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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 Dlssiilved <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gahohne MTBE and Additives Lcad <br /> Well Date (feet) (feet) (feet) (µg/L) WIL) (14g/L) WIL) (fig/,) (µgIL) (Ng/L) (Ag/L) <br /> VEW3 03/22/04 o NM 705 NC 101 [0 5 13 08 2,060 920t 81,000" NA <br /> a=Total volatile hydrocarbons. <br /> b=Resull is an estimated value because it exceeds the lmedr range. <br /> c=A typical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons Ctdoniiated hydrocarbons are suspected <br /> A groundwater sample c,ollccted from monitoring well MW6 on 4117192 contained chlorobenzene and 12 diLlilorobenzene <br /> d=A typical chroriiatograrm Analysts of this sdmple by EPA Method 624 on 4/17192(past EPA i-monnuended holding time)was positive for the <br /> following Llilonnated hydrocarbons vtnylehlonde cis-1 2 dicldoroethene lnLhloroedidne and tetraLliloroediane These peaks resulted in a positive <br /> fuel hydrocarbon reatilt <br /> c=A typicdl chromatogram.Four unknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspeLted <br /> f =A typicdl clnonidtogram An unknown peak was observed between MTBE and benzene Clilonmted tiydrocdrbons are suspected <br /> g=A typiLdl chromdtograrrL Analysis of this sample by EPA Method 624 on April 17 1992(past EPA retorntuended holding time) was positive for the <br /> fob u mg chlorinated hydrocarbons chlorobt izene and 12 dichlorobenzene <br /> It=MTBE by EPA Method 8260 <br /> i=Unidentified hydrocarbon in the C6 CI range <br /> 7=1 2-13irhlomeiliane, <br /> k=TPH as diesel <br /> 1=Sample analyzed outside EPA recommended holding time <br /> m=ten Aniyl o"iyl ether <br /> n-Tertiary butyl alcohol <br /> 0- , �roundwaiLr sample LolleLted from well <br /> P=SzmplLs collected 3 March 2004 did not arrive at laboratory on tune,site reminpled 22 MarLh 2004 <br /> TPH=Total Petroleum Hydrocarbons by EPA Method 8015 <br /> MTBE=Methyl tertiary holy]ether by EPA Method 8020 Modified except as noted <br /> Other oxygenate and additives may include ethanol tent butyl alcohol dusopropyl ether ethyl tertiary butyl ether tertiaryamyl methyl ether l 2 dibromoethane and 1 2 dichloroethaiie by <br /> g,lpro,Ws17370niiasterlwp\gO304L3708gw xls <br /> Page 2 t of 22 <br />