Potential source
Potential receptor Buildings and infrastructure
SSSI, SPA and Ramsar site
Possible pathway Chemical attack
Vertical and lateral migration in groundwater
Likelihood
Unlikely: possible but unlikely due to routing of cable away from buildings as far as possible
Low likelihood: route passes through these areas, so mobilisation of contamination will affect them
Severity Minor: potential for damage to buildings or structures Medium: potential for damage to sensitive ecosystems
Risk and justification
Very low: low sensitivity of receptor means this is not a significant linkage
Moderate/Low: deleterious impact on sensitive areas is possible if existing contamination is present
All pollutant linkages detailed in the table above have been allocated risk classifications. For the project under consideration, no risks of high or very high were identified. The potential pollutant linkages with a risk of moderate, and therefore requiring further consideration, are:
1. Risk to neighbouring site users from direct contact with organic or inorganic soil/groundwater contamination; 2. Risk to perched groundwater from contact with organic or inorganic soil/groundwater contamination; 3. Risk to aquifers from contact with organic or inorganic soil/groundwater contamination; 4. Risk to surface waters from contact with organic or inorganic soil/groundwater contamination; 5. Risk to SSSI, SPA and Ramsar site due to contact with organic or inorganic soil/groundwater contamination; 6. Risk to neighbouring site users from unexploded ordnance; 7. Risk to perched groundwater from contaminated groundwater or landfill leachate; 8. Risk to aquifers from contaminated groundwater or landfill leachate; 9. Risk to surface watercourses from contaminated groundwater or landfill leachate; 10. Risk to SSSI, SPA and Ramsar site due to contact with contaminated groundwater or landfill leachate; and 11. Risk to neighbouring site users from inhalation or explosion of hazardous ground gases.
Further work should be undertaken to assess these linkages to determine whether the source, pathway and receptor are all present, and whether the linkage is likely to be complete or not.
It should be noted that there is a potential risk from unexploded ordnance around the RAF station and decoy pond during site investigation and construction work. Due to the agricultural nature of most of the land, it it is unlikely that there will be a risk from unexploded ordnance during any site walkovers that will be undertaken.
East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
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