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10.3.3 Embedded Mitigation specific to Benthic Ecology 16. Embedded mitigation relating to the benthic ecology is summarised below:





Careful site selection of the East Anglia THREE site and offshore cable corridor has been carried out to avoid, as far as possible, European designated sites and any proposed Marine Conservation Zones (MCZ).





EATL would conduct pre-construction surveys; these would assess the presence and extent of Annex 1 reef habitats. Appropriate survey methodology would be agreed with the licensing authority, the MMO, in consultation with Cefas and Natural England at the time of survey.


 Micro-siting of foundations and cables would be employed in accordance with the marine licence to avoid Annex I Habitat.





Sea bed disturbance would be minimised by not placing gravity base structures in areas where sandwaves are greater than 5m, therefore reducing the potential for increased suspended sediment, reducing the potential for habitat impact.





The aim would be to bury as much cable as possible therefore reducing the effects of EMF and reducing the need for cable protection and the amount of introduced hard substrate.


 


The use of Horizontal Directional Drilling (HDD) techniques would reduce the potential for impacts at the landfall location.


EATL would commit to use cable protection for a maximum of 2.5% of the export cable to the west of the cable crossing location with the Greater Gabbard Offshore Wind Farm export cables. This ensures that the amount of introduced substrate and permanent habitat loss is limited to relatively small areas.





Best-practice techniques including appropriate vessel maintenance would be used at all times to minimise the potential for contamination as outlined in the International Convention for the Prevention of Pollution from Ships (MarPOL).


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 10 Benthic Ecology Page 17


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