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• - •Groundwater Analytical Data-TTabTotal Petroleum Hydrocarbons and BTEX <br /> South Shore Parcels-Parcel 2A and Adjacent Areas <br /> West Weber Avenue and North Lincoln Street <br /> Stockton,California <br /> Depth <br /> Sam le Ethyl- <br /> p (feet, Date TPHg TPHd TPHk TPHo Benzene Toluene benzene Xylenes <br /> ID bgs Sampled mg/I) m /I) (m /I) /I <br /> Explanations cont.) m m /I m /I mg/1)( (mg/1) <br /> TPHo=Total Petroleum Hydrocarbons in the motor oil range organics <=Below given laboratory detection limit <br /> BTEX=Benzene,Toluene,Ethylbenzene,Xylenes (<50)=Result after the application of silica gel cleanup <br /> '=BTEX By EPA Method 8260B. B=The Method Blank associated with the sample contained 0.11 mg/L TPH as Motor Oil. <br /> "=Sample ID also known as DUP-15P. <br /> =Analyte was detected at a concentration below the reporting limit and above the laboratory method detection limit.Report value is estimated. <br /> =Sample ID also known as W-19-MW1 by Mobile Chem Labs Inc.analytical data and within Applied GeoSystems'Subsurface Environmental Investigation Report dated October 31,1989. <br /> 2=Sample ID also known as W-21-MW2 by Mobile Chem Labs Inc.analytical data and Applied GeoSystems'Subsurface Environmental Investigation Report dated October 31,1989. <br /> 3=Sample ID also known as W-25-MW3 by Chemwest Analytical Labs Inc.analytical data&within Applied GeoSystems'Subsurface Environmental Investigation Report dated October 31, 1989. <br /> °=Sample exhibits fuel pattern that does not resemble standard. <br /> 5=Lighter hydrocarbons contributed to the quantitation. <br /> 6=Heavier hydrocarbons contributed to the quantitation. <br /> r=Sample exhibits unknown single peak or peaks. <br /> s=QA/QC samples collected by Clayton Group Associates. <br /> s=The method reporting limit for TPHd is increased due to interference from gasoline-range hydrocarbons. <br /> 1°=Repeated analysis yielded inconsistent results for TPHg. The highest recovery value of has been reported,but should be considered an estimate. <br /> 11=Matrix Spike/Matrix Spike Duplicate Results for the analyte Benzene were affected by the analyte concentration already present in the un-spiked sample. <br /> "=Samples collected by Clayton Group Services for Unocal:Lincoln/Weber. <br /> 13=The silica gel extract for TPHd contained a slight contamination from the material in the extract vial cap. These compounds were subtracted from the TPH value. <br /> 14=Surrogate recovery for Method 8015 is above/outside the control limit(s). This may indicate a bias in the analysis due to the sample's matrix or an interference <br /> with the surrogate from compounds present in the sample. <br /> 15=The original silica-gel-treated extract for sample MW-11 yielded results that did not appear consistent with the non-silica-gel-treated extract. The sample was re-prepared and re-analyzed. The second <br /> analysis was more consistent,and is the one that has been reported. It was extracted out of hold time,however. <br /> t8=Hydrocarbons reported as TPH as Motor Oil do not exhibit a typical Motor Oil chromatographic pattern. These hydrocarbons are higher boiling than typical diesel fuel,and/or have discrete peaks <br /> which may or may not be petroleum related. <br /> 17=The sample was analyzed by EPA Method 82608 using a bottle that contained a headspace bubble greater than 1/4-inch in diameter. All of the HCI-preserved bottles for this sample <br /> contained headspace bubbles. This can happen with alkaline samples,because the Bicarbonate reacts with HCI to form Carbon Dioxide. <br /> 18=Hydrocarbons reported as TPH as Diesel do not exhibit a typical Diesel chromatographic pattern. These hydrocarbons are higher boiling than typical diesel fuel,and/or have discrete peaks which <br /> may or may not be petroleum related. <br /> 1s=Surrogate recovery for Method 8015 was above the control limit(s). Since there were no Diesel or Motor-Oil range hydrocarbons detected in the sample,no data are Flagged. <br /> 2e=Samples were analyzed by EPA Method 8260B using a bottle that contained a headspace bubble greater than 1/4-inch in diameter. <br /> 21=Sample was re-analyzed to confirm the presence of compounds that were detected in the first analysis. <br /> z2=The Method Blank associated with sample MW-18 contained 81 ug/L TPH as Motor Oil. <br /> z1=Samples collected by Wallace Kuhl for Unocal:Lincoln/Weber. <br /> I:\TldewaterlTW Stockton(Parcel 2A-0415)\Tables\QMR Tables\2008\7Q081Parcel2A(Tables 2,4,5.6,7)Historical GW Tables 1Q08.xls <br /> Page 43 of 44 <br />