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GROUND WATER MONITORING DATA <br /> Exxon Senice Station 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton California <br /> Ground <br /> Reference Depth to Water Ethyl- Total TPPH as Oxygenate <br /> Monitoring Elevation Ground Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds <br /> Well Date (ft) Water(ft) (ft) (µt&L) (pg,L) (µg/L) (µL&L) (lxgAL) (µg/L) (µglL) Comments <br /> Trip Blank 08/31/99 --- --- --- <0 5 <0 5 <0 5 <0 5 <50 <2 5 NA <br /> 11/23/99 --- --- --- <1 Q -1 0 <1 0 <1 0 <50 <1 0 NA <br /> a—Total volatile hydrocarbons <br /> h=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 hvdrocarbon� (hlonnated hydrocarbons are suspected <br /> A ground water sample collected from momtonng well MW-6 on April 17 1992 contained c hloroben7enc and 1 2 do hloroben7enL <br /> d=A typical chromatogram Analysis of this sample by EPA Method 624 on April 17 1992(past I-P%rec ommended holding tirnc),w a5 posrtivc, for the <br /> following chlorinated hydrocarbons vrnvlchlonde,cis 1,2-diehloroethene,tncbloroethane and leirachloroethane These peaks resulted in a positive <br /> fuel hydrocarbon result <br /> e—A typical chromatogram Four unknown peaks were observed causing apositi%e fuel hvdrncarlion t-esult (hlonnated hydrocarbon~are suspected <br /> i <br /> t —A typical chromatogram An unknown peak wds obsen ed between MTBE and henzenc t Monti,Icd hvdrocarbons are tius)iectcd <br /> g=A typical chromatogram Analysis of this sample by EPA Method 624 on April 17 1992(past FPA recommended holding time) was positive for the <br /> i <br /> tollowine chlorinated hydrocarbons chlorobenzene and 12 dichlorobenzene <br /> h—MT13F concentrations by LPA'Method 8260 <br /> I=Unidentified htidrocdrbon in the C6-C 12 ranee <br /> i=1,2-Dichloroethane <br /> Reference elevation =Elevation relative to mean sea level <br /> Depth to emund water —Measured from notch�mark on north edge of well casing <br /> mg L=Micrograms per liter <br /> TPPH=Total purageble petroleum hydrocarlions or total petroleum hydrocarbons(TPH)by FPA Method 901 Modrtied <br /> MTBE=Metlivl tertiary butyl ether by EPA Method 8020 Modified except as noted <br /> Oxygenate compounds—sample analyzed torethano€,t butanol,MTBF di-isopropyl ether ethvl tern in butyl ether and t amyl methyl etherb} <br /> EPA Method 8260 All analytes were reported below the laboraton delec tion limit except as noted <br /> LPH—I iquid phase petroleum hydrocarbon-, <br /> NS—Not sampled <br /> NA=Not dndhzad <br /> NM=Not measured <br /> NC—Not calculated <br /> (Page 16 o1 16) 93 809 x€s <br />