1. Member, ASCE
2. Envir. Process Engr., Lawrence Livermore Nat. Lab., 7000 East Ave., L-623 Livermore, CA 94550. E-mail: gatesdd@LLNL.gov.
3. Assoc. Prof., Envir. Sci. and Engrg. Div., Colorado School of Mines, 112 Coolbaugh Hall, Golden, CO 80401-1887.
4. Fac. Mgr., Oak Ridge Nat. Lab., P.O. 2008 MS-6036, Oak Ridge, TN 37831-6036.