PUBLIC HEALTH ASSESSMENT IOWA ARMY AMMUNITION PLANT In this
section, exposure pathways are evaluated to determine whether
people accessing orliving near IAAAP could have been (past
scenario), are (current scenario), or will be (futurescenario)
exposed to installation-related contaminants. In evaluating
exposure pathways,ATSDR determines whether exposure to
contaminated media has occurred, is occurring, orwill occur
through ingestion, dermal (skin) contact, or inhalation of
contaminants. Whenexposure to contaminated media occurs, the
exposure pathway is regarded as "complete." Todetermine whether
completed pathways pose a potential health hazard, ATSDR
comparescontaminant concentrations to health-based comparison
values. Comparison values arecalculated from available
scientific literature on exposure and health effects. These
values,which are defined for each of the different media,
reflect the estimated maximum contaminantconcentration for a
given chemical that is not likely to cause adverse health
effects, g