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H1：height difference between the surface of back filled soil inside the base and the ground, H1 > 0 mm.
H2: height difference between the surface of back filled soil outside the base and the ground, 50 mm < H2 < 100 mm.
H3: height difference between the bottom of the pit and the ground, 670 mm < H3 < 730 mm.
Use a spirit level to check the levelness of surfaces X and Y.
Tramp down the back filled soil. After the backfilling, ensure that the soil surface does not sink when a person of 80 kg
stands on it.
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