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Groundwater Analytical Results - Oxygenate Compounds <br /> Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> WeU ID Date Methanol Ethanol TBA MTBE RIPE ETBE TAME <br /> (Ppb) (Ppb) (ppb) (Ppb) (Ppb) (ppb) (ppb) <br /> MW-1 12/08/97 WELL PAVED OVER -- -- -- -_ -- <br /> 03/05/98 -- <500 <100 20 <2 0 <20 <20 <br /> 05/27/98 -- <500 <100 30 <2 0 <2 0 <20 <br /> 07/21/98 -- 1,500 <100 27 <2 0 <20 <2 0 <br /> 10/14/98 — <500 <100 20 <20 <2 0 <2 0 <br /> MW-2 12/08/97 20 <1,700 <330 390 <67 <67 <67 <br /> 03/05/98 -- <10,000 <2,000 300 <40 <40 <40 <br /> 05/27/98 -- <10,000 <2,000 270 <40 <40 <40 <br /> 07/21/98 -- <500 <100 180 <2 0 <20 <20 <br /> 10/14/98 — <2,500 <500 190 <10 <10 <10 <br /> MW-4 12/08/97 <1 0 <500 <100 75 <2 0 <20 <2 0 <br /> 03/05/98 -- <2,500 <500 34 <l0 <10 <10 <br /> 05/27/98 -- <500 <100 32 <20 <20 <20 <br /> 07/2t/98 -- <500 <100 l8 <20 <20 <20 <br /> 10/14/98 -- <500 <100 10 <20 <2 0 <20 <br /> MW-5 12/08/97 <1 0 <500 <100 43 <2 0 <2 0 <20 <br /> 03/05/98 -- <500 <100 18 <2 0 <20 <20 <br /> 05/27/98 -- <500 <100 7 8 <20 <20 <20 <br /> 07/21/98 -- <500 <100 45 <20 <20 <20 <br /> 10/14/98 -- <500 <160 29 <20 <br /> <20 <20 <br /> MW-6 12/08/97 <1 0 <500 <100 <20 <2 0 <20 <2 0 <br /> 03/05/98 -- <500 <L00 44 <2 0 <20 <20 <br /> 05/27/98 -- <500 <100 <20 <20 <20 <20 <br /> 07/21/98 -- <500 <100 <20 <2 0 <20 <2 0 <br /> 10/14/98 -- <500 <100 <2 0 <2 0 <20 <20 <br /> 6981 xis/#180138 1 <br /> As of 10/14/98 <br />