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IUUM 1 <br /> Groundwater Monitori to and Analytical Results <br /> Tosco(Circ 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 /> (B)=Feet B=Benzene ND=Not Detected <br /> DTW=Depth to Water T=Toluene -=Not Measured/Not Analyzed <br /> y <br /> S I =Screen Interval <br /> E=Eth lbenzene QA=Quality Assurance/Tnp Blank <br /> (ft_bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> • TOC elevations have been surveyed relative to the San Joaquin County Benchmark No UV-34 <br /> I Laboratory report indicates gasoline and unidentified hydrocarbons C6-CI2 <br /> x Detection limit raised Refer to analytical reports <br /> ] MTBE by EPA Method 9260 <br /> ° Laboratory report indicates gasoline and unidentified hydrocarbons>C 10 <br /> 3 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 /> 9 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 /> I i Well development performed <br /> 12 TPH-G,BTEX and MTBE by EPA Method 8260 <br /> 11 MW-8 and MW-9 laboratory results appear to be switched and therefore results appear to be anomalous <br /> 01205 xls/##180183 7 As of 01/24/43 <br />