The adjacent Bramford electricity substation may be a potential source of contamination e.g. from fuels and oils associated with the transformers.
3.3 Hydrogeology
3.3.1 Aquifer characteristics Bedrock along the majority of the Preferred Onshore Cable Corridor is classified as a principal aquifer. The Converter Station Refined Area of Search is underlain by bedrock that is a secondary aquifer, and further small areas of secondary aquifers are present around Akenham and Martlesham.
The superficial deposits are secondary A aquifers around the River Gipping and close to Tuddenham St Martin. A larger extent of secondary A aquifer is present between Playford and Hemley. Very minor areas of secondary B aquifer are present between Playford and Little Bealings.
It is possible that localised perched water may also be present along the Preferred Onshore Cable Corridor and at Converter Station Refined Area of Search, due to the presence of any clay materials, or if any made ground is present.
The presence of low permeability boulder clay at relatively shallow depths in some areas, while restricting downwards migration, may increase the potential for lateral migration of shallow groundwater (and therefore mobile contamination, if present).
3.3.2 Vulnerability of groundwater resources
The groundwater vulnerability classification is mainly high across the Preferred Onshore Cable Corridor, with less extensive areas of intermediate vulnerability.
3.3.3 Licensed groundwater abstraction
A number of licensed groundwater abstractions are present along the Preferred Onshore Cable Corridor, as listed below: • Groundwater abstraction for
the same location as above, with the licence number 7/35/10/*G/0018; and
• Licence held by Blakenham Farms for spray irrigation from water abstracted from the ground, located at 6130 2490 (licence number 7/35/10/*G/0178).
3.3.4 Groundwater Source Protection Zones In terms of aquifer protection,
the EA adopts a three-fold classification of source
protection zones (SPZ) for public supply abstraction wells. • Zone 1 or
‘inner protection zone’ is located immediately adjacent
groundwater source and is based on a 50-day travel time. protect against the effects
contaminants that may have an immediate effect on the source; East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
16 to the It is designed to of human activity and biological/chemical
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