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80. 81.


There will be no dewatering required as part of the HDD works and therefore potential impacts to groundwater resources is considered to be negligible.


The release of leachates from landfills or other potentially contaminative materials into either a Secondary A or Principal Aquifers has been considered. Whilst there is potential for significant impacts, mitigation proposed in the assessment would reduce the impact significance tominor adverse.


82.


Crossing points and crossing methodologies (e.g. HDD at main rivers) have been selected to minimise impacts and preserve valuable features as far as possible. HDD will be used to cross all main rivers including the River Deben, Kirton Creek, Martlesham Creek and the River Gipping, avoiding impacts on major watercourses and those of high sensitivity and international value. In general it is considered that works would result in a temporaryminor adverse impact on watercourses. A site visit will be undertaken prior to submission of the final ES and DCO application to confirm the crossing techniques proposed for all other watercourses. The impact assessment will therefore be updated for the ES and DCO application if there are any changes to the current project description.


83.


The storage of potentially contaminative materials would be away from the edge of any watercourses and compliant with Environment Agency Pollution Prevention Guidance (PPG) series and the outline CoCP.


84. A Flood Risk Assessment will be undertaken for the final ES and DCO application.


85. Operationally there is potential forminor adverse impacts dependent upon the maintenance work required. It is anticipated that the impacts during decommissioning would be similar to those identified for construction although likely to be of lower magnitude.


86.


Given that that the three proposed East Anglia Offshore Wind projects will not overlap in terms of construction, cumulative impacts are not considered to be greater than those assessed for construction.


30.3.4 Chapter 22 Land Use 87.


The onshore electrical transmission works would largely cross land in agricultural use. This land is predominantly of low ALC grade (between grades 2 and 3). The majority of the land at the landfall, along the onshore cable route and at the converter station is included under Environmental Stewardship Schemes (ESS). The onshore cable route would also need to cross land drains.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 30 Summary and Conclusion Page 17


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