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TABLE 4 LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS THRIFTY OIL STATION 4 171, STOCKTON, CA WELL 1 ANALYTICAL PARAMETERS DATE TPH I3 T E X N[TH CC) ME1 T5 SAMPLER mV ( rnv my my my my 07/11/00 616 <0 5 3 5 1 5 26 *35/0 098 08/09/00 193 0 1 1 2 1 l 3 13 <0 2 09/20/00 30 4 1 1 1 02 1 2 *12/013 02/08/01 47 7 138 27 281 <1 03/13/01 26 02 03 03 3 03 04/17/01 <5 <0 01 004 <0 01 01 023 05/09/01 115 <0 01 061 04 6 *0 14/0001 08/07/01 112 2 27 031 42 2 1 1/28/01 22 003 042 0 15 24 <0 l 02/07/02 <5 <0 Ol <0 01 002 <0 03 <0 1 INLET 07/01/99 12,000 180 460 94 430 *160/71 07/12/99 3,300 71 160 30 170 *81135 07/27/99 7,900 130 350 79 320 *190177 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 11/09/99 1,000 16 53 21 99 <20 12/15/99 19 <01 017 <01 61 <1 _ O11i8/00 790 87 30 12 61 93 _ 03/21/00 985 382 247 198 941 *0 89/038 04/18/00 642 247 154 13 9 639 0 64/<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 11 1 43 <0 1 05/09/01 153 0 14 2 5 1 8 *04/0 11 06/12/01 193 042 43 2 14 *03/084 07/17/41 261 082 58 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 4 3 20 4 28 5 6 01/15102 483 26 12 22 22 74 02/07/02 591 3 3 13 3 19 4 _ 02/27/02 464 2 1 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 NOTE Benzene toluene,ethlybenzene,and xylene analyzed by EPA Method 8021B Total petroleum hydrocarbons(TPH)analyzed by EPA Method 8015M Methyl-tert Butyl Ether(MTBE)analyzed by EPA Method 8021B *MTBE 8021B/ ro-14 1-IIAB4 V!S udIs Pag, 41?/4 5/30111