• Medium: chronic damage to human health (‘significant harm’ as defined in ‘Draft Circular on Contaminated Land’, DETR 2000), pollution of sensitive water resources, significant change in an ecosystem or organism forming part of that ecosystem (note definition of ecosystem in ‘Draft Circular on Contaminated Land’, DETR 2000)
• Mild: pollution of non-sensitive water resources. Significant damage to crops, buildings, structures and services (‘significant harm’ as defined in ‘Draft Circular on Contaminated Land’, DETR 2000). Damage to sensitive buildings, structures or the environment
• Minor: harm, not necessarily significant, but that could result in financial loss or expenditure to resolve. Non-permanent human health effects easily prevented by use of personal protective clothing. Easily repairable damage to buildings, structures and services.
Once the likelihood of an event occurring and its severity have been classified, a risk category can be assigned the table below.
Consequences Severe
Highly likely Likely Very high High Low likelihood Moderate Unlikely
Medium High
Moderate
Mild Moderate Moderate / Low Moderate / Low Low Moderate / Low Low Very Low
Minor Moderate / Low Low Very Low Very Low
Definitions of these risk categories are as follows together with an assessment of the further work that may be required:
• Very high: there is a high probability that severe harm could occur or there is evidence that severe harm is currently happening. This risk, if realised, could result in substantial liability; urgent investigation and remediation are likely to be required.
• High: harm is likely to occur. Realisation of the risk is likely to present a substantial liability. Urgent investigation is required. Remedial works may be necessary in the short term and are likely over the long term.
• Moderate: it is possible that harm could arise, but it is unlikely that the harm would be severe and it is more likely that the harm would be relatively mild. Investigation is normally required to clarify the risk and determine the liability. Some remedial works may be required in the longer term.
• Low: it is possible that harm could occur, but it is likely that if realised this harm would at worst normally be mild.
• Very low: there is a low possibility that harm could occur and if realised the harm is unlikely to be severe.
East Anglia Offshore Wind Limited
Preliminary Risk Assessment, East Anglia ONE Windfarm 41388-PRA(03)
2
Probability
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