1. Department of Civil Geomatics Engineering, California State University, Fresno, California 93740.
2. Schnabel Engineering, Alpharetta, Georgia 30005.
3. Department of Civil and Environmental Engineering, University of South Carolina, 300 Main Street, Columbia, South Carolina 29208. Phone: 803-777-8954; Fax: 803-777-0671; E-mail: flora-joseph@sc.edu
4. Department of Environmental Health Sciences, University of South Carolina, Columbia, South Carolina 29208.