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Ta�am <br /> tical Results <br /> Groundwater Monitoring L y y'and Analytical <br /> Tosca(Former BP Oil)Service Station#11195 <br /> 16500 South 1-5 <br /> Lathrop,California <br /> 4. <br /> 4 <br /> EXPLANATIONS: <br /> p y p p ) were compiled from reports k' <br /> P <br /> Groundwater monitoring data and laboratoryanalytical results prior to May 20, ]999,{with the exception of September 3, 199 `. <br /> prepared by Blaine Tech,lnc. (ppb)=Parts per billion <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel <br /> ND=Not Detected <br /> TOC=Top of Casing <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline Not Measured/Not Analyzed <br /> (ft.)=Feet <br /> B=Benzene CC=Conductor Casing <br /> DTW=Depth to Water T=Toluene <br /> S.I.=Screen Interval NP=No Purge <br /> E=Ethylbenzene QA=Quality AssurancelTrip Blank <br /> (ft.bgs)=Feet Below Ground Surface ]{—Xylenes <br /> GWE=Groundwater Elevation <br /> MTBE=Methyl tertiary butyl ether <br /> {msl}=Mean sea level for this survey <br /> ` <br /> * <br /> its were surveyed(MW-l3,MW-14,MW-15,MW-16,and MW-17)by Virgil Chavez Land Surveying. The benchmark <br /> On July 5,2002,the following we <br /> return of p <br /> was a brass disk,stamped"City of Lathrop Bench Mark No. 5, at the southeast curb t msl)a Priorto(May 20, 19 9'TOC t 1999,TOC 14.77 <br /> was <br /> NGVD 29). <br /> TOC elevations referenced to cross in sidewalk,run from City of Lathrop Benchmark No.S (Elevation=9.22 fee <br /> were referenced to San Joaquin datum,brass cap UV-34 at Mathey Road,45 feet north and 52 feet west of centerline(Elevation= 12.54 feet above ms!}. <br /> MTBE by EPA Method 8260. <br /> Z Laboratory report indicates discrete peak C6. - <br /> 3 Detection limit raised. Refer to analytical reports. <br /> a <br /> MTBE by EPA Method 8260 analyzed dilution past recommended holding time. Initial analysis was within hold time. <br /> S Total Oil and Grease(TOG)was ND. <br /> 6 Halogenated Volatile Organic Compounds,(HVOCs)were ND. <br /> 7 TOG was detected at 1 10 ppb. <br /> 9 Laboratory report indicates gasoline C6-C12. <br /> 9Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> 10 MTBE reported from dilution run. <br /> 1 t This sample was analyzed outside of the EPA recommended holding time. <br /> 12 Laboratory report indicates weathered gasoline C6-C12. <br /> 13 TP1i-G and BTEX by EPA Method 8260. <br /> e requested fuel quantitation range but does not resemble the pattern.of the requested fuel. <br /> 14 Laboratory report indicates a hydrocarbon pattern is present in th <br /> 45 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 /> 19 TOC elevations were resurveyed in July 2002;data was provided on April 15,2003. GWE data for the following events 08115102, 11118-19102,02113-14103,and 02/21/03 <br /> have been changed to reflect the new elevations. <br /> 19 TOC was altered,do not use in contouring. <br /> As of 05/13/03 <br /> 17 <br /> 11195.xlsl#180175 <br />