Current through Bulletin 2024-06, March 15, 2024
(a) Secondary containment systems shall be:
(1) 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) Capable of
detecting and collecting releases and accumulated liquids until the collected
material is removed.
Note to Subsection R315-261-193(a): If the collected material
is a hazardous waste under Rule R315-261, it is subject to management as a
hazardous waste in accordance with all applicable requirements of Rules
R315-262 through 265, 266, and 268. If the collected material is discharged
through a point source to waters of the United States, it is subject to the
requirements of sections 301, 304, and 402 of the Clean Water Act, as amended.
If discharged to a Publicly Owned Treatment Works (POTW), it is subject to the
requirements of section 307 of the Clean Water Act, as amended. If the
collected material is released to the environment, it may be subject to the
reporting requirements of 40 CFR part 302.
(b) To meet the requirements of Subsection
R315-261-193(a), secondary containment systems shall be at a minimum:
(1) Constructed of or lined with materials
that are compatible with the materials(s) to be placed in the tank system and
shall 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) 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) Provided with a leak-detection system
that is designed and operated so that it 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) Sloped or otherwise designed or operated
to drain and remove liquids resulting from leaks, spills, or precipitation.
Spilled or leaked material and accumulated precipitation shall be removed from
the secondary containment system within 24 hours, or in as timely a manner as
is possible to prevent harm to human health and the environment.
(c) Secondary containment for
tanks shall 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 R315-261-193(a), (b), and (c), secondary
containment systems shall satisfy the following requirements:
(1) External liner systems shall be:
(i) Designed or operated to contain 100
percent of the capacity of the largest tank within its boundary;
(ii) 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. Such additional capacity shall be sufficient to contain
precipitation from a 25-year, 24-hour rainfall event.
(iii) Free of cracks or gaps; and
(iv) 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 tank(s), i.e., capable
of preventing lateral as well as vertical migration of the material.
(2) Vault systems shall be:
(i) Designed or operated to contain 100
percent of the capacity of the largest tank within its boundary;
(ii) 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. Such additional capacity shall be sufficient to contain
precipitation from a 25-year, 24-hour rainfall event;
(iii) Constructed with chemical-resistant
water stops in place at all joints, if any;
(iv) 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;
(v) 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
(vi) 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) Double-walled tanks shall be:
(i) 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;
(ii) Protected, if constructed of metal, from
both corrosion of the primary tank interior and of the external surface of the
outer shell; and
(iii) Provided
with a built-in continuous leak detection system capable of detecting a release
within 24 hours, or at the earliest practicable time.
Note to Subsection R315-261-193(d)(3): The provisions
outlined in the Steel Tank Institute's (STI) "Standard for Dual Wall
Underground Steel Storage Tanks" may be used as guidelines for aspects of the
design of underground steel double-walled tanks.
(f) Ancillary equipment shall be provided
with secondary containment, e.g., trench, jacketing, double-walled piping, that
meets the requirements of Subsections R315-261-193(a) and (b) except for:
(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) Sealless or
magnetic coupling pumps and sealless 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, that are visually inspected for leaks on a daily
basis.