1. PhD Candidate, School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY 14853; currently, Senior Managing Engineer, Quantitative Environmental Analysis, 800 Brazos St., Suite 1040, Austin, TX 78701.
2. Ripley Professor of Engineering, School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY 14853.
3. Professor, Dept. of Biological and Environmental Engineering, Cornell Univ., Ithaca, NY 14853.