"Impermeable" means not permitting passage through a substance which, when used in the solid waste rules to describe any soil or geosynthetic component of a landfill liner or cap, means the component has a saturated hydraulic conductivity of 1 x 10 -7 cm/sec or less.
N.H. Admin. Code § Env-Sw 103.24
(See Revision Note at chapter heading for Env-Sw 100) #8460-B, eff 10-28-05