USE OF THE OUTPUT OF A LEAD RISK ASSESSMENT MODEL TO ESTABLISH SOIL LEAD CLEANUP LEVELS

Three general methods to calculate soil contaminant cleanup levels are assessed: the truncated lognormal approach, Monte Carlo analysis, and the house-by-house approach. When these methods are used together wit h a lead risk assessment model, they yield estimated soil lead cleanup levels that may be required in an attempt to achieve specified target blood lead levels for a community. The truncated lognormal approach i s exemplified by the Society for Environmental Geochemistry and Health (SEGH) model, Monte Carlo analysis is exemplified by the US EPA's LEA D Model, and the house-by-house approach is used with a structural equ ation model to calculate site-specific soil lead cleanup levels. The v arious cleanup methods can each be used with any type of lead risk ass essment model. Although all examples given here are for lead, the clea nup methods can, in principle, be used as well with risk assessment mo dels for other chemical contaminants to derive contaminant-specific so il cleanup levels.