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r TABLE 4 <br /> LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION# 171, STOCKTON, CA <br /> WELL/ ANALYTICAL PARAMETERS <br /> SAMPLEDATE TPH B T E x MTBE COMMENTS <br /> ID SAMPLED my my my my my nxv <br /> D5/16100 47 <0 02 <0 02 012 262 *0 78/<0 04 _ <br /> 67/11/00 27 <0 05 0 1 <0 05 06 <0 5 <br /> 08/09/00 10 <001 005 <0 01 06 <0 1 <br /> 09/20/00 25 003 021 0 1 2 <0 1 <br /> 02/08/01 379 1 92 5 27 *1 /0 13 <br /> 03/13/01 537 54 13 6 28 12 <br /> _ <br /> 04/17/01 15 003 021 0 11 1 43 <0 1 _ <br /> 05/09/01 153 0 14 25 1 8 *04/0 11 _ <br /> _06/12/01 _ 193 042 43 2 14 *03/0 84 <br /> 07/17/01 261 082 5 8 1 7 12 1 3 <br /> 08/07/01_ __604 46 13 27 28 47 _ <br /> 09/04/01 394 5 94 2 11 3 6 <br /> 10/16/01 1,540 21 34 46 37 23 <br /> 12/14/01 451 43 20 4 28 5 6 <br /> 01/15/02_ 483 26 12 22 22 74 _ <br /> 02_107/02 591 3 3 13 3 19 4 <br /> 02127/02_-- -464 2 1 10 T- 3 - 31 2 —--- - - - - __ <br /> 03/12/02 433 1 3 92 3 31 1 2 <br /> 04/18/02 330 1 5 1 6 8 1 1 <br /> 05/14/02 _ 220 07 311 1 11 085 <br /> 07/16/02 738 1 7 97 2 I 14 1 7 <br /> 08/13/02 1,210 16 35 425 18 45 <br /> 09/10/02 420 72 18 24 87 77 �� <br /> 10/09/02 556 10 66 94 37 21 <br /> 11/14/02 3,410 98 206 26 86 904 <br /> 12/11/02 9,170 174--- 282_ _4 7 106_ 2,110 _ <br /> 01/OT/C�37 19,600 411 643 53 191 951 <br /> _ 01/30/03 11,100 89 186 24 102 134 _ <br /> 02/11/03 2,170 6 105 37 166 <2 5 <br /> 03112/_03 1,310 20 76 16 54 10 <br /> 04/08/03 361 37 25 55 23 24 <br /> 05/13/03 374 42 63 87 60 19 <br /> 06/17/03 120 09 26 0 12 049 70 _ <br /> 07116/03_ 232 0 15 20 1 7 80 <0 1 <br /> 08/05/03 279 035 16 035 25 0 19 <br /> _09/09/03 281 067 14 49 20 087 T T T <br /> 10/14/03 1,180 8 1 42 48 26 41 <br /> 11/18/03 1,160 56 58 91 32 14 <br /> 12/08/03 663 42 35 6 I 32 40 <br /> 01/12/04 1,010 59 82 11 71 16 <br /> 02/23/04 528 166 421 1 19 501 , 1 84 <0 001 BTEX&MTBE by TO-15 _ <br /> 03/16/04 368 033 1 2 07 77 05 <br /> 04/05/04 19 044 30 064 3 3 017 <br /> 05/10/04 540 10 62 75 29 7 5 <br /> 06/07/04 1,770 12 51 44 16 50 <br /> 07/07/04_ 2,190 70 5 20 13 30 <5 0 <br /> 08/16/04 590 402 223 699 206,967 <0 001 BTEX&MTBE by 10-I5__ _ <br /> 10/11/04 238 39 22 42 20 72 <br /> 11/08/04 861 25 20 3 3 16 90 <br /> 12/06/04 547 72 15 14 6 21 _ <br /> 02/07/05 <25 17 30 54 25 27 <br /> 03/07/05 531 06 22 13 34 27 <br /> E Benzene,toluene,ethlybenzene,and xylene analyzed by EPA Method 8021 B <br /> Total petroleum hydrocarbons(TPFI)analyzed by EPA Method 9015M <br /> Methyl-tert Butyl Ether(MTBE)analyzed by EPA Method 8021B <br /> *MTBE 8021 B/TO-14 <br /> 1717,4134 VT I?wdlk Pagc 6 of 6 3/18/2005 <br />