ARCHIVED REPORTS XR0003438 - Laserfiche WebLink

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*LEI GROUND WATER MONITORING DATA Eason 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 Weil Date (ft) Water(ft) (ft) (µg/L) (µg/L) Gµg/L) Gµg/L) (µg/L) (µg/L) 649/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 11/22/94' 13 38 -1378 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen bsg) 01/12/95' 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 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 -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 7 53 -793 <0 5 <0 5 <0 5 <0 5 <50 5 9 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 3 0h No LPH or sheen 03/30/98 578 -6 18 <0 5 <0 5 <0 5 <0 5 <50 NA 16" No LPH or sheen 06/30/98 684 -724 <0 5 <0 5 <0 5 <0 5 <50 NA 29h No LPH or sheen 10/05/98 8 16 -856 <0 5 <0 5 <0 5 <0 5 <50 22 NA No LPH or sheen ` Total volatile hydrocarbons Reference elevation =Elevation relative to mean sea level Result is an estunaled value because it exceeds the linear range Depth to ground water =Measured from notch/mark on north edge of well casing, ` Atypical d ronwtogun with mudenttfied peaks)within the range of gasoline hydrocarbons Chlorinated 4L=lvbcrograms per liter hydrocarbons are suspected. A ground water sample collected firm monitoring well MW 6 on Apnl 17 1992 TPPH=Total purageble petroleum hydrocarbons or total petroleum hydrocuborss(TPH)by FPA Method 8615 Modified. contsmod chlasobenvme and 1 24rdilorobenzane. MME=Methyl tertiary butyl ether by EPA Method 8020,except as noted a Atypical drwnatogram Analysis of tlus sample by EPA Method 624 on April 17 1992(past EPA recommended Oxygenate compounds=sample analyzed far ethanol,t-butanol,MTBE dr-isopropyl ether,ethyl tertiary butyl ether and t-amyl holding ttmej was positive for the following chlarrnatod hydrocarbons vuryidAonde,ass-1 2-drehloroethene methyl ether by EPA Method 8260 All analytes were reported below the laboratory detection Itnut,except as noted tnchloroelhime and tetradda metharm These peaks resulted in a posrtn+e fuel hydrocarbon result. LPH=Liquid phase petroleum hydrocarbons ' teal du Four unknown NS=Not sampled Atyp otnatogtazrt peaks were observed causing a posstrve fuel hydrocarbon rau1L (hlonnated hydrocarbons aro suspecte& NA=Not analyzed. Atypical chro natogram. An unknown peak was observed between MTFE and benzene NM=Not measured. Chlonnated hydrocarbons are suspected NC=Not calculated s Atypical chromatopi m. Analysis of this sample by EPA Method 624 on Apn117,1992(past EPA recommended holding tmul,was positive for the following chlornated hydrocarbons chlorobemzwie and 1 2-dichlorobenzene 'MTBE concentrations by PPA Method 8260 (Page 8 of%) 93-809 XLS