25.4.3.4 Impact Significance 47.
Impacts can arise due to the effects of construction on buried or extant archaeological remains as well as possible impacts during operation. Such effects can be either temporary or permanent. Impacts can also arise as a result of changes to the setting of an historic monument caused by the proximity of new structures, for example noise, dust, vibration or lighting. Where a significant negative effect is identified it may be appropriate to propose suitable mitigation measures in order to reduce the level of impact.
48. Due to the nature of the proposed development,while there may be a potential for direct physical impacts along the entirety of onshore cable route, visual impacts would be largely restricted to the converter station location as the potential impact of the kiosks on visual amenity would be negligible. Visual impact was assessed by comparing the ZTV to the actual views available of the landscape surrounding the converter station location. Heritage assets which could not be demonstrated to share intervisibility were then scoped out of any further assessment, while those identified as potential sensitive receptors were put forward for further detailed assessment. These were assessed in terms of their intrinsic significance and contribution made to that significance by potential impacts upon their setting arising from the proposed development.
49. Once the value of a heritage asset, its sensitivity to the possible impacts of the proposed project and the magnitude of this affect have been determined it is possible to determine the significance of the impact. The matrix below provides a framework around which the significance of the impact was assessed. Such assessment follows criteria set out in national guidelines as well as informed professional judgment.
Table 25.8 Impact Significance Matrix Sensitivity
High High Major
Medium Major Low
Medium Major Moderate Minor Negligible Minor
Magnitude Low
Moderate Minor Minor
Negligible No change Moderate Minor No change
Negligible No change Negligible No change
Negligible Negligible Negligible No change
Uncertain
Uncertain Uncertain Uncertain Uncertain
50.
The impact significance definitions are outlined in Table 25.9 below.
Preliminary Environmental Information April 2014
East Anglia THREE Offshore Windfarm
Chapter 25 Onshore Archaeology Page 20
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