That was quick
Been pointed at the CLEA FAQ (cheers Nik):
http://www.environment-
agency.gov.uk/subjects/landquality/113813/2021813/2023121/?
version=1&lang=_e
"What is the approach to lead?"
When we update the Health Criteria Values (HCV) and Soil Guideline Values
(SGV) for lead, we will consider setting the HCV as an intake dose, and not a
blood lead level as it was before. This would mean that we can use the CLEA
model to calculate SGV and that you can use the CLEA model for site-specific
risk assessments."
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So they haven't decided yet! - that is so very useful.
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