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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 S1 GWE TPI3`0 B T E X MTBE TOC*(ft) 00 (ft h99 00 (Ppb) (ppb) (Ppb) (ppb) (ppb) ppb) MW-11 07/26/93 5200 54 0-72 0 -4077 <50 <0 5 <0 5 <0 5 <0 5 -- (cont) 10/20/93 5242 -41 19 <50 <0 5 <0 5 <0 5 <0 5 -- 01117-18/942 4980 -3857 340 7 1 47 19 84 _- 02/28/942 486.5 -3742 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25-26/94 4766 -3643 <50 <0 5 10 <0 5 1113 07/25-26/94 5021 -3898 <50 <0 5 057 <0 5 1 2 -- 10/26-27194 5141 -4018 <50 <0 5 1 1 <0 5 12 01/25-26/95 4857 -3734 <50 <05 064 <0 5 089 - 04/26-27/95 4423 -3300 <50 <0 5 <0 5 <0 5 <0 5 -- 07/26/95 4524 -1401 <50 091 27 <0 5 217 - 10/25-26195 460-5 -3482 <50 <0 5 <0 5 <0 5 <0 5 -- 01/24/96 4312 -1189 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25/96 38 55 -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 I OCATE WELL-PAVED OVER -- -- -- - -- 12/08/97 UNABLE TO LOCATE WELL-PAVED OVER - -- - -- -- 03105/98, INACCESSIBLE -- -- -- -- -- -- 03/16/98 31 52 -2029 24010 97 16 23 12 3 21<10' 05/27/98 2994 -1771 230 13 17 44 16 8 5/17 07/21/98 2885 -1762 <50 <0 50 <0 50 <0 50 <6,50 <5 0/<2 e 10/14/98 2982 -1859 <50 <0 50 <0 50 <0 50 <0,50 <2 5l<2 06 01/25-26/99 2874 -1751 <50 <0 50 <0 50 <0 50 082 <2 51<2 OE 04/19-20199 2646 -1523 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0' 07115-16/99 2776 -1653 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 0' 11 23 I0/25-26/99 2944 -1821 <50 <0 50 <0 50 056 099 <2 51<2 06 01/27-28100 2883 -1760 <50 <0 50 <0 50 <0 50 <01,50 <2 514 0's 06/26-27/00 2625 -1502 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 00, 1123 09/22-23/00 2876 -1753 <50 <0 50 13 <0 50 14 <2 51<2 0'1 12/26-27/00 28 58 -1735 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00/<2 00' �I 6981 z1 138 • 13101