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M MAP, M M M M M M 9%M M 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 Momtormg Elevation Ground Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (ft) Water(ft) (ft) (n/L) 4µg/L) (4g/L) 644) (µg/-) (µP/-) (>ag/L) Comments VEW-1 03/05/99 NM 797 NC <0 5 78 <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 1 5-13 ft bsg) 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 ftbsg) Total volatile hydrocarbons Reference elevation =Flev ition relative to mean sea level e Result is an estimated value because it exceeds the linear range D] pth to ground water =Measured from noich/mark on north edge of well casmb }LS/L=Microgra:m per liter ` Atypical chromatogram with umdeatified peak(s)within the range of gasoline hydrocarbuaie Chlorinated "IPPB=Total purageble petroleum hydrocarbons or total petrolewn hydrocarbons(fPH)by EPA Method 8015 Modified hydrocarbons aro suspected A ground water sample collected from momtormg well MW 6 on April 17,1992 MTBE=Methyl tertiary butyl ether by EPA Method 8020 Modified,except as noted contained chlonobenzepe and 1 2-dichlorobenzene oxygenate compounds=sample analyzed For ethanol 1 butanol MTBE ds isopropyl ether,ethyl tertiary butyl ether and t i Atypical chromatogram Analysis ofthis sample by EPA Method 624 on April 17 1992(pmt EPA atnyl methyl ether by PPA Method 8260 All analytes were reported below the laboratory detection limit except as noted recommended LPH=Liquid phase petroleum hydrocarbons holding tine),was positive for the following chloruiated hydrocarbons vinylchloride,cis 1,2 dtchloroelherne NS=Not sampled trichloroetliarie and tetrachiceoethane These peaks resulted m a positive Rel hydrocarbon result N A='+rot analyzed Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result NM=Not mcd ured Chlorinated hydrocarbons are suspected 11 C'=Not caiculuted r Atypical cht omatogtam An unknown peak was obscrvcd between MTBE and bcnzene Chlorinated hydrocarbons are suspected r Atypia!clxwnatoVain Analysis of this sample by EPA Method 624 on April 17 1992(past SPAr=mnmmdad holding unit),was positive for the following chlorinated hydrocarbons chlanbmzene and 1,2-dichlorobenzene ° MTBE ccoomtiatims by EPA Method 8260 r Uaaientifred hydrocarbon in the C6-C12 range (Nage 9 of 9) 93 3119 xl_