Current through Register Vol. 48, No. 38, September 20, 2024
a) All units
shall be equipped with a leachate drainage and collection system and a
compacted earth liner designed as an integrated system in compliance with the
requirements of this Section and of Sections
817.407
and
817.408
b) The liner and leachate
collection system shall be stable during all phases of construction and
operation. The side slopes shall achieve a minimum static safety factor of 1.3
and a minimum seismic safety factor of 1.0 at all times.
c) The liner shall be designed to function
for the entire design period.
d)
Compacted earth liner standards:
1) The
minimum allowable thickness shall be 0.91 meters (3.0 feet).
2) The liner shall be compacted to achieve a
maximum hydraulic conductivity of 1x10-7 centimeters
per second.
3) The construction and
compaction of the liner shall be carried out in accordance with the
construction quality assurance procedures of 35 Ill. Adm. Code 811.Subpart E so
as to reduce void spaces and allow the liner to support the loadings imposed by
the waste disposal operation without settling that causes or contributes to the
failure of the leachate collection system.
4) The liner shall be constructed from
materials whose properties are not affected by contact with the constituents of
the leachate expected to be produced.
e) Slurry trenches and cutoff walls used to
prevent migration of leachate:
1) Slurry
trenches and cutoff walls built to contain leachate migration shall be used
only in conjunction with a compacted earth liner meeting the requirements of
subsection (d) above or as part of a remedial action required by 35 Ill. Adm.
Code
811.319.
2) Slurry trenches and cutoff walls shall
extend into the bottom confining layer to a depth that will establish and
maintain a continuous hydraulic connection and prevent seepage.
3) Exploration borings shall be drilled along
the route of the slurry trench or cutoff wall to confirm the depth to the
confining layer. In situ tests shall be conducted to determine the hydraulic
conductivity of the confining layer.
4) Slurry trenches and cutoff walls shall be
stable under all conditions during the design period of the facility. They
shall not be susceptible to displacement or erosion under stress or hydraulic
gradient.
5) Slurry trenches and
cutoff walls shall be constructed in conformance to a construction quality
assurance plan, pursuant to 35 Ill. Adm. Code 811.Subpart E, that insures that
all material and construction methods meet design specifications.
f) The owner or operator may
utilize liner configurations other than those specified in this Section,
special construction techniques, and admixtures, provided that:
1) The alternative technology or material
provides equivalent, or superior, performance to the requirements of this
Section;
2) The technology or
material has been successfully utilized in at least one application or pilot
facility similar to the proposed application;
3) Methods for manufacturing quality control
and construction quality assurance can be implemented; and
4) The owner or operator has received written
approval from the Agency prior to the start of construction.
