1. Engineer, PACE Engineers, 1601 Second Ave., Suite 1000, Seattle, WA 98101.
2. Professor and Head, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts Amherst, 224 Marston, Amherst, MA 01003.
3. Research Engineer, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts Amherst, ELab II, MA 01003 (corresponding author).
4. Senior Manager, Regulatory Affairs, Snohomish Public Utility District, 2320 California St., Everett, WA 98206.