GHD | Oceana Gold New Zealand Ltd. | 12552081 | Waihi North Project D-10 Table 9 T Stream East Water Quality Analytes Units Count Minimum Maximum Mean Median Alkalinity - Total g/m3as CaCO3 3 18.2 20.0 18.9 18.5 Aluminium-Dissolved g/m3 1 0.011 0.011 0.011 0.011 Antimony-Dissolved g/m3 1 0.0002 0.0002 0.0002 0.0002 Arsenic-Dissolved g/m3 3 0.0010 0.0010 0.0010 0.0010 Bicarbonate g/m3at 25°C 3 22 24 23 23 Boron-Dissolved g/m3 1 0.008 0.008 0.008 0.008 Cadmium-Dissolved g/m3 1 0.00005 0.00005 0.00005 0.00005 Calcium-Dissolved g/m3 3 3.30 3.80 3.50 3.40 Chloride g/m3 3 8.00 9.00 8.67 9.00 Chromium-Dissolved g/m3 1 0.0005 0.0005 0.0005 0.0005 Cobalt-Dissolved g/m3 1 0.0002 0.0002 0.0002 0.0002 Copper-Dissolved g/m3 1 0.0005 0.0005 0.0005 0.0005 Electrical Conductivity mS/m 3 6.90 7.20 7.00 6.90 Hardness-Total g/m3as CaCO3 3 14.8 17.0 15.7 15.2 Iron-Dissolved g/m3 3 0.02 0.02 0.02 0.02 Lead-Dissolved g/m3 1 0.0001 0.0001 0.0001 0.0001 Magnesium-Dissolved g/m3 3 1.51 1.84 1.67 1.67 Manganese-Dissolved g/m3 3 0.0005 0.0005 0.0005 0.0005 Mercury-Dissolved g/m3 1 0.00008 0.00008 0.00008 0.00008 Molybdenum-Dissolved g/m3 1 0.0002 0.0002 0.0002 0.0002 Nickel-Dissolved g/m3 1 0.0005 0.0005 0.0005 0.0005 Nitrate-N g/m3 3 0.010 0.023 0.019 0.023 Nitrate-N + Nitrite-N g/m3 3 0.010 0.023 0.019 0.023 Nitrite-N g/m3 3 0.002 0.002 0.002 0.002 pH pH units 3 7.2 7.4 7.3 7.2 Potassium-Dissolved g/m3 3 0.96 1.04 1.00 0.99 Sodium-Dissolved g/m3 3 7.60 8.00 7.73 7.60 Sulphate g/m3 3 5.0 5.0 5.0 5.0 Zinc-Dissolved g/m3 1 0.001 0.001 0.001 0.001
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