Laserfiche WebLink
� � � � � � IIIIIIIIIII� l� � 1• � � si � >_ � � <br /> • <br /> TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708,2705 COUNTRY CLUB BOULEVARD, STOCKTON,CA <br /> Reference Depth to Groundwater Ethyl- Total TPH as Oxygenate <br /> Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds <br /> Well _Date (feet) (feet) (feet) (µg/L) (�tg/L) (pg/L) (pg/L) _ (}tg/L.) (µg/L) (gg/L) <br /> c=A typical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons Chlorinated hydrocarbons are suspected <br /> A groundwater sample collected from monitoring well MW6 on 4/17/92 contained chlorobenzene and 1,2-dichlorobenzene <br /> d=A typical chromatogram Analysis of this sample by EPA Method 624 on 4/17/92(past EPA recommended holding time)was positive for the <br /> followtng chlorinated hydrocarbons vmylchlonde cis-l,2-dtchloroethene tnchloroethane and tetrachloroethane These peaks resulted in a positive <br /> fuel hydrocarbon result <br /> e=A typical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result Chlorinated hydrocarbons are suspected <br /> f =A typical chromatogram An unknown peak was observed between MTBE and benzene Chlorinated hydrocarbons are suspected <br /> g=A typical chromatogram Analysis of this sample by EPA Method 624 on April 17,1992(past EPA recommended holding time),was positive for the <br /> following chlorinated hydrocarbons chlorobenzene and 1,2-dichlorobenzene <br /> h=MTBE concentrations by EPA Method 8260 <br /> i=Unidentified hydrocarbon in the C6-Ci2 range <br /> i=1,2-Dlchloroethane <br /> k--TPH as diesel <br /> 1=Sample analyzed outside EPA recommended holding time <br /> Reference elevation =Elevation relative to mean sea level <br /> Depth to groundwater =Measured from notch/mark on north edge of well casing <br /> TPH=Total petroleum hydrocarbons by EPA Method 8015 Modified <br /> MTBE-=Methyl tertiary butyl ether by EPA Method 8020 Modified,except as noted <br /> Oxygenate compounds=sample analyzed for ethanol,t butanol,MTBE,di-isopropyl ether,ethyl tertiary butyl ether,and t-amyl methyl ether by <br /> EPA Method 8260 All analytes were reported below the laboratory detection limit,except as noted <br /> NA=Not analyzed <br /> NC=Not calculated <br /> NM=Not measured <br /> N5=Not sampled <br /> pg/L=Micrograms per liter <br /> g%projects1737Wniaster%wplgl14153706gw xls gage 16 of 16 <br />