Abstract
Recently, the volume of soil surplus has become larger and larger with increase of construction works such as subway construction and road one in urban area, and the disposal of soil surplus becomes a big social problem to be solved. So after this, effective use of soil surplus must be examined because some of them can be recycle as refill material after any chemical treatment. This paper proposes a comprehensive recycle planning of soil surplus considering a time lag of supply and demand and disposal of soil surplus, and makes it clear that an optimal planning to minimize total work load can be obtained by Transportation Problem.