35 Ill. Adm. Code 724.984
Standards: Tanks
Section 724
Section 724.984 Standards:
Tanks
a) The provisions of this Section apply to the control of air
pollutant emissions from tanks for which Section 724.982(b) references the use
of this Section for such air emission control.
b) The owner or operator must control air pollutant emissions
from each tank subject to this Section in accordance with the following
requirements, as applicable:
1) For a tank that manages hazardous waste that meets all of the
conditions specified in subsections (b)(1)(A) through (b)(1)(C), the owner or
operator must control air pollutant emissions from the tank in accordance with
the Tank Level 1 controls specified in subsection (c) or the Tank Level 2
controls specified in subsection (d).
A) The hazardous waste in the tank has a maximum organic vapor
pressure that is less than the maximum organic vapor pressure limit for the
tank's design capacity category, as follows:
i) For a tank design capacity equal to or greater than 151 m
3
(39,900 gal), the maximum organic vapor pressure limit for the tank is 5.2 kPa
(0.75 psig).
ii) For a tank design capacity equal to or greater than 75 m
3
(19,800 gal) but less than 151 m
3
(39,900 gal), the maximum organic
vapor pressure limit for the tank is 27.6 kPa (4.00 psig).
iii) For a tank design capacity less than 75 m
3
(19,800
gal), the maximum organic vapor pressure limit for the tank is 76.6 kPa (11.1
psig).
B) The hazardous waste in the tank is not heated by the owner or
operator to a temperature that is greater than the temperature at which the
maximum organic vapor pressure of the hazardous waste is determined for the
purpose of complying with subsection (b)(1)(A).
C) The owner or operator does not treat the hazardous waste in the
tank using a waste stabilization process, as defined in 35 Ill. Adm. Code
725.981.
2) For a tank that manages hazardous waste that does not meet all
of the conditions specified in subsections (b)(1)(A) through (b)(1)(C) , the
owner or operator must control air pollutant emissions from the tank by using
Tank Level 2 controls in accordance with the requirements of subsection (d).
Examples of tanks required to use Tank Level 2 controls include a tank used for
a waste stabilization process and a tank for which the hazardous waste in the
tank has a maximum organic vapor pressure that is equal to or greater than the
maximum organic vapor pressure limit for the tank's design capacity category,
as specified in subsection (b)(1)(A).
c) Owners and operators controlling air pollutant emissions from
a tank using Tank Level 1 controls must meet the requirements specified in
subsections (c)(1) through (c)(4):
1) The owner or operator must determine the maximum organic vapor
pressure for a hazardous waste to be managed in the tank using Tank Level 1
controls before the first time the hazardous waste is placed in the tank. The
maximum organic vapor pressure must be determined using the procedures specified
in Section 724.983(c). Thereafter, the owner or operator must perform a new
determination whenever changes to the hazardous waste managed in the tank could
potentially cause the maximum organic vapor pressure to increase to a level
that is equal to or greater than the maximum organic vapor pressure limit for
the tank design capacity category specified in subsection (b)(1)(A), as
applicable to the tank.
2) The tank must be equipped with a fixed roof designed to meet
the following specifications:
A) The fixed roof and its closure devices must be designed to form
a continuous barrier over the entire surface area of the hazardous waste in the
tank. The fixed roof may be a separate cover installed on the tank (e.g., a
removable cover mounted on an open-top tank) or may be an integral part of the
tank structural design (e.g., a horizontal cylindrical tank equipped with a
hatch).
B) The fixed roof must be installed in such a manner that there
are no visible cracks, holes, gaps, or other open spaces between roof section
joints or between the interface of the roof edge and the tank wall.
C) Either of the following must be true of each opening in the
fixed roof and of any manifold system associated with the fixed roof:
i) The opening or manifold system is equipped with a closure
device designed to operate so that when the closure device is secured in the
closed position there are no visible cracks, holes, gaps, or other open spaces
in the closure device or between the perimeter of the opening and the closure
device; or
ii) The opening or manifold system is connected by a closed-vent
system that is vented to a control device. The control device must remove or
destroy organics in the vent stream, and it must be operating whenever
hazardous waste is managed in the tank, except as provided for in subsection
(c)(2)(E).
