Oceanography and Physical Processes. Those identified as having an impact upon marine archaeological and cultural heritage receptors are associated with changes in bed levels as a result of component installation associated with the windfarm and the offshore cable corridor. The worst case scenario with respect to the deposited sediment layer is associated with foundation installation during the construction phase associated with a 50m basal diameter gravity base structure in water depths of 45 to 49m. Chapter 7 states that worst case changes to bed levels due to foundation installation are likely to result in effects of low magnitude and are confined to a small area (i.e. near-field). Effects further afield are considered to be negligible.
166. On this basis, it could be considered that archaeological and cultural heritage receptors located near-field of installation activities may be subject to minor increased sediment cover. The magnitude of effect is therefore considered to be low.
167. The application of embedded mitigation means that all direct impacts to known receptors would be avoided and, hence, would be negligible.
168. 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.
169. As high value receptors, the sensitivity of potential in situ prehistoric sites, potential wrecks and potential aircraft is also considered to be high. In the absence of appropriate mitigation, indirect impacts upon these receptor types as a result of construction activities would result in a moderate 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 effects ofminor adverse/beneficial significance.
170. As medium value receptors, potential derived prehistoric, potential submerged landscape features and potential derived maritime and aviation finds are considered to have medium sensitivity. As such all indirect impacts to these receptors would result in effects ofminor adverse/beneficial significance.
171. Moreover, as archaeological and cultural heritage receptors subject to greater levels of burial are often afforded higher levels of preservation, it may be considered that in the event of an effect taking place, this may be considered to be beneficial.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 88
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