B-2 – Area 2 - Assessment of Environmental Effects 80 Actual or Potential Effect Recommended Mitigation / Management Recommended Monitoring / Future Action Additional Measures Proposed by OGNZL The Dewatering and Settlement Monitoring Management Plan includes Trigger Action Response Plans so that methods of mitigation to control dewatering and settlement occurrences are suitably adapted to address any deviations from expected conditions. Assessment prepared by EGL (2022) provided in Part H of these application documents. Geochemistry Effects on groundwater/surface water from the placement of rock material to the WRS. The WRS has been designed and will be constructed and operated in a manner consistent with that which currently occurs at OGNZL’s existing facilities, and which has been demonstrated to have been successful for managing and monitoring potential effects. The design will include a range of measures to encapsulate and / or neutralise PAF material, and to contain, collect and treat seepage and runoff from PAF rock. Peer review of the detailed design is required by an appropriately qualified independent party. A WRS Monitoring and Management Plan will be prepared and implemented to monitor and assess the effects of the WRS on the land, ground and groundwater resources and to trigger the implementation of contingency measures where necessary. It includes: Details of groundwater monitoring to detect seepage escaping the underdrainage system; Details of the scan monitoring in both shallow and deep aquifer systems, of water levels, pH, and conductivity; Monitoring details will be included in the WRS Monitoring and Management Plan in accordance with current practice at OGNZL’s existing Waihi TSFs. Monitoring will include groundwater monitoring to detect seepage escaping the underdrainage system. None.
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