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• *able 1 Groundwater Monitoring Data and Analytical Results Tosco (Former Unocal) Bulk Plant#0788 8203 East 11th Street Tracy, California Groundwater monitoring data and laboratory analytical results prior to April 29, 1998, were compiled from reports prepared by MPDS Services, Inc. TOC = Top of Casing B = Benzene ppb = Parts per billion DTW = Depth to Water T = Toluene ND = Not Detected (ft.) = Feet E = Ethylbenzene -- — Not MeasuredlNot Analyzed I GWE = Groundwater Elevation X = Xylenes msi = Relative to mean sea level MTBE = Methyl tertiary butyl ether TPH(D) = Total Petroleum Hydrocarbons as Diesel TPH(G) = Total Petroleum Hydrocarbons as Gasoline 4 * TOC elevations have been surveyed relative to mean sea level(msl). Prior to November 30, 1993, DTW measurements were taken from the top of well covers. I Laboratory reports atypical chromatograph pattern. Z Petroleum hydrocarbons detected as TPH(D)appear to be heavier than diesel. 3 Petroleum hydrocarbons reported as TPH(D)appear to be lighter than diesel. Petroleum hydrocarbons reported as TPH(D)appear to be due to a combination of heavier and lighter hydrocarbons. 5 Tested on May 26, 1993-All EPA Method 8270 target analytes were ND. 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. 7 Laboratory report indicates the hydrocarbons detected appeared to be a diesel and non-diesel mixture. a Laboratory report indicates the hydrocarbons detected did not appear to be diesel. I 9 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline. to laboratory report indicates unidentified hydrocarbons C9-C24. I I Sample container was inadvertently broken in transit. 12 Laboratory report indicates unidentified hydrocarbons >C16 and discrete peaks. 13 Laboratory report indicates unidentified hydrocarbons >C 16. I 0788.xis//l180144 9 As of 11/08/99