The most common term is *excess soil*. This can apply to soil that is reused on the same site, or hauled off. *Surplus soil* is also a common term, but is more strongly associated with soil that is sold off and hauled away. In construction, *surplus* tends to indicate something has a resale value.

> Cut-Fill/Borrow/Excess/Dirt Balance: refers to how many cubic yards of dirt will be excavated, moved, placed and compacted on a job site. After the excavation (Cuts) are completed, the site may have too much dirt (Excess) or not enough (Borrow). Ideally, an owner wants to have a Balanced site to avoid the costs of hauling Excess off-site or buying Borrow material. 
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> https://graynson.com/glossary-sitework-common-terms/