1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Utah State Univ., 4110 Old Main Hill, Logan, UT 84332-4110.
2. Professor, Dept. of Civil and Environmental Engineering, Utah State Univ., 4110 Old Main Hill, Logan, UT 84332-4110 (corresponding author). Paul.Barr@usu.edu
3. Professor, Dept. of Civil and Environmental Engineering, Utah State Univ., 4110 Old Main Hill, Logan, UT 84332-4110. E-mail: Marv.Halling@usu.edu
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Utah State Univ., 4110 Old Main Hill, Logan, UT 84332-4110. E-mail: M.Maguire@usu.edu