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.�■ s 11111111• � � r>� � � !• � � � � <br /> TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708,2705 COUNTRY CLUB BOULEVARD,STOCKTON, CA <br /> Other <br /> Reference Depth to Groundwater Ethyl- Total TPH as Oxygenates and Dissolved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Additives Lead <br /> Well Date (feet) (feet) (feet) (pg/L) (gg/L) (µg/L) (}tg/L) (µg/L) W/L) (lig/L) (pglL) <br /> a= total volatile hydrocarbons <br /> b=Result is an estimated value because it exceeds the linear range <br /> c A typical chromatogram u illi unidentifLd peak(s)within the range of gasoline hydrocarbons Chlorinated hydrocarbons are suspected <br /> A groundwater sample collected from monitoring well MW6 on 4/17/92 contained chlorobenzene and 1 2-dichlorobenzene <br /> d=A typical chromatogram Analysts of this sample by EPA Method 624 on 4117192(past EPA recommended holding time)was positive for the <br /> following chlorinated hydrocarbons vinylehloride,cis-1,2-dichloroethene,tnchloroethane and tetrachloroethane These peaks resulted to a positive <br /> ttu.l hydrocarbon result <br /> L—A typical Lhiomatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspected <br /> f =A typu.al chromatogram An unknown peak was observed between MTBE and benzene Chlorinated hydrocarbons are suspected <br /> g=A typical chromatogram Analysts of this sample by EPA Method 624 on April 17,1992(past EPA recommended holding time),was positive for the <br /> tolloii ing chlorinated hydrocarbons chlorobenzene and 1,2 dichlorobenzene <br /> h=M1 BE by EPA Method 8260 <br /> i=Unidentified hydrocarbon in the C6-C12 range <br /> l= l,2-Dtchlorocthane <br /> k— TPH as dicsa.l <br /> I=5amph,analyzed outside EPA recommended holding time <br /> m -cert-Amyl methyl other <br /> n—Tertiary butyl alcohol <br /> o=Grab groundwater sample collected from well <br /> T P}1—Total Pelroleam I lydrocarbons by EPA Method 8015 <br /> MTBE Methyl tc.itiary butyl ether by EPA Method 8020 Modified,except as noted <br /> Other oxygenate and additives may include ethanol,tert-butyl alcohol,ditsopropyl ether,ethyl tertiary butyl ether,tertiary amyl methyl ether,i,2-dibromoethane,and 1,2 dtchloroethane by <br /> EPA Method$260 A]I analytes were reported below the laboratory detection limit,except as noted <br /> NA=Not analyzed <br /> N( Not calculated <br /> NM Not miabured <br /> 6 projactsk73708 mastehwpNgU90313708gw xis Page 19 of 20 <br />