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TABLE 4 <br /> LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION#171, STOCKTON, CA <br /> WELL I ANAI(.,rYTICAL PARA>!1'1ET911S <br /> AMPLE DATE TPR B � COMMENTS <br /> ID SAMPLEDmvj <br /> �ppmvnv)...l tE " 1Y1fiE <br /> 01/15/02 483 26 - 12_ 22 22 74 <br /> 02/07/02 591 --T3--- l3 3 19 4 <br /> _02/27/02 _464 21 10 3 _ 31 2 <br /> 03112/02 433 1 3 92 3 31_ 1 2 <br /> _ J� <br /> 04/18/02 330 1 5 _ 16 8 11 <br /> 05/14/02 220 0 7 —3-11 — 1 11 --6-8-5 <br /> 07/16/02 738 1 7 97 21 14 17 - - <br /> 08/13/02 1,210 16 35 425 18 45 - <br /> 09/10/02 420 -7-2— 18 2 4 8 7 77 <br /> 10/09/02 556 10 66 94 37 21 <br /> 11/14/02 3,410 98 _ 206 _ 26 86 904 T <br /> 12/11/02 9,170 174 282 47 106 2,110 <br /> 01/07/03 —19,60-0- 411 411 643 _53 191 _ _ 951_ <br /> 01/30/03 11,100 89 _ 186 24 _ 102 134 <br /> 02/l1/03__ 2,170 6 105 37 166 <25 <br /> 03/12/03 1 1,310 20 76 16 54 10 LL <br /> NOTE Benzene,toluene,ethlybenzene,and xylene analyzed by EPA Method 8021 B <br /> Total petroleum hydrocarbons(TPH)analyzed by EPA Method 8015M <br /> Methyl-tert Butyl Ether(MTBE)analyzed by EPA Method 8021 B <br /> *MTBE 8021B/TO-14 <br /> i <br /> • <br /> 171IAB4 VPS wcIts Page 5 of 5 <br />