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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Chevron Service Station#9-8632 <br /> 575 Grant Line Road <br /> Tracy,California <br /> EXPLANATIONS II <br /> Blaine <br /> I results prior to June 26,2000,were compiled from reports prepared by Tech Services,Inc <br /> Groundwater monitoring data and laboratory analytica - <br /> TOC=Top of Casing <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline TOG=Total Oil and Grease <br /> (ft)=Feet <br /> S=Benzene (ppb)=Parts per billion <br /> T=To NP=No Purge t <br /> GW E=Groundwater Elevation uene __—Not MeasuredMot Analyzed <br /> (ms])=Mean sea level E=Ethylbenzene , <br /> DTW=Depth to Water <br /> X=Xylenes ' QA=Quality Assurance/Trip Blank <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel MTBE=Methyl tertiary butyl ether - <br /> * TOC elevations were re-surveyed on March 19,2002,by Morrow Surveying Previous survey was completed on November 16,2000,by Virgil Chavez Land <br /> Surveying The elevations are based on the data provided by G-R Inc,holding TOC of MW-1 Measurements taken at approximate north side of top of box,top of <br /> casings were marked at location of measurements <br /> 1 Chromatogram pattern indicates an unidentified hydrocarbon <br /> Z EPA Method 5520 <br /> 3 Laboratory report indicates gasoline C6-C12 <br /> 4 Laboratory report indicates unidentified hydrocarbons C 10-C24 <br /> 5 Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> 6 Laboratory report indicates unidentified hydrocarbons<Cl6 <br /> MTBE by EPA Method 8260 <br /> i <br /> a Laboratory report indicates discrete peals <br /> 9 Laboratory report indicates unidentified hydrocarbons>C 16 , <br /> 10 requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> Laboratory report indicates hydrocarbon pattern present in the <br /> Laboratory report indicates gasoline <br /> 12 Laboratory report indicates Toluene did not confirm via GCMS <br /> 13 Laboratory report indicates this sample was originally analyzed within holding time Re-analysis for confirmation or dilution was performed past the ; <br /> recommended holding time <br /> 14 MTBE by EPA Method 8260 was analyzed outside recommended holding time <br /> 15 Due to laboratory error the TPH-D samples for MW-3 and MW-4 were composited The corresponding result is reported as MW-3 ; <br /> 16 Analysis with silica gel cleanup _ <br /> 7129105 <br /> 9-8632986855 <br />