Operational industrial noise assessment: Method for Rating Industrial Noise Affecting Mixed Residential and Industrial Areas (BS 4142: 1997) and World Health Organisation (WHO) Night Noise Guidelines for Europe (NNG).
32.
BS 4142 provides a methodology for assessing industrial noise against ambient background noise levels. In the context of this assessment BS 4142 provides a methodological framework for considering the impact of the operational phase noise impacts of the project, focussed on the operation of the converter station.
33. A ‘rating penalty’ of 5dB is added to the industrial noise if it contains characteristics that are likely to increase the potential for it to cause annoyance. Such characteristics could include impulses (e.g. bangs/crashes) or tonal components (e.g. hums/whistles etc.). Noise from electricity infrastructure can contain tonal components (the “mains hum”). As such, a 5dB rating penalty has been applied to predicted noise levels from the converter station when assessed to BS4142.
34. A comparison of the difference between the industrial noise level including any rating penalty (the rating level) and the background noise level indicates the likelihood of complaint. The measured background noise level is subtracted from the predicted rating level (not including any contribution from the background level). The greater the difference, the greater the likelihood of complaints arising:
35.
Industrial rating noise level of 10dB or more above the background noise level indicates that complaints are likely;
Industrial rating noise level of approximately 5dB above the background noise level is of marginal significance; and
Industrial rating noise level of at least 10dB below the background noise level indicates that complaints are unlikely.
BS 4142 is not suitable for use in situations where both the industrial rating noise level and the background noise are very low (below about 35 and 30dB(A) respectively). Where this occurs, the World Health Organisation NNG can be used, e.g. for the protection of residential receptors where both the background noise level and predicted industrial noise level are considered very low.
36.
The WHO report provides guidelines and recommendations for health protection. For the primary prevention of subclinical adverse health effects related to night noise in the population, it is recommended that the population should not be exposed to night noise levels greater than Lnight,outside= 40dB during the part of the night when most people are in bed. However, as BS4142 would be considered
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 12
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