Green areas are situated in areas, which until they are handed over, can be used in various ways. Only in a few cases do these areas have natural, undamaged and unpolluted soil, what characterizes the areas of agricultural or horticultural crops. Most often, however, the way they are used until they are put into construction leads to contamination or damage to the soil. Often, landfills are designated for green areas, warehouses, and even landfills. The preparation of such sites for earthworks depends on this, whether excavations or embankments will be carried out in a given place. For example, it is not allowed to make embankments in the places of the designed foundation of buildings or elements of garden architecture, if there are thick layers of soil, loose or slightly cohesive materials, e.g.. peat bogs or landfills. In these places, the settlement of the embankment could be quite large, long-lasting and could damage the structure. The preparation of such areas for earthworks depends on the planned development, usually, however, such materials must be removed.
In places intended for plant cultivation, there should be no materials under the layer of covered earth, which would hinder normal plant growth. For example, leaving the old impermeable pavement in place at a shallow depth, where a lawn is to be established, it always has a negative impact on its appearance.