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with protected biogenic reefs through micro-siting (section 10.3.3), the impact of increased suspended sediment on S. spinulosa reefs would be negligible.


206. The elevated turbidity and sediment deposition resulting from sea bed disturbance is unlikely to impact other species of interest such as brown shrimp and edible crab as both species are generally considered to not be sensitive to smothering by fine sediment. However, female crabs are more sensitive to the effect of increased sedimentation during sedentary stages of being gravid because their gills could be blocked. Both species are visual feeders and elevated turbidity may affect their foraging ability (Neal 2008).


207. Given the low sensitivity of the receptors and the mediummagnitude of the effect the overall impact of increased suspended sediment on both brown shrimp and edible crab is considered ofminor adverse significance.


10.6.1.2.4Summary of impact 2 208. In summary, the increased suspended sediments caused by the construction of the proposed East Anglia THREE project may cause impacts of up to minor adverse significance in both the East Anglia THREE site and the offshore cable corridor. It is unlikely that there would be any interaction between the two study areas and therefore the overall impact of smothering of benthic habitats and species would be considered to be ofminor adverse significance.


209. There is high confidence in this assessment due to the comprehensive site-specific data available and the detailed study conducted into the levels of increased suspended sediment that would be caused by construction (Chapter 7 Marine Geology, Oceanography and Physical Processes).


10.6.1.3 Impact 3: Re-mobilisation of contaminated sediments 210. Given the absence of contaminants present in the sediments of the East Anglia THREE site and the offshore cable corridor, changes in water and sediment quality due to re-suspension of contaminants have been assessed as negligible (Chapter 8 MarineWater and Sediment Quality). As a result, it is predicted that there would be no impact to the benthic ecology caused by construction of the proposed East Anglia THREE project.


211. Also assessed within Chapter 8 Marine Water and Sediment Quality is the potential for accidental releases or spills of construction materials or chemicals. EATL is committed to ensuring that all vessels would adhere to the requirements of the MARPOL Convention Regulations with appropriate preventative and control measures. Therefore, it is considered likely that there would be no impact to the benthic environment due to accidental releases or spills.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 1 Introduction Page 69


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