1. Washington State Department of Transportation, Olympia, Washington, 98504-7365, USA, Telephone: 1/360-709-5450, Telefax: 1/360-709-5585,
2. GeoEngineering Centre at Queen’s-RMC, Civil Engineering Department, Royal Military College of Canada, Kingston, Ontario, K7K 7B4, Canada, Telephone: 1/613-541-6000 Ext. 6479; Telefax: 1/613-541-6218;
3. Ryan Engineering and Design, Inc., 2190 Leyland Alcove, Woodbury, Minnesota 55125, USA, Telephone: 1/651-735-7622; Telefax: 1/651-735-7629;