203. However, the immediate application of agreed measures to deal with such impacts if they should occur, as set out as embedded mitigation (section 17.3.3) and within the WSI are expected to adequately address the effect of such impacts.
204. Significant impacts have been evaluated according to defined parameters expressed as a matrix which sets receptor value against magnitude of effect.
205. The application of embedded mitigation means that all direct impacts to known receptors would be avoided and, hence, would be negligible.
206. Assuming that provision is made for methods of removal which minimise further impact to a wider area, direct impacts to potential archaeological receptors from the removal of foundations, scour protection or cables during decommissioning would be not significant.
207. 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. In the absence of appropriate mitigation, direct impacts upon these receptor types as a result of the use of jack-up crane vessel and / or anchors of other vessels deployed during decommissioning 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, as long as the agreed measures are 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.
208. As discussed in relation to direct impacts associated with construction and maintenance activities above, unavoidable impacts upon potential archaeological receptors and the data and records produced in mitigating their effects may be regarded as a beneficial effect in contributing towards a greater understanding of the offshore archaeological resource. However, any positive effect must be demonstrated by the completion of studies to professional archaeological standards, and the results produced must be made publicly available.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 94
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