1. Assistant Professor, School of Civil and Construction Engineering, Oregon State Univ., 220 Owen Hall, Corvallis, OR 97331 (corresponding author).
2. CEO, Hart Crowser, 1700 Westlake Ave. North, Ste. 200, Seattle, WA 98109.
3. Senior Associate, Hart Crowser, 1700 Westlake Ave. North, Ste. 200, Seattle, WA 98109.
4. Vice President of Engineering, The Reinforced Earth Company, 8614 Westwood Center Dr., Vienna, VA 22182.
5. Senior Vice President and Chief Engineer, Retaining Wall Services, Inc., 1660 Hotel Circle North, Suite 304, San Diego, CA 92108.