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TABLE 4 LABORATORY RESULTS OF VAPOR SAMPLES FROM INDIVIDUAL WELLS THRIFTY OIL STATION# 171, STOCKTON, CA vYELL I ANALY'ITICAI.FAIKAMETERS AMPLE 1�AT Tl'I $ E X WERE, COMMENTS ID SAMPI�I�I? alae tray m v m� my m� r05/09/01 26 02 03 03 3 03 <5 <0 0 L 0 04 <0 Q 1 0 1 0 23 _ 115 <0 01 061 04 6 *0 1410 QOl 112 2 2742 2 22 0 03 _0 42 0 15 2 4 <0 1 02/07/02 - <5 ---<001 <001f 002 <003 <0I INLET 07/61/99 1_2,000 180 _ _460 94 430 *160/71_ - _ 07/12/99 3,30-0_ 71 160 _ 30 _ _I 70 *81 /35 07/27/99 7,900 130 _350 79 320 *190/77 -_-_08/724/99 - - 6,600 110 _ 310 v 59 260 120 - 09/14/99 8,700 --35 160- - -41 _ 200 _ 38 110 26� 116 -_ 28 11/09/99 1,000 --- 16- -- -53 _ 21 /9--- <20 12/15/99 _ _-- 19--- <0 1 0 17 <0 1 61 � - 01/18/OD 790 _ 8 7 30 12 61 __9_3__ 03/21/00 985 3 82 247 198 94 1 *089/039 04/18/00- 642 2 47 15 4 13 9 _ -639 0 64/<0 04 05/16/00 47 - _<D 02 <0 02 T 0 12 262 -- *0 78/<0 04 07/11/00 27 _<0 05 61 <0 05 0 6 _ <0 08/09/00 l0 <0 O1 T 0 05 <0 O1 0 6 <0 1 09/20/00 _25 —__V03 _621 —- 0 i_ - - 2 -- <0 1 ----- -- - 02/08/0! 379 1 92 5 27 *1 /0 13 - 03/13/01 537 _ 54 i3 _ 28 12 04/17/01 15 0 03 0 21 0 11 1 43 <0 1 0-09101 153- 0 14 2_5 l 8 *0 410 11 _ _ 06/12/01 _ _ 193 0 4 42 3__ 2 14 *03 /V84_ 07/17/01 261 082 59 _____T7___ 12 --08/07/01 - - - 604 4 6 _ 13 - - 2 7 —-� 28 _ 4 7 09/04/01 _ 394 __ 5_ 9 4 __ 2 11 _ 36 _T 10/16/01 1,540 21 34 T6 31-- 23 T 12/14/0-1 _ 451_ 43� 20 — 4 -- 28 --- 56Of/15/02 15/02 _483 26 12 22 22 74 f _02/07/0-2__ _ 591 T-- 33 ]3 _-3_____3]-3 -_ -_— 02/27/02 464 2 l 10 _ 3 _ 31 03/12/02 433 1 3 92 3 31 1 2 NOTE Benzene,toluene,ethlybenzene,and xylene analyzed by EPA Method 8021B Total petroleum hydrocarbons(TP1-1)analyzed by EPA Method 8015M Methyl-tert Butyl Ether(MTBE)analyzed by EPA Method 8021B *MTBE 8021B/TO-14 1'1 fAH4 VI S wells Page 4 of 4 3/28102