1. Principal Civil and Geotechnical Engineer, Engineering Analytics, Inc., 1600 Specht Point Rd., Suite 209, Fort Collins, CO 80525.
2. Senior Geotechnical Engineer, Engineering Analytics, Inc., 1600 Specht Point Rd., Suite 209, Fort Collins, CO 80525 (corresponding author).
3. Professor Emeritus, Colorado State Univ., Fort Collins, CO 80525; Principal Engineer, Engineering Analytics, Inc., 1600 Specht Point Rd., Suite 209, Fort Collins, CO 80525.
4. Principal Geotechnical Engineer, Engineering Analytics, Inc., 1600 Specht Point Rd., Suite 209, Fort Collins, CO 80525.