Current through Register Vol. 54, No. 44, November 2, 2024
(a)
Performance standards. The secondary liner shall meet the
following requirements:
(1) It shall prevent
the migration of leachate through the liner to the greatest degree that is
technologically possible.
(2) The
effectiveness of it in preventing the migration of leachate may not be
adversely affected by the physical or chemical characteristics of solid waste,
solid waste constituents or leachate from the facility.
(3) It shall be resistant to physical
failure, chemical failure and other failure from the sources identified under
§
273.161(d)
(relating to liner system and leachate control plan).
(b)
Alternative design
requirements. 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 secondary liner shall meet, at a minimum, the
requirements of the table in §
273.256(e)
(relating to primary liner).
(c)
Requirements. A secondary liner shall:
(1) Be no more permeable than 1 x
10-7 cm./sec. based on laboratory and field
testing.
(2) Be installed according
to manufacturer's specifications under the supervision of an authorized
representative of the manufacturer if the liner is synthetic. An approved
quality assurance and quality control plan shall be implemented in the field
during the installation of the liner.
(3) Be designed, installed and maintained
according to a quality assurance and quality control plan approved by the
Department if the liner is remolded clay.
(4) Be inspected for uniformity, damage and
imperfections during construction and installation.
(d)
Compacted lifts.
Secondary liners made of clay, bentonite and bentonite-like materials shall be
constructed in compacted lifts not exceeding 6 inches in depth unless the
operator submits data from a field demonstration validating the suitability of
compacted lifts greater than 6 inches. A lift shall be scarified before
placement of the next lift.
(e)
Composite secondary liner.
(1) If the operator does not design,
construct, operate and maintain a composite primary liner, the operator shall
design, construct, operate and maintain a composite secondary liner which has
the following components:
(i) An upper
component made of a manufactured geosynthetic liner that meets the requirements
of this section independently of the composite component.
(ii) A composite component made of earthen
material that meets the requirements of this section independently of the upper
component, except that the composite component may be no more permeable than
1.0 x 10-7 cm/sec. based on laboratory and field
testing and, at a minimum, meets the requirements of the table in §
273.256(e).
(2) The two
components of the composite liner shall be designed, constructed and maintained
to provide a compression connection, or direct, continuous, and uniform
contact, between them.
(3) The use
of a composite secondary liner does not relieve the operator of responsibility
for a separate primary liner under § 273.256.
(f)
Natural attenuation of leachate
prohibited. A facility or a component thereof that is subject to this
chapter may not have a secondary liner based upon natural attenuation of
leachate.
This section cited in 25 Pa. Code §
273.161 (relating to liner system
and leachate control plan); 25 Pa. Code §
273.251 (relating to scope and
requirements); 25 Pa. Code §
273.256 (relating to primary
liner); and 25 Pa. Code §
285.123 (relating to
impoundments-general).
