ARCHIVED REPORTS XR0003433 - Laserfiche WebLink

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M JOAN M i M me GROUND WATER MONITORING DATA Exxon Service Station 7-3708 2705 Country Club Boulevard Stockton, California Ground Reference Depth to Water Ethyl- Total TPPH as Oxygenate Monitoring Elevation Ground Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date A Water(ft) (ft) 4xg/L) (µg/L) (gg/L) (µg/L) 41g/L) (gg/L) (µg/L) Comments MW-9 06/04/99 205 901 -696 <0 5 <0 5 <0 5 <0 5 <50 NA 4 00 No LPH or sheen (Screened 08/31/99 1046 -841 <0 5 <0 5 <0 5 <0 5 <50 <2 5 NA No LPH or sheen 5-20 ft bsg) MW-10 06/04/99 078 782 -704 <0 5 <0 5 <0 5 <0 5 <50 NA 77 5h 6 54� No LPH or sheen (Screened 08/31/99 924 -846 <0 5 <0 5 <0 5 <0 5 <50 46 NA No LPH or sheen 5-20 ft bsg) VEW-1 03/05/99 NM 797 NC <0 5 7 8 <0 5 <0 5 871 <2 5 NA No LPH or sheen (Screened 05/14/99 NM NC NS NS NS NS NS NS NS Not observed 5-13 ft bsg) 06/04/99 NM NC NS NS NS NS NS NS NS Not observed 08/31/99 NM NC NS NS NS NS NS NS NS Not observed VEW-3 03/05/99 NM 703 NC <0 5 <0 5 <0 5 <0 5 <50 <2 5 NA No LPH or sheen (Screened 05/14/99 NM NC NS NS NS NS NS NS NS Not observed 3-10 ft bsg) 06/04/99 NM NC NS NS NS NS NS NS NS Not observed 08/31/99 NM NC NS NS NS NS NS NS NS Not observed Trip Blank 08/31/99 --- --- --- <0 5 <0 5 <0 5 <0 5 <50 <2 5 NA ` Total volatile hydrocarbon, Reference elevation =Llet ation relative to mean sea level t Result i an e.timated ti alue becau_e it exceeds the linear range Depth to groundµater —Mea,ured from notch/mark on north edge of well ca mg Atypical chromatogram with uiudentilied peak(,)w ithm the range of gasoline hydrocarbon, Chlorin sted µg L—Microgram-per liter hydrocarbons are aunpected A ground water cample collected from monitoring well%1W 6 on 4pril 17 199' TPPH=Toiat pural eble petroleum hvdrocarbons or total petroleum hydrocarbon.(TPH)by EPA Method Sol5 Modified contained chlorobenzene and 1,2 dichlorobenzene y MTBF=Meth}I tcrtiar%butyl ether by EPA Method 8020 Modified except as noted Oxygenate compound= ample analyzed for ethanol t butanol MTBE,di isopropyl ether,ethyl tertiary butyl ether and a Atypical chromatogram Analysis ofthis,ample by EPS Method 624 on April 17 1992(p&t EP A reconunen led t amvl methyl ether by EPA Method 8260 All analytes were reported below the laboratory d�teCtLOn limit,except as noted holding time) was positive for the following chlonnated hvdrocarbons vinylchlonde ci- i 2 dichlcaoethene LPH—Liquid phase petroleum hvdrocarbom trichloroethane and tetrachloroethane These peak, resulted in a positive fuel hydrocarbon re<ult N S—Not sampled Atypical chroina[ Four unknown eaks were oh ened musing a o.itrtie fuel hNdrocarboii re ult typ ogram p g P N S='got anuli zed Chlorinated hydrocarbons are suspected NM—Not inea ured r Atypical chromatogram An unknown peak wa_ob_en ed between MTBE and benzene NC=Not calculated Chlorinated hydrocarbons are suspected s Atypical chromatogram Analysis of thus sample by EPA Method 624 on April 17 1992(past EPA recommended holding timej,was positive for the following chlonnated hydrocarbons chlombe,wene and 1,2 dichlorobenzene " MTBE concentrations by EPA Method 8260 Unidentified hydrocarbon in the C6-Cl2 range 12 Dichloroethane (Pate 1I of 13) 93 209 vis