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Ta <br /> Groundwater Momtormg and Analytical Results <br /> Tosco(Unocal)Service Station#5886 <br /> 2701 West March Lane <br /> Stockton,California <br /> EXPLANATIONS (cont) <br /> P; Instrument continuing calibration failed Since silica cleanup was requested on diesel hits,the sample was not rerun The results should be considered estimated values <br /> iR <br /> Laboratory report indicates MTBE reported from a second run dilution <br /> 17 Laboratory report indicates this sample was analyzed out the EPA recommended holding time <br /> is MTBE by EPA Method 8260 was originally analyzed within holding time Re-analysis for confirmation or dilution was performed past the recommended holding time <br /> 19 Laboratory report indicates the result reported was generated out of hold time The sample was originally run within hold time but needed to be re-analyzed <br /> Note Wells designated as S' are screened in the shallow zone,wells designated as'I' are screened in the intermediate zone,and wells designated as D"are <br /> screened in the deep zone <br /> 5886 xls/#180137 15 As of 05/08/01 <br />