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*able 1 • <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station#5886 <br /> 2701 West March Lane <br /> Stockton, California <br /> EXPLANATIONS, <br /> Groundwater monitoring data and laboratory analytical results prior to March 25, 1998, were compiled from reports prepared by MPDS Services, Inc <br /> TOC = Top of Casing elevation B = Benzene ppb = Parts per billion <br /> DTW = Depth to Water T = Toluene -- = Not Measured/Not Analyzed <br /> (ft) = Feet E = Ethylbenzene ND = Not Detected <br /> GWE = Groundwater Elevation X = Xylenes <br /> msl = Relative to mean sea level MTBE = Methyl tertiary butyl ether <br /> TPH(D) = Total Petroleum Hydrocarbons as Diesel <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> # The TOC elevations were surveyed relative to Mean Sea bevel(msl) These well casing elevations were used prior to the May 2, 1997 monitoring event <br /> The TOC elevations of the well casings were resurveyed(except for wells MW-2 and MW-3) relative to msl on April 28, 1997 The well casing elevations are used <br /> beginning with the May 2, 1997 The new TQC elevations for wells MW-2 and MW-3 were calculated by using the previously surveyed <br /> elevations for wells MW-1, MW-2 and MW-3 (MW-L = -0 84 feet msi. MW-2=-0 30 feet msl, and MW-3= -0 14 feet msl)and the resurveyed <br /> elevation of well MW-1 (=-1 35 feet ms]) <br /> 1 Laboratory report indicates unidentified hydrocarbons unidentified hydrocarbons >C14 <br /> Y Laboratory report indicates unidentified hydrocarbons unidentified hydrocarbons >C15 <br /> 3 Laboratory report indicates unidentified hydrocarbons diesel and unidentified hydrocarbons >C20 <br /> 4 laboratory report indicates the hydrocarbons detected did not appear to be diesel <br /> S Laboratory report indicates the hydrocarbons detected appeared to be a diesel non-diesel mixture <br /> 6 <br /> TPH(D)analysis with silica gel cleanup <br /> 7 MTBE by EPA Method 8260 <br /> s Detection limit raised Refer to analytical results <br /> 9 Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> 10 Laboratory report indicates unidentified hydrocarbons C9-C24 and Discrete peak @C24 <br /> Note Wells designated as "S" are screened in the shallow zone,and wells designated as "D" are screened in the deep zone <br /> 5886 xW#180137 5 As of 12/03198 <br />