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TAR 1 GROUND WATER MONITORING DATA Exxon Service Station 7-3708 2705 Country Club Boulevard Stockton, Callfonua Depth to Ground Reference Ground Water Ethyl- Total TPPH as Monrtonng Elevation Water Elevation Benzene Toluene benzene Xylenes gasoline MTBE Well Date (ft) (ft} (ft) (µg(L) (µg/L,) (µ9/L) (µgni,) (µg/L,) (µg/L) Comments e Total volatile hydrocarbons r Atypical chromatogram. An unknown peak was observed between MTBE and benzene § Chlorinated hydrocarbons are suspected. Result is an estimated value because it exceeds the linear range s Atypical chromatogram. Analysis oflhrs sample by EPA Method 624 on April 17,1942 Atypical chromatogram with umdentrfied peak(s)vathun the range of tine hydrocarbons 8� Y Chlorinated hydrocarbons are suspected, A ground water sample oollected from.monitoring EPA recommended holding tune),was positive for the following chlorinated hydrocarbons well MW-6 on April 17,1992,contained chlorobenzene and 1,2-dichlorobenzene chlorobenzene and 1,2-dichlorobenzene " Atypical chromatogram Analysis ofthw sample by EPA Method 624 on April 17,1992(past a EPA recommended holding tune),was positive for the following chlorinated hydrocarbons MTBE concentrations confirmed by EPA Method 8260 vinylcMonde,cis-1,24chlorodhene,tnchloroethana and tetrachloroethane These peaks Reference elevation =Elevation relative to mean sea level. resulted in a positive fuel hydrocarbon result. Depth to ground water =Measured from notch/mark on north edge of well casing. ° Atypical chromatogram. Four unknown peaks were observed causing a positive fuel hydrocarbon pg/L=Micrograms per liter ressult. Chlorinated hydrocarbons are suspected, TPPH=Total purageble petroleum hydrocarbons MTBE=Methyl tertiary butyl ether LPH-Liquid-phase petroleum hydrocarbons NS=Not sampled NA=Not analyzed NM—Not measured. NC=Not calculated. I I (Page 9 of 9) 93-809 XLS