Scenario 2: open trenching for cables
Direct impacts are anticipated where the route intersects with historic hedgerows and any loss of field boundaries has an impact on the HLC. Reduction of the working width where appropriate to 35m, and the re-instatement of lost hedgerows could mitigate these impacts.
Impact 3: Impacts on the historic built heritage, both direct and indirect
Scenarios 1 and 2
The route has already been selected to avoid known designated heritage assets therefore no direct impacts are anticipated on any Listed Buildings though potential impacts of vibration should be assessed. Vibration impacts are likely to be minimal but may be more extensive under Scenario 2.
Indirect effects to setting may be present at the convertor station location and this would be the same for both scenarios. Embedded mitigation would seek to maximise the use of existing screening and minimal use of reflective materials in the structures would reduce visual intrusion through glare. The converter station footprint is up 2.61ha, and the buildings would be up to 25m high.
Operation
Impact 1: Direct disturbance of buried archaeological remains.
Impact 2: Impacts on historically important hedgerows and the Historic Landscape Character
Impact 3: Impacts on the historic built heritage, both direct and indirect
No further impacts expected during operation. It is anticipated that any on-going maintenance works will lie within the already disturbed footprint.
No further impacts expected during operation. It is anticipated that any on-going maintenance works will use existing access points.
Use of underground cabling rather than overhead pylons removes visual impacts along the onshore cable route. No direct impacts on built heritage expected during operation though continued indirect effects on the setting of designated heritage assets may be present at the convertor station location.
A maximum of 2 kiosks per project may be required at each jointing pit location.
Decommissioning
Impact 1: Direct disturbance of buried archaeological remains.
Removal of cables
It is anticipated that the onshore cable would be decommissioned (de-energised) and trenched cables left in-situ. However, where cables have been installed in pre- installed ducts (future projects) it may prove possible to extract the cables relatively easily during the decommissioning phase. It has been assumed that the jointing pits and ducts would be left in-situ. No significant impacts are anticipated if the cables are extracted providing that any disturbance does not exceed the original footprint.
Preliminary Environmental Information April 2014
East Anglia THREE Offshore Windfarm
Chapter 25 Onshore Archaeology Page 8
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