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Tq&2 Groundwater Analytical R -Oxygenate Compounds • 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) (Ppb) (ppb) (Ppb) (ppb) (PPB) (ppb) (Ppb) 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 -- - 07/21/98 - <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/-20/99 - <500 <100 48 <2 0 <2 0 <2 0 - -- 07/15-16199 -- -- <100 46 <2 0 <2 0 <20 -- -- 10/25-26/99 -- <100 33 <20 <2 0 <2 0 - 01/27-28/00 - - <100 <2 0 <2 0 <2 0 <2 0 - -- 06/26-27100 -- -- <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 12126-27/00 -- <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 MW-5 12/08197 <1 0 <500 <100 43 <2 0 <2 0 <2 0 -- -- 03/05/98 -- <500 <100 18 <2 0 <2 0 <2 0 -- - 05/27/98 -- <500 <100 78 <2 0 <2 0 <2 0 - -- 07/21/98 - <500 <100 45 <2 0 <2 0 <2 0 -- -- 10/14/98 - <500 <100 29 <2 0 <2 0 <20 - - 01125-26199 -- <500 <100 42 <2 0 <20 <2 0 -- - 04/19/-20199 -- <500 <100 22 <2 0 <2 0 <2 0 - - 07/15-16/99 - -- <100 36 <2 0 <2 0 <2 0 - -- 10/25-26199 -- -- <100 13 <2 0 <2 0 <2 0 -- - 01/27-28/00 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- - 06126-27/00 -- -- <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 12/26-27100 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 -- -- 03/07-08/41 -- <1,000 <100 238 <2 00 <2 00 <2 00 <2 00 <2 00 6981 xis/#180138 23 As of 03/08/01