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When laying water pipelines, excavated soil is generally disposed and replaced with commercially available sandy material. Reuse of the excavated soil yields reduction of both the environmental loads and the construction costs. Although "The guideline for use of excavated soil" by Ministry of Land, Infrastructure and Transport, specifies reusable soil types, it is not common practice to use the excavated soil for the laying of water pipeline because the specification requires complicateddoi:10.3208/jgs.15.257 fatcat:kzdpvzz5zbbdbigpiiiwfdidwq