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Table 9 <br /> 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 w/SGT TPHg TPHd TPHo Benzene Toluene benzene Xylenes MtBE DIPE ETBE TAME TBA <br /> Date Sampled Sample ID Notes pH (mg/L) (mg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (Ng/L) (pg/L) (pg/L) (Ng/L) (Ng/L) (pg/L) <br /> Definitions: <br /> DIPE =Diisopropyl ether =Not analyzed or not applicable <br /> ETBE =Ethyl tertiary-butyl ether < =Value is less than laboratory reporting limit <br /> lbs =Pounds pH =Concentration of hydrogen ions <br /> ATC =Authority To Construct TAME =Tertiary-amyl methyl ether <br /> BTEX =Benzene,Toluene,ethyl-Benzene,and Total Xylenes TBA =Tertiary-butyl alcohol <br /> PAH =Polynuclear Aromatic Hydrocarbons TPHd =Total petroleum hydrocarbons as diesel(diesel range organics) <br /> GAC =Granular Activated Carbon TPHg =Total petroleum hydrocarbons as gasoline(gasoline range organics) <br /> pg/L =Micrograms per liter TPHo =Total petroeum hydrocarbons as motor oil(motor oil range organics) <br /> mg/L =Milligrams per liter TRPH =Total recoverable petroleum hydrocarbons <br /> MtBE =Methyl tert-butyl ether HEM w/SGT =Hexane extractable material with silica gel treatment <br /> POTW =Publically Owned Treatment Works <br /> Notes: <br /> 1 =System permitted under ATC No.N-4878-1-1. Source test for air board. Extracted groundwater being held in onsite holding tank. <br /> System shut down following source test. <br /> 2 =Source test for air board. System shut down following source test due to on-site excavation activities. <br /> 3 =Wastewater not discharge to sanitary sewer,stored in onsite holding tank. <br /> 4 =Repeat analysis for TPHg yielded inconsistent results,the highest value detected is reported as an estimate. <br /> 5 = System shut down following completion of vapor PAH sample collection. <br /> 6 =Hydrocarbons reported as TPHo do not exhibit a typical Motor Oil chromatographic pattern. <br /> 7 =No sampling due to system not operating.No discharge past 6/3/2005 until 7/6/2005. <br /> 8 =pH sample collected on 10/20/2005 due to exceedance of holding time on pH sample collected on 10/18/2005. <br /> 9 =System offline from 12/7/06 to 5/30/07 for construction.System restarted on 5/21/07and sampled on 5/31/07. <br /> 10 =pH sample tested using standard method SM-4500-HB out of 15 minute holding time. <br /> 11 =Sample analyzed using a bottle that contained a headspace bubble greater than 1/4 inch in diameter. <br /> 12 =Matrix/Spike Duplicate results for the analyte toluene were affected by the analyte concentrations already present in the un-spiked sample. <br /> 13 =Repeated analysis yielded inconsistent results for the analyte ethylbenzene. The concentrations appear to vary between bottles. The highest valid results <br /> are reported. <br /> 14 =Matrix/Spike Duplicate results for the analyte benzene were affected by the analyte concentrations already present in the un-spiked sample. <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 MtBE were affected by the analyte concentrations already present in the un-spiked sample. <br /> 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 <br /> was restarted on October 4,2010 after repairs and upgrades were completed. <br /> I:\Tidewater\TW Stockton(P2A)\Engineering\O&M\Tables\O&M Tables 2013\3Q13\Parcel 2A OM Tables 3Q13.xlsx Page 17 of 18 <br />