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.
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.
Impervious Material for purposes of this permit means a material that does not allow water to pass through it.
More Definitions of Impervious Material
Impervious Material means any material which prevents the passage of dampness;
Impervious Material means material—
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.)
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;
Impervious Material. – means a material with a percolation rate of slower than sixty
Impervious Material. - means material with a percolation rate of slower than sixty (60) minutes per inch.
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 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