1. Associate Professor, Dept. of Civil Engineering, Univ. of Colorado Denver, Denver, CO 80217 (corresponding author).
2. Associate Professor, Dept. of Construction Management, Colorado State Univ., Fort Collins, CO 80523.
3. Lecturer, Univ. of Technology, Kingston, JM JMAKN04.
4. Assistant Professor, Dept. of Civil Engineering, Colorado State Univ., Fort Collins, CO 80523.