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MWM MMM =*MM Ta a A-1 Soil Vapor Extraction System Performance Data ARCO Service Station#2093 3425 Tracy Boulevard,Tracy,California TPH as Gasoline Benzene FAD 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 _ INFL 02/08/02 21,560 a -- _ 0 0 0 0 3,617 -- 0 0 000 106 INFL 03/11/02 21,560 a -_ 0 0 00 3,617 -- 00 000 106 INFL 04/12/02 21,560 e - 0 0 0 0 3,617 - 00 000 106 INFL 05/03/02 21,560 a .. .. _ 0 0 00 3,817 -- 0 0 000 106 INFL 07/16/02 21,560 a -- 0 0 00 3,617 -- 00 000 106 INFL 08/27/02 21,560 a .. 00 0 0 3,617 0 0 000 106 INFL 09/24/02 21,560 a .- _ _ 00 00 3,617 0 0 000 106 INFL 10/16/02 21,560 a ._ 0 0 00 3,617 0 0 000 106 INFL 11/26/02 21,560 a 0 0 00 3,617 -- 00 000 106 INFL 12/26/02 2i,560 e - GO 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 e - _. 0 0 00 3,617 00 000 106 INFL 03/20/03 21,560 a 0 0 0 0 3,617 0 0 000 10 fi 0D 00 3,617 -- 00 000 106 REPORTING PERIOD FIRST"QUARTER 2003 TOTAL POUNDS REMOVED- TOTAL GALLONS REMOVED 3,6166 106 PERIOD POUNDS REMOVED 5929 14 PERIOD GALLONS,REMOVED System Off System Off System Off PERIOD AVG FLOW RATE System Off System Off PERIOD PERCENT OPERATIONAL(d) System Off scfm =Standard cubic feet per minute NO Not detected Or =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 N ==Non-detectable above detection limit c System is been ppmv =Parts per million by volume y g pulsed(one month on ,one month off) 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 =inchFlame ionization detector Density of benzene=7 34 pounds per gallon "H2O =orches of water Density of gasoline=61 pounds per gallon K 1WproaessW5 BP ARCOT20931Ouarterly%1 OTA 0312083 08M Tables1Q03 Page 3 of 3