where cumulative construction noise impacts between East Anglia Offshore Windfarm projects would arise. Potential would remain for cumulative impacts to arise as a result of other un-related major infrastructure construction works that may be undertaken during the same time period as East Anglia THREE.
86.
Separate converter stations, all assumed to contain identical noise emission sources would be constructed for each project East Anglia ONE, East Anglia THREE and subsequently East Anglia FOUR. Acoustic theory would dictate that the introduction of a second and then third converter station would represent a potential 5dB increase in the predicted receptor levels, if all three converter stations were operating concurrently at 100% capacity.
87.
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.
Transboundary Impact Assessment 88.
The proposed development is not located close to any international boundaries and there will be no transboundary effects in relation to noise and vibration.
Existing Environment
Noise Survey 89.
As the East Anglia THREE cable connection will feed directly into converter stations adjacent to the East Anglia ONE converter station and the onshore cable route and landfall will be identical, it is deemed appropriate to use the baseline data obtained in support of the East Anglia ONE ES. The noise assessment for East Anglia ONE is summarised below and included in Appendix 26.1.
90.
Attended measurements were conducted at three residential receptors surrounding the proposed converter station location during the day of the 29th September 2011 and early morning on the 30th September 2011. The closest residential receptors identified are isolated houses separated from the site by agricultural land. The three receptors chosen for noise monitoring, and agreed with the local Environmental Health Department, (the nearest three properties) were:
CS2 – Hill Farm House;
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 26
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