1. Director, Multimedia Environmental Simulations Laboratory, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332 (corresponding author).
2. Senior Research Engineer, 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 Rd., Mail Stop E-32, Atlanta, GA 30333.