1. Senior Research Engineer, Multimedia Environmental Simulations Laboratory, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332.
2. Director, Multimedia Environmental Simulations Laboratory, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332.
3. Research Environmental Engineer, Agency for Toxic Substances and Disease Registry, 1600 Clifton Road, Mail Stop E-32, Atlanta, GA 30333 (corresponding author).
4. Consulting Engineer, W.M. Grayman Consulting Engineer, 321 Ritchie Av., Cincinnati, OH 45215.