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Table 1 Groundwater Monitoring Data and Analytical Results Tosca(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID/ DATE DTW S1 GWE TP'H-O B T E X MTBE TOC* (ft) (ft bgs) (msl) (ppb) (Ppb) (ppb) (ppb) (ppb) (Ppb) MW-6 04/16/92 - 49 0-69 0 - NOT SAMPLED -- -- -- -- 07/30/92 -- -- 4105 <05 <0 5 <0 5 <0 5 -- 10/21-22192 - -- 180 22 08 <0 5 <0 5 - 01/13/93 -- - 140 36 <0 5 06 10 - k 1143 04/26/93 5028 -3885 730 11 <2 5 88 64 - 07/26/93 51 33 -3990 150 <0 5 <0 5 07 <0 5 -- 10/20193 51 79 -4036 220 10 095 1 1 1 1 - 01117-18194 4929 -3786 570 36 094 91 24 -- 04/25-26194 4721 -3578 500 44 1 6 20 1 2 - 07/25-26194 4966 -3823 881 1 8 <0 5 <0 5 <0 5 -- 10/26-27/94 5082 -3939 <50 <0 5 069 <0 5 059 01/25-26195 4807 -3664 <50 <0 5 <0 5 <0 5 <0 5 -- 04/26-27195 4366 -3223 <50 <0 5 <0 5 <0 5 <0 5 -- 07/26/95 4463 -3320 <50 055 19 <0 5 23 - 10/25-26/95 4546 -3403 <50 <0 5 <0 5 <0 5 <0 5 - 01/24/96 4249 -3106 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25/96 3807 -2664 <50 <0 5 <0 5 <0 5 <0 5 <40 07/24/96 3840 -2697 <50 <0 5 <05 <0 5 <0 5 <5 0 10/23/96 4011 -2968 <50 <05 <0 5 <0 5 <0 5 <5 0 01/20/97 3668 -2525 <50 <0 5 <0 5 <0 5 <0 5 <5 0 07/16/97 1403 -2260 <50 <0 5 <0 5 <0 5 <0 5 <5 0 10/16/97 3579 -2436 <50 <0 5 <0 5 <0 5 <0 51 <5 0/<2 06 12/08/97 3565 -2422 -- -- -- -- 03/05/98 3162 -2019 <50 <0 50 <0 50 <0 50 <0 50 4 4/<2 0 05/27/98 28 19 -1676 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/21/98 2817 -1674 <50 <0 50 070 <0 50 0 70, <5 0/<2 06 10/14/98 2913 -1770 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 e 01125-26/99 2922 -1679 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 04/19-20199 2592 -1449 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 07/15-16199 2720 -1577 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 1143 10125-26199 2883 -1740 <50 <0 50 <0 50 <0 50 074 <2 5/276 6981 xls/Af8 S• As 007101