GHD | Oceana Gold (New Zealand) Ltd | 12552081 | Waihi North 18 Table C.4 Minimum and maximum vertical hydraulic gradients – Gladstone Shallow Groundwater System Well Pair Date Water Level Difference (m) Vertical Distance (m) Vertical Gradient (up/down) GLD01 – GLD01a 29/06/17 4.47 4.2 1.1 (down) 5/03/18 0.1 0.02 (down) GLD02 – GLD02a 23/03/18 1.03 14.0 0.07 (down) 10/07/18 0.19 0.01 (up) GLD03 – GLD03a 20/03/18 3.72 9.0 0.4 (down) 27/06/17 0.44 0.05 (down) P79s – P79i 20/03/18 6.91 28.5 0.2 (down) 24/10/17 3.58 0.1 (down) Table C.5 Minimum and maximum vertical hydraulic gradients – Gladstone Deep Groundwater System Well Pair Date Water Level Difference (m) Vertical Distance (m) Vertical Gradient (up/down) P79s – P79d (shallow - deep) 20/03/18 16.22 40 0.4 (down) 07/11/20 9.5 0.2 (down) P79i – P79d (shallow - deep) 20/03/18 9.31 10.5 0.9 (down) 07/11/20 4.95 0.5 (down) GLD01 – GLD01b (shallow - deep) 29/06/17 >30 19.5 > 1.5 (down) GLD01a – GLD01b (shallow - deep) 13/09/17 >29 13.3 > 2.2 (down) P68s – P68d (Shallow to deep system) 2001* (URS, 2003) 0.55 5.0 0.1 (down) 0.72 0.1 (down) P61s – P61 (shallow - deep) 13/10/2020 38.03 32.6 1.2 (down) 2003 (URS, 2003) 38.65 1.2 (down) GLD04s – GLD04d (shallow - deep) 29/10/2020 0.39 52.6 0.007 (up) GLD04i – GLD04d (deep system) 29/10/2020 0.03 36.9 0.0008 (up) * Recent data not available for P68s due to damage to the piezometer.
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