1. Staff Engr., Black & Veatech, 545 N. Pleasantburg Dr., Ste. 101, Greenville, SC 29607; formerly, Grad. Res. Asst., Via Dept. of Civ. and Envir. Engrg., Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061.
2. W. Curtis English Prof. and Head, Via Dept. of Civ. and Envir. Engrg., Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061.