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TABLE 4 <br /> LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION it 171, STOCKTON, CA <br /> ELL 1 ANAL. AL MRAMETIW-Si_ <br /> PLE DATE H B TMT$E COMMENTS <br /> ID S ED v v m� tnrrL my t[iu <br /> 10/14/03 1,180 81 42 48 26 41 <br /> 11/18/03 1,160 56 58 81 32 14 <br /> 12/08/03 663 42 35 61 32 40 <br /> 01/12/04 1,010 59 82 11 71 16 <br /> 02/23/04 528 166 421 119 501 , 184 <0 001 BTEX&MTBE.by TO-15 <br /> 03/16/04 368 033 12 07 77 05 <br /> 04/05/04 19 044 30 064 33 0 17 <br /> 05/10/04 540 10 62 75 29 75 <br /> 06/07/04 1,770 12 51 44 16 50 <br /> 07/07/04 2,190 <0 5 20 13 30 <5 0 <br /> 08/16/04 590 402 223 699 206,967 <0 001 BTEX&MTBE by TO-15 <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 /> 04/11/05 70 007 32 082 32 042 <br /> 07/06/05 159 024 54 37 15 088 _ <br /> 09/08/05 146 070 17 40 19 052 <br /> 11/14/05 509 1 80 38 25 10 520 <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 8021B <br /> 0 *MTBE 8021B/TO-14 <br /> s <br /> 171TAB4 VES wells Page 7 af7 12/6/2005 <br />