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TABLE 5 <br /> LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION # 172, STOCKTON, CA <br /> L <br /> L/ ANALYTICAL PARAMETERS <br /> LE DATE TPH S T E X MTBE COMMENTS <br /> SAMPLED mv) my snv my my my <br /> INLET 06/21/01 588 76 41 11 52 14 <br /> 07/16/01 245 1 4 8 35 21 1 1 <br /> 08/08/01 363 5 1 19 46 26 3 2 <br /> 09/12/01 227 43 14 043 19 2 <br /> 10/18/01 247 21 15 3 21 1 1 <br /> 11/14/01 90 034 5 6 1 67 03 <br /> 12/19/01 < 5 <0 01 004 <0 01 0 1 <0 1 <br /> 01/24/02 139 005 1 041 4 <0 1 <br /> 02/07/02 8 <0 01 <0 01 002 02 <0 1 <br /> 03/14/02 23 <0 01 04 02 1 7 0 11 <br /> 03/29/02 508 2 15 27 20 2 <br /> 04/18/02 < 5 <0 01 003 <0 01 <0 03 <0 1 <br /> 05/30/02 < 5 <0 01 006 006 033 <0 1 <br /> 06/20/02 1,120 13 65 63 27 185 <br /> 07/18/02 1,060 15 22 26 12 85 <br /> 08/15/02 712 12 21 32 68 69 <br /> 09/12/02 483 66 14 1 52 128 <br /> 10/17/02 2,640 23 36 37 12 173 <br /> 11/14/02 1,090 16 23 2 39 482 <br /> 12/12/02 9,440 172 461 5 113 2,920 <br /> 01/09/03 556 12 26 1 1 16 97 <br /> 02/11/03 707 1 1 36 10 101 083 <br /> 03/13/03 2,020 24 39 76 38 56 <br /> 04/10/03 869 17 48 39 16 44 <br /> 05/27/03 2,370 18 128 18 72 31 <br /> 06/12/03 590 22 60 72 42 13 <br /> 07/10/03 445 15 28 79 52 24 <br /> 08/14/03 516 77 52 68 37 79 <br /> 09/11/03 633 038 25 063 27 02 <br /> NOTE Benzene,toluene, ethlybenzene,and xylene analyzed by EPA method 8021E <br /> Total petroleum hydrocarbons(TPH)analyzed by EPA method 8015M <br /> Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8021 B <br /> • <br /> 172 TA 95 YES ivells Page 5 of 5 9/30/03 <br />