1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Western Ontario, London ON, Canada N6A 5B9.
2. Associate Professor, Del E. Webb School of Construction, Arizona State Univ., Tempe, AZ 85287-0204.
3. Site Engineer, BP Canada Energy Company, 1-5105 50th Ave., Whitecourt AB, Canada T7S 1S8.