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3.1.9 Groundwater Treatment Facility Operations <br /> The Groundwater Treatment Facility(GTF) at the Austin Unit has been operational since <br /> 1994 to mitigate impacts from landfill releases. At the GTF, contaminated groundwater <br /> is extracted by two wells(EW-1 and EW-2),treated, and discharged to an infiltration <br /> pond. The GTF operated for 2,189 hours between December 27, 2006, and March 31, <br /> 2007, at 96.4 percent uptime, and treated 25.378 million gallons of groundwater at an <br /> average flow rate of 193 gallons per minute, or 0.278 million gallon per day. During this <br /> period, the GTF removed approximately 3.1 pounds of VOCs. <br /> 3.2 SUMMARY <br /> Groundwater quality conditions beneath the Austin Unit during the first quarter 2007 <br /> monitoring period are generally similar to historical results. CLs were exceeded in DMP <br /> wells AMW-6,AMW-7,AMW-13, and AMW-14. However,none of the CL <br /> exceedances exhibited statistically significant increasing trends. In addition, several <br /> statistically significant decreasing VOC trends were calculated in well AMW-14. In the <br /> CAP wells,trend analyses are performed instead of comparison to CLs. During the <br /> current monitoring period, one or more statistically significant increasing trends were <br /> noted for VOC constituents in wells AMW-1,AMW-10, and AMW-19,while decreasing <br /> VOC trends were noted in CAP wells AMW-1 and AMW-11. <br /> The retest results for the annual leachate sample confirmed the presence of mercury in the <br /> leachate sample. Therefore,mercury has been added to the COC list for the Forward <br /> Landfill. <br /> D:\2007_0043\ForwardAustin_w07.doe <br /> 13 Geologic Associates <br />