1. Professor, Dept. of Civil & Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910 (corresponding author).
2. Assistant Professor, Institute for Industrial Chemistry and the Ambient Environment, Univ. of Zaragosa, Zaragosa, Spain.
3. Assistant Professor, Dept. of Civil & Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.
4. Research Scientist, Dept. of Civil & Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.