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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California i WELL ID/ DATE DTW sl GWE TPH-G B T 1~ X MTBE TO *( j t} (ft b s) 61%) b) (ppb) b) (Ppb) ) h) Cft MW-5 01/20/97 36 82 500-550 -2506 <50 <0 5 <0 5 <0 5 it <0 5 25 i -22 56 <SQ <0 5 <0 5 <Q 5 <0 5 l� 34 (cont) 07/16/97 3432 5 10/15/97 36 18 -2442 <50 <0 5 <05 <0 -- f fi -- 12/08/97 3605 -2429 -- -- 03/05/98 3166 -1990 <50 <0 50 <0 50 <0 50 <0 50 231186 05/27/98 2828 -1652 <50 <0 50 <0 50 <0 sa <0 50 f 8 117 86 07/21/98 28 40 -i6 64 <50 <0 50 2 0 <0 50 2 1' 5 0/4 56 6 012 96 10/14/98 2942 -1766 <50 <0 50 <0 50 <0 50 <0 50 f 01125-26199 2856 -1680 <50 <0 50 <0 50 <0 50 <0 50 �I 35/426 5/4 2 6 04119-20199 26 1 I -14 35 <50 <0 50 <0 50 <0 50 <0 50 28/22 6 07/15-16/99 2751 -1575 <50 <0 50 <0 50 <0 50 <0 50 <2 513 66 l 1176 10/25-26/99 29 17 -1741 <50 <0 50 <0 50 <0 50 <0 50 <2 51136 01/27-28/00 2870 -1694 <50 072 078 <0 50 1 0 <2 5l<2 06 06/26-27/00 25 90 -14 14 <50 0 <0 500 4 42 <0 500 3 14 <5 001<2 006 1152 09122-23/00 2822 -1670 <50 074 060 <0 50 <0 50 <2 5/<2 06 12/26-27100 2816 -1664 <50 0 1 14 <0 500 <0 500 <0 500 <5 001<2 006 <0 500 <0 500 <0 1 <5 0012 386 03107-08/a1 27 8$ -16 36 <50 0 1 00 � '500� + <5 01<2 06 <50 <0 50 <0 50 0 06l2b-27101 28 85 -17 33 <0 50 <0 50 09112-13101 3078 -1926 <50 <0 50 95 <0 50 <0 5 <5 01<2 06 12/12-13/01 31 06 -1954 <50 <0 50 <0 50 <0 50 <0 50 <5 01<1 06 03/20-21102 2977 -1825 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 06 06/06-07102' 3025 -1873 <50 <0 50 24 <0 50 234<2--1<2 06 09/30/0218 3280 -2128 <50 20 25 16 52 til <2 0 12/30-31/0218 3234 -2082 <50 062 067 <0 50 <1 0 <2 0 03/29-3010315 31 25 -1973 <50 <0 50 <0 50 <0 50 <1 0 <2 0 06/25-26103 '-2017 <50 <0 50 <0 50 <0 50 <1 0 <2 0 09124-251031° 3401 -2249 <50 <0 50 056 <0 50 <10 <2 0 1 i � I 4 i4 6981 x118138 A1/25/03