Affiliation: | aCentre de Géologie de l'Ingénieur,École Nationale des Ponts et Chaussées, 60 Boulevard Saint-Michel, 75272 Paris cedex, France bDepartment of Waste Management Engineering, The Institute of Public Health, 6-1 Shirokanedai 4 chome, Minato-ku, Tokyo 108, Japan cEnvironmental Geology Department, Geological Survey of Japan, Higashi 1-1-3, Tsukuba, Ibaraki 305, Japan |