1. Assoc. Prof., Civ. Engrg., North Carolina State Univ., Raleigh, NC 27695-7908.
2. Asst. Res. Prof., Civ. Engrg., North Carolina State Univ., Raleigh, NC 27695-7908.
3. Proj. Mgr., Williams Environmental Services, Inc., formerly GRA, Civ. Engrg., North Carolina State Univ., Raleigh, NC 27695-7908.