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• Tap, • <br /> Gtoundiiatei Nlonttottng U,tta and Uali tical Results <br /> Tosco (Unocal) Ser%tce Station#5421 <br /> 7303 Pacific Avenue <br /> Stockton California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and labotatory analytical results prior to June 22 1998 were piovided by MPDS Sei vices Inc <br /> TOC = Top of Casing B = Benzene ppb = Parts per billion <br /> DTW = Depth to Water T = Toluene ND = Not Dltc.cted <br /> (ft) = Feet E = Ethylbenzene = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> msl = Relative to mean sea level MTBE = Methyl tertiary butyl ether <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> * TQC elevations have been surveyed relative to mean sea level (msl) <br /> t The analytical results of the groundwater sample from well MW-4 were inconsistent with the previous analytical results for this well Therefore,MPDS Services, Inc <br /> resampled monitoring well MW-4 on July 22, 1994 <br /> 2 MTBE by EPA Method 8260 <br /> Depth to water and groundwater elevation history will be updated to future reports <br /> 5421 xlsl#180139 4 As of 06122/98 <br />