www.valenza-engineering.com 381_R_04_Rev 0 OGNZL_WUG_Phase1_Conceptual_Mitigation 30 6. Conduct probing and hydraulic testing before and during the development of the tunnel and mined area to confirm the zone and sequence of water management measures. Install operational instrumentation. 7. Conduct pre-development grouting and depressurisation and activate TARPs and OM framework developed in Phase 2. This phase of work corresponds to the implementation of TARPs, where the grouting is implemented when trigger levels in the periphery of the mine void are exceeded until the instrument readings stabilise. Phase 4: Installation of operational monitoring and implementation of ongoing mitigation measures. 8. Conduct progress grouting and drainage within tunnels and drive. If confirmed by modelling, complete localised depressurisation and grouting of the upper horizons of the mine before mining. Analyse monitoring data and adapt measures progressively. 9. Once pathways are sealed at a sufficient level, implement dewatering measures (deep hole dewatering, sump pumping), drainage and depressurisation. 10. Apply a progressive (P) modelling (M) and mitigation measures design (D) and implementation (I) strategy consistent with the TARPs and the OM framework. Monitor impact and conduct secondary and tertiary grouting from UG infrastructure as required.
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