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Table 2 Groundwater Analytical Results-Oxygenate Compounds Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETBE TAME 1,2-DCA EDB (PPM) (ppb) (pp b) (ppb) (ppb) (ppb) (Ppb) (ppb) (ppb) MW-8 12/08/97 WELL PAVED OVER -- -- -- -- -- 03/05/98 -- <500 <100 <2 0 <2 0 <20 <20 -- - 05/27/98 -- <500 <100 <2 0 <20 <2 0 <20 07121/98 -- <500 <100 89 <20 <2 0 <20 -- - 10/14/98 - <500 <100 <2 0 <20 <2 0 <20 -- - 01/25-26199 -- <500 <100 <20 <2 0 <2 0 1<20 - 04/191-20199 -- <500 <100 78 <2 0 <2 0 <2 0 - -- 07/15-16199 -- -- <100 3 1 <2 0 <2 0 <20 -- 10/25-26199 -- -- <100 <20 <2 0 <2 0 <20 - 01/27-28100 -- -- <100 <20 <2 0 <2 0 <20 -- -- 06126-27100 -- -- <100 <2 00 <2 00 <2 00 <2 00 -- -- 09/22-23100 <1 00 <500 <50 <20 <2 0 <2 0 <20 <20 <2 0 12126-27/00 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 -- -- 03107-08101 - <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 <20 <20 <2 0 <20 09112-13/01 -- <1,000 <100 <20 <2 0 <2 0 <2 0 <2 0 <2 0 12/12-13101 - <500 <20 <10 <10 <10 <10 <10 <10 03/20-21102 -- <500 <100 <20 <2 0 <2 0 <20 <2 0 <20 06106-07/02 -- <500 <100 <20 <2 0 <2 0 <20 <2 0 <20 09/30/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2'0 <2 0 MW-9 12/08/97 <1 0 <500 <100 <20 <2 0 <2 0 <2 0 -- -- ! 03/05/98 -- <500 <100 <2 0 <2 0 <20 <2 0 -- -- 05/27/98 -- <500 <100 <2 0 <2 0 <20 <2 0 -- -- 07/21/98 -- <500 <100 <2 0 <2 0 <20 <2 0 -- 10/14198 <500 <100 <2 0 <20 <2 0 <20 -- -- 01/25-26199 <500 <100 <2 0 <20 <2 0 <2 0 -- 04119/-20199 041191-20199 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- 07/15-16199 -- -- <100 <2 0 <2 0 <2 0 <2 0 - -- 10/25-26199 -- - <100 <2 0 <2 0 <20 <20 -- -- 01/27-28100 -- - <100 <2 0 <2 0 <20 <20 -- -- Si 6981 x10138 A&/30/02