1. Iowa State Univ., 2901 South Loop Dr., Suite 3100, Ames, IA 50010; formerly, Wiss, Janney, Elstner Assoc., Inc., NDE Validation Center, 6300 Georgetown Pike, McLean, VA 22101.
2. Federal Highway Administration, NDE Validation Center, 6300 Georgetown Pike, McLean, VA 22101.
3. Wiss, Janney, Elstner Assoc., Inc., 2721 Prosperity Ave., Suite 300, Fairfax, VA 22031; formerly, Wiss, Janney, Elstner Assoc., Inc., NDE Validation Center, 6300 Georgetown Pike, McLean, VA 22101.
4. Professional Service Industries, Inc., Turner Fairbank Highway Research Center, 6300 Georgetown Pike, McLean, VA 22101; formerly, Wiss, Janney, Elstner Assoc., Inc., NDE Validation Center, 6300 Georgetown Pike, McLean, VA 22101.
5. Wiss, Janney, Elstner Assoc., Inc., 4165 Shackleford Rd., Suite 100, Norcross, GA 30093.