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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 ANALYTICAL PARAMETERS <br /> AMPLE DATE TPH S T E X MTBE COMMENTS <br /> ID SAMPLED my rx►v my rnv my rr�v <br /> 10/16/01 1,540 21 34 46 37 23 _ <br /> 12/14/01 4_51 4 3 20 4 28 56 <br /> 0111_5102 __59_j <br /> _483 3 26 _- 12 __ 2 2 - - 7 4 <br /> 02/07/02 59 3 13 _3 � 1-99 4 <br /> 02/27/02 464 -2-1 10 _ 3 31 2 <br /> 03/12/02 433 1 3 92 3 31 12 _ <br /> -04118102 330 _1 - 5 16 8 - 1 1 <br /> 6/14/02 220 _T 0 7 3 1 1 1 1 1 085 <br /> 07/16/02 738 1 7 9 7 2 1 14 1 7 <br /> 08/13/02 1,210 _ 16 - 35_- _ 425 - 18 _-- 45— <br /> 09/10/02 420 72 18 24 87 77 <br /> 10/09/02 556 10 66 94 37 21 <br /> 1 1114/02 3,410 98 206 -T 26�- 86 --- 904 - --- <br /> -12/11/02 9,170 174 282 -- 4T___ 106 <br /> 01/07/03 19,600 __ 411__643 _ 53 __ _ 191 951 <br /> 01/30/03 11 89 1$6 24 __ 102 - 134 <br /> - 02/11/03- 31 <br /> --2,170 6 -- 54 105--_ 37 - - - <2 5 -- --` - - <br /> 03/12/03 1, 0 �- 20 76 16 � 54 10 <br /> _ 0410810_3 361 -� 37 -_ �25_ 55 23 24_ <br /> 05/13/03 374 4 2 63 8 7 60 _1 9 <br /> 06/17/03 120 0 9 _ -2 6 0 12 C49 ^ - 7 0 <br /> 07/16/03 232 013 26 1 7 80 <0 <br /> 08/05/03 279 035 1 6 035 25 0 19 <br /> 09/09/03 281 067 14 49 20 0 87 <br /> 10/14/03 1,180 8 1 42 49 26 41 <br /> 11/18/03 1,160 5 6 58 8 1 32 14 <br /> 12/08/03 663 4 2 35 61 _ 32 40 <br /> 01/12/04 1,010- - 59 -_ 82 - -_ 11 —_ _71 --- 16 - _ -----_-- - <br /> 02/23/04 528 1 6_6 4 21 f 1 19 5 O1 , 184 F <0 001 BTEX&MTBE by TO-15 <br /> 03/16/0_4 368 0 33 12 _ 0_7 _ _7 <br /> 04/05/04 19 04 30 v 064 33 0 17 <br />' 05/10/04 540 10 _,-62 75 29 - f 75 - - - -- <br /> 06/07/04 1,770 12 51 4 4 16 50 <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 8021 B/TO-14 <br />' 171 TAR4 YES wells Page 6 of 6 6118104 <br />