GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 83 . in rainwater infiltration to the rock stack for the operational NRS operation scenario, and the predicted recharge through the Zone G & H capping layer for the NRS closure scenario (AECOM, 2020). The proportion of leachate captured in leachate collection drains, captured in sub-soil drains and predicted to discharge to the Ohinemuri River is presented in Figure 4.8. The breakdown of groundwater and leachate captured in the sub-soil drains is presented in Figure 4.9. Rock stack leachate and groundwater flow paths modelled for the NRS operation and NRS closure scenarios are presented in Figure 4.10 and Figure 4.11, respectively. Table 4.4 Predicted leachate capture and leachate seepage through zone A liner Infiltration conditions Leachate captured by leachate collection drains (m3/day) Leachate seepage through Zone A liner (m3/day) NRS Operation 30% rainfall1 29 413 50% rainfall1 109 605 NRS Closure 5-year average cap infiltration (369 mm/year)2 2 262 1. Based on an average annual rate of 2.11 m/year 2. AECOM, 2020. - Considering model uncertainty, results are rounded. Table 4.5 Predicted groundwater and leachate captured in sub-soil drains Infiltration conditions Groundwater captured by sub-soil drains (m3/day Leachate captured by subsoil drains (m3/day) Total sub-soil drains capture (m3/day) NRS Operation 30% rainfall1 744 342 1087 50% rainfall1 736 508 1244 NRS Closure 5-year average cap infiltration (369 mm/year)2 751 212 963 1. Based on an average annual rate of 2.11 m/year 2. AECOM, 2020. - Considering model uncertainty, results are rounded. Table 4.6 Predicted groundwater and leachate captured in sub-soil drains Infiltration conditions Leachate flow to Ohinemuri River (m3/day) NRS Operation 30% rainfall1 71 50% rainfall1 97 NRS Closure 5-year average cap infiltration (369 mm/year)2 49 1. Based on an average annual rate of 2.11 m/year 2. AECOM, 2020. - Considering model uncertainty, results are rounded.
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