How to construct a 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). A flexible geomembrane liner is placed resting on the barrier layer. Geomembranes are habitually supplied in sizeable rolls and are available in quite a few thickness (20 to 140 mil), widths (15 to 100 ft), and lengths (180 to 840 ft). The candidate list of polymers regularly used is drawn out, which includes polyvinyl chloride (PVC), polyethylenes of various densities, reinforced chlorosulfonated polyethylene (CSPE-R), polypropylene, ethylene interpolymer alloy (EIA), and several newcomers. Soils used as barrier materials in the main are clays that are flattened to a hydraulic conductivity no greater than 1 x 10-6 cm/sec. Compacted soil barriers are usually installed in 6-inch smallest possible lifts to accomplish a thickness of 2 feet or more. A composite barrier uses both soil and a geomembrane, taking advantage of the properties of each. The geomembrane is in effect impermeable, but, if it develops a leak, the soil component prevents noteworthy leakage into the underlying litter.

For facilities lying on putreDCIble wastes, the collection and manage of methane and carbon dioxide, potent greenhouse gases, must be part of facility design and operation.

Concrete Cap/Asphaltic (Note Terra Seal Xtream (TSX)
can be used in place of clay with better results at lower prices)


The most successful single-layer caps are composed of concrete or bituminous asphalt. It is used to form a surface barrier sandwiched between landfill and the environment. An asphalt concrete cap would lessen leaching through the landfill into an adjacent aquifer.

Subtitle C Capping (Note Terra Seal Xtream (TSX)
can be used in place of clay with better results at lower prices)


The RCRA C multilayered landfill cap is a baseline design that is not compulsory for use in RCRA hazardous waste applications. These caps normally consist of an upper vegetative (topsoil) layer, a drainage layer, and a low permeability layer which consists of a artificial lining greater than 2 feet of compacted clay. The compacted clay liners are effective if they maintain a certain moisture content but are prone to cracking if the clay matter is dried out. Thus substitute cap designs are by and large considered meant for arid environments.

RCRA Subtitle D Cap

RCRA Subtitle D requirements are for non-hazardous trash landfills. The design of a landfill cover for a RCRA Subtitle D facility is in the main a function of the foundation liner scheme or natural subsoils there. The cover must meet the following specifications:

* the material should exhibit a permeability no greater than 1 x 10-5 cm/s, or equal permeability of any foundation liner or natural subsoils present, whichever is less. This is where Terra Seal Xtream (TSX)
; shines, It will make un-usable soils, Usable.

* The layer to keep the waste dry must contain at least 45 cm of subsoil material type.
* The erosion prevention layer has to be not less than 150 mm of subsoil material able to sustain indigenous flora development.

Different design can be considered, but must be remain of corresponding performance as the specifications outlined above. Altogether, covers should be designed to avoid the bathtub effect. The bathtub effect occurs when a more permeable cover is positioned above a less permeable bottom liner or natural subsoil. The landfill then fills up approximating a tub.


Landfill Cap

DCI can increase the effectiveness of any landfill cap system. regardless of its final intention, DCI will lower the permeability to keep water out and gas in. On your next Landfill Cap Specify DCI


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