138. Table 26.22 shows that most identified receptors may experience effects of a mediummagnitude.
139. It is not considered that other site or off-site mitigation is required for receptors expected to experience low impacts, due to the small exceedance of the construction noise ‘limit’ and the relatively short duration of the impact.
140. For the properties identified in Table 26.20 the construction noise levels were calculated using the same method defined in Table 26.10, however the noise level from both cable installation and HDD works were combined, to obtain the worst case resultant noise level. In reality it is unlikely that these works would be undertaken simultaneously. A range of industry standard and recommended mitigation measures are available to reduce impacts. These are presented in Table 26.18 and will be included in the final Outline CoCP included within the DCO application.
141. BS 5228 states that where a barrier completely screens line-of-sight of a noise source, a reduction of around 10dB can be expected. Any barrier should be of a substantial construction, with no holes or gaps and be approximately 10kg/m2 in density.
142. Table 26.23 presents the residual impacts providing the measures outlined in Table 26.20 are fully implemented.
Table 26.23
Receptor ID
Residual impacts from on-site construction works – assuming 10dBmitigation Property
Noise from cable installation dB LAeq 12hr
NSR1 NSR2 NSR3
NSR4 NSR5 NSR6
NSR7
Low Farm Dukes Hill
Cherry Tree Farm
Glebe Farm
Copenhagen Cottage
Bullenhall Farm
63 59 62
61
The Common 63 64
55
Noise from major HDD dB LAeq 12hr ---- 52
---- ----
56 ---- 48
Total Noise dB LAeq,12h
Residual Magnitude
Impact Significance
63 60 62
61 64 64
56
Negligible Negligible Negligible
Negligible Negligible Negligible
Negligible
Negligible Negligible Negligible
Negligible Negligible Negligible
Negligible
143. Table 26.21 demonstrates that residual negligible impacts are predicted at all receptors close to the cable route.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 37
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