1. Trenchless Practice Leader, Associated Engineering Limited, Edmonton, Alberta,
Canada.
2. Lecturer, School of Geosciences
and Info-Physics, Central South Univ.,
Changsha, Hunan, P.R. China.
3. Assistant Professor, Dept.
of Construction Management, East Carolina Univ., Greenville, NC.
4. Professor and Construction
Engineering Program Chair, School of Sustainable Engineering and the
Built Environment, Arizona State Univ.,
Tempe, AZ (corresponding author).