Affiliation: | Department of Civil, Construction and Environmental Engineering, Oregon State University, Corvallis, OR 97331, (541) 737-2695 [voice], (541) 737-3099 [fax]. E-mail: (first author).;Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331.;Department of Geosciences, Oregon State University, Corvallis, OR 97331;Chevron Research and Technology Co., 100 Chevron Way, Richmond, CA 94802. |