1. Member, ASCE
2. PhD Candidate, Dept. of Civ. and Envir. Engrg., Univ. of Illinois at Urbana, Champaign, Urbana, IL 61801-2352.
3. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Illinois at Urbana, Champaign, Urbana, IL (corresponding author).
4. Chemical Engr., U.S. Army Constr. Engrg. Res. Lab., Champaign, IL 61826.
5. Envir. Engr., Dept. of Civ. and Envir. Engrg., Univ. of Illinois at Urbana, Champaign, Urbana, IL.