| 摘要 |
An earth pit is prepared for the storage of waste materials by lining the bottom of the pit with a layer of finely-ground loose material followed by a synthetic plastic sheet resistant to humus, roots and tearing followed by a second layer of finely-ground loose material. The layers of loose material equal the pressure on the opposite sides of the synthetic plastic sheet. A number of sheets may be solution-welded together for a large pit.
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