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T el y <br /> isGroundwater Monitori to and Analytical Results <br /> Tosco(Circle )Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop,California - <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to January 25, 1999,were compiled from reports prepared by Pacific Environmental Group,inc <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> (ft)=Feet B=Benzene ND=Not Detected <br /> DTW=Depth to Water T=Toluene --=Not Measured[Not Analyzed <br /> S i =Screen Interval E=Ethylbenzene QA=Quality Assurance/Trip Blank <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> tertiary Methyl MTBE= butyl ether <br /> GWE=Groundwater Elevation Y rY tT <br /> i <br /> j + TOC elevations have been surveyed relative to the San Joaquin County Benchmark No UV-34 <br /> 1 Laboratory report indicates gasoline and unidentified hydrocarbons C6-02 <br /> 2 Detection limit raised Refer to analytical reports <br /> 3 MTBE by EPA Method 8260 <br /> 4 Laboratory report indicates gasoline and unidentified hydrocarbons>C 10 <br /> 5 MTBE by EPA Method 8260 analyzed past hold time by 20 minutes <br /> 6 MTBE by EPA Method 8260 analyzed past hold time by 59 minutes <br /> 7 Laboratory report indicates gasoline C6-C12 <br /> 8 Laboratory report indicates weathered gasoline C6-C12 <br /> 9 Laboratory report indicates hits confirmed past EPA recommended hold time <br /> 10 Laboratory indicates sample was analyzed outside of the EPA recommended holding time <br /> 11 Well development performed <br /> 12 TPH-G,BTEX and MTBE by EPA Method 8260 <br /> 13 MW-8 and MW-9 laboratory results appear to be switched and therefore results appear to be anomalous <br /> 01205 x is/#180183 7 As of 01/24/03 <br />