ARCHIVED REPORTS XR0003441 - Laserfiche WebLink

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i TAS r! GROUND WATER MONITORING DATA Exxon Service Station 7-3708 2705 Country Club Boulevard Stockton, California Depth to Ground Reference Ground Water Ethyl- Total TPPH as Oxygenate Monitoring Elevation Water Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (ft) (ft) (ft) 6}1g/L) 44L) 4tg/L) (n/L) (µg/L) (n L) (pg/L) Continents MW-8 05/31/94 -040 1082 -1122 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 08/30/948 1270 -13 10 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 11/22/948 1338 -1378 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 01/12/95a 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 -816 <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 5 85 -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 3 0h No LPH or sheen 'Total volatile hydrocarbons a Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17 1992(past °Result is an estimated value because it exceeds the linear range EPA recommended holding tune) was positive for the following chlorinated hydrocarbons chlorobenzene and 1,2-dichlorobenzene chromatogram with umdentified peak(s)within the range of gasoline hydrocarbons Chlorinated c hydrocarbons are suspected Aground water sample collected from monitoring well MW-6 on Apnl 17,1992, MTBE concentrations by EPA Method 8260 contained chlorobenzene and 1 2-dichlorobenzene Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17 1992(past EPA Reference elevation =Elevation relative to mean sea level. recommended holding time),was positive for the following chlorinated hydrocarbons vmylchlonde,cis 1,2 Depth to ground water=Measured from notch/mark on north edge of well casing. dichloroethene trichloroethane and tetrachloroethane These peaks resulted in a positive fuel hydrocarbon result F4#L=Micrograms per liter 'Atypical chromatogram- Four unknown peaks were observed causing a posnuve fuel hydrocarbon result TPPH=Total purageble petroleum hydrocarbons or total petroleum hydrocarbons(TPH)by EPA Method 8015 Modified Chlorinated hydrocarbons are suspected. MTBE.=Methyl tertiary butyl ether by EPA Method 8020 except as noted 'Atypical chromatogram An unknown peak was observed between MTBE and benzene Chlorinated LPH=Liquid phase petroleum hydrocarbons NS=Not sampled hydrocarbons are suspected NA=Not analyzed NM=Not measured NC=Not calculated Oxygenate compounds=sample analyzed for t butanol MTBE di isopropyl ether ethyl tertiary butyl ether and t amyl methyl ether by HPA Method 8260 All analytes were reported below the laboratory detection lurit,except as noted 1 (Page 8 of 8) 93 809 XLS