161. As high and medium 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 is also considered to be high to medium. In the absence of appropriate mitigation, direct impacts upon these receptor types as a result of construction activities would result in a major significance of effect. As a low value receptor, direct impacts upon potential palaeoenvironmental evidence would result in a moderate significance of effect. However, the application of embedded mitigation (section 17.3.3) which incorporates agreed measures to address direct 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 direct impacts upon potential archaeological receptors would be ofminor adverse significance in accordance with the criteria set out for impact assessment.
162. The information provided by chance discoveries may also be considered to contribute to a greater understanding of the offshore archaeological resource. As such, unavoidable impacts upon potential archaeological receptors and the data and records produced in mitigating their effects may be regarded as a beneficial effect upon the marine historic environment. However, any positive effect must be demonstrated by the completion of studies to professional archaeological standards, and the results produced would be made publicly available.
17.6.1.2 Impact 2: Indirect Impacts 163. Activities undertaken within the East Anglia THREE site as part of construction works have the potential to alter the prevailing hydrodynamic and sedimentary regimes, resulting in potential indirect impacts upon both known and potential archaeological receptors on or under the sea bed. Such impacts cause effects which afford increased protection to, or deterioration of, archaeological receptors.
164. Impacts resulting in these potential effects as part of construction work include:
Sea bed preparation and the dumping of spoil at the agreed disposal site; Installation of foundations; Installation of cables; and
The deployment of large construction vessels.
165. Changes to the physical baseline environment as a result of the East Anglia THREE site and offshore cable corridor are assessed as part of Chapter 7 Marine Geology,
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 87
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