GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 73 8 RECOMMENDATIONS This section outlines recommended surface water quality and flow monitoring requirements for the Waihi North Project. Recommendations are centered on the two main receiving surface water bodies : Ohinemuri River (the WTP discharge and downstream of the site discharge) and Mataura Stream; and also Wharekirauponga Stream (located above the WUG Mine). Ohinemuri River. OCGNZL currently hold Waikato Regional Council (WRC) resource consent (RC) no. 971318.01.13 to allow the discharge of treated water from the Water Treatment Plant into the Ohinemuri River. WTP discharge monitoring within this consent currently requires water quality monitoring based on the schedule as outlined in Table 16. Table 16 WTP Discharge and Ohinemuri River Monitoring (currently consented) Frequency Site Parameters Continuously WTP Discharge Flow (at both discharge sites), turbidity, conductivity, pH, temperature Frendrups Torrens (Ruddocks) Flow, temperature Daily WTP Discharge Cyanide (WAD), copper, iron, manganese, suspended solids, ammoniacal N, silver Weekly WTP Discharge Ohinemuri River (at location OH5 for discharges at point E1, and location OH6 for discharge at point E2) Selenium, Antimony Monthly WTP Discharge Parameters listed in condition 14, Table1. (TSS, nickel, zinc, arsenic, mercury, cadmium, chromium (VI), lead, hardness) Annual WTP Discharge Cobalt It is recommended that the conditions as outlined in Table 16 are updated for the Waihi North Project to reflect the increased volume of treated water discharging to the Ohinemuri River as outlined in Table 17 (highlighted cells indicate recommended changes). Table 17 WTP Discharge and Ohinemuri River Monitoring (recommeded) Frequency Site Parameters Continuously WTP Discharge Flow (at both discharge sites), turbidity, conductivity, pH, temperature Frendrups Torrens (Ruddocks) Flow, temperature Daily WTP Discharge Cyanide (WAD), copper, iron, manganese, suspended solids, ammoniacal N, silver Weekly WTP Discharge TSS, nickel, zinc, arsenic, mercury, cadmium, chromium (VI), lead, hardness, sulphate, selenium, antimony
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