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Page 2 of 2 <br /> Table 6 <br /> Groundwater Treatment System Performance Data <br /> ARCO Station 9595 <br /> 6104 North Highway 99 <br /> Stockton CA <br /> Influent Concentrations Midpoint Concentrations Effluent Concentrations <br /> Average <br /> Totalizer Monthly Discharge TPH as Ethyl TPH as Ethyl TPH as Ethyl <br /> Date Value Volume Rate Gasoline Benzene Toluene benzene Xylenes TBA MtBE 1 2 DCA Gasoline Benzene Toluene benzene Xylenes TBA MtBE 12 DCA Gasoline Benzene Toluene benzene Xylenes TBA MTBE 1 2-DCA <br /> Sampled aeons allons L L !L L !L !L !L L L L L <br /> Definitions Notes <br /> pg/L=Micrograms per liter a System startup on Apnl 8 2002 <br /> gpm=Gallons per minute b System switched to the Carbon B vessels <br /> gal=Gallons c Carbon changed in the Carbon B vessels <br /> TPH=Total petroleum hydrocarbons d Carbon changed in the Carbon A vessels <br /> TBA=Tert-butyl alcohol a Sample results incongruent May have been swapped or cross contaminated Received November 17 2003 at 5 33 p m <br /> MtBE=Methyl ten-butyl ether f Effluent confirmation sample Colleted <br /> 1 2-DCA=12 Dlchlomethane g System switched to the Carbon B vessels Approximately 5 000 to 6 000 gallons were first flushed through the vessels between 14 00 a m and 3 00 p m Wienerschnitzel <br /> =Not Sampled or Not Available swlthed to AoroPure water during flushing of Carbon B vessels and switched back to the municipal well water treated through the fresh carbon B vessels at 3 15 p m <br /> h Carbon change-out in Carbon A vessels System was switched to AeroPure water during change-out and back to the Carbon B vessels when complete <br /> i Confirmation sample collected <br /> System and flow monitored weel l I System on AeroPure water until bacteria samples confirmed <br /> I IARCM59MTaWwe SCWTable 6 Grour dx ter Treatmere System Perfo manx Data tls <br />