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�a a a I_ a� aai l� r• � � � r_ � TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708,2705 COUNTRY CLUB BOULEVARD, STOCKTON, CA Reference Depth to Groundwater Ethyl- Total TPH as Other Oxygenates Dissolved Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE and Additives Lead Well Date (feet) (feet) (feet) (Etg/L} (}tg/L) (µg/L) (µg/L) 4 g/L) (pg/L) (Vt L) ( RRL) VEW3 12/09/03 NM dry NC NS NS NS NS NS NS NS NS VEW3 03/03/04 0,p NM 7 19 NC 940 07 17 1 1 1,540 932h 200,000" NA VEW3 03/22/04 o NM 705 NC 101 <0 5 13 08 2,060 920h 81,000" NA VEW3 06/01/04 o NM 767 NC 626 09 09 <0 5 1,040 330h 114,000" NA VEW3 09/16/04 o NM dry NC NS NS NS NS NS NS NS NS VEW3 12/03/04 o NM dry NC NS NS NS NS NS NS NS NS VEW3 03/23/05 o NM 750 NC <0 5 05 <0 5 <0 5 203 52 lh 1 90r/191,000" NA VEW3 06/27/05 0 NM 779 NC <0.5 <0.5 <0.5 0.5 9,330 48.0h 0 601/240,000" NA a=Total volatile hydrocarbons b=Result is an estimated value because it exceeds the linear range c=A typical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons Chlorinated hydrocarbons are suspected A groundwater sample collected from monitoring well MW6 on 4117192 contained chlorobenzene and 1,2-dichlorobenzene d=A typical chromatogram Analysis of this sample by EPA Method 624 on 4117192(past EPA recommended holding time)was positive for the following chlorinated hydrocarbons vmylchlortde,cis-1,2dichloroethene,trichloroethane and tetrachloroethane These peaks resulted in a positive fuel hydrocarbon result e=A typical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspected f=A typical chromatogram An unknown peak was observed between MTBE and benzene Chlorinated hydrocarbons are suspected 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 following chlorinated hydrocarbons chlorobenzene and 1,2-dichlorobenzene h=MTBE by EPA Method 8260 i=unidentified hydrocarbon in the C6-C12 range 1=1,2-Dichloroethane k=TPH as diesel 1=Sample analyzed outside EPA recommended holding time m=tert-Amyl methyl ether glprolects1737081rrmterlwplg0605L3748gw As Page 23 of 24