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Ta 2 Groundwater Analytical R*-Oxygenate Compounds Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOIL TBA MTBE DIPS ETRE TAME 1,2-DCA EDB ppm 1plib) (ppb) (ppb) (ppb (ppb) (Ppb) (ppb) {ppb) MW-11 12/08/97 WELL PAVED OVER -- -- -- -- -- -- -- 03/05/98 03/16/98 -- <2,500 <500 <10 <10 <10 <10 -- -- 05/27/98 -- <500 <100 17 <2 0 <2 0 <2 0 -- 07/21/98 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- - 10/I4198 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- 01/25-26199 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- - 04/19/-20/99 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- 07/15-16/99 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- -- 10/25-26/99 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- -- 01127-28/00 -- -- <100 40 <2 0 <2 0 <2 0 -- -- 06/26-27/00 -- -- <100 <2 00 <2 00 <2 00 <2 00 -- -- 09122-23/00 <1 00 <500 <50 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 12126-27100 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 -- -- 03/07-08101 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 <2 00 <2 00 06126-27/01 - <1,000 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 09/12-13/01 -- <1,000 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 12112-13101 -- <500 <20 <10 <10 <10 <10 <10 <10 03/20-21/02 <500 <100 <20 <2 0 <20 <20 <2 0 <2 0 MW-14 08/21/99 -- <500 <100 110 <2 0 <2 0 <2 0 -- -- 10/25-26199 -- -- <100 150 <2 0 <2 0 <20 11 <2 0 01127-28100 -- <100 170 <2 0 <2 0 <2 0 88 <2 0 06/26-27100 -- -- <200 346 <4 00 <4 00 <4 00 188 <4 00 09122-23100 <1 00 <500 <50 250 <2 0 <2 0 <20 10 <2 0 12126-27100 -- 4,670 <167 210 <3 34 <3 34 <3 34 684 <3 34 03/07-08101 -- <1,250 <125 198 <2 50 <2 50 <2 50 414 <2 50 06126-27101 -- <1,000 <100 120 <2 0 <2 0 <20 36 <20 09112-13101 -- <1,000 <100 61 <2 0 <2 0 <2 0 <2 0 <2 0 12112-13101 -- <500 <20 55 <10 <10 <10 <10 <10 03/20-21102 -- <500 <100 38 <2 0 <20 <20 <20 <20 6981 xls/#180138 29 As of 03/21/02