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Fable 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco(Former BP Oil)Service Station#1 1 195 <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 3, 1998),were compiled from reports <br /> prepared by Blaine Tech,Inc. <br /> TOC=Top of Casing - TPH-D=Total Petroleum Hydrocarbons as Diesel (ppb)=Parts per billion <br /> (ft.)=Feet TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> DTW=Depth to Water B=Benzene - =Not Measured/Not Analyzed <br /> S.T.=Screen Interval T=Toluene CC=Conductor Casing <br /> (ft.bgs)=Feet Below Ground Surface E=Ethylbenzene NP=No Purge <br /> GWE=Groundwater Elevation X=Xylenes QA=Quality Assurance <br /> (msl)=Mean sea level MTBE=Methy] tertiary hutyl 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,msl). 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 ms]). <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 /> fi Halogenated Volatile Organic Compounds(HVOCs)were ND. <br /> 7 TOG was detected at i 10 ppb. <br /> A 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 /> 2 Laboratory report indicates weathered gasoline C6-C12. <br /> 13 TPH-G and BTEX by EPA Method 8260. <br /> 34 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 /> {5 Well development performed. <br /> TPH-G,BTEX and MT13E by EPA Method 8260. <br /> 11195.xfsig1r80175 c4 A;' 0litl5 02 <br />