Table 6: Risk estimation for potentially complete pollutant linkages Potential source
Organic and inorganic contamination within soil and groundwater, associated with:
▪ possible fill materials in former pits;
▪ mineral extraction; ▪ works/depots sites; ▪ railways, tramways; ▪ military bases; and ▪ electricity substations
Potential receptor Adjacent site users
Possible pathway Direct contact
Migration in groundwater followed by direct contact
Vegetation Perched groundwater
Aquifers (including Zone 1 and Zone 2 SPZs and NVZ)
Surface watercourses Buildings and infrastructure SSSI, SPA and Ramsar site
Unexploded ordnance associated with the military base and the decoy pond
Potential contaminated groundwater and leachate from landfill sites
Adjacent site users Buildings and infrastructure Adjacent site users Vegetation Perched groundwater
Aquifers (including Zone 1 and Zone 2 SPZs and NVZ)
Surface watercourses Buildings and infrastructure SSSI, SPA and Ramsar site
Hazardous ground gases associated with landfill sites and gases associated with sewage works
Inorganic and organic contamination associated with sewage works;
Organic contamination associated with slurry lagoons
Adjacent site users Buildings and infrastructure Adjacent site users Vegetation Perched groundwater
Aquifers (including Zone 1 and Zone 2 SPZs and NVZ)
Surface watercourses East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
Root uptake Vertical and lateral migration Vertical and lateral migration Vertical and lateral migration Chemical attack
Vertical and lateral migration in groundwater
Direct contact Direct contact
Migration in groundwater followed by direct contact
Root uptake Vertical and lateral migration Vertical and lateral migration Vertical and lateral migration Chemical attack
Vertical and lateral migration in groundwater
Direct contact Direct contact
Migration in groundwater followed by direct contact
Root uptake Vertical and lateral migration Vertical and lateral migration Vertical and lateral migration Likelihood Likely: neighbours close to route in some locations Low likelihood: possible but not certain that pathway may exist
Likely: vegetation along the route could be affected by soil/groundwater contamination
Likely: presence of shallow perched water extremely likely and any migration of impact will affect this
Likely: construction in areas of contamination could result in migration to aquifers
Likely: due to extent of construction work, it is possible impact will pass into a surface watercourse
Low likelihood: possible but unlikely due to routing of cable away from buildings as far as possible
Likely: route passes through these areas, so mobilisation of contamination will affect them
Low likelihood: presence of unexploded ordnance not considered likely, but possible
Low likelihood: presence of unexploded ordnance not considered likely, but possible
Low likelihood: possible but not certain that pathway may exist
Likely: vegetation along the route could be affected by groundwater contamination
Likely: presence of shallow perched water extremely likely and any migration of impact/leachate will affect this
Likely: construction in areas of contamination could result in migration to aquifers
Likely: due to extent of construction work, it is possible impact from groundwater or leachate will pass into a surface watercourse
Low likelihood: possible but unlikely due to routing of cable away from buildings as far as possible
Likely: route passes through these areas, so mobilisation of contamination will affect them
Low likelihood: unlikely that conditions will occur where gases build up to sufficient levels to be hazardous to human health or able to cause an explosion
Low likelihood: unlikely that conditions will occur where gases build up to sufficient levels to cause an explosion
Unlikely: possible but not certain that pathway may exist
Low likelihood: vegetation along the route could be affected by soil/groundwater contamination
Low likelihood: presence of shallow perched water extremely likely and any migration of impact will affect this
Low likelihood: construction in areas of contamination could result in migration to aquifers
Low likelihood: due to extent of construction work, it is possible impact will pass into a surface watercourse
Severity Medium: potential for damage to human health Medium: potential for damage to human health Risk and justification
Moderate: direct contact with neighbours is possible if contamination is mobilised by this construction project
Moderate/Low: small possibility of contact if contaminated water is mobilised by construction work
Minor: damage to vegetation is not likely to be significant Low: impact to vegetation not likely to be significant
Medium: potential for pollution of sensitive water resources
Medium: potential for pollution of sensitive water resources
Medium: potential for pollution of sensitive water resources
Minor: potential for damage to buildings or structures Medium: potential for damage to sensitive ecosystems
Severe: if encountered, potential for explosions to result in death
Mild: explosion could result in severe damage to buildings or structures
Medium: potential for damage to human health Moderate: potential for impact to sensitive water body Moderate: potential for impact to sensitive water body Moderate: potential for impact to sensitive water body
Very low: low sensitivity of receptor means this is not a significant linkage
Moderate: deleterious impact on sensitive areas is possible if existing contamination is present
Moderate: although unlikely, potential effect is severe, so linkage remains moderately significant
Low: risk is considered low as buildings/structures are repairable should linkage occur
Moderate/Low: small possibility of contact if contaminated water is mobilised by construction work
Minor: damage to vegetation is not likely to be significant Low: impact to vegetation not likely to be significant
Medium: potential for pollution of sensitive water resources
Medium: potential for pollution of sensitive water resources
Medium: potential for pollution of sensitive water resources
Minor: potential for damage to buildings or structures Medium: potential for damage to sensitive ecosystems
Severe: if gases do build up, result could be asphyxiation or explosion resulting in death
Moderate: potential for impact to sensitive water body Moderate: potential for impact to sensitive water body Moderate: potential for impact to sensitive water body
Very low: low sensitivity of receptor means this is not a significant linkage
Moderate: deleterious impact on sensitive areas is possible if existing contamination is present
Moderate: potentially severe outcomes mean that linkage has moderate risk despite low likelihood
Mild: potential for significant harm to buildings/structures Low: low sensitivity of receptor means that linkage has low risk
Medium: potential for damage to human health
Low: small possibility of contact if contaminated water is mobilised by construction work
Minor: damage to vegetation is not likely to be significant Very low: impact to vegetation not likely to be significant
Medium: potential for pollution of sensitive water resources
Medium: potential for pollution of sensitive water resources
Medium: potential for pollution of sensitive water resources
Moderate/Low: potential for impact to sensitive water body
Moderate/Low: potential for impact to sensitive water body
Moderate/Low: potential for impact to sensitive water body
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