7.2.1. Ground layers
thick layer at least 50cm land will be built on the area closure. Background layer is compressed to reach the appropriate thickness for all the construction on soil with low permeability and, if necessary, can do on a support when any equipment or temporary system set up.
Class garbage the car will eventually be compacted to the maximum density possible until uncompressed anymore. Land will be compressed at least 90% density according Proctor Test Methods Regulation Change (ASTM 1557). The thickness of the substrate layer will be added if the field test shows that this is not enough to support the requirements above soil compaction with low permeability.
7.2.2. Soils with low permeability
layer of waterproofing A minimum thickness of 30 cm for water permeable layer is coated on the substrate. This low permeability layer is made of soil or similar materials with hydraulic conductivity of 1 x 10-6 cm smaller / sec or equivalent, the water permeability is lower than the standard current regulations.
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