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i <br /> • Tabo 0 <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 <br /> DTW = Depth to Water T = Toluene ppb = Parts per billion <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(D) = Total Petroleum Hydrocarbons as Diesel <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline <br /> The TOC elevations were surveyed relative to Mean Sea Level(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 TOC 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-I = -0 84 feet msl, MW-2=-0 30 feet msl,and MW-3 W -0 14 feet ms1)and the resurveyed <br /> elevation of well MW-I (=-I 35 feet msl) <br /> i Unidentified hydrocarbons >C14 <br /> 2 Unidentified hydrocarbons >C15 <br /> Diesel and unidentified hydrocarbons >C20 <br /> 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 TPH(D)analysis with silica gel cleanup <br /> 7 MTBE by EPA Method 8260 <br /> I� <br /> Note Wells designated as S are screened in the shallow zone,and wells designated as D are screened in the deep zone <br /> i <br /> 5886 xls/N180137 4 As of 03/25/98 <br />