Air Compliance Advisor
W. E. Dunn,* D. M. Maloney
U.S. Army, DACA88-96-D-005-05

The Air Compliance Advisor evaluates the cost, performance, and regulatory compliance of various pollution reduction and control strategies. The program was recently adopted by the U. S. Environmental Protection Agency for use nationwide as a pollution control system evaluation and planning tool. The program uses object-oriented data structures and methods to encapsulate the complex algorithms used in estimating emissions and calculating costs so that the user can rapidly prototype and test alternative systems in a fully intuitive manner. The program also provides a knowledge-based set of rules so that the best results are produced given the information currently available.

Determination of Initial Isolation and Protective Action Distances for the North American Emergency Response Guidebook for the Year 2000
W. E. Dunn,* D. F. Brown
U.S. Department of Transportation, DOE ANL 981402401

The North American Emergency Response Guidebook (NAERG), printed and distributed through the United States, Canada, and Mexico, provides first-responders with the information necessary to minimize injury and death following a transportation accident. Our project involves the determination of Initial Isolation and Protective Action distances for the substances listed in the Guidebook that are toxic by inhalation or that may release toxic products upon reaction with water. The values are obtained using the Chemical Accident Stochastic Risk Assessment Model (CASRAM) we developed specifically for this purpose.

Modeling the Dispersion of Fog-Oil Smoke
W. E. Dunn*
U.S. Army, BURNS AND MCDON 97-204

Dispersion of oil smoke in the atmosphere is governed by the action of turbulent air motions coupled with the deposition and evaporation of the oil droplets. This project involves the development of numerical models of dispersion that treats the effects of atmospheric turbulence, droplet deposition, evaporation, terrain and vegetation, and transitional meteorology. The primary model employs a Monte Carlo simulation technique. The results are then used to develop less computationally intensive models for practical use.

National Transportation Risk Assessment
W. E. Dunn,* D. F. Brown
U.S. Department of Transportation, DOE ANL 980072401

The purpose of this study is to quantify the risk to the public associated with the transportation of hazardous materials by highway and rail and to identify the major components of the risk profile to better target regulations and other risk reduction strategies. Hazardous materials of interest include substances that are toxic by inhalation, flammable, or explosive. Stochastic methods are used to obtain complete risk profiles for several key commodities in each of these categories. Factors considered in the analysis include accident probabilities, release rates, transportation mode, and health criteria.