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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID/ DATE DTW S.I. GWE TPH-G B T E X MTBE TOC*(ft) (ft) (ft bgs) (ft)- (ppb) (Ppb) (ppb) (ppb) (ppb) (ppb) I MW-1 03/05/98 3046 51 0-55 0 -2005 <50 <0 50 <0 50 <0 50 <0 50 <2 512 0" (cont) 05/27/98 2671 -1630 <50 I'S <0 50 <0 50 <0 50 12/30" 07/21/98 2677 -1636 57 22 098 <0 50 1 7 34127" 10/14198 2775 -1734 <50 <0 50 <0 50 <0 50 069 21/20 6 01/25-26/99 2704 -1663 <50 <0 50 <0 50 <0 50 <0 50 62153" 04/19-20199 2453 -1412 <50 <0 50 <0 50 <0 50 <0 50 25124" 07/15-16199 2581 -1540 <50 <0 50 <0 50 <0 50 <0 50 <2 512 0" 1041 10125-26/99 2740 -1699 <50 <0 50 <0 50 <0 50 076 5 11-38 6 01127-28100 2710 -1669 <50 <0 50 <0 50 <0 50 <0 50 <2 5/3 0" 06/26-27/00 2430 -1389 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 00" 1107 09/22-23/00 2748 -1641 2000 s <5 0 <5 0 <5 0 110 <25/<2 0" 12126-27100 2743 -1636 3791" <1 00 <1 00 <1 00 <1 00 <10 0/<2 0" 03/07-08101 2723 -1616 413" 228 <0 500 <0 500 <0 500 <5 00/<2 00" 06126-27101 2816 -1709 150" 053 <0 50 <0 50 <0 50 <5 0/<2 0" 09112-13101 3004 -1897 3101" 34 <0 50 <0 50 <0 50 <5 0/<2 0" 12112-13101 3037 -1930 2401" 13 <0 50 <0 50 <0 50 <5 01<l 0" 03120-21102 2918 -1811 160 if; 24 <0 50 <0 50 <0 50 <5 01<2 0" 06106-0710217 2959 -1852 <50 <0 50 079 <0 50 <1 0 --/<2 0" 09/30/0218 3207 -2100 <50 11 18 12 42 <2.0 MW-2 02/21/90 -- 51 0-55 0 -- 12,000 1,900 75 21 140 -- 10/18/90 DRY -- -- -- -- -- -- `- � 11/19/90 DRY -- -- -- -- -- -- -- 12/27/90 DRY -- -- "" 01/28/91 DRY -- -- - -- -- -- "" 04/02/91 DRY - - -- - -- F -- 07118/91 DRY - -- -- -- -- -- 09/30/91 DRY -- -- - -- -- -- -- 11/14/91 DRY -- - -- -- -- -- 04/16/92 DRY - -- - -- "- -- 07/30/92 DRY -- -- - - -- "" 6981 *41138 All/30102