1. Assistant Professor, Dept. of Civil and Environmental Engineering, South Dakota State Univ., Brookings, SD 57007 (corresponding author).
2. WJR Northbrook, 330 Pfingsten Road, Northbrook, IL 60062; formerly, M.S. Student, Dept. of Civil and Environmental Engineering, South Dakota State Univ., Brookings, SD 57007.
3. Professor, Chair of the Dept. of Civil and Environmental Engineering, South Dakota State Univ., Brookings, SD 57007.