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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 Other Oxygenates Dissolved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE and Additives Lead <br /> Well Date (feet) (feet) (feet) (µg/L) (gjlL) (1xg2) - (ptElL) . (Ag/L) (µg/L) (lig/L) _ (µg/L) <br /> VEW3 12/06/02 o NM 871 NC 344 250 165 178 NA 54,0001ND NA <br /> VEW3 03/17/03 NM 790 NC 126 255 125 3 5 7,080 11,600h 30 4m/21,000" NA <br /> VEW3 05/29/03 NM 841 NC 285 30 25 365 7,680 3,150" 16 5"'/23,400° NA <br /> VEW3 09/18/03 NM dry NC NS NS NS NS NS NS NS NS <br /> VEW3 12/09/03 NM dry NC NS NS NS NS NS NS NS NS <br /> VEW3 03/03/04 o,p NM 7 19 NC 940 07 1 7 1 1 1,540 932" 200,000" NA <br /> VEW3 03/22/04 o NM 705 NC 101 <0 5 13 08 2,060 92011 81,000" NA <br /> VEW3 06/01/04 o NM 767 NC 626 09 09 <0 5 1,040 330h 114,000" NA <br /> VEW3 09/16/04 o NM dry NC NS NS NS NS NS NS NS NS <br /> VEW3 12/03/04 o NM dry NC NS NS NS NS NS NS NS NS <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 chlorobenzene and 1,2-dichlorobenzene <br /> d=A typical chromatogram Analysis of this sample by EPA Method 624 on 4117/92(past EPA recommended holding time)was positive for the <br /> following chlorinated hydrocarbons vmytehlortde,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 between 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 chlorobenzene and 1,2-dichlorobenzene <br /> h=MTBE by EPA Method 8260 <br /> 1=Unidentified hydrocarbon in the C6-C12 range <br /> j= 1,2-Dichloroethane <br /> k=TPH as diesel <br /> g rprojects1737061masterlwplq 12Q413708gw xls Page 22 of 23 <br />