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Table 2 Groundwater Analytical R -Oxygenate Compounds 0 Former Tosco(Unocal Service Station#6981 4707 Pacific Avenue _ Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETBE TAME 1,2-DCA EAB ( f) (ppb) (ppb) (ppb) (ppb) (Ppb) (ppb) (ppb) (ppb) 06/26-27/01 -- <25,000 <2,500 <50 <50 <50 <50 <50 <50 09112-13101 -- <25,000 <2,500 <50 <50 <50 <50 <50 <50 12/12-13/01 -- <17,000 <670 <33 <33 <33 <33 <33 <33 03/20-21/02 -- <10,000 <2,000 <40 <40 <40 <40 <40 <40 i 06/06-07/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 09/30/02 -- <25,000 <5,000 <100 <100 <100 <100 <100 <100 12/30-31/02 <25,000 <5,000 <100 <100 <100 <100 <100 <100 03/29-30103 -- <100,000 <20,000 <400 <400 <400 <400 <400 <400 06125-26/03 -- <5,000z <1,000 <20 <20 <20 <20 <20 <20 PTW-1 01125-26199 -- <500 <100 84 <2 0 <2 0 <2 0 -- -- 04/19/-20/99 - <500 <100 34 <2 0 <2 0 <2 0 -- 07/15-16199 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- - 10/25-26/99 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- 01/27-28/00 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- - 06/26-27/00 -- -- <100 457 <2 00 <2 00 <2 00 -- -- 09/22-23/00 <1 00 <500 <50 <2 0 <2 0 <2 0 <2 0 46 <2 0 12126-27/00 -- <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 06/26-27/01 -- <1,000 <100 18 <2 0 <2 0 <2 0 41 <2 0 09/12-13101 -- <1,000 <100 20 <2 0 <2 0 <2 0 57 <2 0 12112-13/01 -- <500 <20 75 <1 0 <1 0 <1 0 49 <1 0 03/20-21/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 06106-07102 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 09/30/02 -- <500 <100 36 <2 0 <2 0 <2 0 <2 0 <2 0 12/30-31/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 03/29-30/03 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 06125-26/03 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 6981 xls/##180138 13 As of 06/26/03