Table 32. Management measures to prevent ARD mobilisation
Risks
Controls
Management Measure
ARD material mobilised during western dump reshaping that could impact on receiving environment
∕
Characterise acid generating potential of western dump material prior to construction Establish short term stockpile
∕
Adherence to ARD sampling plan and waste tock management plan ;
∕ ∕
Segregate PAF/NAF material
Implement short term stockpile management strategies in accordance with plans Mandatory inspection and sign-off for foundation preparation, liner installation, fill placement and other critical stages Material verification, compaction testing, installation checks and adherence to design specifications Proper jointing, pressure testing and inspection to avoid rupture and operational errors Adherence to seepage management plan Instrumentation such as piezometers, inclinometers and settlement plates will be included at critical locations to monitoring performance of embankment Piezometer installation and monitoring Groundwater bore installation and monitoring Routine inspections to identify erosion, cracking, seepage, settlement, liner defects and pipeline defects Maintenance and surveillance to be carried out in accordance with OMS manual including operations inspections, routine dam safety inspections, annual dam safety inspections Implement rehabilitation strategy Cap surface and install closure spillway Maintain groundwater and piezometer modelling
∕
∕
∕
∕
ARD material mobilised during TSF operation that could impact on receiving environment
∕
Conduct detailed design that incorporates some PAF material into starter embankment Design upstream geomembrane liner to limit seepage, extend and anchor beyond abutments
∕
∕
∕
∕ ∕
∕
Installation of embankment liner Maintain water return process
∕
∕
∕
ARD material mobilised during TSF closure that could impact on receiving environment
∕
Develop preliminary closure approach consistent with long term stability and seepage controls
∕ ∕
∕
Project number: 25B061
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