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Ta Groundwater Monitoring nd Analytical Results Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID/ DATE DTW ST GWE TPR-G B T E X MTBE �'OC'k(p) ) b s) (1�) �) (ppb) b) ( b) (Ppb) (ppb) mW-1 1 10121-22/92 -- 54 0-72 0 -- <50 <0 5 <0 5 <0 5 <0 5 -- 01/13/93 -- -- <50 <0 5 <0 5 <0 5 <0 5- 1123 04/26/93 5083 -3960 <50 <0 5 <0 5 <0 5 <0 5 -- 07/26/93 5200 -4077 <50 <0 5 <0 5 <05 <0 5 -- 10/20/93 5242 -41 19 <50 <0 5 <0 5 <0 5 <0 5 -- 01/17-18/94` 4980 -3857 340 71 47 19 84 -- 02/28/942 4865 -3742 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25-26194 4766 -3643 <50 <0 5 10 <05 1 3 -- 07/25-26194 5021 -3898 <50 <0 5 057 <0 5 12- 10/26-27/94 2-10/26-27/94 51 41 -4018 <50 <0 5 1 l <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 -- 10/25-26/95 4605 -3482 <50 <0 5 <0 5 <0 5 <0 5 -- 01124/96 43 12 -31 89 <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 X50 <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 -- -- -- -- -- 03/05/98' INACCESSIBLE -- -- -- -- -- -- 03/16/98 31 52 -2029 2401° 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 50 <2 5/<2 06 01125-26/99 2874 -1751 <50 <0 50 <0 50 <0 50 082 <2 5/<2 06 04/19-20/99 2646 -1523 <50 <0 50 <0 50 <0 50 <0 50 <2 51<20 6 07115-16199 2776 -1653 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 11 23 10125-26/99 2944 -18 21 <50 <0 50 <0 50 056 099 <2 5/<2 06 6981 xls/4180138 15 As of 06/26/03