of a worst case scenario (i.e. maximum area impacted, the maximum duration of smothering and the maximum thickness of deposited material).
Sensitivities will be informed by available literature including the assessments available on MarLIN and peer‐review publications.
Impacts will be assessed in relation to background SSC levels and natural variations arising from storm events and seasonal changes.
3.3.1.3 Re‐mobilisation of contaminated sediments 25.
Sediment disturbance and subsequent deposition could lead to the mobilisation of contaminants contained in those sediments which are potentially harmful to fish and shellfish species.
3.3.1.3.1 Proposed method for assessment
The magnitude of the potential impact will be based upon the outcomes of Chapter 8 Marine Water and Sediment Quality. The level of magnitude will be assessed based on the maximum levels of contamination within the sites and export cable routes and the maximum amount of sediment disturbance that will occur during construction.
Assessment of sensitivities of fish and shellfish species to contaminants will be informed by review of available literature including the assessments available on MarLIN and peer‐review publications.
3.3.1.4 Underwater Noise 26.
Potential sources of underwater noise include piling, vessel traffic, sea bed preparation, rock dumping and cable installation. Of these, piling noise is considered have the greatest environmental impact (Nedwell et al, 2007, Lindeboom et al, 2011).
27.
Noise from piling during construction (particularly for installation of monopiles) has the potential to cause significant impacts to fish and shellfish species ranging from lethal trauma to behavioural changes in susceptible fish species.
3.3.1.4.1 Proposed method for assessment
The potential for disturbance to spawning/nursery for fish and shellfish receptors will be assessed in relation to the available data on defined spawning locations and the timing and duration of the noise generated by piling events.
The qualification of the magnitude of this impact will be guided by both the results of noise assessments and the findings of the ES chapter that will assess the impacts of underwater noise (Chapter 9 Underwater noise, vibration and EMF).
Evidence plan Fish and Shellfish Method Statement
East Anglia THREE and East Anglia FOUR Offshore Windfarms
September 2013 Page 29
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