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T*E 3 Vapor Extraction Operating Data Thrifty Oil Station # '172, Stockton, CA Hour Meter Cumultive Hrs since Inlet Hydrocarbons Removed Date Reading Operation last visit Flow Rate Lab Concentrations Period Rate Cumulative Comments (hrs) (firs) (hrs) (cfm) ppmu ug/L (Ibs) (lbs/day) (Ibs) 5/27/2004 9,642 22 096 1 231 206 - - 2,220 3961 41 1 86,233 6/2/2004 9 771 ~--22 225 129 203 - 2 220 219 0 408 86 452 _ - -- _ - "Lab report Micates'does not resemble 6/8/2004 9,908 1 22 362 137 206 1 680* 6,850 °� 4752 832 86,928 gasoline pattern 6/15/2004 10 047 22 501 139 206 6 850 733 6 126 7 87 661 6123/2004 10 200 1 22,654 153 203 6,850 801 6 1257 88,463 - 6/28/2004 10,308 22,762 108 206 6 850 5658 1257 89029-- V712004 90297(712004 10,502 I 22,956 194 206 1,990 8,150 1,1210 1387 90,149 7/13/2004 10,597 23,051 95 204 8 150 5936 150 0 90743- 7/20/2004 10 728 23,182 131 201 8,150 808 6 1481 91 552 7/27/2004 10,872 23,326 144 201 8 150 882 2 147 0 92,434 Found system oft motor for big blower for 8!3/2004 10 877 23,331 5 201 T 8,150 306 1470 92,465 replacement 8,i 50 24 5 147 0 92 489 Restarted to install new new motor for blower 8/9/2004 10 881 23,335 4 shut down system for QWS 8!1912044 10,881 23 335 0 203 8,150 0 0 - 92,489 Restarted Found system off big blower belt replaced 8/26/2004 10,891 23 345 10 201 456 1,870 378 908 92,527 restarted 9/1/2004 10,898 23,352 7 201 1,870 98 337 92,537 Found system off extraction blower frozen 9/28/2004 10,898 23 352 0 - 1 870 00 - 92,537 WE system off extraction blower taken out for repair or replacement 1,870 0 0 _ 92 537 SVE system still off pending installation of new 12!2812004 10, 98 8 23 352 0 extraction blower NOTE Inlet concentration is obtained from laboratory analytical result for Total Petroleum Hydrocarbons(TPH) and assumed the same until the subsequent sampling 014tab3 Page 6 of 6 1/19/2005