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and East Anglia FOUR that would be lost if the entire windfarm were to be built within each habitat (worst case scenario).





Assessment of sensitivities of fish and shellfish species to loss of habitat will be informed by available literature including the assessments available on MarLIN and peer‐review publications.





The impact on key receptors will be considered at the local and population level.


It is recognised that the proposed calculations will present an unrealistic worst case scenario which may lead to exaggerated percentage take figures, however this is the logical way of ensuring that the absolute worst case scenario is considered.


3.3.2.2 Increased suspended sediments and sediment redeposition: 32.


Routine maintenance (discussed above) may increase SSC levels, however this will be localised and temporary and it is anticipated that overall impacts will be lower than for construction.


3.3.2.2.1 Proposed method for assessment 


The information generated by the physical processes chapters will be used to determine the magnitude of sediment redeposition both in terms of the area impacted and the thickness of deposited material.





Assessment of sensitivities of fish and shellfish species will be informed by available literature including the assessments available on MarLIN and peer‐ review publications.





The impact on key receptors will be considered at the local and population level.


3.3.2.3 Operational Noise: 33.


34.


Potential sources of operational noise include vessel movements and wind turbine operation.


Operational wind turbines will produce noise and vibration which will be transmitted into the sea bed and water column (Nedwell et al, 2007). Measurements made at four operational windfarms (North Hoyle, Scroby Sands, Kentish Flats and Barrow) indicate that operational noise is likely to only be a few decibels above background noise within the windfarm, significantly lower in magnitude than noise produced by other activities such as dredging (CMACS 2003, Nedwell et al, 2007). Although in these examples, wind turbines were smaller than those envisaged for East Anglia THREE and East Anglia FOUR.


3.3.2.3.1 Proposed method for assessment Evidence plan Fish and Shellfish Method Statement


East Anglia THREE and East Anglia FOUR Offshore Windfarms


September 2013 Page 32


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