ARCHIVED REPORTS XR0003437 - Laserfiche WebLink

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AKEI 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 Monitoring Elevation Ground Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (ft) Water(fl;) (ft) (µg/l-) Gtg/L) W/L) (n/L) WIL) W/L) 41.9/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 (Screened 08/30/94' 1270 -13 10 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 10 5-25 5 ft 11/22/94a 1338 -1378 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen bsg) 01/12/958 12 15 -1255 <0 5 <0 5 <0 5 <0 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 <0 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 I0/05/95 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 -975 <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 -793 <0 5 <0 5 <0 5 <0 5 <50 59 NA No LPH or sheen 08/20/97 998 -1038 <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 30 h No LPH or sheen 03/30/98 578 -6 18 <0 5 <0 5 <0 5 <0 5 <50 NA 16h No LPH or sheen 06/30/98 684 -724 <0 5 <0 5 <0 5 <0 5 <50 NA 29" No LPH or sheen 10/05/98 816 -856 <0 5 <0 5 <0 5 <0 5 <50 22 NA No LPH or sheen 12/16/98 750 -7 90 <0 5 <0 5 <0 5 <0 5 <50 15 NA No LPH or sheen ` Total volatile hydrocarbons Reference elevation -Elevation relative to mean sea level Result is an estimated value because it exceeds the linear range Depth to ground water =Measured from notchimark on north edge of well casing. ` Atypical CaamtaWgiam with unidentified peak(%)within the range of gasoline hydrocarbons Chlorinated V,-/L=Micrograms per Inter 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(rPH)by EPA Method 8015 Modified contained rhlocobeatzene and 1 2-dichlorobenzene MTBE=Methyl tertiary butyl ether by EPA Method 8020 except as noted Atypical Chrunmtogram. Analysis of thus sample by EPA Method 624 on April 17 1992(past EPA recommended Oxygenate compounds=sanple analyzed for ethanol t butanol MTBE di isopropyl ether ethyl tertiary butyl ether and t amyl holding tuue�was positive for the following chlorinated hydrocarbons vtmrylchlaride,cis-l,2-dnchloroethene methyl ether by FPA Method 8260 All analytes were reported below the laboratory detection limit,except as noted tnebloroethane and tcuw1iloroethatne These peaks resulted in a positive fuel hydrocarbon result LPH=Liquid phase petroleum hydrocarbons Atypical chromatogram. Four unknown peaks were observed causing a positive fuel hydrocarbon result NS=Not sampled NA=Not analyzed Chlorinated hydrocarbons are suspected. r Atypical chromatogram. An unknown peak was observed between MTBE and benzene NC Not measured C = NC=Not calculated Chlorinated hydrocarbons are suspected. •Atyp1W chromatogram, Analyos of thus wmple by EPA Method 624 on April 17 1992(past EPA recorrimcnded holding tnoel was positive for the following chlorinated hydrocarbons c3rlerober=ne and 1 2-drchlorobanzme MTBE concentratiom by EPA Method 8260 (Page 8 o1 8) 93-809 US