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TABLE 4 LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS THRIFTY OIL STATION#171, STOCKTON, CA WELL I ANALYTICAL PARAMETERS AMPLE DATE TPH B T E X MTBE COMMENTS ID :j SAMPLED rtty my my my myI............(ppmv 07/27/99 7,900 130 350 79 320 *190/77 08/24/99 6,000 110 310 59 260 120 09/14/99 8,700 35 160 41 200 38 10/14/99 2,800 30 110 26 110 28 ]109199 1,000 16 53 21 99 <20 12/15/99 19 <01 017 <01 61 <1 _ 01/18/00 790 87 30 12 61 93 03/21/00 985 382 247 198 94 1 *0 89/038 04/18/00 642 247 154 139 639 0 641<0 04 05/16/00 47 <0 02 <0 02 0 12 262 *0 781<0 04 07/11/00 27 <0 05 0 1 <0 05 06 <0 5 08/09/00 10 <0 01 005 <0 01 06 <0 1 09/20/00 25 003 021 0 1 2 <0 1 02/08/01 379 1 92 5 27 *1 /0 13 03/13/01 537 54 13 6 28 12 04/17/01 15 003 021 0 1 1 1 43 <0 1 05/09/01 153 0 14 2 5 1 8 *0 410 11 06/12/01 193 042 43 2 14 *03/084 07/17/01 261 082 5 8 1 7 12 1 3 08/07/01 604 46 13 27 28 47 09/04/01 394 5 94 2 11 36 10/16/01 1,540 21 34 46 37 23 12/14/01 451 43 20 4 28 56 01/15/02 483 26 12 22 22 74 02/07/02 591 3 3 13 3 19 4 02/27/02 464 21 10 3 31 2 03/12/02 433 1 3 92 3 31 1 2 04/18/02 330 1 5 16 8 1 1 05/14/02 220 07 3 11 1 11 085 07/16/02 738 1 7 97 2 1 14 1 7 08/13/02 1 210 16 35 425 18 45 09/10/02 420 72 18 24 87 77 10/09/02 556 10 66 94 37 21 11/14/02 3,410 98 206 26 86 904 12111/02 9 170 174 282 47 106 2,110 01/07/03 19,600 411 643 53 191 951 01/30/03 11,100 89 186 24 102 134 02/11/03 2 170 6 105 37 166 <2 5 03/12/03 1310 20 76 16 54 10 04/08/03 361 3 7 25 5 5 23 24 05/13/03 374 42 63 87 60 1 9 06/17/03 120 09 26 0 12 049 70 07/16/03 232 0 15 20 1 7 80 <0 1 08/05/03 279 035 1 6 035 25 019 09/09/03 281 067 14 49 20 087 NOTE Benzene,toluene,ethlybenzene,and xylene analyzed by EPA Method 8021 B Total petroleum hydrocarbons(TPH)analyzed by EPA Method 8015M Methyl-tert Butyl Ether(MTBE)analyzed by EPA Method 8021 B *MTBE 1021BITO-14 • 1-11.4134 V1 1 m/A PaKc 5 of j 9130103