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*Kunio Furuno
former Research Institute of Environmental Geology, Chiba (RIEGC)
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Atsushi Kagawa
Research Institute of Environmental Geology, Chiba (RIEGC)
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Takashi Kusuda
former Research Institute of Environmental Geology, Chiba (RIEGC)
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Hisashi Nirei
(NPO)The Society of Geo-pollution Control, Japan