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3.1.8 Leachate Monitoring <br /> According to the Operations Manager, no leachate was taken off site during the first <br /> quarter 2012. The leachate collection system, which collects leachate from the north face <br /> of the landfill, has been operational since November 1996. WQPS (concentration limits) <br /> are not required for leachate because it is collected and removed for disposal, rather than <br /> discharged. According to the Operations Manager,the LCRS operated effectively during <br /> the first quarter 2012. <br /> Leachate samples were collected on a monthly basis and analyzed in the field for pH, <br /> specific conductance, and temperature. The results of monthly field monitoring <br /> measurements are presented in Table 3-5. <br /> 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. Currently, impacted groundwater is <br /> extracted from five wells (EW-1, EW-2, EW-3, EW-3R, and EW-4),treated, and <br /> discharged to an infiltration pond. During the monitoring period, the GTF treated <br /> 26,004,700 gallons of groundwater at an average flow rate of 158 gallons per minute, or <br /> 228,098 gallons per day. During the monitoring period, it is calculated that the GTF <br /> removed approximately 2.92 pounds of VOCs. <br /> 3.2 SUMMARY <br /> Groundwater quality conditions beneath the Austin Unit during the first quarter 2012 <br /> monitoring period were generally similar to historical results. CLs were exceeded in <br /> DMP wells AMW-6, AMW-7, AMW-13 and AMW-14, however, with the exception of <br /> the barium and chloride concentrations measured in well AMW-14, no CLs were <br /> exceeded for constituents that exhibited statistically significant increasing trends. It <br /> should be noted, however, that the barium and chloride concentrations measured in the <br /> sample collected from well AMW-14 are within the historical range of values observed at <br /> this well. In the CAP wells, trend analyses are performed instead of comparison to CLs. <br /> During the current monitoring period, statistically significant increasing trends were <br /> noted for three VOCs in CAP wells AMW-1, while several decreasing VOC trends were <br /> noted in CAP wells AMW-1, AMW-4, AMW-5R, AMW-10, AMW-11, and AMW- <br /> 19BR. The increasing cis-1,2-DCE trend in well AMW-1, suggest that active reductive <br /> dechlorination is occurring in the vicinity of this well. <br /> c:\zoiz-oozsFn_iQu.aoc 12 Geo-Logic Associates <br />