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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IDI DATE DTW S i GWE TPH-G B T E X MTBE (/'t ngt) Ut) (pl�h) (ppb) (pPhl fl�p�J (ppb) P ) MW-9 10121-22192 -- 50 0-70 0 - <50 <0 5 <05 <0 5 <0 15 - 01/13/93 -- -- <50 <0 5 <0 5 <0 5 <015 1176 04/26/93 5052 -1876 <50 <0 5 <0 5 <0 5 <0 5 -- � 07/26/93 51 50 -3974 <50 <0 5 <0 5 <0 5 <0115 -- 10/20/93 5199 -4023 <50 <0 5 <0 5 <0 5 <0 15 -- 01/17-18/942 4958 -3782 280 49 15 9 1 45 -- 02/28/942 4850 -3674 <50 <0 5 <0 5 <0 5 <0 5 -- 04125-26194 4751 -3575 <50 <0 5 094 <0 5 1�3 -- 07125-26194 4987 -3811 <50 <0 5 <05 <05 <0 5 -- 10/26-27194 5103 -3927 <50 <0 5 <0 5 <0 5 <0.5 -- 01125-26/95 4832 -3656 <50 <0 5 <0 5 <0 5 <015 - 04/26-27195 4144 -31 68 <50 1 2 41 <0 5 3 3 -- 07/26/95 4461 -3295 <50 <0 5 1 4 <05 1 2 -- 10/25-26195 4554 -3378 <50 <0 5 <0 5 <0 5 <0 5 -- 01/24/96 4274 -3098 <50 <0 5 <05 <0 5 <0 5 -- 04125/96 3778 -2602 <50 <0 5 <05 <15 <0 5 <40 07/24/96 3829 -2653 <50 <0 5 <0 5 <0 5 <0 5 <5 0 10/23/96 4018 -2842 <50 <0 5 <05 <0 5 <0 5 <5 0 01/20/97 3617 -2441 <50 <0 5 <05 <0 5 <0 5 <5 0 07/16197 3384 -2208 <50 <0 5 <05 <15 <0 5 <5 0 10/15/97 1575 -2399 <50 <0 5 <0 5 <0 5 <05 <5 01<2 0' i 12/08/97 3578 -2402 -- - -- -- -- - 03/05/98 3080 -1904 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0" 05/27/98 2767 -1591 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0� 07/21/98 2791 -16 15 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 0° 10/14/98 2899 -1723 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 0' 01/25-26/99 2822 -1646 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0' 04/19-20/99 2573 -1197 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0� 07115-16199 2713 -1537 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0' 11 76 10125-26199 2882 -1706 <.50 <0 50 <0 50 <0 50 <0150 <2 5/<2 OF til 6981 XIA 38 � As*l i/dl iI I