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What is a landfill cap?

Landfill capping is a containment technology that forms a barrier between the contaminated media and the surface, thereby shielding humans and the environment from the harmful effects of its contents and perhaps limiting the migration of the contents. A cap must restrict surface water infiltration into the contaminated subsurface to reduce the potential for contaminants to leach from the site.

Landfills have been the most common form of waste disposal, and old landfills are present or in close proximity to most communities in the United States. Prior to environmental laws that regulated waste disposal, landfills were no more than holes in the ground filled with waste and covered with dirt. Many of the old landfills that are problems today were constructed in this fashion.

Source Landfill Caps and Enhancements

The landfill next to the Roblar Road quarry site has no cap.