1. Senior Project Engineer, Paul C. Rizzo Associates, Inc., 500 Penn Center Blvd., Pittsburgh, PA 15235.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1163 Glenn Martin Hall, College Park, MD 20742.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931 (corresponding author).
4. Senior Scientist, Center for Applied Energy Research, Univ. of Kentucky, 2540 Research Park Dr., Lexington, KY 40511.