regulated activities and conservation areas listed in Table 11.31 and shown in Figures 11.64 are implemented.
267. As shown in Table 11.31 there is scope for a temporal overlap with the construction phases of other projects and therefore potential for cumulative impact from increased suspended sediment and sediment re-deposition (section 11.7.1). Due to the distances between East Anglia THREE and other windfarm sites, the rapid plume dispersion and the localised nature of sediment re-deposition, the cumulative impact associated with East Anglia THREE and other windfarm developments is predicted to be no impact.
268. Figure 11.61 illustrates that licenced aggregate dredging sites are at some distance away from the East Anglia THREE site and offshore cable corridor (a minimum of 38km). Furthermore, as stated above, the rapid plume dispersion and the localised nature of sediment re-deposition associated with East Anglia THREE will lead to a minimal contribution to any cumulative effects. As such, the magnitude of the effect is expected to be negligible.
269. As stated above, during the Evidence Plan meetings, sandeels were identified by the MMO, NE and Cefas as being the species of concern in relation to the regional cumulative effects of SSCs and sediment re-deposition. As discussed in section 11.6.2, it is considered that sandeels and their eggs and larvae have high tolerances to SSCs and sediment re-deposition. In view of their limited mobility and substrate dependence, however, their sensitivity is considered to be medium.
270. As the magnitude of effect with aggregate dredging is expected to be negligible, the cumulative impact of increased SSCs and sediment re-deposition associated with East Anglia THREE on sandeels is expected to be of negligible significance. Whist concern was not raised in the respect of other species during consultation, it is assumed that impacts on other species will be no greater than those assessed for sandeels.
11.7.1.3 Underwater noise 271. Any cumulative effect associated with underwater noise would be the result of either spatial or temporal effects, or a combination of both. As discussed above, the primary concern is the effect of piling noise on fish spawning behaviour, particularly on herring, cod and sandeel.
272. Figure 11.62 illustrates the modelled 168dB noise contour of East Anglia ONE and East Anglia THREE and the approximate behavioural noise ranges of other relevant developments within the Southern and Central North Sea in relation to the herring
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 11 Fish and Shellfish Page 84
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