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TABLE 3 Vapor Extraction Operating Data Thrifty Oil Station # 172, Stockton, CA Hoar Meter inlet Hydrocarbons Removed Dated Reading Duration Flaw Rate lab Concenitretions Period Cumulative Comments (hrs) (hrs) (t(m) Ftpmv u:g/L tom) (lbs) 4112101 1 - 200 #N/A 9 100 - 0 Only 2 hrs run sampling for APCD 4126101 3 2 200 9 100 136 14 Startup System 5110101 333 330 200 7 873 34 764 5 413 7 5 427 Concentration is averaged from wells 5124101 672 339 206 34 764 8 947 3 14 375 6121101 1 344 672 210 588 2 600 9 766 1 24 141 7/5101 1 671 327 211 2 600 6693 24 810 7/12101 1 840 -- 169 210 - -- - 2 600 3459 ---- 25 156 - 7/16101 1,960 120 210 245 1 080 1734 25 329 7119101 2030 70 211 1 080 595 25 389 7126101 2 147 117 266 1 080 1127 25 502 Found system off restarted -- 812101 2 289 142 214 1 080 1377 25 639 -- -- - 818101 2 431 142 213 363 A 1 600 1519 25 791 T 8114101_ 2 580 149 216__ 1 600 1913 25 982 Shut down system for QWS 8116101 2,580 0 - 1 600 00 25 982 Restarted system 8123101 2 746 166 196 1 600 1947 26 177 8131101 2 935 189 195 ---- 1 600 221 1 - - 26 398 - -- - 9/6101 3 083 148 224 1,600 1855 26 584 9/12101_ 3 223 140 216 227 1 600 1843 26 766 9/20101 3 417 194 198 1 600 2403 27 008 _ 9127101 3 586 169 201--- -�� 1 600 201 8 -- 27 210 - - 1014/01 3 754 168 196 1,600 1996 27 410 10/11/01 _ _ 3 920_ _ 166 _ 211 1 600 _2021 _ 27 612 T __ 10/18/01 4 092 172 195 247 1 090 1756 27 788 10125!01-- - 4 254 --- _ 162--- - 196 ------ 1 090- - - 1298-- �- - 27 917 - 1112101 4442 _ 188 _196 _ _ 1 090_ 151 0 28 068 Shut down system for QWS 1119101 4,446 4 196 1 090 32 28 071 Restarted system 11/14/01 4 558 112 199 90 400 616 _ 28 133 11121/01 4 720 f 162 196 400 479 28 181 41/29/01 - 4 914 194 197 --- 400 570 28 238 - ^ 1216101 5 059 145 199 400 430 28 281 12/13/01 5 196 137 196 400 405 28 321 Found system off restarted 12/19/01 5 313 117 196 T (ND) 2 5 (ND) 11 05 176 W 28 339 12/27/01 5 387 74 196 11 05 06 28340 Found system off restarted 113102 5 549 162 196 ----- ` 11 05 1 3 28,341 - 1/10IO2 5 718 169 200 11 05 14 28 342 Knockout switch shut down VES restarted 1/18102 5 831 T T 113 210 11 05 10 28 343 Knockout switch shut down VES restarted 1124102 5 954 123 201 139 616 296 28 373 Y 1131102 6 043 89 201 616 41 2 28 414 216102 6 137 94 201 616 435 28 458 Knockout switch shut down VES restarted 2!7/02 6 160 23 201 8 35 56 28 463 2!14102 6 324 164 202 35 v 43 28 468 2120102 6 467 143 201 35 38 28 471 System shut down for QWS 2121102 _ 6 467 0 - 35 00 28 471 Restarted VES after QWS 2/27102 fi 610 143 197 35 37 28 475 317102 �_ 6 800 190 199 35 49 28 480 3114102 - 6970 170 -- —201 - -23 103 88 28 489 -- - 3121102 7 138 168 201 103 130 28 502 3/28!02 7 304 166 203 508 2 250 _ 147 5 28 649 414!02 7 469 165 206 2 250 -- 2839 28 933 -- - 014tab3 - -- -�— Page 1 of 3 - - - - - - - - 3/11/03