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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
� mild: no appreciable damage to human health, exposure to hazardous substances likely to
result in limited, not reportable health effects and below workplace exposure limits. Pollution
of non-sensitive water resources (low-level pollution of a principal aquifer outside a
groundwater source protection zone and industrial agricultural abstraction). Significant
damage to buildings and foundations but not resulting in the buildings being unsafe for
occupation and damage to services but not sufficient to impair their function. Harm to crops
but not resulting in a substantial loss in value or diminution in yield (less than 20% reduction),
limited harm to livestock, domesticated animals or wild animals; and
� minor: non-permanent harm to human health (easily prevented by means such as personal
protective clothing). No appreciable pollution of a water resource. Easily repairable damage
to buildings, structures and services. No appreciable harm to livestock, domesticated and
wild animals, crops and domestically grown produce.
7.36 The land contamination risk, which is a function of the probability and the consequence, can then
be defined using the risk matrix in Table 7.1, which is taken from R&D 66 48 .
Probability
High
Likelihood
Table 7.1 Risk Estimation based on Probability and Consequence
Consequence
Severe Medium Mild Minor
Very High Risk High Risk Moderate Risk Moderate Low
Risk
Likely High Risk Moderate Risk Moderate Low
Risk
Low
Likelihood
Unlikely Moderate Low
Risk
Moderate Risk Moderate Low
Risk
7.37 Descriptions of the classified risks given in R&D 66 48 are as follows:
Low Risk
Low Risk Very Low Risk
Low Risk Very Low Risk Very Low Risk
� very high risk: there is a high probability that severe harm could arise to a receptor from an
identified hazard without remediation action or there is evidence that severe harm to a
receptor is already occurring. Realisation of that risk is likely to present a substantial liability
to the site owner or occupier. Investigation is required as a matter of urgency and
remediation works are likely to follow in the short term;
� high risk: harm is likely to arise to a receptor from an identified hazard without remediation.
Realisation of the risk is likely to present a substantial liability to the site owner or occupier.
Investigation is required as a matter of urgency to clarify the risk. Remediation works may be
necessary in the short term and are likely over the longer term;
� moderate risk: it is possible that harm could arise to a receptor from an identified hazard.
However, it is either relatively unlikely that any such harm would be severe and if any harm
was to occur it is more likely that the harm would be relatively mild. Further investigative work
is normally required to clarify the risk and to determine the potential liability to site owner
occupier. Some remediation works may be required in the longer term;
5100935.404 Environmental Statement August 2011 97