D) The fixed roof and its closure devices must be made of suitable
materials that will minimize exposure of the hazardous waste to the atmosphere,
to the extent practical, and will maintain the integrity of the fixed roof and
closure devices throughout their intended service life. Factors to be
considered when selecting the materials for and designing the fixed roof and
closure devices must include the following: the organic vapor permeability;
the effects of any contact with the hazardous waste or its vapors managed in
the tank; the effects of outdoor exposure to wind, moisture, and sunlight; and
the operating practices used for the tank on which the fixed roof is installed.
E) The control device operated pursuant to subsection (c)(2)(C)
needs not remove or destroy organics in the vent stream under the following
conditions:
i) During periods when it is necessary to provide access to the
tank for performing the activities of subsection (c)(2)(E)(ii), venting of the
vapor headspace underneath the fixed roof to the control device is not
required, opening of closure devices is allowed, and removal of the fixed roof
is allowed. Following completion of the activity, the owner or operator must
promptly secure the closure device in the closed position or reinstall the
cover, as applicable, and resume operation of the control device; and
ii) During periods of routine inspection, maintenance, or other
activities needed for normal operations, and for removal of accumulated sludge
or other residues from the bottom of the tank.
BOARD NOTE:
Subsections (c)(2)(E)(i) and (c)(2)(E)(ii) are derived from 40 CFR
264.1084(c)(2)(iii)(B)(
1
) and (c)(2)(iii)(B)(
2
), which the Board
has codified here to comport with Illinois Administrative Code format
requirements.
3) Whenever a hazardous waste is in the tank, the fixed roof must
be installed with each closure device secured in the closed position, except as
follows:
A) Opening of closure devices or removal of the fixed roof is
allowed at the following times:
i) To provide access to the tank for performing routine
inspection, maintenance, or other activities needed for normal operations.
Examples of such activities include those times when a worker needs to open a
port to sample the liquid in the tank, or when a worker needs to open a hatch
to maintain or repair equipment. Following completion of the activity, the
owner or operator must promptly secure the closure device in the closed
position or reinstall the cover, as applicable, to the tank.
ii) To remove accumulated sludge or other residues from the
bottom of the tank.
B) Opening of a spring-loaded pressure-vacuum relief valve,
conservation vent, or similar type of pressure relief device that vents to the
atmosphere is allowed during normal operations for the purpose of maintaining
the tank internal pressure in accordance with the tank design specifications.
The device must be designed to operate with no detectable organic emissions
when the device is secured in the closed position. The settings at which the
device opens must be established so that the device remains in the closed
position whenever the tank internal pressure is within the internal pressure
operating range determined by the owner or operator based on the tank
manufacturer recommendations, applicable regulations, fire protection and
prevention codes, standard engineering codes and practices, or other
requirements for the safe handling of flammable, ignitable, explosive,
reactive, or hazardous materials. Examples of normal operating conditions that
may require these devices to open are during those times when the tank internal
pressure exceeds the internal pressure operating range for the tank as a result
of loading operations or diurnal ambient temperature fluctuations.
C) Opening of a safety device, as defined in 35 Ill. Adm. Code
725.981, is allowed at any time conditions require doing so to avoid an unsafe
condition.
4) The owner or operator must inspect the air emission control
equipment in accordance with the following requirements.
A) The fixed roof and its closure devices must be visually
inspected by the owner or operator to check for defects that could result in
air pollutant emissions. Defects include, but are not limited to, visible
cracks, holes, or gaps in the roof sections or between the roof and the tank
wall; broken, cracked, or otherwise damaged seals or gaskets on closure
devices; and broken or missing hatches, access covers, caps, or other closure
devices.
