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of Low to High sensitivity respectively. On this basis, indirect impacts arising as a result of scour formation have the potential to result in effects of moderate to major significance. However, the application of embedded mitigation ensures the implementation of buffer zones surrounding known sites thus lowering the likeliness for such an impact to occur. While the potential for scour pits to encroach upon these buffers cannot be discounted, exclusion zones necessarily incorporate a cautionary buffer which should lower the risk of any such encroachment impacting upon the marine archaeological and cultural heritage receptors themselves. As such, the effects of scour formation upon marine and cultural heritage receptors would be regarded as being of minor adverse significance.


191. It is not possible to mitigate impacts to potential receptors through avoidance, only to develop measures to offset or remedy the effect of these impacts if they should occur.


192. As high to low value receptors, the sensitivity of potential in situ prehistoric sites, potential submerged landscape features, potential derived prehistoric finds, potential wrecks, potential derived maritime finds, potential aircraft and potential derived aviation finds and potential palaeoenvironmental evidence is also considered to be high to low respectively (see section 17.6.1). In the absence of appropriate mitigation, the indirect effects of scour formation would result in a moderate to major significance of effect. However, the application of embedded mitigation (section 17.3.3) which incorporates agreed measures to address impacts to potential receptors, if they should occur, reduces the significance of the effects of such impacts to acceptable levels. Consequently, where measures are agreed and implemented, the significance of effects of these indirect impacts upon potential archaeological receptors would be of minor adverse significance.


193. During the detailed engineering stages should it be decided that scour protection be required, effects upon sea bed morphology would be confined to the direct footprint of the scour protection material further reducing this significance. However, this would result in a greater direct impact footprint during the construction phase.


194. Furthermore, information provided by chance discoveries may contribute to a greater understanding of the offshore archaeological resource and is further regarded as beneficial in this respect, assuming that studies are completed to professional archaeological standards and the results produced made publicly available.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 17 Offshore Archaeology Page 92


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