25 Pa. Code § 289.242 - Cover
(a) The operator
shall place final cover within 1 year after closure. The Department may require
placement and revegetation of an intermediate cover that meets the requirements
of §
288.233 (relating to intermediate
cover and slopes), during the period between closure and construction of the
final cover system.
(b) Except as
provided in subsection (c), the operator shall provide final cover in the
following manner:
(1) A cap shall be placed
and graded over the entire surface of each final lift. The cap may be no more
permeable than 1.0 x 10-7 cm/sec. The following
performance standards for the cap shall be met:
(i) The cap shall minimize the migration of
precipitation into the landfill.
(ii) The cap shall be resistant to physical
and chemical failure.
(iii) The cap
shall cover all areas where waste is disposed.
(2) A drainage layer capable of transmitting
flow and preventing erosion of the soil layer shall be placed over the
cap.
(3) A uniform layer of
material shall be placed over the drainage layer. The layer of material shall
support vegetation and protect the cap.
(c) The Department may waive the cap and
drainage layer requirements of subsection (b)(1) and (2) based on a
demonstration that it is not necessary to limit infiltration into the
waste.
(d) Unless alternative
design requirements to meet the performance standards in subsection (b)(1) are
approved as part of the permit under §
287.231 (relating to equivalency
review procedure), the cap shall meet the design requirements for caps in
Appendix A, Table II (relating to minimum liner design standards).
(e) The layer of material described in
subsection (b)(3) and intermediate cover, if required, shall meet the following
performance standards. Cover material shall:
(1) Prevent vectors, odors and other
nuisances.
(2) Cover residual waste
after it is placed without change in its properties and without regard to
weather.
(3) Be capable of
controlling fires.
(4) Be capable
of supporting the germination and propagation of vegetative cover as required
by §§
289.244 and
289.245 (relating to revegetation;
and standards for successful revegetation).
(5) Not crack excessively when dry.
(6) Be capable of preventing frost damage to
the cap.
(7) For intermediate
cover, compact well.
(8) Be
consistent with the waste acceptance plan.
(f) Unless alternative design requirements to
meet the performance standards in subsection (e) are approved as part of the
permit under §
287.231, the layer of material
described in subsection (b)(3) shall meet the following design requirements:
(1) The cover soil shall fall within the
United States Department of Agriculture textural classes of sandy loam, loam,
sandy clay loam, silty clay loam, loamy sand and silt loam.
(2) At least 40% by weight of the cover soil
shall be capable of passing through a 2 millimeter, No. 10 mesh
sieve.
(3) The cover may not
include rocks that are greater than 6 inches in diameter.
(4) The layer of cover soil shall be at least
2 feet thick.
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