Layer | Operation | Usual materials |
Smoothing | Smoothing of waste contour in order to construct the final capping-provisional capping. | Soil materials of average permeability |
Low permeability | Interruption of surface water ingress into wastes. | Geosynthetic Clay Liner (GCL). |
Drainage | Controlled run-off of rainwater outside the final contour. Reduction of hydraulic elevation above the low permeability layer. Connected to respective works for arranging rainwater. | Draining material (gravel) |
Protection | The barrier between the capping layers and the overlaying new uses (vegetation, etc). Protection of underlying from the root system of plants and from exposure. | Clean soil materials. |