1. Project Engineer, Lockerbie & Hole, Inc., 53367 Range Rd. 232, Sherwood Park AB, Canada T8A 4V2.
2. Professor, Dept. of Civil and Environmental Engineering, Hole School of Construction Engineering, 3-013 Markin/CNRL, NREF, Univ. of Alberta, Edmonton AB, Canada T6G 2W2 (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Hole School of Construction Engineering, 3-014 Markin/CNRL, NREF, Univ. of Alberta, Edmonton AB, Canada T6G 2W2.