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Table 2 Groundwater Analyticalis-Oxygenate Compounds Former Tosco(Unca Service Station#6981 4707 Pacific Avenue _ Stockton,California WELL ID DATE METHANOL ETHANOL, TBA MTBE DIPS ETRE TAME 1,1-DCA Ella (Pm) (PPb) (PPb) (PPb) (PPb) (PPb) (PPb) (ppb) (PP b) 07/15-16199 -- - <100 180 <2 0 <2 0 <2 0 - MW-2 10125-26/99 -- -- <500 200 <10 <10 <10 - - (cont) 01/27-28100 -- -- <100 140 <2 0 <2 0 <2 0 -- 06/26-27/00 -- -- <100 879 <2 00 <2 00 <2 00 -- -- 09/22-23/00 120 <500 <50 100 <2 0 <2 0 <2 0 <2 0 <2 0 12/26-27/00 -- <1,000 <100 785 <2 00 <2 00 <2 00 -- -- 03/07-08/01 -- <1,000 <100 732 <2 00 <2 00 <2 00 <2 00 <2 00 06126-27/01 -- <1,000 <100 47 <2 0 <2 0 <2 0 <2 0 <2 0 09/12-13101 -- <1,000 <100 62 <2 0 <2 0 <2 0 <2 0 <2 0 12112-13101 -- <500 <20 94 <10 <10 <10 <10 <10 03120-21/02 -- <500 <100 78 <2 0 <2 0 <2 0 <2 0 <2 0 06/06-07/02 -- <500 <100 58 <2 0 <2 0 <2 0 <2 0 <2 0 09/30/02 -- <10,000 <2,000 60 <40 <40 <40 <40 <40 12130-31/02 -- <2,500 <500 49 <10 <10 <10 <10 <10 03/29-30/03 -- <500 <100 31 <2 0 <2 0 <2 0 <2 0 <2 0 06125-26/03 -- <500 <100 19 <2 0 <2 0 <2 0 <2 0 <2 0 MW-4 12/08/97 <1 0 <500 <100 75 <2 0 <2 0 <2 0 -- -- 03/05/98 -- <2,500 <500 34 <10 <10 <10 -- -- 05/27/98 -- <500 <100 32 <2 0 <2 0 <2 0 -- - 07121198 -- <500 <100 18 <2 0 <2 0 <2 0 -- -- 10/14/98 -- <500 <100 10 <2 0 <2 0 <2 0 -- - 01/25-26/99 -- <500 <100 10 <2 0 <2 0 <2 0 -- _ 04/19/-20199 - <500 <100 48 <2 0 <2 0 <2 0 -- 07/15-16199 -- -- <100 46 <2 0 <2 0 <2 0 -- -- 10/25-26/99 -- -- <100 33 <2 0 <2 0 <2 0 -- -- 01/27-28100 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- -- 06/26-27/00 -- -- <100 <2 00 <2 00 <2 00 <2 00 -- -- 09/22-23/00 <1 00 <500 <50 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 12/26-27/00 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 -- -- 03/07-08/01 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 <2 00 <2 00 6981 xls/4180138 2 As of 06/26/03