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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 Oxygenate Dissolved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Lead <br /> Well Date (feet) (feet) (feet) WIL) (AgIL) (ug/L) WIL) (µgAL) WIL) (µg/L) 01g/L) <br /> b=Result is an estimated value because it exceeds the linear range, <br /> c=Atypical c.hromatogratn with utudentrfred peal(s)within die range of gasoline hydrocarbons Chlorinated bydrocaibons are suspected <br /> A groundwater sample collected from morutoring well MW6 on 4117192 contained chlorobenzene and 1,2-dichlorobenzene <br /> d=A typical chromatogram Analysis of this sample by EPA Method 624 on4/17/92(past EPA recommended holding time)was positive for the <br /> following chlorinated hydrocarbons vmylchloride cis-1 2 dichloroethene,trreWomethane and tetrachloroethane.These peaks resulted rn a positive <br /> fuel hydrocarbon result <br /> e=A typical chromatogram.Pour unknown peaks were observed causing a positive fuel hydrocarbon result Clilonnated hydrocarbons are suspected <br /> f =A typical chromatograin-An unknown peal was observed between MTBE and benzene Chlorinated hydrocarbons are suspected <br /> g=A typical chrumatograri. Analysts 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=Analysis by EPA Method 8260 <br /> i=Unidentified hydrocarbon in the C6 C12 range <br /> =12 Dichloroethane <br /> I=TPH as diesel <br /> 1=Sample analyzed outside EPA recommended bolding time, <br /> in=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 level <br /> Depth to groundwater =Measured from notch/mark on north edge of well casing <br /> TPH=Total petroleum hydrocarbons by EPA Method 8015 Modified <br /> MTBE=Methyl tertiary butyl ether by EPA Method 8020 Modified,except as noted <br /> Oxygenate compounds=sample analyzed for ethanol t butanol,MTBE,di isopropyl ether,ethyl tertiary butyl ether,and t-amyt methyl ether by <br /> EPA Mtihod 8264 All analytes were reported below the laboratory detection limit except as noted <br /> NA=Not analyzed <br /> g 1projects1737118Unutiterlwp1g0302U7D8gw acts Page 17 of 18 <br />