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Ta <br /> Groundwater Monitoring I3dta and Analytical Results a - <br /> Tosco (Former Unocal) Bulk Plant#0788 <br /> 8203 East IIth Street <br /> Tracy, California <br /> EXPLANATIONS- <br /> Groundwater monitoring data and laboratory analytical results prior to April 29, 1998, were compiled from reports prepared by MPDS Services, Inc. { <br /> TOC = Top of Casing B = Benzene ppb = Parts per billion <br /> DTW = Depth to Water T = Toluene ND = Not Detected <br /> (ft.) = Feet E = Ethylbenzene -- = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> ms] = 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 /> * TOC elevations have been surveyed relative to mean sea level (msl). <br /> I Laboratory reports atypical chromatograph pattern. <br /> 2 Petroleum hydrocarbons detected as TPH(D)appear to be heavier than diesel. <br /> 3 Petroleum hydrocarbons reported as TPH(D)appear to be lighter than diesel. <br /> 4 Petroleum hydrocarbons reported as TPH(D)appear to be due to a combination of heavier and lighter hydrocarbons. <br /> s Tested on May 26, 1993 -All EPA Method 8270 target analytes were ND. <br /> 6 The concentrations reported as diesel for samples U-6, U-7, and U-8 are due to the presence of a combination of diesel and a discrete peak not indicative of diesel fuel. <br /> 7 Laboratory report indicates the hydrocarbons detected appeared to be a diesel and non-diesel mixture. <br /> a Laboratory report indicates the hydrocarbons detected did not appear to be diesel. <br /> 4 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline. <br /> to Laboratory report indicates unidentified hydrocarbons C9-C24. <br /> Depth to water and groundwater elevation history will be updated in future reports. <br /> 0788.xls1#180144 8 As of 12101199 <br />