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t� ti law � s� � I_ � � � � � � � 1• i• � � <br /> TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708,2705 COUNTRY CLUB BOULEVARD, STOCKTON, CA <br /> Reference Depth to Groundwater Ethyl- Total TPH as Other Oxygenates Dissolved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylencs gasoline MTBE and Additives Lead <br /> Well Date (feet) (feet) (feet) ( ) (µg/L) ( L ( L) ( µg/L) <br /> a=Total volatile hydrocarbons <br /> b—Result is an estimated value because it exceeds the linear range <br /> c=A typical chromatogram with unidentified peaks)within the range of gasoline hydrocarbons Chlorinated hydrocarbons are suspected <br /> A groundwater sample collected from monitoring well MW6 on 4117192 contained chlorobenzene and 1,2-dichlorobenzene <br /> d=A typical chromatogram Analysis of this sample by EPA Method 624 on 4117192(past EPA recommended holding time)was positive for the <br /> following chlorinated hydrocarbons vinylchlonde,cis-l,2-dichloroethene,trichloroethane and tetrachloroethane These peaks resulted in a positive <br /> fuel hydrocarbon result <br /> e—A typical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspected <br /> f=A typical chromatogram An unknown peak was observed between MTBE and benzene Chlorinated hydrocarbons are suspected <br /> g=A typical chromatogram Analysis of this sample by EPA Method 624 on April 17,1992(past EPA recommended holding time),was positive for the <br /> following chlorinated hydrocarbons chlorobenzene and 1,2-dichlorobenzene <br /> h=MTBE by EPA Method 8260 <br /> t=Unidentified hydrocarbon in the C6-C12 range <br /> 1 1,2-Dichloroethane <br /> k=TPH as diesel <br /> I=Sample analyzed outside EPA recommended holding time <br /> m=tert-Amyl methyl ether <br /> n=Tertiary butyl alcohol <br /> o=Grab groundwater sample collected from well <br /> p=Samples collected 3 March 2004 did not arrive at laboratory on time,site resampled 22 March 2004 <br /> TPH=Total Petroleum Hydrocarbons by EPA Method 8015 <br /> MTBE=Methyl tertiary butyl ether by EPA Method 8020 Modified,except as noted <br /> Other oxygenate and additives may include ethanol,tert-butyl alcohol,diisopropyl ether,ethyl tertiary butyl ether,tertiary amyl methyl ether,1,2-dibromoethane,and 1,2-dichloroethane by <br /> EPA Method 8260 All analytes were reported below the laboratory detection limit,except as noted <br /> NA=Not analyzed <br /> g 1projects173768V=ter\wp1g090413708gw x1s <br /> Page 22 of 23 <br />