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T* • . <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 DiPE ETBE TAME <br /> (ppb) Pb) (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 <20 <20 <br /> 07/21/98 1,500 <100 27 <2 0 <20 <20 <br /> 10/14/98 -- <500 <100 20 <2 0 <20 <20 <br /> 01125-26199 -- <500 <100 53 <20 <20 <20 <br /> 04/19/-20199 -- <500 <100 24 <20 <2 0 <20 <br /> MW-2 12/08/97 20 <1,700 <330 390 <6 7 <6 7 <67 <br /> 03/05198 -- <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 /> 01125-26199 -- <500 <100 170 <2 0 <20 <20 <br /> 041191-20199 — <1,000 <200 180 <40 <40 <40 <br /> MW4 12/08/97 <1 0 <500 <100 75 <20 <20 <20 <br /> 03/05/98 -- <2,500 <500 34 <10 <10 <10 <br /> 05/27/98 -- <500 <100 32 <20 <20 <20 <br /> 07/21/98 -- <500 <100 18 <2 0 <20 <20 <br /> 10/14/98 -- <500 <100 10 <20 <20 <20 <br /> 01125-26199 - <500 <100 10 <20 <20 <20 <br /> 041191-20199 -- <500 <100 48 <2 0 <20 <20 <br /> MW-5 12/08/97 <1 0 <500 <100 43 <20 <20 <20 <br /> 03/05/98 -- <500 <100 18 <20 <20 <20 <br /> 05/27/98 -- <500 <100 7 8 <20 <20 <2 0 <br /> 07/21/98 -- <500 <100 45 <20 <20 <20 <br /> 10/14/98 - <500 <100 2 9 <20 <2 0 <20 <br /> 01125-26199 -- <500 <100 42 <20 <20 <20 <br /> 041191-20199 -- <500 <100 22 <20 <2 0 <20 <br /> 6981 x1s1#I80138 1 As of 04/20/99 <br />