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Ta .Groundwater Monitoring And Analytical Results I Fortner Unocal Service Station#15098 I 5606 Pacific Avenue Stockton, California reprepared ' Groundwater monitoring data and laboratory analytical results prior to September 15, 1498, were compiled from reports 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 Measured/Not Analyzed GWE = Groundwater Elevation X = Xylenes msl = Relative to mean sea level MTBE = Methyl tertiary butyl ether TPH(G) = Total Petroleum Hydrocarbons as Gasoline 1,2-DCE = 1,2-Dichloroethene * TOC elevations have been surveyed relative to mean sea level(msl)per the City of Stockton Benchmark No 14(Elevation = 10 95 feet msl) Prior to June 28, 1993, the DTW measurements were taken from the top of well covers ' Well has been destroyed 2 Nitrates were ND, and coliform bacteria were below detection limits 3 All EPA Method 8010 constituents were ND,except for concentrations of bromodichloromethane at 0 53 ppb, chloroform at 14 ppb, and dibromochloromethane at 0 97 ppb Laboratory has potentially identified the presence of MTBE at reportable levels to the groundwater sample collected from this well s Laboratory has identified the presence of MTBE at a level above or equal to the taste and odor threshold of 40 ppb in the sample collected from this well b Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture 7 MTBE by EPA Method 8260 8 Detection limit raised Refer to analytical reports 9 Ail EPA Method 8010 constituents were ND 10 Laboratory report indicates unidentified hydrocarbons C6-C8 11 Sampled by Environmental Audit, Inc S2 Laboratory report indicates gasoline C6-C12 13 Laboratory report indicates unidentified hydrocarbons C6-C12 14 Laboratory report indicates weathered gasoline C6-C12 5098 xis1/1280046 9 As of 12/13/94