Road Link ID numb er


26 27


Road Link ID Number & name


B1083 B1438


2018 Baseline flows AAWT


Total Vehicles


3,281 12,194


Construction related vibration 50.


Total HGVs


565 1,114


2018 Baseline + Scenario 1


Total Vehicles


3,329 12,719


Total HGVs


609 1,420


2018 Baseline + Scenario 2


Total Vehicles


3,424 13,382


Total HGVs


697 1,808


Ground borne vibration can result from construction works and may lead to perceptible levels of vibration within nearby properties, which can at higher levels cause annoyance to residents. In extreme cases, cosmetic or structural building damage can occur, however vibration levels have to be very high and such cases are rare.


51. High vibration levels generally arise from ‘heavy’ construction works such as piling, deep excavation, or dynamic ground compaction. In comparison, construction of the cable route, landfall and converter stations will generate relatively low levels of vibration. The use of piling, to create foundations for heavy equipment and buildings, during the construction of the converter stations has not been discounted; however there is a large separation distance (c.530m) present between the construction works and nearest receptor at Woodlands Farm.


52.


There is generally a large separation distance between construction works and residential properties at most project locations, with only a small number of properties within 100mof the works. Where properties are located within this distance, the specific receptor distances are deemed large enough to protect receptors from construction related ground borne vibration. It is considered that given the separation distances that ground borne vibration could not be expected to adversely affect receptors. As a result ground borne vibration fromconstruction activities has been scoped out of any further assessment in this PEIR.


53.


Should any discontinuities (e.g. potholes) exist on the roads adjacent to residential receptors or any listed buildings it is considered that there is the potential for vibration levels to exceed the minimum peak particle velocity (PPV) as specified in BS5288-2. However, the road conditions prior to construction are an unknown and therefore the impact from construction vibration is uncertain.


54. A programme of works to develop mitigation in the form of either temporary or permanent fills could be applied where discontinuities (e.g. cracks, potholes) are identified that could result vibration peaks. This programme of works would be developed in discussion with local authority highways engineers


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 26 Noise and Vibration Page 18


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