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Ta <br /> . Grnnndrvater MonitonngMWand Analytical Re,;i is <br /> Tosco(Circle K)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 /> I <br /> TQC=Top of Casing TPN-G=Total Petroleum Hydrocarbons as Gmnline (pph)=Parts per billion <br /> DTW=Depth to Water B=Benzene ND=Not Detected <br /> (ft)=Feet T=Toluene =Not Mcmiired/Not Analyzed <br /> 5 I =Screen Interval E=Ethylben7ene <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> TOC elevations have heen surveyed relative to the Can loaquin County Benchmark No UV-34 <br /> I Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> Z Detection limit raised Refer to analytical reports <br /> ` MTBE by EPA Method 8260 <br /> Laboratory report indicates gasoline and unidentified hydrocarbons>C10 <br /> 5 MTBE by EPA Method 9260 analyzed past hold time by 20 minutes <br /> F MTBE by EPA Method 8260 analyzed past hold time by 59 minutes <br /> Laboratory report indicates gasoline C6-C12 <br /> R 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 analysed outside of the EPA recommended holding time <br /> i Well development performed <br /> 0t205 x1!#180183 5 As of 07/19/01 <br />