Current through Register Vol. 48, No. 38, September 20, 2024
a) During
construction and installation, liners (except in the case of existing portions
of surface impoundments exempt from Section
724.321(a)
) and cover systems (e.g., membranes, sheets, or coatings) must be inspected
for uniformity, damage and imperfections (e.g., holes, cracks, thin spots, or
foreign materials). Immediately after construction or installation:
1) Synthetic liners and covers must be
inspected to ensure tight seams and joints and the absence of tears, punctures,
and blisters; and
2) Soil-based and
admixed liners and covers must be inspected for imperfections including lenses,
cracks, channels, root holes, or other structural non-uniformities that may
cause an increase in the permeability of that liner or cover.
b) While a surface impoundment is
in operation, it must be inspected weekly and after storms to detect evidence
of any of the following:
1) Deterioration,
malfunctions, or improper operation of overtopping control systems;
2) Sudden drops in the level of the
impoundment's contents; and
3)
Severe erosion or other signs of deterioration in dikes or other containment
devices.
c) Prior to the
issuance of a permit, and after any extended period of time (more than six
months) during which the impoundment was not in service, the owner or operator
must obtain a certification from a qualified engineer that the impoundment's
dike, including that portion of any dike that provides freeboard, has
structural integrity. The certification must establish, in particular, that the
following are true of the dike:
1) It will
withstand the stress of the pressure exerted by the types and amounts of wastes
to be placed in the impoundment; and
2) It will not fail due to scouring or
piping, without dependence on any liner system included in the surface
impoundment construction.
d) Monitoring of LDS.
1) An owner or operator required to have a
LDS under Section
724.321(c) or
(d) must record the amount of liquids removed
from each LDS sump at least once each week during the active life and closure
period.
2) After the final cover is
installed, the amount of liquids removed from each LDS sump must be recorded at
least monthly. If the liquid level in the sump stays below the pump operating
level for two consecutive months, the amount of liquids in the sumps must be
recorded at least quarterly. If the liquid level in the sump stays below the
pump operating level for two consecutive quarters, the amount of liquids in the
sumps must be recorded at least semi-annually. If at any time during the
post-closure care period the pump operating level is exceeded at units on
quarterly or semi-annual recording schedules, the owner or operator must return
to monthly recording of amounts of liquids removed from each sump until the
liquid level again stays below the pump operating level for two consecutive
months.
3) "Pump operating level"
is a liquid level proposed by the owner or operator pursuant to 35 Ill. Adm.
Code
703.203(b)(5)
and approved by the Agency based on pump
activation level, sump dimensions, and level that avoids backup into the
drainage layer and minimizes head in the sump.
