Current through Register Vol. 48, No. 38, September 20, 2024
a) The unit
must be covered by a final cover consisting of a low permeability layer
overlain by a final protective layer constructed in accordance with the
requirements of this Section, unless the Agency has issued an RD&D permit
that allows the use of an innovative final cover technology pursuant to an
adjusted standard issued under 35 Ill. Adm. Code
813.112(b),
and that permit is in effect.
b)
Standards for the Low Permeability Layer
1)
Not later than 60 days after placement of the final lift of solid waste, a low
permeability layer must be constructed.
2) The low permeability layer must cover the
entire unit and connect with the liner system.
3) The low permeability layer must consist of
any one of the following:
A) A compacted
earth layer constructed in accordance with the following standards:
i) The minimum allowable thickness must be
0.91 meter (3 feet); and
ii) The
layer must be compacted to achieve a permeability of
1x10-7 centimeters per second and minimize void
spaces.
iii) Alternative
specifications may be utilized provided that the performance of the low
permeability layer is equal to or superior to the performance of a layer
meeting the requirements of subsections (b)(3)(A)(i) and
(b)(3)(A)(ii).
B) A
geomembrane constructed in accordance with the following standards:
i) The geomembrane must provide performance
equal or superior to the compacted earth layer described in subsection
(b)(3)(A).
ii) The geomembrane must
have strength to withstand the normal stresses imposed by the waste
stabilization process.
iii) The
geomembrane must be placed over a prepared base free from sharp objects and
other materials that may cause damage.
C) Any other low permeability layer
construction techniques or materials, provided that they provide equivalent or
superior performance to the requirements of this subsection (b).
4) For an MSWLF unit, subsection
(b)(3) notwithstanding, if the bottom liner system permeability is lower than 1
x 10-7 cm/sec, the permeability of the low
permeability layer of the final cover system must be less than or equal to the
permeability of the bottom liner system.
c) Standards for the Final Protective Layer
1) The final protective layer must cover the
entire low permeability layer.
2)
The thickness of the final protective layer must be sufficient to protect the
low permeability layer from freezing and minimize root penetration of the low
permeability layer, but must not be less than 0.91 meter (3 feet).
3) The final protective layer must consist of
soil material capable of supporting vegetation.
4) The final protective layer must be placed
as soon as possible after placement of the low permeability layer to prevent
desiccation, cracking, freezing, or other damage to the low permeability
layer.
d) Any
alternative requirements for the infiltration barrier in subsection (b) for any
owner or operator of an MSWLF that disposes of 20 tons (18 megagrams) of
municipal solid waste per day or less, based on an annual average, must be
established by an adjusted standard pursuant to Section 28.1 of the Act and
Subpart D of 35 Ill. Adm. Code 104. Any alternative requirements established
under this subsection must fulfill the following requirements:
1) They must consider the unique
characteristics of small communities;
2) They must take into account climatic and
hydrogeologic conditions; and
3)
They must be protective of human health and the environment.
BOARD NOTE: Subsection (b)(4) is derived from
40 CFR
258.60(a) (2017). Subsection
(d) is derived from
40 CFR
258.60(b)(3) (2017). Those
segments of subsection (a) that relate to RD&D permits are derived from
40 CFR
258.4(b) (2017).
