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Tab/ 1 Groundwater Monitoring and Analytical Results Former Tosco(Unocal) ervice Station#6981 4707 Pacific Avenue Stockton,California WELL IDI DATE DTW sl GWE TPH-G B T E X MTB1, TOC*O) ) ffitbgs) ( b) (ppb) (P b) (pp b) !&b) (pp b) mW-11 10/21-22/92 -- 54 0-72 0 -- <50 <05 <05 <05 <05 01/13/93 -- "" <50 <0 5 <0 5 <0 5 ! <0 5 = -- -39 60 <50 <0 5 1 1 23 04/26/93 50 83 <0 5 <0 5 -" 07/26193 5200 -4077 <50 <0 5 <0 5 10/20/93 5242 -41 19 <50 <0 5 <0 5 <0 5 <0 5 -- � $4 -- 01/17-181942 4980 -3857 340 7 1 47 19 02/28/942 4865 -3742 <50 <0 5 <0 5 <0 5 <0 5 -- 04/25-26/94 4766 -36 43 <50 <0 5 1 0 <0 5 1 3 -- 07/25-26/94 5021 -3898 <50 <0 5 057 <05 l 2 - 10/26-27/94 5141 -40 18 <50 <0 5 l 1 <0 5 i 1 2 01/25-26/95 4857 -3734 <50 <0 5 064 <0 5 089 -- 04126-27/95 4423 -3300 <50 <0 5 <0 5 <0 5 i <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 01/24/96 43 12 -31 89 <50 <0 5 <0 5 <0 5 i <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 LINABLE TO LOCATE WELL-PAVED OVER -- -- - - ; -- -- 03105/988 INACCESSIBLE -- -- "- ! -- 03/16/98 31 52 -2029 24010 97 16 23 12 3 21<106 05/27/98 2894 -1771 230 13 17 44 16 851176 07/21/98 28 85 -1762 <50 <0 50 = <0 50 <0 50 1 <0 50 <5 01<2 06 10!{4198 2982 -1859 <50 <0 50 <0 50 <0 50 ; <0 50 <2 5/<2 06 01/25-26/99 2874 -1751 <50 <0 50 <0 50 <0 50 ' 082 <2 51<2 06 04119-20/99 2646 -1523 <50 <0 SO <0 50 <0 50 <0 50 <2 5/<2 06 07/15-16199 2776 -16 53 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 11 23 10/25-26/99 2944 -18 21 <50 ' <0 50 <0 50 056 099 <2 5/Q 0 i i 6981 xls/4180138 15 I As of 06/26/03