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Tt1 <br /> Groundwater Monitoring a and Analytical Results <br /> Chevron Service Station#9-2033 <br /> 508 West Charter Way <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results pnor to May 31,2000,were compiled from reports prepared by Blaine Tech Services,Inc <br /> TOC=Top of Casing E=Ethylbenzene Pb=Lead <br /> (ft)=Feet X=Xylenes Zn=Zinc <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether --=Not Measured/Not Analyzed <br /> (ms])=Mean sea level 1,2-DCA= 1,2-Dichloroethane TBA=Tertiary butyl alcohol <br /> DTW=Depth to Water (ppb)=Parts per billion DIPS=Di-isopropyl ether <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel TOG=Total Oil and Grease TAME=Tertiary amyl methyl ether <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline Cd=Cadmium ETBE=Ethyl tertiary butyl ether <br /> B=Benzene Cr—Chromium QA—Quality Assurance/Trip Blank <br /> T=Toluene Ni=Nickel <br /> ^ TOC elevation altered due to wellhead maintenance on May 21, 1998 <br /> 1 Chromatogram pattern indicates an unidentified hydrocarbon <br /> 2-Methylnaphtalene and Naphthalene were 8 7 and 33 ppb respectively <br /> } 2-M ethyl naphtalene and Naphthalene were 8 7 and 50 ppb respectively <br /> Naphthalene was detected at 34 ppb <br /> 5 2-Methylnaphtalene and Naphthalene were 5 3 and 35 ppb respectively <br /> 6 Ethanol,TBA,DIPS,TAME and ETBE by EPA 8260 were not detected,see lab report for detection limits <br /> 7 MTBE by EPA Method 8260 <br /> B Diethylphthalate was detected at 6 9 ppb <br /> 9 Naphthalene was detected at 6 8 ppb <br /> 10 Due to laboratory error,TPH-D was not analyzed <br /> I i Odor <br /> 12 Laboratory report indicates unidentified hydrocarbons>C16 <br /> B Laboratory report indicates gasoline C6-C12 <br /> 14 All other Semivolatile Organic Compounds(SVOCs)by EPA Method 8270 were ND,except for Bis(2-ethylhexyl)phthalate was detected at 27 ppb <br /> is All other Volatile Organic Compounds(VOCs)by EPA Method 8010 were less than the reporting limit <br /> 16 All other SVOCs by EPA Method 8270 were less than the reporting limit,except for B i s(2-ethylhexyyl)phthal ate was detected at 12 ppb <br /> 17 All other VOCs by EPA Method 8010 were less then the reporting limit,except for Chloroform which was detected at 1 7 ppb <br /> 18 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6 <br /> 19 Laboratory report indicates that this sample was analyzed outside of the EPA recommended holding time <br /> 20 All sample containers were broken on this date <br /> i <br /> 9-2033 xls/#386847 6 As of 02/09/04 <br /> I <br />