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Table 1 Groundwater Monitoring Data and Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IDI DATE DTW S1 GWE TPR G B T E X MTBE TOC*(/t) (jt} (jt bgs) (ft) /Ppb) (ppb) (ppb) (ppb) (Ppb) (PPb) MW-11 10/25-26195 4605 54 0-72 0 -3482 <50 <0 5 <05 <0 5 <0 5 - (cont) 01/24196 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 3718 -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 2400 97 16 23 12 3 2/<106 I 05/27/98 2894 -1771 230 13 17 44 16 85/176 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 1<050 <2 5/<2 06 01/25-26/99 2874 -1751 <50 <0 50 <0 50 <0 50 082 <2 5/<2 06 04119-20/99 2646 -1523 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 07115-16/99 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 01127-28/00 2983 -1760 <50 <0 50 <0 50 <0 50 <0 50 <2 5/4 06 06126-27100 2625 -1502 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 006 1123 09122-23/00 2876 -1753 <50 <0 50 1 3 <0 50 14 <2 51<2 06 12126-27/00 2858 -1735 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 006 03107-08101 2825 -1702 <50 0 <0 500 187 <0 500 156 <5 00/<2 006 06126-27/01 2927 -1804 <50 <0 50 <0 50 <0 50 <0 50 <5 01<2 06 09112-13101 3121 -1998 <50 <0.50 49 <0 50 <0 50 <5 01<2 06 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 <05 -- 07/26/93 5195 -4097 <50 <0 5 <0 5 <0 5 <05 - 10/20/93 5246 -4148 <50 <0 5 <05 <0 5 <0 5 -- 6981 xls!# 38 As*13/01 x