175. Without mitigation the predicted noise level of all three converter stations operating concurrently at will potentially give rise to an exceedence of the 35dB LAeq 5min at Bullenhall Farm, Hill Farm and Woodlands Farm. All three projects will commit to a requirement not to exceed 35dB LAeq 5min at Bullenhall Farm, Hill Farm and Woodlands Farm. Detailed mitigation for each project will be set out in an operational Noise and Vibration Management Scheme to be agreed with the Local Authorities. Measures likely to be considered as part of these schemes will involve:


  





Selection of quieter equipment; Installation of acoustic enclosures;


Installation of acoustic barriers (fire walls may be required around the Converter Transformers, which may provide some acoustic benefit);


Possibility to screen converter stations further by the construction of a landform/embankment around the site, which will protect against flooding and may also provide up to 10dB attenuation;


 


Silencing of exhausts/outlets for air handling/cooling units; and


Locating equipment to take advantage of screening inherent in the design, i.e. from the converter hall or control room buildings


Inter-relationships


176. In order to address the environmental impact of the proposed development as a whole, this section summarises the inter-relationships between noise receptors and other physical, environmental and human receptors (Table 26.31). The objective is to identify where the accumulation of effects on a single receptor, and the relationship between those effects, may give rise to more significant impact than those effects in isolation which may, in turn, result in a need for additional mitigation.


Table 26.31 Inter-relationship


Inter-relationships relevant to the assessment of noise impacts Linked Chapter


Section where addressed


Influence of construction air quality on local amenity


Influence of local footpath closures during construction on local amenity


Influence of construction traffic on local amenity


Section 26.5, 26.6, 26.7


Section 26.5, 26.6, 26.7


Section 26.5, 26.6, 26.7


Chapter 20 Air Quality Chapter 22 Land use Chapter 27 Traffic and Transport


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 26 Noise and Vibration Page 48


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