1. Civil/Environmental Engineer, Herrera Environmental Consultants, Inc., 2200 Ave., Ste. 1100, Seattle, WA 98121-1820; formerly, Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Washington, 201 More Hall, Box 352700, Seattle, WA 98195-2700.
2. Professor of Civil and Environmental Engineering and Public Affairs, Univ. of Washington, 201 More Hall, Box 352700, Seattle, WA 98195-2700.