appropriate should plant rating noise levels at residential receptors be greater than 35dB(A) (including a tonal penalty) the actual limit for plant noise would be 35dB(A). The level of 35dB(A) is therefore used within this chapter as the threshold designating a high magnitude of effect when assessing operational noise from the converter station and its effect on the noise environment of a key receptor.
Code of Practice for Noise and Vibration Control on Construction and Open Sites - Part 2: Vibration (BS 5228-2: 2009)
37.
BS5228-2 provides guidance on the control of vibration from construction sites and response limits for cosmetic damage in buildings and provides limits at which the vibration level (measured as a peak particle velocity) would result in cosmetic damage at a range of vibration frequency levels.
38.
BS 5228-2 also presents levels of vibration that may cause complaint, which is predicted to occur between 0.3 mm/s (just perceptible) and 1.0 mm/s (likely to cause complaint). BS 5228-2 values have been taken into consideration in the assessment of vibration levels from construction HGV traffic.
Prediction Methods
On-site construction noise 39.
The assessment of construction noise is predicted utilising a methodology provided by BS5228, and is based on the project description (outlined in Chapter 5 Description of the Development). The plant required for construction would be determined by the contractor selected post-consent and therefore assumed plant has been used in predictions, based on an estimation of noise levels provided by the equipment supplier.
40. Noise level data have been taken from Annex C and D of BS 5228-1: 2009. All sound pressure levels are given at a distance of 10m from the measured plant. Operational time refers to the percentage the equipment is on in an hour when it is deployed on site within working hours and an on time of 75% is assumed, based on Royal HaskoningDHV experience of this type of project.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 13
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