1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48824.
2. Groundwater Modeling Specialist, Groundwater Modeling Program, Michigan Dept. of Environmental Quality, Lansing, MI 48909.
3. Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48824 (corresponding author).