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I Table* S Soil Vapor Extraction System Performance Data ARCO Service Station#2133 2908 Benjamin Holt Drive,Stockton,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 01/25/00 -- a -- -- 4,815 60 4 INFL 02/15/00 - -- -- 4,815 60 4 INFL 03/14/00 -- b 30 132 5 0 3 92 02 00 4,815 008 3 4E-03 00 604 INFL 04/03/00 0 c 40 197 4 0 NO 00 1 0 4,816 003 1 9E-03 003 604 INFL 04/26/00 552 26 188 2 0 NO 10 4 8 4,821 002 1 3E-03 002 604 INFL 05/25/00 704 40 167 4 0 ND 0 0 95 4,825 004 1 8E-03 005 60 5 INFL 06/29/00 1,544 41 187 9 0 4 33 03 57 4,831 ND 00 003 605 INFL 07/27/00 2,053 47 246 22 0 3070 30 354 4,867 048 3 7E-02 039 60 9 INFL 08/31/00 2,529 70 170 6 0 NO 00 299 4,897 003 1 3E-03 038 61 3 INFL 09/27/00 3,177 41 195 7 0 ND 00 00 4,897 NO 00 002 61 3 REPORTING PERIOD 6129100 TO 9127100 TOTAL POUNDS REMOVED 4,901 3 613 TOTAL GALLONS REMOVED 8035 8 4 PERIOD POUNDS REMOVED 654 08 PERIOD GALLONS REMOVED 107 01 PERIOD AVG FLOW RATE 204 PERIOD PERCENT OPERATIONAL 76% scfm =Standard cubic feet per minute NS=Not sampled lbs R Pounds a Data prior to 1998 was reported by Brown&Caldwell =Not available or not applicable b System startup NO =Non-detectable above detection limit c Hour meter installed 4/3100 ppmv =Parts per million by volume Density of benzene=7 34 pounds per gallon TPH =Total petroleum hydrocarbons Density of gasoline=61 pounds per gallon 077 4193019010&M Tables 11/3/00