1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Washington State Univ., Spokane St., Sloan Hall 37, Pullman, WA 99164-2910.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., PO Box 642910, Spokane St., Sloan Hall 41, Pullman, WA 99164-2910 (corresponding author).