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T 1 <br /> Groundwater Monitorinta and Analytical Results <br /> Tosco(Circle K)Unit#01205 <br /> 16470 Cambridge Street V <br /> Lathrop,California <br /> EXPLANATIONS: <br /> Groundwater momtonng 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 <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> OWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No W-34 <br /> I Laboratoryre indicates <br /> ort p gasoline and unidentified hydrocarbons C6-C12 <br /> 2 Detection hmit raised Refer to analytical reports <br /> 3 MTBE by EPA Method 8260 <br /> ° Laboratory report indicates gasoline and unidentified hydrocarbons>C10 <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 /> Laboratory report indicates gasoline C6-C12 <br /> S 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 /> 01205 xis!#180183 5 As of 100101 <br />