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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708, 2705 COUNTRY CLUB BOULEVARD, STOCKTON,CA <br /> Reference Depth to Groutidwater Ethyl- Total TPH as Oxygenate Dissolved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds I ead <br /> Well Date (feet) (feet) (feet) (lig/L) (lig/L) (pg/L) (µg/L) (µg/L) (1tgIL) (µg/L) (lig/L) <br /> following chlorinated hydrot,al bons vinyl chloride,cis-1,2-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 bt,tween 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 chlorohenzene and 1,2-dichlorobenzene <br /> h=Analysis by EPA Method 8260 <br /> I=UnidUthfied hydrocarbon In the C6-C12 range <br /> 3 1 2 Diehl oro(,thane <br /> k=TPH as diesel <br /> 1=Sample analyzed outside EPA recommended holding time <br /> m=t-Amyl methyl ether <br /> n=Tertiary butyl alcohol <br /> o—Grab groundwater sample collected from well <br /> Reference elevation =Elevation relative to mean sea letel <br /> Depth to groundwater =Meabured fiorn notch/mark on north edge of well casing <br /> TPH—Total petroleum hydiocarbons by LPA Method 8015 Modified <br /> MTBE=Methyl tertiary butyl ether by FPA Method 8020 Modified,except as noted <br /> Oxygenate compounds may Include ethanol,t-butanol,di isopropyl ether,ethyl tertiary butyl ether and t amyl methyl ether by <br /> EPA Mt,thod 8260 All analytes weie reported below the laboratory detection limit,except as noted <br /> NA=Not analyzed <br /> NC=Not calculated <br /> NM=Not inEaSured <br /> NS=Not sampled <br /> µg/t.=Micrograms pu hter <br /> g\PrOJLc6173708mias1erAwp,g05G2i3708gu xis Page 17 of 17 <br />