(a) The disposal units must be designed to resist inadvertent intrusion. Through a combination of design and a commitment to institutional control, waste disposal units intended to contain only Class A wastes must resist inadvertent intrusion for a period of 100 years. Disposal units intend to contain Class B wastes (alone or with Class A wastes) must be designed to resist inadvertent intrusion for a period of 300 years. Disposal units intended to contain any Class C waste must be designed to resist inadvertent intrusion for a period of 500 years.

(b) The disposal units must maintain their structural stability and containment of the waste under normal environmental conditions, such as exposure to solar radiation, wind, precipitation (rain, hail, snow and ice), humidity, temperature variations, freezethaw cycles, and the chemical constituents in precipitation (e.g., acid rain).

(c) The disposal units must facilitate any necessary remedial action during the institutional control period. This provision must not adversely affect the ability of the land disposal facility to meet the performance objectives of sections 382.10-382.15 of this Part.