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TaNW <br /> S Groundwater Monitoring W and Analytical Results `+ <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 B=Benzene EB=Equipment Blank <br /> (ft)=Feet T=Toluene (ppb)=Parts per billion <br /> DTW=Depth to Water E=Ethylbenzene ND=Not Detected <br /> GWE=Groundwater Elevation X=Xylenes (D)=Duplicate <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether --=Not Measured(Not Analyzed <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 /> ' Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> z Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> I Detection limit raised Refer to analytical reports <br /> MTBE by EPA Method 8260 <br /> 5 Laboratory report indicates unidentified hydrocarbons C6-CI2 <br /> 5 Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 7 Well development only <br /> s Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> 9 Laboratory report indicates discrete peaks <br /> 16 Laboratory report indicates gasoline C6-C 12 <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(except where noted) <br /> 2859 xls/#280054 15 As of 02/08/01 <br />