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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 TP14 as Oxygenate Dissolved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Lead <br /> Well Date (feet) (feet) (feet) OWL) (µg/L) WIL) (ug/L) (ug/L) (ug/L) (ug/L) WIL) <br /> c=A typical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons Clilonnated hydrocarbons are suspected <br /> A groundwater sample collected from monitoring well MW6 on 17 April 1992 chlorobenzene and 12 dichlorobenzene. <br /> d=Atypical chromatogram Analysts of this sample by EPA Method 624 on 17 April 1992(past EPA recommended holding time)was positive for the <br /> following chlorinated hydrocarbons vinyleldonde,cis-1,2 drehloinethene,trichloroethane and tetrachloroethane These peaks resulted to a positive <br /> fuel hydrocarbon result <br /> e=A typical chromatogram Fourunknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspected <br /> f =A typical chromatogram An unknown peal was observed between MTBE and benzene Chlonnated hydrocarbons are suspected <br /> g=A typical chromatogram Analysis of tilts sample by EPA Method 624 on 17 April 1992(past EPA recommended holding time) was positive for the <br /> following chlonnated hydrocarbons eblorobenzene and 1 2-dichlorobenzene <br /> h=Analysis by EPA Method 8260 <br /> i=Unidentified hydrocarbon in the C6-C12 range, <br /> l=1,2-DlcbloIoediane <br /> k=TPH as drew! <br /> 1=Sample analyzed outside EPA recommended holding time <br /> M=t-Amyl rnetli yl ether <br /> n=Tertiary butyl alcohol <br /> o=Grab groundwater sample collected from well <br /> Depth to groundwater =Measured from notchlmark on north edge of well casing <br /> TPH=Total Petroleum Hydrocarbons by EPA Method 8015 <br /> MTBE=Methyl tertiary butyl alter by EPA Method 8020 Modified except as noted <br /> i <br /> NA=Not analyzed <br /> NC=Not calculated <br /> I <br /> NM=Not measured <br /> NS=Not sampled <br /> gSprojects17370SWmterlwp440902L3708gw als Page 18 of 19 <br />