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TAID1 GROUND WATER MONITORING DATA F axon Sen ice Station 7-3708 2705 Countn, Club 13ou1evard Sto(-kton, California Ground Reference Depth to Water Ethyl- Total TPPH as Oxygenate Monitonng Elevation Ground Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (ft) Water(ft) (ft) Gtg/L) (µg/L) (µg/L) (µg/L) (µg/L) GLg/L) (µ9/L) Comments MW-8 05/31/94 -040 1082 -1122 0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 08130/94a 1270 -13 10 <tl 5 <)5 <0 5 <0 5 <50 NA NA No LPH or sheen 11/22/94a 13 38 -13 78 <0 5 <0 5 <0 5 0 5 <50 NA NA No LPH or sheen 01/12/95a 12 15 -12 55 <0 5 <0 5 <0 5 <1 5 <50 NA NA No LPH or sheen 03/31/95 NM NC NS NS NS NS NS NS NS NM 04/05/95 776 -8 16 <0 5 -0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 07/14/95 NM NC <1 5 <0 5 <0 5 <0 5 <50 NA NA NM 07/17/95 967 -1007 NS NS NS NS NS NS NS No LPH or sheen 10/05/95 1160 -1200 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 04/02/96 680 -720 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 07/31/96 935 -9 75 <0 5 0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 10/23/96 1029 -1069 <0 5 <0 5 <0 5 <0 5 <50 <5 0 NA No LPH or sheen 02/07/97 585 -625 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 05/30/97 753 -7 93 <0 5 <0 5 <0 5 <0 5 <50 5 9 NA No LPH or sheen 08/20/97 998 -10 38 <0 5 <0 5 <0 5 <0 5 <50 10 NA No LPH or sheen 11/24/97 965 -1005 <0 5 <0 5 <0 5 <0 5 <50 NA 3 0' No LPH or sheen 03/30/98 578 -6 18 <0 5 <0 5 <0 5 <0 5 <50 NA 161i No LPH or sheen 06/30/98 684 -7 24 <0 5 <) 5 <0 5 <0 5 <50 NA 2911 No LPH or sheen Total volatile hydrocarbons Reference elegy anion =Elevation relative to mean sea level ° Result is an estimated value because it exceeds the linear range Depth to ground water -Measured from notch/mark on north edge of well casing ` Atypical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons Chlorinated fi&L-Micrograms per liter hydrocarbons are suspected A ground water sample collected from monitoring well MW 6 on April 17 1992 TPPH=Total purageble petroleum hydrocarbons or total petroleum hydrocarbons(TPH)by EPA Method 8015 Modified contained chlorobenzene and 1 24chlorobenzene MTEE=Methyl tertiary butyl ether by EPA Method 8020 except as noted Atypical chromatogram Analysis ofthis sample by EPA Method 624 on April 17 1992(past EPA recommended Oxygenate compounds=sample analyzed for ethanol t butanol MTBE di isopropyl ether ethyl tertiary butyl ether and t amyl holding time) was positive for the following chlorinated hydrocarbons vinylchloride cis 12 dichlomethene methyl ether by EPA Method 8260 All analytes were reported below the laboratory detection limit except as noted tnchloroethane and tetrachloroethane These peaks resulted in a positive fuel hydrocarbon result LPH=Liquid phase petroleum hydrocarbons ' Atypical chromatogram Four unknown peaks w ere observed causing a positive =hot sampled fuel hydrocarbon result HA=Nat analyzed Chlorinated hydrocarbons are suspected 'JAI Not measured r Atypical chromatogram An unknown peak was observed between MTBE and benzene VC=Not calculated Chlorinated hydrocarbons are suspected 'Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17 1992(past EPA recommended holding tune) was posdzve for the fogoWuig chlorinated hydrocarbom chlorobenzene and 1 2-dichlorobenzene h MTBS concentrations by EPA Method 8260 (Page 8 of S) 93 909)J S