Impervious Material definition

Impervious Material means a material of sufficient thickness, density and composition that is impenetrable to the Regulated Substance, has a permeability of less than 1 X 10 7 cm/sec., and that will prevent the discharge to the lands, ground waters, or surface waters of the State 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 material.
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Impervious Material means a material through which fluid does not readily pass because of low porosity, very small individual pores, or pores that are disconnected.
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Impervious Material for purposes of this permit means a material that does not allow water to pass through it.
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Examples of Impervious Material in a sentence

  • Impervious Material: Clayey soil or other similar material which will prevent percolation into the drainage zone behind the wall.

  • Hardpan, Clay, Impervious Material - Impervious hardpan or clay, or shale, if present, shall be at least 4 feet below the bottom of the trench or bed.

  • Impervious Material: Used to provide a relatively impermeable barrier to reduce seepage.

  • Figure 3.5 is an example of a perimeter gas collection trench.EM 1110-1-401630 May 2008 Gas Collection Rock40 -60 mil Geomembrane with Protective GeotextileWasteLandfill Cover Undisturbed Impervious Material or Water Table Figure 3.5. Perimeter Collection Trench.

  • Hardpan Clay, Impervious Material - Impervious hardpan clay, stone or shale, if present, shall be at least four feet below the bottom of the soil absorption system, and shall also be at least four feet below the parent ground surface.


More Definitions of Impervious Material

Impervious Material means material—
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Impervious Material means a cover material that restricts the passage of water and/or air into the sub-surface area of an on-site sewage system (OSS) (e.g., Blacktop paving, plastics or soils with heavy clay content).
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Impervious Material means a 750 mm layer of clay with a hydraulic conductivity less than 1 x 1o-6 cm/sec or any other material with an equi- valent hydraulic conductivity;
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Impervious Material means any material which prevents the passage of dampness;
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Impervious Material means material that allows a relatively low rate of water movement through its cross section.
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Impervious Material means any material through which water cannot penetrate. Such material includes, but is not limited to, principal or accessory structures, porches and decks, either covered or of tongue and groove construction, concrete, asphalt, or similar substances, but excludes gravel, shell or crushed stone.
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Impervious Material. – means a material with a percolation rate of slower than sixty
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