1. Project Engineer, CBCL Ltd., 1489 Hollis St., Halifax, NS, Canada B3J 3M5.
2. Postdoctoral Fellow, Dept. of Civil and Resource Engineering, Dalhousie Univ., 1360 Barrington St., Halifax, NS, Canada B3H 4R2.
3. Professor, Dept. of Civil and Resource Engineering, Dalhousie Univ., 1360 Barrington St., Halifax, NS, Canada B3H 4R2 (corresponding author).