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TaWnJ <br /> Groundwater Monitoring and Analytical Results <br /> Tosco(Former BP Oil)Service Station#11195 <br /> 16500 South 1-5 <br /> Lathrop,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to May 20, 1999,(with the exception of September.1, 1998),were compiled from reports <br /> prepared by Blaine Tech,Inc. TPH-D=Total Petroleum Hydrocarbons as Diesel (ppb)=Parts per billion <br /> TOC=Top of Casing TPH-0=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> (ft.)=Feet --=Not Measured/Not Analyzed <br /> DTW=Depth to Water B=Benzene CC=Conductor Casing <br /> S.T.=Screen Interval T=Toluene NP=No Purge <br /> (ft.bgs)=feet Below Ground Surface E=Ethylbenzene QA=Quality Assurance/Trip Blank <br /> GWE Groundwater Elevation X=Xylenes <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether <br /> On July 5,2002,the following wells were surveyed(MW-13,MW-14.MW-15,MW-16,and MW-17)by Virgil Chavez Land Surveying. The benchmark for this survey <br /> was a brass disk,stamped"City of Lathrop Bench Mark No.5,"at the southeast curb return of Louise Avenue and Harlan Road,(Benchmark Elevation= 14.77 feet,NGVD 29). <br /> TOC elevations referenced to cross in sidewalk,run from City of Lathrop Benchmark No.5(Elevation=9.22 feet,ms]). Prior to May 20, 1999,TOC elevations <br /> were referenced to San Joaquin datum,brass cap UV-34 at Mathey Road,45 feet north and 52 feet west of centerline(Elevation= 12.50 feet above msl). <br /> MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates discrete peak C6. <br /> Detection limit raised. Refer to analytical reports. <br /> 4 MTBE by EPA Method 8260 analyzed dilution past recommended holding time. Initial analysis was within hold time. <br /> Total Oil and Grease(TOG)was ND. <br /> 6 Halogenated Volatile Organic Compounds(HVOCs)were ND. <br /> 7 TOG was detected at 110 ppb. <br /> 9 Laboratory report indicates gasoline C6-C12. <br /> 9 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> MTBE reported from dilution run. <br /> This sample was analyzed outside of the EPA recommended holding time. <br /> 12 Laboratory report indicates weathered gasoline C6-C12. <br /> 13 TPH-0 and BTEX by EPA Method 8260. <br /> 14 <br /> Laboratory report indicates a hydrocarbon pattern is present-in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. <br /> 1-5 <br /> Well development performed. <br /> t6 <br /> TPH-G,BTEX and MTBE by EPA Method 8260. <br /> 1t 195.x1s/#1 80175 15 As of 11/19/02 <br />