ARCHIVED REPORTS XR0003429 - Laserfiche WebLink

Home Browse Search

00*= = = = = = = W = = M M = � �or TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708,2705 COCINTRY CLUB BOULEVARD, STOCKTON,CA Reference Depth to Groundwater Ethyl- Total TPH as Oxygenate Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (feet) (feet) (feet) (µg/L) (µg/L) (µg/L) (j.g/L) (µg/L) (pgIL) W/L) VEW3 03/05/99 NM 703 NC <0 <�0 5 <0 5 <0 5 <50 <2 5 NA (Screened 05/14/99 NM NC NS NS NS NS NS NS NS 3-10 ft bgs) 06/04/99 NM NC NS NS NS NS NS NS NS 08/31/99 NM NC NS NS NS NS NS NS NS 11/23/99 NM IAC NS M NS NS NS NS NS 02/10/00 NM NC NS NS NS NS NS NS NS 05/17/00 NM N( NS N5 NS NS NS NS NS 08/07/00 dry N( NS NS NS NS NS NS NS a=Total volatile hydrocarbons b=Result is an estimated value.because it exceeds the linear range c= A typical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons (hlorinated hydrocarbons are suspected A groundwater sample collected from monitoring well MW6 on 4,1792 contained chlorobenzene and 1 2 dichlorobenzene d=A typical chromatogram Analysis of this sample by LPA Method 624 on 417 92{hast EPA recommended holding time)was positive for the following chlorinated hydrocarbons 4inylchloride,cis 1,2461orocthene irtchloroethane and tetrachloroethane, ]hese peals resulted in a positive tuel hydrocarbon icsult e—A typical chromatogram Nour unknown peaks were observed causing a pnsitrvc lnCI hydrocarbon iesult Chlorinated hydrocarbons are suspected t =A typical chromatogram An unknown peak was observed between MTBL and benzene C hlnnnatcd hydrocarbons are suspected g=A typical chromatogram Analysis of this sample by LPA Method 624 on %pill 17 1992(past EPA recommended holding time),was positive for the following chlorinated hydrocarbons chlorobenzene and 1 2 dichlorobenzene h—MTBE concentrations by EPA Method 8260 i=Unidentified hydrocarbon in the C64-12 range 1= 1,2 Dichloroethane k=I PH as diesel Relercne.e elevation =Llevation relative to mean sea level Depth to groundwater =Measured from notch/mark on north edge of well casing [PH—Total petroleum hydrocarbons by EPA Method 8015 Modified MT BL=Methyl tei ttary butyl ether by FPA Method 8020 Modified,except as noted Oxygcnatc compounds=sample analyzed for ethanol t-butanol,MI BE,di isopropyl cthcr ethyl tertiary butyl cthei,and t amyl methyl ether by LPA Method 8260 All analytes were iepurtcd below the laboratory detection limit except as noted i I t 1projectst737081masterlwplg80013708gu xls Nage 11 of 12