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Table 1 Groundwater Monitoring Data and Analytical Results Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL IDI DATE DTW SI GWE TPH•G B T E X MTBE TOC' (ft) (A bgs) (msl) (ppb) (ppb) (ppb) (Ppb) (Ppb) (ppb) u MW-11 07/24/96 3891 54 0-72 0 -2768 <50 <0 5 <0 5 <0 5 <0 5 <5 0 (cont) 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 -- -- -" -" - 03l05198' INACCESSIBLE -- -- -- -- -- -- - 03/16/98 3152 -2029 24010 97 16 23 12 3 2/<10�' 05/27/98 2894 -1771 230 13 17 44 16 8 5/176 07/21/98 2885 -1762 <50 <0 50 <0 50 <0 50 <0 50 <5 01<2 06 10/14/98 2992 -1859 <50 <0 50 <0 50 <0 50 <0 50' <2 5/<2(� 01125-26199 2874 -1751 <50 <0 50 <0 50 <0 50 082 ,; <2 5/<2 06 04119-20199 2646 -1523 <50 <0 50 <0 50 <0 50 <0 50, <2 5/<2 06 07115-16199 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 01127-28100 2883 -1760 <50 <0 50 <0 50 <0 50 <0 50 <2 514 06 06126-27100 2625 -1502 <50 0 <0 500 <0 500 , <0 500 <0 500 <5 001<2 006 1123 09122-23100 2876 -1753 <50 <0 50 1 3 <0 50 14 <2 51<2 06 12126-27100 2858 -1735 <50 0 <0 500 <0 500 <0 500 <0 500 <5 001<2 00 03107-08101 2825 -1702 <50 0 <0 500 187 <0 500 1 56 <5 001<2 006 06126-27101 2927 -1804 <50 <0 50 <0 50 <0 50 <0 50 <5 0/<2 06 i MW-12 10121-22192 -- 52 0-72 0 -- <50 <0 5 <0 5 <0 5 <0 5 -- 01/13l93 -- -- <50 <0 5 <0 5 <0 5 <0 5, 1098 04/26/93 5084 -3986 <50 <0 5 <0 5 <0 5 <0 5�1 -- 07/26/93 5195 -4097 <50 <0 5 <0 5 <0 5 <0 5'1 -- 10/20/93 5246 -4148 <50 <0 5 <0 5 <0 5 <0 5 y i -- 01/17-18/942 4993 -3885 420 88 55 24 100 -- 02/28/942 4866 -3768 <50 <0 5 <0 5 <0 5 1 6 -- 04/25-26/94 4764 -3666 <50 <0 5 089 <0 5 1 2 - 07125-26/94 5019 -3921 <50 <0 5 052 <0 5 097 -- 6981 xlsl#181 38 140 As'07/01