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INITIAL RELEASE DDJC Tracy <br /> FIGURE 4 <br /> ATSDR ' s Exposure Evaluation Process <br /> REMEMBER: For a public health threat to exist, <br /> the following three conditions must all be met: <br /> •people must come into contact with areas that have <br /> potential contamination <br /> .Contaminants must exist in the environment <br /> .The amount of contamination must be sufficient <br /> to affect people's health <br /> Are People Exposed Are the Environmental For Each Completed Exposure <br /> To Areas With Potentially Media Contaminated? Pathway,Will the Contamination <br /> Contaminated Media? VVVV Affect Public Health? <br /> For exposure to occur,contaminants ATSDR considers: ATSDR will evaluate existing data <br /> must be in locations where people on contaminant concentration and <br /> can contact them. Sol[ exposure duration and frequency. <br /> Ground water <br /> People may contact contaminants by any Surface water and sediment ATSDR will also consider individual <br /> of the following three exposure routes: Air _ characteristics (such as age, gender, <br /> Food sources and lifestyle) of the exposed popula- <br /> Inhalation tion that may influence the public <br /> Ingestion health effects of contamination. <br /> Dermal absorption <br /> 43 <br />