Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 724 - STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES
Subpart K - SURFACE IMPOUNDMENTS
Section 724.328 - Closure and Post-Closure Care
Universal Citation: 35 IL Admin Code ยง 724.328
Current through Register Vol. 48, No. 38, September 20, 2024
a) At closure, the owner or operator must do the following:
1) Remove or decontaminate all waste
residues, contaminated containment system components (liners, etc.),
contaminated subsoils and structures, and equipment contaminated with waste and
leachate, and manage them as hazardous waste, unless 35 Ill. Adm. Code
721.103(d)
applies; or
2) Closure in Place
A) Eliminate free liquids by removing liquid
wastes or solidifying the remaining wastes and waste residues;
B) Stabilize remaining wastes to a bearing
capacity sufficient to support final cover; and
C) Cover the surface impoundment with a final
cover designed and constructed to do the following:
i) Provide long-term minimization of the
migration of liquids through the closed impoundment;
ii) Function with minimum
maintenance;
iii) Promote drainage
and minimize erosion or abrasion of the final cover;
iv) Accommodate settling and subsidence so
that the cover's integrity is maintained; and
v) Have a permeability less than or equal to
the permeability of any bottom liner system or natural subsoils
present.
b) If some waste residues or contaminated materials are left in place at final closure, the owner or operator must comply with all post-closure requirements contained in Sections 724.217 through 724.220, including maintenance and monitoring throughout the post-closure care period (specified in the permit under Section 724.217). The owner or operator must do the following:
1) Maintain the integrity and
effectiveness of the final cover, including making repairs to the cap, as
necessary to correct the effects of settling, subsidence, erosion, or other
events;
2) Maintain and monitor the
LDS in accordance with Sections
724.321(c)(2)(D)
and (c)(3) and
724.326(d),
and comply with all other applicable LDS requirements of this Part;
3) Maintain and monitor the groundwater
monitoring system and comply with all other applicable requirements of Subpart
F; and
4) Prevent run-on and
run-off from eroding or otherwise damaging the final cover.
c) Contingent Plans
1) If an owner or operator plans to close a
surface impoundment in accordance with subsection (a)(1), and the impoundment
does not comply with the liner requirements of Section
724.321(a)
and is not exempt from them in accordance with Section
724.321(b),
then the following apply:
A) The closure plan
for the impoundment under Section
724.212
must include both a plan for complying with subsection (a)(1) and a contingent
plan for complying with subsection (a)(2) in case not all contaminated subsoils
can be practicably removed at closure; and
B) The owner or operator must prepare a
contingent post-closure plan under Section
724.218
for complying with subsection (b) in case not all contaminated subsoils can be
practicably removed at closure.
2) The cost estimates calculated under
Sections
724.242
and
724.244
for closure and post-closure care of an impoundment subject to this subsection
(c) must include the cost of complying with the contingent closure plan and the
contingent post-closure plan, but are not required to include the cost of
expected closure under subsection (a)(1).
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