12:00 PM - 12:15 PM
*Osamu Kazaoka1, Masaaki Uzawa2, Tomoyo Hiyama2, Itaru Ogitsu1, Hisashi Yabusaki1, Atsushi Kagawa1, Takeshi Yoshida1, Akiko Kato1, Takayuki Ogura1 (1.Research Institute of Environmental Geology, Chiba, 2.Kanto Construction Co. Ltd.)