LANDFILL CAPS
Just as federal and state regulations detail every aspect of landfill location, construction and operation, they now detail every aspect of its closure design. A typical MSW landfill cap, from the bottom up, consists of a gas-venting layer, a low-permeability barrier layer (soil, a geosynthetic clay liner and/or a geomembrane), a barrier protection layer and a vegetable soil layer.
Closure requirements are critical for the post closure life cycle of a landfill as many landfills do not have synthetic membrane linings to prevent the filtration of leachate into the groundwater. Consequently the formation of leachate within a landfill cell must be prevented at all costs.
GeoCHEM's containment linings fulfill this need. PVC is the primary material of choice for the following reasons:
Provided in large factory fabricated panels to reduce field seaming requirements and installation costs.
Easy seamability-simple field tools required.
Reliable, durable, fully homogenous factory and field seams.
Excellent puncture and impact resistance to resist mechanical damage during installation and earth covering operations.
"Lay flat" contact subgrade (to promote a complete and rapid diversion of surface rainwater) as opposed to "buckling" effect caused in other geomembranes by their thermal contraction/expansion characteristics.
Excellent soil friction efficiency.
Non yield elongation characteristics-PVC will not "yield" or weaken until it reaches its breaking strength which occurs at 300-450% ultimate elongation; some geomembrane materials will yield under continued stress after an elongation of only 10-12% is achieved.
PVC is the most flexible of lining materials due to its amorphous molecular structure.
A specifying engineer or project owner can be assured of the long-term serviceability of PVC in this application as the product has been in use for over thirty years as a containment membrane in various types of lagoons, holding ponds, and landfills themselves.
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