1. Asst. Prof., Dept. of Civ. and Envir. Engrg., Washington State Univ., Pullman, WA 99164-2910.
2. Grad. Res. Asst., Dept. of Civ. and Envir. Engrg., Washington State Univ., Pullman, WA 99164-2910.
3. Assoc. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Wisconsin, 1415 Engineering Dr., 2210 Engineering Hall, Madison, WI 53706.
4. Grad. Res. Asst., Dept. of Civ. and Envir. Engrg., Univ. of Wisconsin, 1415 Engineering Dr., 2210 Engineering Hall, Madison, WI 53706.