1. Postdoctoral Fellow, Univ. of British Columbia, Kelowna, BC, Canada V1V 1V7.
2. Okanagan Branch Manager, Kerr Wood Leidal Consulting Engineers, Vernon, BC, Canada V1T 2C8.
3. Assistant Professor, Univ. of British Columbia, Kelowna, BC, Canada V1V 1V7 (corresponding author).