ARCHIVED REPORTS XR0003434 - Laserfiche WebLink

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= M 'W2M M M M M M M I GROUND WATER MONITORING DATA Exxon Sen,lce Station 7-3708 2705 Country Club Boulevard Stockton, Cahfornla Ground Reference Depth to Water h1hyl- Total TPPH as Oxygenate Momtornlg Elevation Ground Elevation Benzene l oluene benzene Xylenes gasolene MTBE Compounds Well Date (ft) Water(ft) (ti.) (4g/1.) (µg/L) (µglL) (µg/L) (µg/L) 41g/L) (µg/L) Comments MW-9 06/04/99 204 901 -697 <0 5 <0 5 <0 5 <0 5 <50 NA 4 O(P No LPH or sheen (Screened 5-20 ft bsg) MW-10 06/04/99 078 7 82 -704 <0 5 <0 5 <0 5 <0 5 <50 NA 77 5h, 6 541 No LPH or sheen (Screened 5-20 ft bsg) VEW-1 03/05/99 NM 797 NC <0 5 7 8 <0 5 <0 5 87' <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 VEW-3 03/05/99 NM 7 03 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 Total volatile hydrocarbons Reference elevation —Elevatmi relative to mean sea level b Result is an estimated value because it exceed,the linear range Depth to ground water =Measured from notch/mark on north edge of well casing ` Atypical chrmnalograrri with unidentified peak(s)within the range of basohne hydrocarbons Chlanuated ig/L=Micrograins per liter hydrocarbons are suspected A ground water sample collected from nionitonng well MW 6 on April 17 1997 TPPH=Total purabeble petroleum hydrocarbons or total petroleum hydrocarbons(TPH)by EPA Method 8015 Modified contained chlorobenzene and 1,2 dichlorobenzene MTBE=Methyl tertiary butyl ether by EPA Method 8020 Modified,except as noted Oxygenate compounds--sample mialyzed for ethanol t butanol,MTBE,di isopropyl ether,ethyl tertiary butyl ether,and d Atypical chromatogram, Analysis of this sample by EPA Method 624 on April 17 1992(past EPA recorrancuded t amyl methyl ether by EPA Method 8260 All analytes were reported below the laboratory detection smut,except as noted holding tune),was peoitive for the following cUormated hydrocarbons vinylchlonde,cis 1,2 dichloroethene LPH=Liquid phase petroleum hydrocarbons trichloroethane and tetrachloroethane These peaks resulted in a positive fuel hydrocarbon reault NS—Not sampled Atypical chroinalogram Four unknown peaks were observed causing apositive fuel hydrocarbon result NA—Not analyzed Chlormated hydrocarbons are suspected NM=Not mea�ured r Atypical chromatogram An unknown peak was observed between MTBE and benzene NC=Not c alculaled Chlorinated hydrocarbons are suspected 8 Atypical chromatogram Analysis of this sample by EPA Method 624 an April 17 1992(past EPA recommended holding time) was positive for the following chlormaled hydrocarboas chlorobenzene and 12 dichlorobenzene ° MTBE concentrations by EPA Method 8260 t Unidentified hydrocarbon m the C6-Cl2 range i 12 Dichloroethane (P,izc 12 of 1]) 91 ,09 xi,