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Tal <br /> Groundwater Analytical Results -Oxygenate Compounds <br /> Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Well ID Date Methanol Ethanol TBA MTBE [HPE ETBE TAME <br /> (Ppb) (Ppb) (ppb) (ppb) (Ppb) (Ppb) (Ppb) <br /> MW-11 12/08/97 WELL PAVED OVER - - - - - <br /> 03/05/98 -- -- -- -- -- -- -- <br /> 03/16/98 -- <2,500 <500 <10 <10 <10 <10 <br /> 05/27/98 -- <500 <100 17 <20 <2 0 <2 0 <br /> 07/21/98 -- <500 <100 <20 <2 0 <2 0 <2 0 <br /> 10/14198 -- <500 <100 <20 <2 0 <2 0 <2 0 <br /> 01125-26/99 -- <500 <100 <2 0 <20 <2 0 <20 <br /> 041191-20199 — <500 <100 <20 <20 <20 <20 <br /> VW-1 12/08/97 <1 0 <500 <100 <20 <2 0 <20 <2 0 <br /> 03/05/98 -- <500 <100 <20 <20 <20 <20 <br /> 05/27/98 -- <500 <100 <20 <2 0 <20 <20 <br /> 07/21/98 -- <500 <100 <20 <2 0 <20 <20 <br /> 10/14/98 -- <500 <100 <20 <20 <20 <2 0 <br /> 01125-26199 -- <500 <100 25 <2 0 <20 <2 0 <br /> 041191-20199 -- <500 <100 30 <20 <20 <2 0 <br /> VW-2 04/19/-20199 -- <500 <100 49 <20 <2 0 <2 0 <br /> VW-3 12/08/97 <1 0 <500 <100 <20 <2 0 <20 <20 <br /> 03/05/98 -- <1 200 <250 300 <5 0 <50 <50 <br /> 05/27/98 -- <500 <100 <20 <2 0 <20 <20 <br /> 07/21/98 -- <500 <100 <20 <2 0 <20 <20 <br /> 10/14/98 -- <500 <100 <20 <20 <20 <20 <br /> 01/25-26/99 -- <500 <100 1,300 <20 <20 <20 <br /> 041191-20/99 <5,000 <1,000 890 <20 <20 <20 <br /> VW4 12/08/97 WELL CONNECTED TO VES -- -- -- -- -- <br /> 03/05/98 -- <500 <100 39 <20 <20 <20 <br /> 05127/98 - <1,250 <250 <5 0 <50 <5 0 <50 <br /> 07!21198 -- <500 170 <20 <20 <2 0 <2 0 <br /> 10/14/98 -- <16,500 <3,300 <66 <66 <66 <66 <br /> 6981 xlst#180138 3 As of 04/20/99 <br />