1. PMP, Risk Manager, Enbridge Pipelines Athabasca Inc., 10201 Jasper Avenue NW, Edmonton, AB, Canada T5J 3N7.
2. Professor, NSERC Associate Industrial Research Chair, Ledcor Professor in Construction Engineering, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2 (corresponding author).