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Dual Phase Extraction SystMGroundwater Analytical Data <br /> Parcel 2A-L&M OU <br /> 666 West Weber Avenue,Stockton,CA <br /> HEM I Ethyl- Total <br /> TRPH wISGT TPHg TPHd TPHo Benzene Toluene benzene Xylenes MtBE DIPE ETBE TAME TBA <br /> Date Sampled Sample ID Notes pH (mgly (mglL) (p IL) (p IL (p L) (pglL) (p IL) Il IL) (p IL) p IL) ( L) (pglL) (p L) (p IL) <br /> Noes Continued: <br /> 15 =Surrogate Recovery for method Mod.EPA 8015 was outside of control limits. This may indicate a bias in the analysis due to the sample's matrix or an interference <br /> from compounds present in the sample. <br /> 16 =Matrix Sike/Matrix Spike Duplicate Results for the analyte Tert-Butanol were affected by the analyte concentrations already present in the un-spiked sample. <br /> 18 =Hydrocarbons reported as TPHg are primarily compounds not found in typical gasoline. <br /> 19=Hydrocarbons reported as TPHo are lower boiling than typical motor oil. <br /> 20 =TRPH by EPA Method 418.1 is being phased out due to the use of chlorinated fluorocarbons(CFCs)as the extractable agent.An acceptable replacement method has <br /> been EPA 1664 in which hexane is used as the extractable agent in lieu of CFCs.Hexane extractable materials coupled with silica gel treatment(HEM w/SGT by EPA <br /> 1664)is an accepted replacement analysis for TRPH by EPA 418.1 with the exception that two compounds are only extractable with CFCs that are not extractable with <br /> HEM w/SGT. In addition,according to the City of Stockton MUD discharge permit,received by Stantec on October 28,2008 HEM w/SGT is acceptable. <br /> 21 =EPA Method 524.2 requires the inclusion of a field blank with each set of drinking water samples submitted to the laboratory. No field blank was identified in this <br /> sample set. <br /> 22 =Matrix Spike/Matrix Duplicate results associated with sample GW-INF for the analytes Methyl-t-butyl ether and Tert-Butanol were affected by the analyte concentrations <br /> already present in the un-spiked sample. <br /> 23 =Surrogate Recovery for sample MID-1 for test method Mod.EPA 8015 ws outside of control limits. This may indicate a bias in the analysis due to the sample's matrix <br /> or an interference from compounds present in the sample. <br /> 24 =Matrix Spike/Matrix Spike Duplicate results for the analyte Ml were affected by the analyte concentrations already present in the un-spiked sample. <br /> 25=On August 28,2010 the system was automatically shut down due to the failure of the transfer pump for the first oil-water separator(OWS#1). The system <br /> was restarted on October 4,2010 after repairs and upgrades were Completed. <br /> 26 =OWS#1 was removed from the system treatment train,with the second oil water separator(OSW#2)being the sole oil water separator in operation. <br /> 27=There is no longer a MID-5,due to the removal of OWS#1 from the treatment train leaving six sample ports. <br /> 28=Sample container for HEM w/SGT was not included in 2/10/11 bottle order,sample for HEM w/SGT collected on 2/15/11. <br /> 29=Discrete peaks in Diesel range,atypical for Diesel Fuel. <br /> 30 =Discrete peaks in Motor Oil range,atypical for Motor Oil. <br /> 31 =pH field measured and recorded on Table 1A for this and all subsequent events. <br /> 32 =Hydrocarbons are higher-boiling than typical Diesl Fuel. <br /> 34=Some hydrocarbons lower-boiling,some higher-boiling than Diesel. <br /> 35=Hydrocarbons are lower-boiling than typical Motor Oil. <br /> \\US1345-F03kmrkgmupXI857\acfive\185750217\05_repon_deliv\dwgs_design\tables\O&M Tables 2016\Copy of Parcel 2A OM Tables 1Q16.xlsx Page 3 of 3 <br />