Jeffrey A. Adams ENGEO Inc., San Ramon, California (CHAP. 14)

Ertugrul Alp Alp & Associates Incorporated, Richmond Hill, Ontario, Canada (CHAP. 10)

Margaret-Ann Armour Department of Chemistry, University of Alberta, Edmonton (CHAP. 29)

J. Arnaldos Centre d'Estudis del Risc Tecnol gic ( CERTEC) , Universitat Polit cnica de Catalunya Institut d'Estudis Catalans, Barcelona, Catalonia, Spain (CHAPS. 22, 31, 41)

Andreas F. Bienz Bienz, Kummer & Partner Ltd, Consulting Engineers Safety Planning, Risk Management, Zollikerberg, Switzerland (CHAP. 12)

E. Buglova Research and Clinical Institute of Radiation Medicine and Endocrinology, Ministry of Health, Minsk, Belarus (CHAP. 9)

Bertrand Carissimo Electricit de France, Chatou, France (CHAP. 19)

J. Casal Centre d'Estudis del Risc Tecnol gic ( CERTEC) , Universitat Polit cnica de Catalunya Institut d'Estudis Catalans, Barcelona, Catalonia, Spain (CHAPS. 22, 31, 41)

Philip Chatwin Department of Applied Mathematics, University of Sheffield, Sheffield, U.K. (CHAP. 25)

Nijs Jan Duijm Ris ? National Laboratory, Roskilde, Denmark (CHAP. 19)

C. A. Leif Ericson CHEMTREC, Arlington, VA (CHAP. 5)

Merv Fingas Emergencies Science Division, Environment Canada, Environmental Technology Centre, River Road, Ottawa, Ontario (CHAPS. 16, 30, 32 36, 38, 39, 44)

Ernst Goldschmitt United Nations Environment Program, Paris (CHAP. 2)

R. F. Griffiths Environmental Technology Centre, Department of Chemical Engineering, UMIST, Manchester, United Kingdom (CHAP. 37)

John S. Gulliver Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota (CHAP. 20)

A. J. (Tony) Haggerty Hazardous Substance Advisor, Auckland Region, New Zealand Fire Service