CONTENTS


EXECUTIVE SUMMARY ........................................................................................................................ 1 1 INTRODUCTION .............................................................................................................................. 3 1.1 Aims and scope ....................................................................................................................... 3 1.2 Existing reports ........................................................................................................................ 3


2 THE SITE ......................................................................................................................................... 4 2.1 Proposed development ............................................................................................................ 4 2.2 Site location and description .................................................................................................... 4 2.2.1 Landfall ......................................................................................................................... 4 2.2.2 Preferred Onshore Cable Corridor ............................................................................... 4 2.2.3 Converter Station Refined Area of Search .................................................................. 4


3 PRELIMINARY RISK ASSESSMENT (PRA) .................................................................................. 5 3.1 Review of aerial photographs .................................................................................................. 5 3.1.1 Landfall ......................................................................................................................... 5 3.1.2 Preferred Onshore Cable Corridor ............................................................................... 5 3.1.3 Converter Station Refined Area of Search .................................................................. 5


3.2 Ground conditions .................................................................................................................... 6 3.2.1 Soils ............................................................................................................................. 6 3.2.2 Agricultural Land Classification .................................................................................... 7 3.2.3 Geology ........................................................................................................................ 8 3.2.4 Quarrying and mineral extraction ............................................................................... 11 3.2.5 Land stability .............................................................................................................. 12 3.2.6 Landfilling and potential land contamination .............................................................. 12


3.3 Hydrogeology ......................................................................................................................... 16 3.3.1 Aquifer characteristics ................................................................................................ 16 3.3.2 Vulnerability of groundwater resources ..................................................................... 16 3.3.3 Licensed groundwater abstraction ............................................................................. 16 3.3.4 Groundwater Source Protection Zones ..................................................................... 16


3.4 Hydrology ............................................................................................................................... 17 3.4.1 Surface watercourses ................................................................................................ 17 3.4.2 Flood zones................................................................................................................ 17 3.4.3 Discharge consents ................................................................................................... 17 3.4.4 Surface water abstractions ........................................................................................ 18


3.5 History of landfall, Preferred Onshore Cable Corridor and Converter Station Refined Area of Search 18


3.5.1 Landfall ....................................................................................................................... 18 3.5.2 Preferred Onshore Cable Corridor ............................................................................. 19 3.5.3 Converter Station Refined Area of Search ................................................................ 19


3.6 Sensitive land uses ................................................................................................................ 19 3.7 Initial conceptual site model ................................................................................................... 20 3.7.1 Potential contamination sources ................................................................................ 20


East Anglia Offshore Wind Limited


Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)


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