1. Project Geotechnical Engineer, Terracon Consultants, Inc., 2201 Rowland Ave., Savannah, GA 31404.
2. Professor, Civil, Environmental, and Architectural Engineering Dept., Univ. of Kansas, 2150 Learned Hall, 1530 W. 15th St., Lawrence, KS 66045-7609 (corresponding author).
3. Associate Professor, Civil, Environmental, and Architectural Engineering Dept., Univ. of Kansas, Lawrence, KS 66045.
4. Professor, Civil, Environmental, and Architectural Engineering Dept., Univ. of Kansas, Lawrence, KS 66045.