1. Research Associate, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164.
2. Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164 (corresponding author).
3. Research Associate, Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State Univ., Pullman, WA 99164.
4. Associate Professor, Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State Univ., Pullman, WA 99164.
5. Assistant Professor, Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.