||A tiered modeling approach for assessing the risks due to sources of hazardous air pollutants /
Guinnup, David E.
||Environmental Protection Agency, Research Triangle Park, NC. Office of Air Quality Planning and Standards.
|| U.S. Environmental Protection Agency, Office of Air Quality Planning and Standards, Technical Support Division,
Air--Pollution--Mathematical models. ;
Health risk assessment--United States.
Air pollution control ;
Computerized simulation ;
Risk assessment ;
Environmental health ;
Atmospheric diffusion ;
Air pollution effects(Humans) ;
Clean Air Act ;
Pollution sources ;
Hazardous materials ;
Malignant neoplasms ;
Air quality dispersion models ;
Toxic substances ;
Stationary sources ;
Mathematical models ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||vi, 43 pages ; 28 cm
The document provides modeling guidance to support risk assessments as applied to stationary sources of hazardous air pollutants. The guidance focuses on procedures which may be used in support of the petition processes described in Title III of the Clean Air Act Amendments of 1990. The analysis approach described herein is a tiered one, in which each subsequent modeling tier requires additional site-specific information to produce a less conservative estimate of the risk associated with a given stationary source (or group of sources). The modeling approach begins with Tier 1 screening tables which require only source emission rates, stack heights, and nearest fenceline distances to estimate maximum cancer and/or noncancer risks. Tier 2 utilizes additional source parameters (including stack diameter, exit gas temperature and velocity, and nearby building dimensions) with the SCREEN computer program to develop more refined estimates of maximum risks. Tier 3 utilizes site-specific meteorological data, plant layout information, and release frequency data with the TOXST and TOXLT computer models to provide additional refinement to these assessments.
Distributed to depository libraries in microfiche. Shipping list no.: 93-0847-M. "March 1992." "EPA-450/4-92-001." Includes bibliographical references (p. 39-40). Microfiche.