1. PhD Candidate, School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY 14853; presently, Project Manager, Quantitative Environmental Analysis, LLC, 800 Brazos St., Ste. 1040, Austin, TX 78701.
2. J. P. Ripley Professor, School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY 14853.