GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 80 . contaminants that are migrating offsite. Dilution and attenuation in groundwater is also likely to be reducing the contaminant concentrations measured in the groundwater monitoring wells. Figure 4.7 TSF2 and existing northern stockpile underdrains and sampling locations (OGNZL, 2016)
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