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TABLE 4 <br /> LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION#171, STOCKTON, CA <br /> . .1 <br /> ANALYTICAL PARAMETERS <br /> LE DATE L=L).vMv <br /> B T E X MTBE COMMENTS <br /> ID AMFLIE✓D my ntr tnv tnv <br /> 10/11/04 238 39 22 42 20 72 <br /> i 1/O8/04 861 2 S 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 3 7 15 088 <br /> 09/08/05 146 070 17 40 19 052 <br /> NOTE Benzene,toluene,ethlybenzene,and xylene analyzed by EPA Method 8021B <br /> Total petroleum hydrocarbons(TPH)analyzed by EPA Method 8015M <br /> Methyl-tent Butyl Ether(MTBE)analyzed by EPA Method 8021 B <br /> *MTBE 8021B/TO-14 <br /> 171 TA B4 VES wells Page 7 of 7 912212005 <br />