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i Table A-1 Sod Vapor Extraction System Performance Data ARCO Service Station#2186 3212 N California Street, Stockton,California System Data FID GRO Benzene MtBE Influent Influent MtBE Hour Meter Average Concen- Removal Net Removed Concen Removal Net Removed Concen- Removal Net Removed Sample Date Reading Flow Rate Influent Midpoint Effluent tration Rate Removed to Date tration Rate Removed to Date tration Rate Removed to Date ID Sampled (hours) (scfm) (ppmv) (ppmv) (ppmv) (ppmv) (lbs/day) (pounds) (pounds) (ppmv) (lbs/day) (pounds) (pounds) (ppmv) (lbs/day) (pounds) (pounds) INFL 08/30/04 45 95 111 01 01 - - -- - INFL 09/07/04 9 4 a 100 - 00 390 1174 93 64 9364 <0 31 000 000 000 98 030 241 241 INFL 11/30/04 00 b 196 23 02 00 98 607 000 9364 <0 15 000 000 000 15 010 000 241 INFL 12/09/04 2162 109 28 03 01 140 483 4354 13718 <0 15 000 000 000 1 3 005 041 282 INFL 01/06/05 5430 118 67 00 00 140 523 71 25 20844 020 001 009 009 22 008 1 15 396 INFL 02/02/05 1,0593 125 106 03 00 130 515 11073 31917 <0 15 000 000 009 15 006 131 527 [NFL 03/07/05 1,799 6 128 155 185 23 150 608 18759 50676 <0 15 000 000 009 04 002 049 576 REPORTING PERIOD FIRST QUARTER 2005 TOTAL.POUNDS REMOVED 5068 009 576 TOTAL GALLONS REMOVED 831 001 093 PERIOD POUNDS REMOVED 3696 009 294 PERIOD GALLONS REMOVED 606 001 048 PERIOD AVG FLOW RATE 124 scfm =Standard cubic feet per minute ppmv =Parts per million by volume - =Not available or not applicable lbs =Pounds GRO =Gasoline Range Organics <6 3 =Less than indicated laboratory reporting limit a System shutdown due to excessive noise issues Hour meter was not working Mass removal calculations are based on the assumption that the system ran continuously between 08/30/04 and 09/07/04 at the same concentration and flow rates b System was restarted on November 30,2004 with sound enclosure and new hour meter 2186 O&M Tables 1005 T.kl. e_, Pane 1 of 1