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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) (pg/L) (pg/L) ( g/L) (pg/L) (pg/L) (pg/L) (µg/L) <br /> VEW3 12/06/02 o NM 871 NC 344 250 165 178 NA 54,000 ND NA <br /> VEW3 03/17/03 NM 790 NC 126 25.5 125 35 7,080 11,600` 30 4"`/21,000° NA <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 peak(s)within the range of gasoline hydrocarbons Chlorinated hydrocarbons are suspected <br /> A groundwater sample collected from monitoring well MW6 on 4/17192 contained chloiobenzene and 1,2 dichlorobenzene <br /> d=A typit,dl chromatogi ant Analysis of this sample by EPA Method 624 on 4117/92(past CPA recommended holding time)was positive for the <br /> following chloi inated hydrocarbons vinylchlorift,cis 1,2-dichloroethene,trichloroethane and tetrachloroethane These peaks resulted to a posane <br /> fuel hydrocarbon rLsulI <br /> e=A typical cluontatogiam I Our unknown peaks were observed causing a positive fuel hydrocarbon result Chlor inated hydiocarbons are suspected <br /> f=A typical chromatogram An unknown peak was observed between M FBE and benzene Chloiinated 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=M rBE by EPA Method 8260 <br /> t=Unidentified hydrocarbon in the C6-C2 iange <br /> - 1,2 DlLhlorocthane <br /> k= rPH as diesel <br /> I=Sample analyLed 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 /> Depth to groundwatet =Measured from notLlVmark on north edge of well casing <br /> TPH=Total Petroleum Hydrocarbons by EPA Method 8015 <br /> MTBE-Methyl tertiary butyl ether by LPA Method 8020 Modified,except as noted <br /> Other oxygenate and additives may include,Lthanol,tett-butyl alcohol,dnsopropyl ether,ethyl tertiary butyl ether,tertiary amyl methyl ether, 1,2-dibrumoethane,and I,2-dichloroethane by <br /> g 1projecls573708rnt.esleruap g03030708gw xis Page is of 19 <br />