Cumulative converter station operation 171. The impacts of the predicted noise levels from East Anglia ONE, East Anglia THREE and East Anglia FOUR converter stations at surrounding residential receptors (medium sensitivity) are presented in Table 26.30. The impacts are defined by comparison with impact criteria within section 26.4.6.3.


172. The operational noise emissions from the East Anglia THREE converter station and any subsequent converter stations, are likely to be governed by a similar draft DCO noise requirement to that advised for East Anglia ONE. It is anticipated that the noise of the operational converter station (including transformers, air handling units and cooling fans) will result in an increase in noise in the environment which will not exceed 35dB LAeq, 5 min at Bullenhall Farm, Hill Farm and Woodlands Farm.


173. Separate convertor stations, all assumed to contain identical noise emission sources, would be constructed for each project. Acoustic theory would dictate that the introduction of a second and then a subsequent third identical converter station would represent a potential 5dB increase in the predicted receptor levels, if all three converter stations were operating concurrently at 100% capacity. It is deemed appropriate to use the converter station modelling results obtained in the East Anglia ONE ES as an accurate representation of the noise impact associated with East Anglia THREE, and East Anglia FOUR, and increase the original predicted rated receptor levels by a worst case 5dB for the three stations operating concurrently.


Table 26.30 Predicted converter station operational noise impact (concurrent operation of the


first and subsequent East Anglia Projects) Location Name


Receptor Sensitivity


CS1 CS2


CS3 CS4


CS5 CS6


CS7 CS8


Black Cottage


Woodlands Farm*


Willow Cottage


Bullenhall Farm*


Walnut Tree Farm


Predicted Noise Level


Canes Farm Medium 31 Hill Farm*


Medium 32 Medium 27


Medium 32


Medium 30 Medium 32


Burstall Hall Medium 29 Medium 28


With Tonal Penalty


36 37


32 37


35 37


34 33


Impact magnitude


Low Low


Negligible Low


Low Low


Negligible Negligible


*Subject to the draft 35dB LAeq, 5min noise condition for East Anglia ONE


174. The results show that noise levels would range from a negligible to lowmagnitude on receptors of medium sensitivity and therefore of negligible tominor significance.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 26 Noise and Vibration Page 47


Impact Significance


Minor Minor


Negligible Minor


Minor Minor


Negligible Negligible


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