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Table 9 Dual Phase Extraction System-Groundwater Analytical Data Parcel 2A-L&M OU 666 West Weber Avenue,Stockton,CA HE Ethyl- Total TRPH WSGT TPHg TPHd TPHo Benzene Toluene benzene Xylenes MtBE ETBE TAME TBA Date Sam led Sample ID Notes H m /L m IL /L /L /L /L /L /L /L /L DIPE /L /L /L /L Notes Continued: 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 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 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 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. 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 sample set. 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 already present in the un-spiked sample. 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 or an interference from compounds present in the sample. 24=Matrix Spike/Matrix Spike Duplicate results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample. 25=On August 28,2010 the system was automatically shutdown due to the failure of the transfer pump for the first oil-water separator(OWS#1). The system was restarted on October 4,2010 after repairs and upgrades were completed. 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. 27=There is no longer a MID-5,due to the removal of OWS#1 from the treatment train leaving six sample ports. 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. 29=Discrete peaks in Diesel range,atypical for Diesel Fuel. 30=Discrete peaks in Motor Oil range,atypical for Motor Oil. 31 =pH field measured and recorded on Table 1A for this and all subsequent events. 32=Hydrocarbons are higher-boiling than typical Diesl Fuel. 34=Some hydrocarbons lower-boiling,some higher-boiling than Diesel. 35=Hydrocarbons are lower-boiling than typical Motor Oil. V:\1857\active\tidewater\185750217_tidewater_stockton_p2a\05_report_deliv\drwgs_designs\tables\O&M Tables 2014\3Q14\Parcel 2A OM Tables 3Q14.xlsx Page 23 of 66