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Groundwater MonitoringData and Analytical Results • <br /> Y <br /> Chevron Service Station#9-2033 <br /> 508 West Charter Way <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to May 31,2000,were compiled from reports prepared by Blaine Tech Services Inc <br /> TOC=Top of Casing T=Toluene Pb=Lead <br /> (ft)=Feet E=Ethylbenzene Ni=Nickel <br /> GWE=Groundwater Elevation X=Xylenes Zn=Zinc <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol <br /> DTV=Depth to Water 1,2-DCA= 1,2-Dichloroethane DIPE=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 Cr=Chromium ETBE=Ethyl tertiary butyl ether <br /> B=Benzene Cd-Cadmium --=Not Measured/Not Analyzed <br /> (ppb)=Parts per billion <br /> *Top of casing elevation altered due to wellhead maintenance on May 21, 1998 <br /> 1 Chromatogram pattern indicates an unidentified hydrocarbon <br /> 2 2-Methylnaphtalene and Naphthalene were 8 7 and 31 ppb respectively <br /> 1 2-Methylnaphtalene and Naphthalene were 8 7 and 50 ppb respectively <br /> ° Naphthalene was detected at 34 ppb <br /> 5 2-Methylnaphtalene and Naphthalene were 5 1 and 15 ppb respectively <br /> 6 Ethanol,TBA,DIPE,TAME and ETBE by EPA 8260 were not detected,see lab report for detection limits <br /> 7 MTBE by EPA Method 8260 <br /> 9 Diethylphthalate was dLlCLted at 6 9 ppb <br /> 9 Naphthalene was detected at 6 8 ppb <br /> 10 Due to laboratory error TPH-Diesel was not analyzed <br /> Odor <br /> 12 Laboratory report indicates unidentified hydrocarbons>C16 <br /> 11 Laboratory report indicates gasoline C6-C12 <br /> 14 <br /> Semâ–ºvolatile Organic Compounds(SVOCs)by EPA Method 8270E were ND,except for Bis(2-ethylhexyl)phthalate was detected at 27 ppb <br /> 19 Volatile Organic Compounds(VOCs)by EPA Method 8010B were less than the reporting limit <br /> 16 SVOCs by EPA Method 8270E were less than the reporting limit,except for Bis(2-ethylhexyyl)phtalatewas detected at 12 ppb <br /> 17 VOCs by EPA Method 8010B were less then the reporting limit,except for Cholorform which was detected at 1 7 ppb <br /> I <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 /> 213 All sample containers were broken on this date <br /> 9 2033 xls/#386847 5 As of 12/02/00 <br />