Impervious barrier definition

Impervious barrier means a barrier of sufficient thickness, density, and composition that is impenetrable to the regulated substance, has a permeability of at least 1 X 10-6 cm/sec., and will prevent the discharge to the environment of any regulated substance for a period of at least as long as the maximum anticipated time during which the regulated substance will be in contact with the impervious material.
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Impervious barrier means any material or structure on, above, or below the ground that does not allow precipitation or surface water to penetrate directly into the underlying surface.
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Related to Impervious barrier

  • Impervious surface means a surface that has been covered with a layer of material so that it is highly resistant to infiltration by water.

  • Impervious area means any surface that does not allow stormwater to infiltrate into the ground.

  • Pervious surface means an area that releases as runoff a small portion of the precipitation that falls on it. Lawns, gardens, parks, forests or other similar vegetated areas are examples of surfaces that typically are pervious.

  • Regulated impervious surface means any of the following, alone or in combination:

  • Barrier means Barrier Level x R (initial).