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 47 of 79 10.0 WNP NOISE LEVELS OVER TIME AND ASSESSMENT 10.1 Calculated Noise Levels Based on the methodology described above, the cumulative noise level from all the various WNP operations (including the WUG) has been calculated for each year of the project operation from 2024 to 2034. The calculated noise levels for each year are shown in the noise contour plots in Appendix D. Results for the 2024 year are shown in Figure 31 overleaf, which also shows the receiver locations referenced below. The calculated noise levels at selected representative receiver locations are shown in Table 18, for each year over the project’s duration. Seven receiver locations are located closer to the WUG activity and are thus reported separately in Table 16. 10.2 Cumulative Effects with Martha operations We have also considered the cumulative noise impacts of WNP in conjunction with currently consented, typical Martha operations. Whilst we note that there is a significant physical separation between WNP sites and Martha, it is still pertinent to understand what cumulative noise impacts may arise. We have prepared a cumulative noise contour plot of this scenario and this is presented below. This shows that there is no material cumulative noise impact. This is primarily due to the distances between WNP and Martha, and the presence of Union Hill. We conclude that generally, residents impacted by Martha would not receive elevated noise levels fromWNP, and vice versa. Therefore cumulative noise impacts are considered reasonable. 10.3 Assessment of Effects As discussed in Section 4.0 the proposed daytime operational noise limit is 50 dB LAeq. This is typical of most District Plan noise limits around New Zealand for residential and rural residential receivers. (We note that there are some districts that do use 55 dB LAeq as well.) The ambient noise levels measured at sites around Waihi show the noise levels are typically 36 to 44 dB LA90 and 43 to 49 dB LAeq. In our opinion, taking these ambient noise levels into consideration, the 50 dB LAeq noise limit represents providing protection to an appropriate level of amenity and the noise effects from the proposed operations would be reasonable. Noise levels at almost all receiver locations not owned by OGNZL would comply with the 50 dB LAeq limit, with a number below 40 dB LAeq. Further, in our opinion because of the existing noise environment in the vicinity of these properties, impacts on amenity would not occur and the existing level of amenity would be maintained. For those receivers where the noise levels without mitigation are above 50 dB LAeq, we reach a slightly different conclusion. Generally though we note that noise levels are only just above 50 dB LAeq. The ambient noise levels in the vicinity of these receivers are at the upper range of those measured in Waihi which goes some way to reduce the impact. Overall, we consider that noise levels received at these properties would have an adverse impact on the level of amenity these properties experience when non-compliant. This is despite exceeding the proposed noise standards by only a few decibels. However, because of the background noise levels that currently exist, and the relatively short-term nature of the noise effects over only a few years this impact on amenity is only slight, and on balance marginal. Nevertheless, to ensure that noise levels would comply with the proposed consent condition noise limits, the required NMP would stipulate the methods to develop appropriate mitigation options prior to operations commencing, that ensure noise limits are complied with. Without this mechanism in place, we consider external noise levels from the project may have had a small adverse impact on amenity (for when the mine is operational), but that once mitigation is implemented through the NMP process to ensure noise levels are compliant with the proposed noise limits, then the noise effects fromWNP would be reasonable. Table 17: WNP Noise levels at each representative receiver location (excluding WUG and additional Gladstone receivers) Receiver (Figure 31) Receiver Address Calculated Noise Level per Year, dB LAeq 2023 2024 2025 2026 2027 2028 2029 2030 2031-34 1 4 Cambridge Road - 34 32 31 30 30 30 29 28 2 41 Seddon Street - 37 35 36 32 32 32 30 31 3 120 Kenny Street - 41 39 38 35 34 34 32 35 4 14 George Street - 48 51 49 46 45 45 40 43 5 19 Clarke Street - 39 39 38 35 35 33 31 34 6 15 Grey Street - 42 40 40 39 39 39 36 38 7 201 Kenny Street - 45 42 42 41 42 41 39 39 8 Waihi East School 36 47 45 44 44 44 44 39 42 9 5 Barry Road - 44 41 42 42 42 42 40 41 10 31 Barry Road 36 46 43 43 42 42 41 39 40 11 55 Barry Road 38 52 51 50 50 50 50 42 46 12 10 Moore Street 38 53 52 52 51 51 50 43 48 13 72 Barry Road 39 54 53 52 51 51 51 44 46 14 43 Mataura Road 38 46 44 43 42 42 42 40 41 15 107 Barry Road 41 48 46 45 44 44 44 42 42 16 33A Heath Road - 51 54 53 50 48 48 43 46 17 35 Heath Road 37 48 47 49 46 45 45 39 42 18 36 Baxter Road - 51 49 48 47 46 46 38 44 19 38 Kingsley Road - 42 41 40 38 39 39 38 33 20 57 Fisher Road - 42 42 43 43 42 42 38 40 21 56 Fisher Road - 43 42 43 42 42 42 36 40 22 36 Fisher Road - 42 42 43 42 41 41 37 38 23 159 Waihi Beach Road - 41 41 41 40 39 40 34 35 24 245 Waihi Beach Road - 44 44 44 41 42 43 31 31 25 45 Trig Road North - 44 44 44 42 42 43 30 31 26 131 Trig Road North - 50 50 50 40 45 49 25 29 27 186 Trig Road North - 45 43 43 38 37 43 27 27 28 223 Trig Road North - 46 43 45 36 37 40 27 28 29 267 Trig Road North - 43 42 42 34 35 39 25 27 30 433 Trig Road North - 36 36 36 35 35 35 32 31 31 549 Trig Road North 33 39 39 39 39 39 39 36 36 32 639 Golden Valley Road 46 48 44 43 42 42 42 46 47 33 654 Golden Valley Road 49 50 47 48 46 47 47 48 49 34 669 Golden Valley Road 52 50 46 45 44 44 44 53 53 Legend: Unmitigated levels, to be reduced by further GOP mitigation requirements enshrined in the NMP Noise level influenced by NRS area construction/rehabilitation activities so is considered compliant with construction noise limits.
RkJQdWJsaXNoZXIy MjE2NDg3