1. Department
of Crop and Soil Sciences, North Carolina State University, 101
Derieux St, Campus Box 7619, Raleigh, North Carolina 26795, United States
2. North Carolina
Department of Environmental Quality − Division of Water Resources, 3800 Barrett Drive, Raleigh, North Carolina 27609, United States
3. Norh Carolina Geological
Survey, 512 North Salisbury Street, Raleigh, North Carolina 27604, United States