EXECUTIVE SUMMARY
RSK Environment Limited (RSK) was commissioned by East Anglia Offshore Wind Limited to undertake a Preliminary Risk Assessment (PRA) of contamination impacts for onshore works connected to an offshore windfarm known as the East Anglia ONE Windfarm. This document is a preliminary risk assessment of the land currently under consideration for the Onshore Cable Route (including the landfall
location) and the proposed Converter Station Compound. This document forms Appendix 20.1 to Volume 3, Chapter 20 of the Environmental Statement.
The landfall site is at Bawdsey, near Ipswich, on the coast just north of the River Deben estuary. The Preferred Onshore Cable Corridor passes westwards, crossing the River Deben, and northwards, until it reaches Martlesham, beyond which the route passes in a westerly direction across the north of Ipswich. After crossing the A14 north west of Ipswich the route then travels in a south-westerly direction to reach the converter Station Refined Area of Search near Bamford.
The preliminary risk assessment includes details of soils, geology and agricultural land
classification along the Preferred Onshore Cable Corridor and at the Preferred Converter Station Location. Information is provided as to former and current minerals extraction pits, as well as areas of landfilling and potential land contamination.
The initial conceptual site model for the project indicates a large number of potential
contamination sources, mainly related to disused/infilled pits, landfills and agricultural activities. Close to the landfall historical tramway,
there is also a former RAF station. Other potential sources include a railways, a lime kiln, substations, a decoy pond, sewage works, mineral
extraction sites and slurry lagoons.
Plausible contamination pathways include direct contact, inhalation, migration of contaminants in groundwater, root uptake and chemical attack on infrastructure.
Potential sensitive receptors have been identified to be adjacent site users, vegetation, shallow and deep groundwater, surface water features, buildings and infrastructure. An extensive review of pollutant linkages was undertaken, resulting in the following list requiring further assessment:
• Risk to neighbouring site users from direct contact with organic or inorganic soil/ groundwater contamination, from unexploded ordnance and from inhalation or explosion of hazardous ground gases;
• Risk to perched groundwater from contact with organic or inorganic soil/ groundwater contamination or from landfill leachate;
• Risk to aquifers from contact with organic or inorganic soil/groundwater contamination or from landfill leachate;
• Risk • to surface waters from contact with organic or contamination or from landfill leachate;
Risk to Site of Special Scientific Interest, Special Protection Area and Ramsar site due to contact with organic or inorganic soil/groundwater contamination or landfill leachate.
inorganic soil/groundwater
East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
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