1. Environmental Engineer, Cirrus Environmental Services Inc., 10, 1916, 30th Ave. NE, Calgary, AB, Canada T2E 7B2.
2. Professor, Dept. of Civil Engineering, Univ. of Calgary, Calgary, AB, Canada T2N 1N4 (corresponding author).
3. Senior Scientist, NOVA Chemicals Research and Technology Centre, 2928 16th St. NE, Calgary, AB, Canada T2E 7K7.