Table 10.16. Biotope sensitivities to suspended sediment and smothering within the offshore cable corridor (MarLIN website) level three sensitivities are extrapolated from level four and five biotopes assessments. *


Biotope


Increased suspended sediment SS.SCS.ICS SS.SMx.IMx SS.SSa.IMuSa SS.SMu.ISaMu


SS.SCS.CCS.MedLumVen SS.Smx.CMx.MysThyMx SS.SCS.ICS.HeloMsim SS.SSa.CFiSa.ApriBatPo SS.SSa.CMuSa.AalbNuc SS.Ssa.CFiSa.EpusOborApri SS.SBR.PoR.SspiMx


Sediment deposition SS.SCS.ICS SS.SMx.IMx SS.SSa.IMuSa SS.SMu.ISaMu


SS.SCS.CCS.MedLumVen SS.Smx.CMx.MysThyMx SS.SCS.ICS.HeloMsim SS.SSa.CFiSa.ApriBatPo SS.SSa.CMuSa.AalbNuc SS.Ssa.CFiSa.EpusOborApri SS.SBR.PoR.SspiMx


Tolerance


High High High High


Moderate Recoverability


Very high Very high Very high Very high High


Moderate- Low High Moderate Moderate Moderate Moderate High


High High High High High


High


Moderate High


Very high Moderate


Very high High


Very high


Not relevant High


Moderate- low High Moderate Moderate Moderate Moderate High


High High High High High


Sensitivity


Very low Very low Very Low Very low Low Low Low Low Low Low


Not sensitive


Very low Low


Very low


Not sensitive Low Low Low Low Low Low


Not sensitive * all Biotopes identified in Table 10.15 were also present within the offshore cable corridor


200. When considering biotopes within the offshore cable corridor a worst case medium magnitude, with low value receptors and a low sensitivity can be considered to amount to an impact that is of minor adverse significance in accordance with Table 10.9.


201. At the landfall location the ‘short’ HDD option is considered the worst case scenario as it may cause disturbance of the sediment where trenching and back-filling is


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 1 Introduction Page 67


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