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TABLE 4 LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS THRIFTY OIL STATION N 171, STOCKTON, CA fEl ANALYTICAL PTERS DATE TP)l B � MTBE COMMENTS SAMPLED my m-v my my m 03/21/00 426 29 198 736 _432 __ *0 75/0 31 - 04/18/00 <0 4 019 _ 0 64 <0 02 0 99 <0 04 05/16/00 67 I _ 0 22 T 2 55 _ 1 26 145 *1 91 /0 59 07/11/00 270 <_0-05 _ 62 22 21 <0 5 08/09/00 1 109_ _ 006 2 1 8 <0 1 - -- _ 09/20/00 29 0T2_ 0 5 _ 01 1 —*0 32/0 1 _ 02/08/01 _ 148 0 03 2 _ 1 3 _ 17 _ *032/0 3 - 03/13/01 10 70 01 _ 0 [1 0 1 - 06 04/17/01 181 633 - -0-34- -4-4__ T_75_ _ 1T _ <6--2- _ 05/09/01 68 - <0 01 0 34 0 2 3 2 03 _ 06/12/ 1 _- 93 <0_01 -6 22- 20_01 0 2 *0 14/0 3 07/17!01 25 <0 O 1 0 2 08/07/01 - 69 -- 0 1 --- - T-- _-0 21 _F2 1 2 - 022 -- �11/28101 160 12 27 _ 05 54 17 02/07/02 _ 653 - 3 - -— 12 _ 2 l _ 12 ---- 4 -- ---- _05/14/02 220 0 53 4 4 0 7 51 04 08/13/02 _121 _ I_ 3 6 048 23 --- 02/11/03 70 0 87 -- _8 4 -- l 6 -- 97 TB-7 08/24/99 7,400 220 95 _ 110 380_ 220 _ _ 11/09/99 1,800 47 29 61 220 <20 - -- - 12/15/99 280 0 18 _1 8 _l 9 14 -3-3 -- _02/15/00 _320 2 5 3 6 _4 _ 2_5_ 5 9 ---- -- - - - 03/21/00 <0 40 -<0 02 <0 02 <0 02 <0 04� <0 04 02/08/01 - - 12- --<001 ---o i—— ----1 --- -<o l— - — - — -- - 08/07/01 33 <0 01 03f 00 _ ___033 <0 I- 11/28/01 - v 11/28/01 <5 _ <0 01 0 03 _<0_ 001 X0_03 <0 1W - -- 02/07/02 <5_ <0 01_ LL 00-5 0 04 ---12 1 <0 1 m 11/14/02 5,520 186 _ 357 _34 121 _ 1,030 02/11/03 50 007 2 l 0 72 46 0-15-- TB-9V 15TB-9V _ 08/24/99 4,700 42 75 72 270 120 11/09/99 1,200-- 13 -- _27 22 - -100 21 - - 12/15/99 _310_ 674 23-- 0 7802/15/00 _ 67066 — 4 9 - --3 9 _ 13 ---_ 49 -- _--- _---- 03/21/00 370 131 7 7 6 74 _ 37 7 *0 4 _ 1 /<0 04 - 04/18/00 _270 _1_35 _ j--7- 5 04 232 *06110 17J 05/16/00 287 1 13 8 72 -5-04 45 1 *2 27/0 42 — —07/11/00 532 0 15 3 3 1-9 20 <0 1 08/09/00 205 0 13 23 1 4 11 <0 2 - 09/20/00 1,100 1 8 10 78 <1 6 02/08/01 _ 33 <0 01 014 0 12 23 <0 1 03/13/01 215 _ 0 13 _ 5 3 2 23 <0 2 T 04/17/01 479 06 5 52 67 44 _ _ _0_24 05/09/01 44 _ 002 0 5 0 21 3 4 O 33 Not suTficient sample to do MTBE TO 14 06/12/01 - 36 _0_04__ 1 0 5 7 _*0 531 1 5 07/17/01 _ _ 51 _0_02 T 0 55 _ 0 3 32 <0 1 - 08/07/01 _580 5 1 i 12 3 1 43 7 - -- - - 11/28/01 282 002 0_ 5 3 3—_ _25 <0 I - - - - — --- - 02/07/02 539 22 8 3 24 l i -4 4 - 4 --- -290 "T ---0 1 -- -_'___-- -- - -07 - 08/13/02 112 - 1 5_ 45 -- 039 -- 1 7 -- - 18 - 02/11/03 - 54-_-- 008 --- 22 ----075 90-_ -- 019 -- -- - - -_ - 1711AB-1 VL5 t+c11% Page 2 rf5 3111/03