At what depth should soil samples be collected from for risk assessment purposes?
It is recommended that sampling designs be developed to provide the necessary data for all phases of a clean-up project (e.g., human and ecological risk assessment and remedial design) within one sampling effort to minimize mobilizations whenever feasible. This frequent question response provides recommendations for sampling depth for risk assessment, where the primary objective of the sampling effort is to estimate an average soil lead concentration for use in the IEUBK model. The recommendations made in this FAQ response should be incorporated within the sampling design that is developed for the site. This frequent question response assumes that data on the extent (e.g. depth) of contamination are already available for the site (e.g. from the Site Assessment process) or will be provided pursuant to other objectives of the sampling design. The appropriate sampling depth depends upon the conceptual site model (CSM) and the exposure scenario for the site. There may be more than one expo
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