1. M.S. Student, Dept. of Geosciences, Western Michigan Univ., Kalamazoo, MI 49008-5241.
2. Associate Professor, Dept. of Geosciences, Western Michigan Univ., Kalamazoo, MI 49008-5241 (corresponding author).
3. Principal Technologist, CH2M Hill, 125 South Wacker, Suite 3000, Chicago, IL 60606.