3,617 - 0 0 000 106 INFL 10/16/02 21,560 a -- -- -- - 0 0 0 0 3,617 0 0 000 106 )NFL 11/26/02 21,560 a -- - -- 0 0 0 0 3,617 -- 0 0 000 106 INFL 12/26/02 21,560 a -- - - 0 0 0 0 3,617 -- 0 0 000 106 INFL 01/22/03 21,560 a -- -- 0 0 0 0 3,617 -- 0 0 000 106 INFL 02/24/03 21,560 a -- -- -- 0 0 0 0 3,617 -- 0 0 000 106 INFL 03/20/03 21,560 a -- -- -- 0 0 0 0 3,617 -- 0 0 000 106 INFL 04/15/03 21,560 e - -- 0 0 0 0 3,617 - 0 0 000 106 INFL 05/28/03 21,560 a -- -- - -- 0 0 0 0 3,617 -- 0 0 000 106 INFL 06/24/03 21,560 e - -- -- 0 0 0 0 3,617 0 0 000 106 INFL 07/31/03 21,560 a -- -- - 0 0 0 0 3,617 - 0 0 000 106 INFL 08/26/03 21,560 a -- -- -- 0 0 0 0 3,617 - 0 0 000 106 INFL 09129/03 21,560 a -- -- -- - 0 0 0 0 3,617 0 0 000 106 REPORTING PERIOD FIRST QUARTER 2003 TOTAL:POUNDS REMOVED 3,6166 106 TOTAL GALLONS REMOVED 592.9 14 PERIOD POUNDS REMOVED System Off System Off PERIOD GALLONS REMOVED System Off System Off PERIOD AVG FLOW RATE System Off PERIOD PERCENT OPERATIONAL(d) System Off 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 718198 NO =Non-detectable above detection limit c System is bung pulsed(one month on,one month off) ppmv Parts per million by volume d Period percent operational is calculated for the months the system was scheduled to operate TPH =Total petroleum hydrocarbons a SVE system to remain off AS system will remain on FID =Flame ionization detector Density of benzene=7 34 pounds per gallon `H2O =inches of water Density of gasoline=6 1 pounds per gallon ARCO/2093/0bM/2093 08M Tables3Q03 As Paqe 3 of 3