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TABLE 2 GROUNDWATER MONITORING DATA FORMER EXXON RS 7-3708 2705 COUNTRY CLUB BOULEVARD,STOCKTON,CA <br /> Reference Other <br /> Depth to Groundwater Ethyl- Total TPH as Oxygenates and Dissolved <br /> Mtmltotmg Elevation Grotmtivvater Elevation Benzene Toluene benzene X lenes <br /> Well Date (feet) (feet) (feet) (µBSL) Lead <br /> (µ8J1-) (µ8/L) (µe J (�S�L) PgA) (µline MTBE Additives <br /> s (µms <br /> W hydrocarbon result <br /> e`A typical cluiomatograft Four Wlkaown peaks were observed causing a Positive fird hydrocarbon result Chlorinated hydrocarbons are suspected. <br /> f-A typical domotograrn.An unknown peak was observed between MTBE and bermne. Chlorinated hydrocarbons are suspected. <br /> g'A typical n. Analysis of this sample by EPA Method 624'. <br /> April 17,1992(past EPA r wmmnded holding time),was positive for the <br /> 8 chlorinated hydrocarbons:chhxobenwm and 1,2-dichlorobenzene. <br /> f h-MTBE by EPA Method 8260. <br /> r-UnWenttifkd hydrocarbon in the C&C12 range. <br /> j- <br /> 1,2-Dichloroetbane. <br /> k-TPH as diesel. <br /> I-SUIIPICanalyzed outside EPA recommended holding time. <br /> In-lat-Amyl me"ether. <br /> e-Tertiary butyl alcohol. <br /> o-Grab groundwater Samek collected from well. <br /> Depth to —Measured tram notchhnark on north edge of well casing. <br /> r TPH-TaW Petroleum Hydrocarbons by EPA Method 8015. <br /> MTBE'Me"tertiary butyl ether by EPA Method 8020 Modified,--pt as noted. <br /> Odm oxygdnW and additives may include OdWml,tert4mtyl alcohol,diieopropyl ether,ethyl tertiary butyl ether,tertiary amyl methyl ether,1,2-dik moethane,and 1,24chloroethane by <br /> EPA Method 8260.All analyft were reported below the laboratory detaxion limit,except as rated. <br /> NA-)ft analyzed. <br /> NC-Not calculated. <br /> NM-Not measured. <br /> NS-Not sampled. <br /> Pg'L-Mkmgmm Per liter. <br /> Note:TPH-g rew$t beginning March 2002 uwjt*MTBE. <br /> °'V"*GM737 U,VdO7oakw2.x <br /> Page 19 of 19 <br />