GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project 12 Figure 8 Proposed WTP Flow and Treatment Infrastructure There are two polishing ponds that currently hold the treated water for approximately 16 hours prior to discharge via multi-port diffusers to the river. This provides time for the treated water to be tested, and the results to be received and checked for compliance prior to the water discharging to the Ohinemuri River. If the water does not meet the discharge criteria, it is recycled back through the plant, used in processing, or pumped back to the TSF. 2.2.1 Operating Regimes and Discharge There are currently five consented operating regimes (RC AUTH971318.01.13). Each operating regime has a range of discharge quality limits that enable compliance with in-stream water quality criteria. Table 1 summarises the current WTP operating regimes included in RC AUTH971318.01.13. Table 1 WTP discharge under various operating regimes Criteria Operating Regime A Operating Regime B Operating Regime C Operating Regime D Operating Regime E Daily Discharge 20,000 m3/d 26,000 m3/d 5,200 m3/d 26,000 m3/d 52,000 m3/d Discharge Rate 235 l/sec 301 l/sec 60 l/sec 301 l/sec 602 l/sec Percentage of river flow 15% 20% 10% 40% 60%
RkJQdWJsaXNoZXIy MjE2NDg3