Tier 1 risk assessment Is there a linkage

Alluvium with localised organic material (clay) 

Thin layer of landfill material Gault Clay up to 3 m thick placed over 

Once the source-pathway-receptor scenarios have been identified the risks associated with each one can be assessed qualitatively (i.e. descriptively). Guidance on assigning the likelihood and consequences to the scenarios is given in Tables 6.1-6.3. 

Fairly probable Occurs between once per 10 years and once per year 

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