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TaF <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco(Former BP Oil)Service Station#811195 <br /> 16500 South 1-5 <br /> Lathrop,Califomia <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 /> (tL)=Feet TPH-G=Total Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> DTW=Depth to Water B=Benzene --=Not Measured/Not Analyzed <br /> S.I.=Screen Interval T-Toluene CC=Conductor Casing <br /> (ftbgs)=Feet Below Ground Surface E=Ethylbenzene NP=No Purge <br /> GWE=Groundwater Elevation X=Xylenes QA=Quality Assurancel'Ikip Blank <br /> (ms])=Mean sea level MTBE=Methyl tertiary butyl ether <br /> * On July 5,2002,the following weUs 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 rerun of Louise Avenue and Harlan Road,(Benchmark Elevation=14.77 feet,NGVD 29). <br /> TOC elevations referenced to cross in sidewalk,ran 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 LTV-34 at Mathey Road,45 feet north and 52 feet west of centerline(Elevation=12.50 feel above msl). <br /> 1 MTBE by EPA Method 9260. <br /> 2 Laboratory report indicates discrete peak C6. <br /> a Detection limit raised Refer to analytical yti reports. <br /> a MTBE by EPA Method 8260 analyzed dilution past recommended holding time. Initial analysis was within hold time. <br /> 5 Total Oil and Grease(TOG)was ND. <br /> .6 Halogenated Volatile Organic genic Compounds(HVOCs)were ND. <br /> 7 TOG was detected at 110 ppb. <br /> s Laboratory report indicates gasoline C6-C12. <br /> 9 <br /> Lebo rato <br /> ry report indicates unidentified hydrocarbons C6-C12. <br /> 10 MTBE reported from dilution run. <br /> 11 This sample was analyzed outside of the EPA recommended holding time. <br /> 17 Laboratory report indicates weathered gasoline C6-C12. <br /> 13 TPH-G and BTEX by EPA Method 8260. <br /> 14 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 /> 1s Well development performed. <br /> 16 TPH-G,BTEX and MTBE by EPA Method 8260. <br /> 17 Field Technician inadvertently missed well MW-8 for this event date. <br /> 1e TOC elevations were resurveyed in July 2002;data was provided on.April 15,2003. GWE data for the following events 08/15/02,11118-19102,02J13-14103,and 02121103 <br /> have been changed to reflect the new elevations. <br /> 19 TOC was altered,do not use in contouring. <br /> 111951ds/#180175 t As of 05113/03 <br />