This document may not be reproduced in full or in part without the written consent of Marshall Day Acoustics Limited Rp 001 R0 20210601 SJP (Waihi North Noise Assessment) ISSUE 33 of 79 7.0 NORTHERN ROCK STACK NOISE CALCULATIONS The NRS is required to accommodate the significant amount of surplus rock created by mining for future re-use as backfill material and constructing TSFs or that is unable to be stored or utilised elsewhere. It will also accommodate non-ore-bearing rock from part of the WUG Access Tunnel. Non-ore-bearing rock from the remainder of the WUG development will be stored at the Willows Rock Stack. The NRS will be located to the north-east of the Processing Plant. Smaller stockpiles will be created around the NRS to accommodate the topsoil that is necessarily stripped during its construction. These smaller stockpiles will be sited and formed to provide additional noise screening for the nearest neighbours wherever practical and would be around 10m in height. The layout is shown in Figure 18. The equipment used in this process will again be typical of mining plant, though with more focus on heavy earthmoving machinery. Development of the NRS will have the effect of bringing the project’s activities closer to existing properties on Golden Valley Road to the north. The closest dwelling not owned by OGNZL is located at 669 Golden Valley Road, approximately 10 metres from the OGNZL site boundary. All other adjacent properties are owned by OGNZL. This dwelling is reasonably distant from the main NRS – approximately 400 metres – and is partially shielded by the intervening terrain. Figure 19 overleaf shows on the lefthand side the NRS construction phase (stockpiling), which will commence prior to the majority of WNP works and features heavy activity in the northern stockpile area. Figure 18 also shows on the righthand side the subsequent operational phase (Main NRS activity). We note that the proposed stockpile then also provides screening of operational noise for the dwelling at 669 Golden Valley Road. As can be seen overleaf, construction noise emissions are just above 50 dB LAeq, which indicates ready compliance with the day-time construction noise criterion given in Section 4. For operational activity, calculated noise levels are below 50 dB LAeq at all relevant receivers and are thus compliant with the operational criterion. While this discussion focusses on the initial construction scenario in 2023, we note that rehabilitation of the land and removal of the stockpiles after 2030 will also generate similar levels of noise. We note that any activity that occurs at night has to meet the much more stringent night-time noise limit of 40 dB. Whilst this noise limit does allow for some activity to be undertaken, it does mean nighttime activity will necessarily be at a much lower intensity in order to comply. Any proposed night-time activity needs to be carefully considered in the NMP, required by the conditions, to ensure compliance. Figure 18: Indicative plan of NRS location and layout
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