284. Specifically for the ‘Suffolk Natura 2000’ site, however, parts of the Outer Thames Estuary SPA would be affected, especially within the two separate areas of the SPA that extend offshore from the coasts of Suffolk and east Norfolk (rather than the large area of the SPA which extends offshore into the Outer Thames Estuary from between the counties of Kent and Essex and actually falls within the ‘Kent and Essex Natura 2000’ site).
285. Within these areas of the SPA, either parts of the sea bed are directly crossed by the offshore cable corridor or the boundary of the SPA is immediately adjacent to, or within one tidal excursion distance of, the offshore cable corridor. These situations arise within the most landward 65km of the length of the offshore cable corridor, with no potential for interactions with this SPA (or any other of the identified receptor groups) from the lengths of the offshore cable corridor that are further offshore.
286. Given these aspects, the sensitivity and value of the ‘Suffolk Natura 2000’ site (specifically the Outer Thames Estuary SPA located within) are presented in Table 7.23).
Table 7.23 Sensitivity and Value assessment for the ‘Suffolk Natura 2000’ site Receptor ‘Suffolk
Tolerance
Natura 2000’ site
Negligible Adaptability Recoverability Negligible Negligible Value High Sensitivity Negligible
287. The most inshore (15km) section of the offshore cable corridor is directly coincident with that for the proposed East Anglia ONE project and the section between this limit and the boundary of the East Anglia Zone fully encompasses, and its width extends slightly beyond, that for the proposed East Anglia ONE project. The construction impacts associated with offshore export cable installation for the proposed East Anglia ONE project were previously assessed within the EIA using the Delft 3D plume dispersion model, which also considered locations and rates of change in sea bed level as a result of deposition of material from the sediment plume. Given the small magnitude and relatively localised changes in sea bed level arising from modelling of the offshore export cable installation effects (up to 2mm bed level changes observed within a few hundred metres of the inshore sections of the offshore cable corridor), the EIA concluded that effects on identified receptors would be not significant (comparable to effects of negligible significance using the nomenclature for the East Anglia THREE project).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 57
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