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n <br />Water Quality Monitoring Report <br />Forward landfill <br />4.4.3 Leachate Monitoring <br />Leachate sumps are inspected for the presence of leachate and observations are <br />recorded at least weekly by Forward Landfill personnel. If leachate is detected in a <br />sump it is pumped into the surface impoundment (WMU-F North) for evaporation. <br />During the 2015 monitoring year, leachate was observed at all of the holding areas <br />except WMU D-87 and WMU D-88 A/B and according to the Operations Manager, no <br />leachate was taken off site during the 2015 monitoring year. Freeboard at WMU-F <br />North ranged from approximately 2.58 to 10.92 feet during the 2015 monitoring year. <br />Value Engineering conducted a continuity test of the leachate collection and removal <br />system (LCRS) on August 7 and 8, 2015 at the Forward Unit. The tracer dye test results <br />indicate that continuity is present across the LCRS units WMU-F North, and no excessive <br />leachate is backed up in the drainage layer or sump of the LCRS units. <br />4.5 Austin Unit <br />4.5.1 Groundwater <br />Groundwater elevations measured during the 2015 monitoring year generally reflect <br />seasonal precipitation patterns. Hydrographs depicting historical groundwater <br />elevations are presented in Appendix G and indicate generally static trends with some <br />declines over the past 3 years. During the 2015 monitoring year groundwater flow was <br />generally directed to the north and northeast. <br />Groundwater quality conditions beneath the Austin Unit during the 2015 monitoring <br />year are generally similar to those observed in the previous monitoring year. The <br />following table summarizes inorganic CL exceedances for DMP wells during the 2015 <br />monitoring year. <br />Austin Unit CL Exceedances for 2015 Monitoring Year <br />Well <br />Constituent <br />2015 Monitoring Period <br />AMW-6 <br />Bicarbonate, Calcium, <br />1Q15 <br />Nitrate <br />AMW-6 <br />Bicarbonate, Calcium, <br />2Q15 <br />Magnesium, potassium, <br />strontium, TDS <br />AMW-6 <br />Bicarbonate, Calcium, <br />3Q15 <br />Magnesium, potassium, <br />strontium <br />AMW-6 <br />Bicarbonate, Calcium, <br />4Q15 <br />Magnesium, potassium, <br />strontium <br />M:\ 2015.0014\FA_4Q15.docx 17 <br />1/29/2016, Rev. 0 <br />