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The goal of this analysis is to provide perspective on what it means when a health-based screening value has been exceeded, and in some cases, how to address specific community health concerns regarding that situation. As depicted in Figure 8-1, the process described in this chapter involves looking more closely at substance-specific information in the context of site exposures. To this point in the public health assessment process-with the exception of knowing the numeric value of the health-based comparison value-no information about the substance(s) of interest has been required. This chapter provides guidance on how to perform the more in-depth analysis needed at sites where, during the exposure evaluation and screening analysis, health hazards have not been ruled out. By now, you have clearly ruled out those pathways and substances that pose no health hazards, and you have retained those requiring more careful examination. In some cases, you have estimated site-specific exposure doses and compared them to health guidelines. As an initial step in the health effects evaluation (described in Chapter 7), you have compared, measured, or modeled exposure point concentrations to ATSDR’s media-specific comparison values. ( Section 8.7) Presenting Findings in the Public Health Assessment DocumentĪs part of the exposure evaluation (described in Chapters 5 and 6), you have identified who might come in contact with environmental contaminants, how those persons might be exposed, and the extent to which might be exposed (over space and time).( Section 8.6) Evaluating Site-specific Health Effects Data.