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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IW DATE DTW S.I. GWJR TPH(G) B T E X MTBE TOC* (ft�) bgs) { ) (PPbI (PPb1 CPP�1 lPl�bl (PPS) (ppb) I MW-11 01/17-18/942 4980 54 0-72 0 -3857 340 71 47 19 84 -- (cont) 02/28/942 4865 -3742 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25-26/94 4766 -3643 <50 <0 5 10 <0 5 13 -- 07/25-26194 5021 -3898 <50 <0 5 057 <0 5 12 -- 10/26-27194 5141 4018 <50 <0 5 1 1 <0 5 12 -- 01/25-26195 4857 -3734 <50 <0 5 064 <0 5 089 -- 04/26-27/95 4423 -3300 <50 <0 5 <0 5 <0 5 <0 5 -- 07/26/95 4524 -3401 <50 091 27 <0 5 27 -- 10/25-26195 4605 -3482 <50 <0 5 <0 5 <0 5 <0 5 -- 01/24/96 43 12 -3189 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25/96 3855 -2732 <50 <0 5 <0 5 <0 5 <0 5 <40 07/24/96 3891 -2768 <50 <0 5 <0 5 <0 5 <0 5 <5 0 10/23/96 4064 -2941 <50 <0 5 <0 5 <0 5 <0 5 <5 0 01/20/97 37 18 -2595 <50 <0 5 <0 5 <0 5 <0 5 <5 0 07/16/97 UNABLE TO LOCATE WELL-PAVED OVER -- -- -- -- -- 10/15/97 UNABLE TO LOCATE WELL-PAVED OVER -- -- -- -- 12/08/97 UNABLE TO LOCATE WELL-PAVED OVER -- -- -- -- - 03/05/988 INACCESSIBLE -- -- -- -- -- -- -- 03/16/98 3152 -2029 24010 97 16 23 12 3 2/<106 05/27/98 2894 -1771 230 13 17 44 16 85/17 6 07/21/98 2885 -1762 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 06 10/14/98 2982 -1859 <50 <0 50 <0 50 <0 50 <0 SO <2 5/C2 06 01/25-26199 2874 -1751 <50 <0 50 <0 50 <0 50 082 <2 51<2 06 04/19-20199 2646 -1523 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/15-16/99 2776 -1653 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 1123 10125-26199 2944 -1821 <50 <0 50 <0 50 056 099 <2 5/<2 06 01/27-28/00 2883 -1760 <50 <0 50 <0 50 <0 50 <0 50 <2 5/4 Ob 06126-27100 2625 -1502 <50 0 <0 500 <0.500 <0.500 <0.500 <5 001<2.Oe MW-12 10/21-22192 -- 52 0-72 0 -- <50 <0 5 <0 5 <0 5 <0'5 -- 01/13/93 -- -- <50 <0 5 <0 5 <0 5 <0 5 1098 04/26/93 5084 -3986 <50 <0 5 <0 5 <0 5 <0 5 -- 07/26/93 5195 -4097 <0 5 <0 5 <0 5 <0 5 6981 x1 8 16 �, As*7106