(a) For construction/demolition waste landfills in surface mined areas in which the disposal area abuts a highwall, the operator shall design, construct and maintain a barrier between the highwall and the disposal area that meets the following performance standards:
- (1) The barrier shall prevent the lateral migration of leachate from the disposal area.
- (2) The effectiveness of the barrier in preventing the lateral migration of leachate may not be adversely affected by solid waste, solid waste constituents or leachate from the facility.
- (3) The barrier shall meet the requirements of § 277.291(a) (relating to mineral resources).
(b) Unless alternative design requirements to meet the performance standards in subsection (a) are approved as part of the permit under § 271.231 (relating to equivalency review procedure), the barrier shall meet the following design requirements. The barrier shall be:
- (1) Twelve horizontal feet in thickness.
- (2) No more permeable than 1x10-7 cm./sec. based on laboratory and field testing.
- (3) Made of clay as specified in Table I to § 277.255 (relating to liner).
- (c) The barrier shall be designed, installed and maintained according to a quality assurance and quality control plan approved by the Department.
- (d) The barrier shall be inspected for uniformity, damage and imperfections during construction and installation.
Cross References
This section cited in 25 Pa. Code § 277.161 (relating to liner system and leachate control plan); 25 Pa. Code § 277.164 (relating to application requirements for noncoal mine disposal); and 25 Pa. Code § 277.251 (relating to scope and requirements).