Health risk analysis noncarcinogens

Metal Emission Limits. Limits for metals, both carcinogenic and noncarcinogenic, are based on an adjusted stack height. Failure to meet these limits requires risk assessments using site specific factors and modeling to establish limits for each metal. The assessments are based on the probability of developing adverse health effects or cancer, based on an inhalation exposure pathway to maximum exposed individuals located near the incinerator (see Hazard ANALYSIS AND RISKASSESSL nt). 

Screening analysis was conducted for different exposure pathways and chemicals of concern. Using a screening level cutoff of a one-in-a-million excess risk for a 70-year lifetime exposure for the maximally exposed individual (MEI), a set of carcinogenic chemicals was identified for further analysis. For noncarcinogens, MEI exposure levels were compared to health thresholds. If the MEI exposure exceeded the established health threshold, further analysis was done. 

The U.S. Environmental Protection Agency (EPA) divides the health effects of toxic chemicals into two broad categories for risk-assessment purposes risk of noncancer (noncarcinogenic) health effects and risk of cancer (carcinogenic risk) (Chapter 7). The same analysis of exposure is used for both noncarcinogenic and carcinogenic risk however, the relationship of exposure to effect is analyzed differently for noncancer and carcinogenic risks. 

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