Full details of measured noise levels can be found in Appendix 26.1. In summary, with the exception of receptors R7 and R8, the existing LAeq day noise levels at the measurement locations are below the 65dB(A) minimum limit for construction noise assessed in accordance with BS5228. The threshold level for construction noise is therefore 65dB(A) during the day, except at R7 (threshold level of 66dB(A)) and R8 (threshold level of 68dB(A)).
Converter Station Compound 95.
The converter station compound is situated in a quiet, rural area and as such there are few dominant noise sources. During daytime hours, increased traffic levels on the nearby A14 and A1071 make a significant contribution to the ambient and background noise levels. Peak noise levels are generally as a result of individual vehicles passing close to a receptor location, farm vehicles in the fields or noise from animals such as dogs or geese. Whilst it was possible to see the active National Grid Bramford substation from the monitoring positions, including vehicle movements from ongoing construction works, no on-site activity was audible during the measurement times.
96.
At night, the existing Bramford substation is a noise feature in the area, although it is less so during the daytime. Other noise sources include high altitude aircraft, wind in the trees and birds.
97.
Figure 26.2 shows the converter station, with the receptors and monitoring locations highlighted. The following is a description of the receptors and monitoring locations chosen.
Location MP1 – Bullenhall Farm, NGR TM102 466 98.
The daytime monitoring was undertaken on the grassed area immediately to the front of Bullenhall Farm house. The existing substation was not audible at the location, which is in a hollow with no line of sight to the substation. The area was quiet with the dominant noise being from wind in the nearby trees. There was a very distant hum audible from traffic noise. Other noise events that occurred during the monitoring period included: geese (64dB(A)); residents talking; phone ringing; vehicle movements; and high level aircraft (41-45dB(A))
99. Night-time monitoring was conducted on the access lane to the property at the entrance to the yard, approximately 70m from the façade of the property. This location was used at the request and advice of the resident due to the potential for disturbance to them, their dogs and the numerous geese that would create noise if woken. Noise levels at this location were representative of noise levels at the property. During the monitoring period, the noise was dominated by the hum from
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 29
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