1. Prof., Dept. of Civ. Engrg., Univ. of Waterloo, Waterloo, Ontario, Canada N2L 3GI
2. Dist. Engr., WMI, Waste Management of Canada, Maple, Ontario, Canada LOJ 1EO
3. Principal, Conestoga-Rovers & Assocs. Ltd., Waterloo, Ontario, Canada N2V 1B4
4. Assoc., Conestoga-Rovers & Assocs., Ltd., Waterloo, Ontario, Canada N2V 1B4