05-22-2024, 10:03 PM
(05-22-2024, 09:38 PM)nms Wrote: What's the point of removing all the top soil?
Topsoil isn't adequate to use as a structural fill material due to the organic nature of it. As the organic matter decomposes it results in settlement, when a foundation is built on topsoil or any inadequate fill for that matter the structure will sink. Hence topsoil is removed so grading activities can occur on the native soil, if there is not enough native soil to properly grade the site, like this site, clean fill is brought in which is the native soil from another location which still has the desired properties. Once the structures are complete the topsoil is then brought back onto the site.