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TABLE 5 <br /> LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION # 172, STOCKTON, CA <br /> WELL/ ANAL'YTICALTARAMETERS <br /> SAMPLE DATE ` PIR a TE <br /> X MTBE COMMENTS <br /> fD SAMPLED (PPMV) rov v my miV my <br /> INLET 06/21/01 588 76 41 11 52 14 <br /> 07/16/01 245 1 4 8 3 5 21 1 1 <br /> 08/08/01 363 5 1 19 46 26 32 <br /> 09/12/01 227 43 14 043 19 2 <br /> 10/18/01 247 21 15 3 21 11 <br /> 11/14/01 90 034 56 1 67 03 <br /> 12/19/01 < 5 <0 01 004 <0 01 01 <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 Oil <br /> 03/29/02 508 2 15 27 20 2 <br /> NOTE Benzene,toluene,ethlybenzene,and xylene analyzed by EPA method 8021B <br /> Total petroleum hydrocarbons(TPH)analyzed by EPA method 8015M <br /> Methyl-tert Butyl Ether(MTBE)analyzed by EPA method 8021B <br /> 172TRB4 VES wells Page 3 of 3 4/22/02 <br />