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TABLE 3 Vapor Extraction Operating Data Thrifty Oil Station# 172, Stockton, CA Hour Meter Cumultive HM since I Inlet Hydrocarbons Removed Date Reading Operation last visit Flow Rate Lab Concentrations Period Rate Cumulative Comments (hrs) (hrs) (hrs} (cfm) ppmv ugA. (tbs) (IF.ufdey) (Ihs) 411212001 _____1 0 - 200 #N1A 9 1 DO _ 0 Only 2 hrs run sampling for APCD 4/26/2001 3 2 2 200 9 100 136 1634 14 Startup System 511012001 333 332 330 200 7 873 34 764 5 413 7 393 7 5 427 Concentration is averaged from wells 5124!2001 672— 671 339 206 34 764 8 947 3 6334 14 375 612112001 1 344 1 343 672 210 588 2 600 9 766 1 3488 24 141 715/2001 1 671 1 670 327 211 - 2 600 6693 491 24 810 7!1212001_ 1 840 1 839 169 210 2 600 3459 491 25 156 _ 7!1612001 1 960` 1959 120 210 245 1 080 1734 347 25 329 7!1912001_ _ j-03-0 2 029 70 211 1 060 595 204 25 389 712612001 2 147 2-1-Z-- 117 266 _ _ 1 060 1127 231 25 502 Found system off restarted 8/212001 - 2 289 2 288 142— 214_ _ 1 080 1377 233 25 639 8/812001_ 2 431 _2 430 142 213 363 1 600 151 9 25 7 �25 791 - __ 811412001 2 580 2 579 149 216 1 600 1913 308 25 982 Shut down system for QWS 8/1612001 2 580 2 579 0 1 6O0 00 25 982 Restarted system 812312001_ 2 746---274-5- 166 196 1 660 194 7 281 26 177 813112001 _ 2 935 2 934 189 195 1 600 221 1 28 1 26 398 9/612001 3 C83 3 082 148 224 1 600 1855 301 26 584 9/1212001 3 223 3 222 140 216 227 1 600 1843 316 26 768 9120!2001 3 417 3 416 194 198--_ ^` 1 600 2403 29 7 27 DOB 912712001 3 586 3 585 169 201 1 600 2018 287 27 210 _ 1014!2001 3 754 3 753 168 196 1 600 199 6 285 27410 10!1112001 _ 3920 3919 166 211 ------ 1600 _2021 292 27612 10!1812001 4 092 4 091 17 195 247 1 090 1756 245 27 788 1012512001 4 254 4 253 u2 162 198 - _ f 1 090 129 8 19_2 27 917 111212001 4 442 4 441 188 196 1 090 1510 193 - 28 068 Shut dawn system for QWS 11/9/2001 4 446 4 445 4 T 196 1 090 32 192 _ 28 071 Restarted system 1111412001 4 558 _ 4557 112 199 90 400 61 6 132 28 133_ 1112112001 4 720 4 719 162—--_196 - -- 400 479 7 1�_ 28 181 I 112912001 4 914 T 49 1 3 194 197 _ ____ _ 400 _ 57 0 -_ 7 1 _ _ 28238 121612001 5 059 I 5 055 145 ---199_ __ _ _- 400 4311 7 1 _ _—-28 281 -- 12/1312001 5 196 t+---5 195— 40 I 137 196 0 40 5 7 1 28 321 Found s systt em oft restarted _ 12/1912001 6 313 5 312 iI 117 196 (NM 2 5 MM 11 05 176 36 28 339 _ 12/2712001 5 387 5 386 E-" 74 _ 196 �_- _ 11 05 06 02 - 28 340 Found system off restarted V312002 55495548 162 _196 11 OS 13 02 _ 28 341 111012002 5 718 j 5 717 169 200 � i 1105 14 02 28 342 Knockout sw,tch shut down VES restarted 111812002 5 831 _t 5 830 113 210 �11 05 _ 10 02 28 343 Knockout switch shut dawn VES restarted 112412002 5 954 t 5 953 123 T 201 -_ -139 616 29 6 - 5 8__- 28 373 113112002 6 043 1 60-- ' T 89� 201 — 616 41 2 11 1 28 414 2!6!2002 6 137 6 136 94 201 616 435 11 1 28 458 Knockout switch shut down VES restarted 27712002 —61-60 6 159 23 201 8 35 56 59 28 463 211412002 6 324 6 323 164 202 35 F 43 06 28 468 212012002 6 467 _ 6 466 143 201 35 38 05 28 471 System shut down for QWS 2/2112002 5 467 6466 0 35 _ 00 28 471 Restarted VES after QWS 2/2712002 5 610 6 609 143 197 35 37 06--_ 28 475 3!712002 6 800 6 799 190 199 35 49 06 28 460 3/14)2002 6 970 �-r6 969 170 201 _ 23 103 58 12 28 489 3/21/2002 T1 2i 7 137 168 201 - 103 130 19 2B 502 - 3128/2002 7 304 7 303 166 203 508 2 250 1475 21 3 28 649 - 4/412002 7 469 7468 165 206 f _ 2 250 2B3 9- 41 3 28 933 411112002 7 637 7 636 168 205 2 250 2905 41 5 29 224 411812002 -7802 7 801 165 202 !NM 25 ,Nn) 11 05 142 0 207 29 366 412512002 7 969 7 968 167 202 1105 1 4 02 29 367 System shut down{technician on vacation) 519/2002 7 969 7968 0� 1105 00 29 367 Restarted 512312002 8 014 8 013 45 211_ 1105 04 02 29 368 Knockout swtch shut dawn VES restarted 513012002 8 182 8 181 168 212 rNnl 2 5 Mrlt 11 05 15 02 29 369 6/6/2002 -i748 8 347 166 213 1105 15 02 _ _29_37C 611312002 8,517 8 516 169 236 11 05 16 02 29 372 612412002 B 683 t 8 682 T 166 216 1 120 4 960 _—348--j 50 4 ___ 29 721612712002 9854 8 B53 _171 213 4 960 680 4 955 30 401 713!2002 8 996 _ 8_995 14_2 212 _ 4 966- - 559 8 9_4_6_- - — 30 961 _ 711012002 9 166 } 9 165 v170 _—213 --4-960- 6701 94 6 31631 711612002 9 350 9 349 v184 203 1 060 4 670 _^ 6892 899 32 320 7/2512002 9 523 9 522 173 213 4 670 6285 872— 32949 61112002_ - 9 687 9 686 _164 203_ _4 670 5958 872 33 545 8!812002 9 847 9 846 160 _203 4 670 5673 85 1 34 112 0!1312002 9 963 9 962 116 203 --466-70 4670 411 3 —8-51 _ 34 523 System shut down for_QWS 8!1412002 9 963 T 9 962 _0 4670 -- _-0 0 _ 34_523 Restarted mm � 6115f2002 _ 9 976 9975 a_ 13 201 _ 712 _2 910 37 0 68 4 W__34 560 - J 014tah3 Page i of 4 10/2-WO05