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TABLE 2 <br /> GROUND WATER MONITORING DATA <br /> Exxon Service Station 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Depth to Ground <br /> Reference Ground Water Ethyl- Total TPPH as <br /> Monitoring Elevation Water Elevation Benzene Toluene benzene Xylenes gasoline MTBE <br /> Well Date (ft) (ft) A (µg/L) (µg/L) (n/L) 4tg/L) G Lg/L) (m&) Comments <br /> MW-8 05/31/94 -040 1082 -1122 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 08/30/943 1270 -13 10 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 11/22/943 13 38 -1378 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 01/12/953 12 15 -1255 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 03/31/95 NM NC NS NS NS NS NS NS NM <br /> 04/05/95 776 -8 16 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 07/14/95 NM NC <0 5 <0 5 <0 5 <0 5 <50 NA NM <br /> 07/17/95 967 -1007 NS NS NS NS NS NS No LPH or sheen <br /> 10/05/95 1160 -1200 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 04/02/96 680 -720 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 07/31/96 935 -975 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 10/23/96 1029 -1069 <0 5 <0 5 <0 5 <0 5 <50 <5 0 No LPH or sheen <br /> 02/07/97 585 -625 <0 5 <0 5 <0 5 <0 5 <50 NA No LPH or sheen <br /> 05/30/97 753 -793 <0 5 <0 5 <0 5 <0 5 <50 5 9 No LPH or sheen <br /> a Total volatile hydrocarbons <br /> Reference elevation =Elevation relative to mean sea level <br /> b Result is an estunated value because it exceeds the Imear range Depth to ground water =Measured from notch/mark on north edge of well casing <br /> ` Atypical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons µg(L=Micrograms per liter <br /> Chlorinated hydrocarbons are suspected Aground water sample collected from momtormg TPPH=Total purageble petroleum hydrocarbons <br /> well MW-6 on April 17, 1992,contained chlorobenzene and 1,2-dichlorobenzene MTBE=Methyl tertiary butyl ether <br /> a Atypical chromatogram Analysis ofthis sample by EPA Method 624 on April 17,1992(past LPH=Liquid-phase petroleum hydrocarbons <br /> EPA recommended holding tune),was positive for the following chlorinated hydrocarbons N5=Not sampled <br /> vmylchlonde,cis-l,2-dichloroethene,trichloroethane and tetrachloroethane These peaks NA=Not analyzed <br /> resulted in a positive fuel hydrocarbon result NM=Not measured <br /> Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon NC=Not calculated <br /> result Chlorinated hydrocarbons are suspected <br /> r Atypical chromatogram An unknown peak was observed between MTBE and benzene <br /> Chlorinated hydrocarbons are suspected <br /> ° Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17, 1992(past <br /> EPA recommended holding time) was positive for the following chlorinated hydrocarbons <br /> chlorobenzene and 1,2-dichlorobenzene <br /> 9 0 (Paize 8 A-809"XLS <br />