Don't use CLEA to undertake an acute risk assessment - from the
manual .....
The CLEA software is based on the CLEA model. The CLEA model uses
generic assumptions about the fate and transport of chemicals in the
environment and a generic conceptual model for site conditions and
human behaviour to estimate child and adult exposures to soil
contaminants for those potentially living, working, and/or
playing on contaminated sites over long time periods (Environment
Agency, 2008c).
The software allows you to derive assessment criteria and to enter
your own chemical, soil, building or land use datasets. Such criteria can
assist you to assess the risks posed to human health from chronic
exposure to soil contamination in relation to land use. They can be
derived using generic or site-specific assumptions on the characteristics
and behaviour of contaminants, pathways and receptors.
CLEA specifically states it's for chronic exposure rather than acute short
term stuff. I'm not sure how you would undertake an acute
assessment but if its that bad some atmospheric monitoring and dust
sampling might be in order
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