Landfill Cap

The landfill Cap which is the Seal ing layer over a landfill is usually done to:

* Reduce exposure on the surface of the waste facility.
* Inhibit vertical infiltration of water into wastes that would create contaminated leachate.
* Manage gas emissions from underlying garbage.
* Produce a ground surface so as to maintain foliage and/or exist for additional purposes.

The plan of landfill cap depends on the environment and the objectives of the landfill cap. A landfill Cap can range from a one-layer system of vegetated soil to a multifaceted multi-layer technique of soils and geosynthetics. In general, less involved systems are necessary in arid climates and more complex systems are required in wet weather climates. The material used in the building of a landfill cap includes low-permeability and high-permeability soils and geosynthetics. The low-permeability materials redirect water and preclude its path into the trash. The high permeability materials move water away that percolates into the landfill cap.

The most crucial components of a landfill cap are the barrier layer and the drainage layer. The barrier layer can be low-permeability soil (clay) and/or geosynthetic clay liners (GCLs) or stabilized local soils. Often times the local soil is disregarded as usable simply due to the fact that it will not meet the permeability requirements. DCI is able to take the "un-suitable" soils and modify them to exceed the requirements for a landfill cap. DCI has been enhancing soils to meet permeability requirements for years. A typical soil can be enhanced to exceed the 1 x 10-6 cm/sec requirements of the average landfill cap.
Simply by using a material that would normally be regarded as �un-suitable�, and enhancing it with Terra Seal Xtream (TSX)
, we are able to enhance the soil permeability coefficient beyond the requirements set by the EPA and the landfill cap guidelines . Note the smaller the column in the graph, the less water will be allowed to penetrate the soil and further less water will penetrate the landfill cap. .

For more information on our programs please download the following document regarding our landfill products and refer also to our section on permeability reduction.

Articles of interest

How to construct a Landfill Cap

Videos about Landfills and the landfill cap

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