21.6.1 Potential impacts during Construction 21.6.1.1 Impact 1: Impacts to Statutory Designated Sites
21.6.1.1.1 Landfall 80.
The landfall lies within the Suffolk Coast and Heaths AONB, although there are no wetland habitats of concern at this location. Therefore, there would be no impact with regards to water resources and flooding.
21.6.1.1.2Onshore Cable Route 81.
Two statutory designated sites, the Deben Estuary Ramsar, SPA and SSSI and Suffolk Coast and Heaths AONB, are crossed by the onshore electrical transmission works and are likely to be affected directly or indirectly by the construction activities.
82.
Under both scenarios, the Deben Estuary,Martlesham Creek and wetland areas of the AONB will be crossed using HDD techniques avoiding direct impact upon the designated areas prior to cable installation therefore there will be no impact. The potential exists for indirect impacts to adversely affect the wetland areas of the AONB through spillages and leakages of contaminative materials, such as oils and fuels. Reference should be made to Table 21.14 for mitigation measures relating to spills and leaks. Further detail is provided in the CoCP as presented in Appendix 5.1.
21.6.1.1.3Converter Station 83.
The converter station does not lie within any designated sites therefore there will be no impact to statutory designated sites.
21.6.1.2 Impact 2: Non-Statutory Designated Sites
21.6.1.2.1 Landfall, Onshore Cable Route and Converter Station 84. Only one non-statutory designated site lies within the study area (Newbourne Springs CGS) approximately 1km south of the onshore electrical transmission works. Due to its distance from the onshore electrical transmission works no impact is anticipated from the construction activities.
21.6.1.3 Impact 3: Impact to Groundwater
21.6.1.3.1 Landfall 85.
The dominant geology at landfall is the Red Crag Formation which is classed as a Secondary A Aquifer. There are no SPZs at the landfall nor are there any licensed private groundwater abstractions. We are awaiting confirmation from the SCDC as to the location of any unlicensed private water supply abstractions with the landfall area. This information will update the impact assessment as part of the final ES. On
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 21 Water Resource and Flood Risk Page 33
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