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. Tab1 - Groundwater Analytical ResulWoxygenate Compounds Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIVE ETRE TAME 1,2-DCA EDB (PPm) (ppb) (Ppb) (Ppb) (ppb) (ppb) (ppb) (Ppb) (Ppb) MW-1 12/08/97 WELL PAVED OVER -- -- -- -- -- 03/05/98 -- <500 <100 20 <2 0 <2 0 <2 0 -- 05/27/98 -- <500 <100 30 <2 0 <2 0 <2 0 -- -- 07/21/98 -- 1,500 <100 27 <2 0 <2 0 <2 0 -- -- 10/14/98 - <500 <100 20 <2 0 <2 0 <2 0 01/25-26/99 -- <500 <100 53 <2 0 <2 0 <2 0 -- -- 04/19/-20/99 -- <500 <100 24 <2 0 <2 0 <2 0 - -- 07/15-16/99 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- -- 10/25-26/99 -- - <100 38 <2 0 <2 0 <2 0 - -- 01/27-28/00 - - <100 30 <20 <2 0 <20 - -- 06/26-27100 -- -- <100 <2 00 <2 00 <2 00 <2 00 -- -- 09/22-23/00 <1 00 <500 <50 <20 <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 06126-27101 -- <1,000 <100 <2 0 <20 <2 0 <2 0 <2 0 <20 MW2 12/08/97 20 <1,700 <330 390 <6 7 <6 7 <6 7 -- -- 03/05/98 -- <10,000 <2,000 300 <40 <40 <40 -- - 05/27/98 <10,000 <2,000 270 <40 <40 <40 -- - 07/21/98 - <500 <100 180 <2 0 <2 0 <2 0 -- -- 10/14/98 -- <2,500 <500 190 <10 <10 <10 -- - 01/25-26/99 -- <500 <100 170 <2 0 <2 0 <2 0 -- -- 04/19/-20/99 -- <1,000 <200 180 <4 0 <4 0 <4 0 -- -- 07/15-16/99 -- -- <t00 180 <2 0 <2 0 <2 0 -- - 10/25-26199 -- -- <500 200 <10 <10 <10 -- -- 01/27-28/00 -- -- <100 140 <2 0 <2 0 <2 0 - -- 06/26-27/00 -- -- <100 879 <2 00 <2 00 <2 00 -- -- 09122-23100 120 <500 <50 100 <2 0 <2 0 <20 <2 0 <2 0 12/26-27/00 -- <1,000 <100 785 <2 00 <2 00 <2 00 -- -- 03107-08/01 -- <1,000 <100 732 <2 00 <2 00 <2 00 <2 00 <2 00 06/26-27/01 -- <1,000 <100 47 <2 0 <2 0 <2 0 <2 0 <2 0 6981 xls/#180138 23 As of 06/27/01