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Impervious Liner [1]

A flexible, liquid-proof, plastic or synthetic material used to line the walls and bottom of an underground storage tank [2] excavation or the diked [3] area of an aboveground storage tank installation, to provide a means of secondary containment [4] in event of a release or spill.

Because water and other liquids cannot move through the material, it is referred to as impervious.

Source URL (modified on 10/07/2014): https://testing.pei.org/wiki/impervious-liner

Links
[1] https://testing.pei.org/wiki/impervious-liner
[2] https://testing.pei.org/node/300
[3] https://testing.pei.org/node/273
[4] https://testing.pei.org/node/533