1. Dept. of Civil Engineering, Royal Military College of Canada, P.O. Box 17000, Station Forces, Kingston, ON, Canada K7K 7B4; Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montreal, QC, Canada H3C 3A7 (corresponding author).
2. Golder Associates Ltd., 9200, Blvd. de l’Acadie, bureau 10, Montreal, QC, Canada H4N 2T2.
3. Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montreal, QC, Canada H3C 3A7.