99.
Within the new access routes any adverse impact to buried archaeological features would be permanent and irreversible in nature. Although overall the scale of the impact is substantially reduced from Scenario 2 the magnitude of impact on an individual asset may still be high. However as part of the embedded mitigation strategy East Anglia THREE would commit to a Written Scheme of Investigation (WSI) in line with that proposed for the East Anglia ONE development. This ensures that all potential buried archaeological remains would be identified and mitigation measures for their preservation in situ or recording implemented. As a result any impact will be reduced tominor adverse or negligible.
25.6.2.1.2 Scenario 2: Trenching 100. Without appropriate mitigation, direct impacts could occur on potential buried archaeological remains during intrusive groundworks in relation to this scenario. Any adverse impact to buried archaeological features could be permanent and irreversible in nature. As part of the embedded mitigation strategy East Anglia THREE would commit to a Written Scheme of Investigation (WSI) in line with that proposed for the East Anglia ONE development. This ensures that all potential buried archaeological remains would be identified and mitigation measures for their preservation in situ or recording implemented. As a result any impact will be reduced tominor adverse or negligible.
101. Where uncertainty about the presence or significance of the potential archaeological resource exists this WSI would allow the presence and nature of any archaeological features or deposits to be confirmed and where they would be adversely impacted allow for their preservation by avoidance, change in construction techniques or archaeological recording. Consequently, though the value and sensitivity of a particular asset may be currently uncertain the impact significance would in all circumstances be minor adverse or negligible.
102. HDD is expected to be utilised at 8 locations, in particular crossing points with rivers, major roads and railway lines. While substantial disturbance of buried archaeological remains within the footprint of roads and railway line will have already occurred, the use of HDD at river crossings will minimize the impact to any potential preserved palaeoenvironmental material.
25.6.2.2 Impact 2: Field Boundaries and Historic Landscape Character
25.6.2.2.1 Scenario 1: Ducting 103. There will be some direct effects during the construction phase on a number of historic field boundaries and hedgerows, though the scale of this will be reduced for this scenario. The loss of hedgerows and field boundaries can be considered to
Preliminary Environmental Information April 2014
East Anglia THREE Offshore Windfarm
Chapter 25 Onshore Archaeology Page 30
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