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Ta .Groundwater Monitoring and Analytical Results r <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to March 6, 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 ND=Not Detected <br /> (ft)=Feet E=Ethylbenzene --=Not Measured/Not Analyzed <br /> GWE=Groundwater Elevation X=Xylenes D = Duplicate <br /> msl=Relative to mean sea level MTBE=Methyl tertiary butyl ether EB = Equipment Blank <br /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations have been surveyed relative to mean sea level On February 10, 1999,TOC measurements were re-surveyed relative to City of Stockton BM#24,msl <br /> i Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> 2 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> 3 Detection limit raised Refer to analytical reports <br /> 4 MTBE by EPA Method 8260 <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 6 Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only <br /> S Laboratory report indicates gasoline and unidentified hydrocarbons C6-Cl2 <br /> 9 Laboratory report indicates discrete peaks <br /> 10 Laboratory report indicates gasoline C6-C12 <br /> ANALYTICAL METHODS- <br /> EPA Method 8015 for TPH(G) <br /> EPA Method 8020 for BTEX and MTBE except where noted <br /> EPA Method 8260 for MTBE where noted <br /> 2859 xls/#280054 13 As of 06/01/00 <br />