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Table 1 Groundwater Monitoring Data and Analytical Results d Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California f WELL IDI DATE DTW S1 GWE TPH-G B T E X MTBE TOC-Cft) (A) (ft bgs) (ft) (PPh) (ppb) (ppb) (Ppb) (ppb) (ppb) MW-4 04/25/96 3824 51 0-55 0 -2661 (cont) 07/24/96 3815 -2692 <50 <0 5 <0 5 <0 5 <0 5 60 10/23/96 4030 -2867 SAMPLED SEMI-ANNUALLY 01120197 3679 -2516 <10 <0 5 <0 5 <0 5 <0 5 12 07/16/97 3418 -2255 <10 <0 5 <0 5 <0 5 <0 5 <5 0125E 10/15/97 3597 -2434 <10 <0 5 <0 5 <0 5 <0 5 <5 013 OE 12/08/97 3574 -2411 03/05/98 3171 -2008 1500 9 <5 0 61 59 220, 38134E 05/27/98 2829 -1666 <50 33 <0 50 <0 50 <0 50 27132E 07/21/98 2831 _1668 <50 <0 50 18 <0 50 2 3 I 18118E 10/14/98 2926 -1763 <50 <0 50 <0 50 <0 50 <0 50 14110E 01125-26199 2847 -1684 <50 <0 50 <0 50 <0 50 <0 50 95/10, 04/19-20199 2606 -1443 <50 <0 50 <0 50 <0 50 <0 50 62/486 07115-16/99 2736 -1573 <50 <0 50 <0 50 <0 50 <0 50 12/4 6E 1161 10125-26199 2900 -1737 <50 <0 50 071 <0 50 23 12133" 01/27-28100 2851 -1688 <50 <0 50 066 <0 50 <0 50 <2 51<2 OE 06/26-27/00 2574 44 11 <50 0 <0 500 180 <0 500 154, <5 001<2 00" 1161 09122-23100 28 14 -1651 <50 <0 50 10 <0 50 099 <2 5/<2 0" 12126-27/00 28 19 -1656 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 00" 03/07-08101 2793 -1630 <50 0 <0 500 <0 500 <0 500 <0 500 <5 001<2 00' 06126-27101 2888 -1725 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 OE 09112-13/01 3078 -1915 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 OE 12112-13/01 3105 -1942 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<1 OE I 03120-21/02 2986 -1823 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 OE 06106-07102 f 7 3027 -1864 <50 <0 50 22 <0 50 22 _4<2 0E 09/30/0218 3278 -2115 <SO 079 17 088 4 3 F <20 MW-5 02/21/90 -- 50 0-510 -- 1,600 77 16 05 17 ° -- 10l18/90 DRY - 11/19/90 DRY -- -- -- -' " -" 12/27/90 DRY 6981 XIS1138 A 30/02