Current through Register Vol. 54, No. 44, November 2, 2024
(a) The leachate collection system within the
protective cover shall meet the following performance standards. The leachate
collection system shall:
(1) Ensure that free
flowing liquids and leachate will drain continuously from the protective cover
to the leachate treatment system without ponding or accumulating on the
liner.
(2) Ensure that the depth of
leachate on or above the primary liner does not exceed 1 foot.
(3) Withstand chemical attack from
leachate.
(4) Withstand anticipated
loads, stresses and disturbances from overlying waste, waste cover materials
and equipment operation.
(5)
Function without clogging.
(6)
Cover the bottom and sidewalls of the facility.
(b) Unless alternative design requirements to
the performance standards in subsection (a) are approved as part of the permit
under §
271.231 (relating to equivalency
review procedure), the leachate collection system within the protective cover
shall comply with the following design requirements:
(1) The leachate collection system shall
include a perforated piping system which is capable of intercepting free
flowing liquids and leachate within the protective cover and conveying them to
a collection sump for storage, processing or disposal. The collection sump
shall be of sufficient size to transmit leachate that is generated and shall be
capable of automatic and continuous functioning.
(2) The perforated piping system shall be
sloped, sized and spaced to assure that free flowing liquids and leachate will
drain continuously from the protective cover to the collection sump or
point.
(3) The minimum diameter of
the perforated pipes shall be 6 inches with a wall thickness of Schedule 80 or
greater as specified by ASTM, or equivalent.
(4) The leachate collection system shall
contain stones or aggregates.
(5)
The pipes shall be installed primarily perpendicular to the flow and shall have
a postsettlement grade of at least 2%.
(6) The leachate collection system shall be
cleaned and maintained as necessary.
(7) The leachate collection system shall have
a minimum bottom slope of 2%.
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); and 25 Pa. Code §
273.282 (relating to number,
location and depth of monitoring
points).
