(a) Commencing July 1, 1984, no person shall cause, threaten or allow the disposal in any landfill of any liquid hazardous waste unless specific authorization is obtained from the Agency by the generator and the landfill owner and operator for the land disposal of that specific waste stream.(b) The Board shall have the authority to adopt regulations which prohibit or set limitations on the type, amount and form of liquid hazardous wastes that may be disposed of in landfills based on the availability of technically feasible and economically reasonable alternatives to land disposal.(c) The Agency may grant specific authorization for the land disposal of liquid hazardous wastes only after the generator has reasonably demonstrated that, considering current technological feasibility and economic reasonableness, the hazardous waste cannot be reasonably solidified, stabilized, or recycled for reuse, nor incinerated or chemically, physically or biologically treated so as to neutralize the hazardous waste and render it nonhazardous, and that land disposal is not prohibited or limited by Board regulations. In granting authorization under this Section, the Agency may impose such conditions as may be necessary to accomplish the purposes of this Act and which are consistent with Board regulations. If the Agency refuses to grant authorization under this Section, the applicant may appeal as if the Agency refused to grant a permit pursuant to the provisions of subsection (a) of Section 40 of this Act.(d) For purposes of this Section, the term "landfill" means a disposal facility or part of a facility where hazardous waste is placed in or on land and which is not a land treatment facility, a surface impoundment or an underground injection well.