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What is a landfill liner and what's it for?

A landfill liner, or composite landfill liner, is intended to be a low permeable barrier, which is laid down under engineered landfill sites. Until it deteriorates, the liner retards migration of leachate, and its toxic constituents, into underlying aquifers or nearby rivers, causing spoiliation of the local water.

Modern landfills generally require a layer of compacted clay with a minimum required thickness and a maximum allowable hydraulic conductivity, overlaid by a high-density polyethylene geomembrane.

The United States Environmental Protection Agency‎‎ has stated that the barriers "will ultimately fail" while the site remains a threat for "thousands of years",  suggesting that modern landfill designs delay but do not prevent ground and surface water pollution.

Source: Wikipedia

The landfill next to the Roblar Rock quarry site is not lined.