1. Postdoctoral Res. Engr., Dept. of Civ. and Envir. Engrg., Univ. of California, Davis, Davis, CA 95616. E-mail: mwjenkins@ucdavis.edu
2. Prof., Dept. of Civ. and Envir. Engrg., Univ. of California, Davis, Davis, CA 95616. E-mail: jrlund@ucdavis.edu