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TABLE 4 <br /> t LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS <br /> THRIFTY OIL STATION# 171, STOCKTON, CA <br /> ELL l ANALYTICAL PARAMETERS <br /> AMPLE DATETPH B T E X MTBE COMMENTS <br /> ID SAMPLED my my my my my my <br /> 09/04/01 394 5 94 2 11 3 6 <br /> 10/16/01 1,540 21 34 46 37 23 _ <br /> 12/14/01 451 43 20 4 28 56 <br /> 01/15/02 483 26 12 22 22 74 <br /> 02/07/02 591 3 3 13 3 19 4 <br /> 02/27/02 464 21 ]0 3 31 2 <br /> 03/12/02 433 1 3 92 3 31 1 2 <br /> 04/18/02 330 1 5 16 8 11 <br /> 05/14/02 220 07 311 1 11 _ _ 085 <br /> 07/16/0_2 _738 17 97 _ 21 14 17 <br /> 08/13/02 1,210 _ 16 35 425 18 45 <br /> _09110102 _ 420--- 72 —-- 18- — 24 —_ ___S 7_ <br /> 10/09/02_ 556 10 66 94 37 21 <br /> 11/14/02 3,410 98 206 26 86 904 <br /> 12/11/02 _9,170 174 282 47 106 2,110 <br /> _01/07103 19,600 411 643 53 191 95_1_ <br /> 01/30/03 11,100 89 186 24 102 _ 134 <br /> 02/11/03 2,170 6 105 37 166 <2 5 <br /> 03/12/03 1,310 20 76 16 54 l0 _ <br /> 04/08/03 361 37 25 5 5 23 24 _ <br /> 05/13/03 374 42 63 87 60 1 9 <br /> 06/17/03 120 09 26 012 049 70 <br /> 07/16/03 232 0 15 20 17 80 <0 1 <br /> _08/05103 279 035 1 6 035 25 0 19 _ <br /> 09/09/03 281 067 14 49 20 087 _ <br /> 10/14/03 _ 1,180 8 1 42 48 2_6 41 T <br /> 11/18/03 1,160 5 6 58 8 1 32 14v_ _ _ <br /> _ 12/08/03 663 _ 4235 6 l 32 _4 0 <br /> 01112/04_ 1,010 5 9 _ 82 — -- 11 — -- 71 _ _ _16 <br /> 02/23/04 528 1 66 _ 4 21 _ <br /> _1 19 501 , 1 84 <0 001 BTEX&MTBE by TO-15 <br /> _ 03/16/04 36_8 0_3_3_ 1 2 _ 0 7 77 05 <br /> 04/05_/04 19 _0_44 3 0 064 3 3 _ 0 17 <br /> _ <br /> 05/10/04 _540 _ 10 62 7 5 29 7 5 <br /> _ <br /> 0610_7104 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 33 16 90 <br /> 12/06/04 547 72 15 14 6 21 <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 8021 B <br /> *MTBE 80218/TO-14 <br /> 1711AB4 VPS welly Page 6 of 6 12120 2004 <br />