Soil
Wood chips
Wood chips are the small pieces of stump and root that a grinder leaves behind in and around the hole after a stump is ground.
After grinding, a pile of wood chips fills the hole and spills around it. The chips are a mix of stump wood and some soil. Iowa State Extension says most arborists will not remove this material unless it is requested, and that the hole is only filled if requested.
Crews can haul the chips away, or leave them. Some owners reuse clean chips as mulch in a bed, away from the new grass. Left in the hole, chips can hurt a lawn. Illinois Extension notes that wood mixed in the soil can tie up nitrogen, which makes grass hard to grow.
Cincinnati Stump Grinding says on Angi that its machine will reduce a stump to wood chips, and that it can haul the chips away and replace them with fresh topsoil. See what to do with stump grindings.