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• Dual Phase Extraction System-Groundwater Analytical Data <br /> Parcel 2A-L&M OU <br /> 666 West Weber Avenue,Stockton,CA <br /> HEM Ethyl Total <br /> TRPH'WSGT TPHg TPHd ' TPHo Benmm Toluene benzene Xylenes IRSE ETBE TAME TBA <br /> Date Samplatl Sample ID Notes pH (mgt)I(oni (ps2) (482) (pg2) I (pg1L) (pglL) (pg2) (pglL) (pglL) DIPE(pg/L) (pg2) (pg/L) (pglL) <br /> Nates Continued <br /> 16=Matrix Sike/Mamx 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 reporled as TPHo are lower boiling than typical motor oil. <br /> 20=TRPH by EPA Method 418.1 is being phased out due to Me 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 susceptible agent in lieu of CFCs.Hexane extractable materials coupled with allies gel treatment(HEM w/SGT by EPA <br /> 1661 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 wit <br /> HEM wi In addition,according to the City of Stockton MUD discharge permit received by Stantec on October 28,2008 HEM wi 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 Spikelk4atdx Duplicate results associated with sample GW-INF for Me analytes Methyl-tbutyl ether and Ten-Butanol were affected by me analyte concentrations <br /> already Present in the en-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=Mal SpikeNatrix Spike Duplicate results for the analyte MtBE were shaded 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 Me transfer pump for the first oil-water separator(OWS iiii The system <br /> was resumed on October 4.2010 after repairs and upgrades were completed, <br /> 26=OWS#1 was removed!from the system treatment can,with the second oil water separator(OSW 92)being the sole oil water separator in operation. <br /> 27=There is no longer a MID-5,due to the removal of OWS 91"in the treatment Main leaving six sample ports. <br /> 28=Sample container for HEM wi was not included in 2/10/11 betim order,sample for HEM wi callacted on 2/1911. <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 Man typical Deal Fuel. <br /> 34=Some hytlr0carbons lower-boiling,some higherboiling than Diesel. <br /> 35=Hydrocarbons are lower-boiling than typical Motor Oil. <br /> V:V 95TadNeaWewa1eN85>5021]litlewater_atacMany2at05_report_tlelivWrwgs_doegretables108M Tables 20151015\Parcel2A OM Tables 1pt 5 dsa Peg.19 of le <br />