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Fig. 2. Farm family conceptual model (from USEPA, 2002b). Contaminants from biosolids applied to farmland are assumed to migrate from the application area along pathways indicated by arrows and by atmospheric deposition. The farm family is then assumed to contact contaminants either in the application area, in secondary media to which contaminants have migrated, and in biota that have contacted and absorbed the contaminants.
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