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T 2 S Soil Vapor Extractio tem Emission Data ARCO Service Station#2093 3425 Tracy Boulevard,Tracy,Cahfomia TPH as Gasoline Benzene Effluent Effluent Hour Meter Blower Average Concen Emission Destruction Concen Emission Destruction Is System Sample Date Reading Vacuum Flow Rate tration Rate Efficiency tration Rate Efficiency In Compliance ID Sampled (hours) ("H20) (scfm) (ppmv) (lbs/day) (percent) (ppmv) (lbs/day) (percent) with AQMD EFFL 12/15/1999 14,957 60 72 NO 00 100% NF-O 000 100% Yes EFFL 1/26/2000 14,957 62 61 ND 00 100% NO 0 000 100% Yes EFFL 2/16/2000 15,460 63 55 ND 00 100% ND 0 000 100% Yes EFFL 3/15/2000 15,461 60 47 NO 00 100% ND 0 000 100% Yes EFFL 4/26/2000 16,469 50 80 NO 00 100% NO 0 000 100% Yes EFFL 5/25/2000 16,470 60 61 ND 00 100% ND 0 000 100% Yes EFFL 6/29/2000 17,022 60 51 ND 00 100% NO 0 000 100% Yes EFFL 7/27/2000 17,693 52 80 NO 00 100% ND 0 000 100% Yes EFFL 8/28/2000 17,693 50 90 NO 00 100% NO 0 000 100% Yes EFFL 9/29/2000 18,462 55 71 NO 00 100% NO 0 000 100% Yes EFFL 10/23/2000 18,462 45 78 NO 00 100% NO 0 000 100% Yes EFFL 11/28/2000 19,326 50 70 NO 00 100% NO 0 000 100% Yes EFFL 12/18/2000 19,326 50 88 NO 00 100% NO 0 000 100% Yes EFFL 1/16/2001 20,024 48 73 ND 00 100% ND 0 000 100% Yes EFFL 2/13/2001 20,024 50 72 ND 00 100% ND 0 000 100% Yes EFFL c 4/17/2001 20,746 50 71 ND 00 100% ND 0 000 100% Yes EFFL c 5/21/2001 21,560 50 72 ND 00 100% ND 0 000 100% Yes EFFL 6/25/2001 System Shutdown - - - - -- Yes scfm =Standard cubic feet per minute NO =Not detected ppmv =Parts per million by volume a =Prior to April 1998 data was collected and reported by Brown and Caldwell lbs =Pounds b =TPH g and benzene concentrations reported as NO are taken as 0 ppmv for calculation purposes =Not applicable or not analyzed c =system effluent from field FID readings TPH = Total purgeable hydrocarbons AQMD =Air Quality Management District "H2O =Inches of water TABLE A 2 2093 O&M Tables 4Q03 As 2 of 2