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Young female children aged 1-6 are specified as the critical receptor in the CLEA model. Young children are most at risk via the soil ingestion pathway and I know from experience that they don't play in the garden for only 3 months per year! CLR10 clearly states that young children up to school age are assumed to be at home for 365 days per year and the exposure frequency for soil ingestion pathway is therefore assumed to be 365 days per year (also for the ingestion of indoor dust through hand to mouth contact). Section 4.11 of CLR10 reads "For the standard residential scenario, the critical receptor is assumed to be a young female child with the duration of exposure covering the first six years of life." I don't believe that it is right to make an assumption that a young child will never be allowed in the garden for 9 months out of a year. I'd be interested to know whether such an assumption could be justified for a residential development. Peter Millis Postgraduate Centre for Environmental Research University of Sussex Falmer Brighton BN1 9QJ tel +44 1273 606755 ext 8931 ---------- End Forwarded Message ----------