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Table • Soil Vapor Extraction System Performance Data ARCO Service Station#2133 2908 Benjamin Holt Drive,Stockton,California TPH as Gasoline Benzene Flt} 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 -- -- 4,815 604 INFL 02/15/00 4,815 604 INFL 03/14/00 - b 30 132 5 0 392 02 00 4,815 008 3 4E 03 00 604 INFL 04/03/00 0 c 40 197 4 0 NO 00 10 4,816 003 1 9E-03 003 604 INFL 04/26/00 552 26 188 2 0 NO 10 48 4,821 002 1 3E 03 002 604 INFL 05/25/00 704 40 167 4 0 NO 00 95 4,825 004 1 8E 03 005 605 INFL 06/29/00 1 544 41 187 9 0 433 03 15 4 827 NO 00 003 605 INFL 07/27/00 2,053 47 246 22 0 3070 30 354 4,862 048 3 7E 02 039 609 INFL 08/31/00 2,529 70 170 6 0 NO 00 299 4,892 003 1 3E 03 036 61 3 INFL 09/27/00 3,177 41 195 7 0 NO 00 00 4,892 ND 00 002 61 3 INFL 10/23/00 3,804 d 30 329 0 0 NO 00 00 4,892 ND 00 000 61 3 INFL 11/20/00 3,804 d - 0 0 00 00 4,892 00 000 61 3 INFL 12/14/00 3,804 d - 0 0 00 00 4,892 00 000 61 3 REPORTING PERIOD 9/27100 TO 1210/00 TOTAL POUNDS REMOVED 4,8972 613 TOTAL GALLONS REMOVED 8028 84 PERIOD POUNDS REMOVED 00 00 PERIOD GALLONS REMOVED 00 00 PERIOD AVG FLOW RATE 262 PERIOD PERCENT OPERATIONAL 1006/6 scfm =Standard cubic feet per minute NS=Not sampled lbs =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 413/00 ppmv =Parts per million by volume d SVE system turned off due to low influent concentrations TPH =Total petroleum hydrocarbons Density of benzene=7 34 pounds per gallon Density of gasoline=6 1 pounds per gallon 077 41930 190/0&M Tables xls 2/9/2001