Current through Register Vol. 48, No. 38, September 20, 2024
a) The following must be true of a secondary
containment system:
1) The system is
designed, installed, and operated to prevent any migration of materials or
accumulated liquid out of the system to the soil, ground water, or surface
water at any time during the use of the tank system; and
2) The system is capable of detecting and
collecting releases and accumulated liquids until the collected material is
removed.
BOARD NOTE: If the collected material is a hazardous waste
under this Part, the material is subject to management as a hazardous waste in
accordance with all applicable requirements of 35 Ill. Adm. Code 722 through
728. If the collected material is discharged through a point source to waters
of the United States, it is subject to the NPDES permit requirement of Section
12(f) of the Environmental Protection Act and 35 Ill. Adm. Code 309. If
discharged to a Publicly Owned Treatment Works (POTW), it is subject to the
requirements of 35 Ill. Adm. Code 307 and 310. If the collected material is
released to the environment, it may be subject to the reporting requirements of
35 Ill. Adm. Code
750.410
and federal
40 CFR
302.6.
b) To meet the requirements of subsection
(a), a secondary containment system must fulfill the following requirements:
1) The secondary containment system must be
constructed of or lined with materials that are compatible with the materials
to be placed in the tank system and must have sufficient strength and thickness
to prevent failure owing to pressure gradients (including static head and
external hydrological forces), physical contact with the material to which it
is exposed, climatic conditions, and the stress of daily operation (including
stresses from nearby vehicular traffic);
2) The secondary containment system must be
placed on a foundation or base capable of providing support to the secondary
containment system, resistance to pressure gradients above and below the
system, and capable of preventing failure due to settlement, compression, or
uplift;
3) The secondary
containment system must be provided with a leak-detection system that is
designed and operated so that the system will detect the failure of either the
primary or secondary containment structure or the presence of any release of
hazardous secondary material or accumulated liquid in the secondary containment
system at the earliest practicable time; and
4) The secondary containment system must be
sloped or otherwise designed or operated to drain and remove liquids resulting
from leaks, spills, or precipitation. Spilled or leaked material and
accumulated precipitation must be removed from the secondary containment system
in as timely a manner as is possible, but in no case later than 24 hours after
the leak, spill, or accumulation of precipitation occurs, to prevent harm to
human health and the environment.
c) Secondary containment for tanks must
include one or more of the following devices:
1) A liner (external to the tank);
2) A vault; or
3) A double-walled tank.
d) In addition to the requirements of
subsections (a), (b), and (c), secondary containment systems must satisfy the
following requirements:
1) An external liner
system must fulfill the following requirements:
A) The secondary containment system must be
designed or operated to contain 100 percent of the capacity of the largest tank
within its boundary;
B) The
secondary containment system must be designed or operated to prevent run-on or
infiltration of precipitation into the secondary containment system unless the
collection system has sufficient excess capacity to contain run-on or
infiltration. The additional capacity must be sufficient to contain
precipitation from a 25-year, 24-hour rainfall event;
C) The secondary containment system must be
free of cracks or gaps; and
D) The
secondary containment system must be designed and installed to surround the
tank completely and to cover all surrounding earth likely to come into contact
with the material if the material is released from the tanks (i.e., capable of
preventing lateral as well as vertical migration of the material).
2) A vault system must fulfill the
following requirements:
A) The vault system
must be designed or operated to contain 100 percent of the capacity of the
largest tank within its boundary;
B) The vault system must be designed or
operated to prevent run-on or infiltration of precipitation into the secondary
containment system unless the collection system has sufficient excess capacity
to contain run-on or infiltration. The additional capacity must be sufficient
to contain precipitation from a 25-year, 24-hour rainfall event;
C) The vault system must be constructed with
chemical-resistant water stops in place at all joints (if any);
D) The vault system must be provided with an
impermeable interior coating or lining that is compatible with the stored
material and that will prevent migration of material into the
concrete;
E) The vault system must
be provided with a means to protect against the formation of and ignition of
vapors within the vault, if the material being stored or treated is ignitable
or reactive; and
F) The vault
system must be provided with an exterior moisture barrier or be otherwise
designed or operated to prevent migration of moisture into the vault if the
vault is subject to hydraulic pressure.
3) A double-walled tank must fulfill the
following requirements:
A) The double-walled
tank must be designed as an integral structure (i.e., an inner tank completely
enveloped within an outer shell) so that any release from the inner tank is
contained by the outer shell;
B)
The double-walled tank must be protected, if constructed of metal, from both
corrosion of the primary tank interior and of the external surface of the outer
shell; and
C) The double-walled
tank must be provided with a built-in continuous leak detection system capable
of detecting a release at the earliest practicable time, but in no case later
than 24 hours after the release occurs.
BOARD NOTE: The provisions outlined in the Steel Tank
Institute's (STI) "Standard for Dual Wall Underground Steel Storage Tanks",
incorporated by reference in 35 Ill. Adm. Code
720.111, may be used
as guidelines for aspects of the design of underground steel double-walled
tanks.
e) This subsection (e) corresponds with
40 CFR
261.194(e), which USEPA has
marked "reserved". This statement maintains structural consistency with the
corresponding federal regulations.
f) Ancillary equipment must be provided with
secondary containment (e.g., trench, jacketing, double-walled piping, etc.)
that meets the requirements of subsections (a) and (b), except for the
following equipment:
1) Aboveground piping
(exclusive of flanges, joints, valves, and other connections) that are visually
inspected for leaks on a daily basis;
2) Welded flanges, welded joints, and welded
connections that are visually inspected for leaks on a daily basis;
3) Seal-less or magnetic coupling pumps and
seal-less valves that are visually inspected for leaks on a daily basis;
and
4) Pressurized aboveground
piping systems with automatic shut-off devices (e.g., excess flow check valves,
flow metering shutdown devices, loss of pressure actuated shut-off devices,
etc.) that are visually inspected for leaks on a daily basis.