B) The owner or operator must perform an initial inspection of the
fixed roof and its closure devices on or before the date that the tank becomes
subject to this Section. Thereafter, the owner or operator must perform the
inspections at least once every year except under the special conditions
provided for in subsection (l).
C) In the event that a defect is detected, the owner or operator must
repair the defect in accordance with the requirements of subsection (k).
D) The owner or operator must maintain a record of the inspection
in accordance with the requirements specified in Section 724.989(b).
d) Owners and operators controlling air pollutant emissions from
a tank using Tank Level 2 controls must use one of the following tanks:
1) A fixed-roof tank equipped with an internal floating roof in
accordance with the requirements specified in subsection (e);
2) A tank equipped with an external floating roof in accordance
with the requirements specified in subsection (f);
3) A tank vented through a closed-vent system to a control device
in accordance with the requirements specified in subsection (g);
4) A pressure tank designed and operated in accordance with the
requirements specified in subsection (h); or
5) A tank located inside an enclosure that is vented through a
closed-vent system to an enclosed combustion control device in accordance with
the requirements specified in subsection (i).
e) The owner or operator that controls air pollutant emissions
from a tank using a fixed roof with an internal floating roof must meet the
requirements specified in subsections (e)(1) through (e)(3).
1) The tank must be equipped with a fixed roof and an internal
floating roof in accordance with the following requirements:
A) The internal floating roof must be designed to float on the
liquid surface except when the floating roof must be supported by the leg supports.
B) The internal floating roof must be equipped with a continuous
seal between the wall of the tank and the floating roof edge that meets either
of the following requirements:
i) A single continuous seal that is either a liquid-mounted seal
or a metallic shoe seal, as defined in 35 Ill. Adm. Code 725.981; or
ii) Two continuous seals mounted one above the other. The lower
seal may be a vapor-mounted seal.
C) The internal floating roof must meet the following
specifications:
i) Each opening in a noncontact internal floating roof except
for automatic bleeder vents (vacuum breaker vents) and the rim space vents is
to provide a projection below the liquid surface.
ii) Each opening in the internal floating roof must be equipped
with a gasketed cover or a gasketed lid except for leg sleeves, automatic
bleeder vents, rim space vents, column wells, ladder wells, sample wells, and
stub drains.
iii) Each penetration of the internal floating roof for the
purpose of sampling must have a slit fabric cover that covers at least 90
percent of the opening.
iv) Each automatic bleeder vent and rim space vent must be
gasketed.
v) Each penetration of the internal floating roof that allows for
passage of a ladder must have a gasketed sliding cover.
vi) Each penetration of the internal floating roof that allows for
passage of a column supporting the fixed roof must have a flexible fabric
sleeve seal or a gasketed sliding cover.
2) The owner or operator must operate the tank in accordance with
the following requirements:
A) When the floating roof is resting on the leg supports, the
process of filling, emptying, or refilling must be continuous and must be
completed as soon as practical.
B) Automatic bleeder vents are to be set closed at all times when
the roof is floating, except when the roof is being floated off or is being
landed on the leg supports.
C) Prior to filling the tank, each cover, access hatch, gauge
float well or lid on any opening in the internal floating roof must be bolted
or fastened closed (i.e., no visible gaps). Rim space vents must be set to
open only when the internal floating roof is not floating or when the pressure
beneath the rim exceeds the manufacturer's recommended setting.
3) The owner or operator must inspect the internal floating roof
in accordance with the procedures specified as follows:
A) The floating roof and its closure devices must be visually
inspected by the owner or operator to check for defects that could result in
air pollutant emissions. Defects include, but are not limited to, any of the
following: when the internal floating roof is not floating on the surface of
the liquid inside the tank; when liquid has accumulated on top of the internal
floating roof; when any portion of the roof seals have detached from the roof
rim; when holes, tears, or other openings are visible in the seal fabric; when
the gaskets no longer close off the hazardous waste surface from the
atmosphere; or when the slotted membrane has more than 10 percent open area.
B) The owner or operator must inspect the internal floating roof
components as follows, except as provided in subsection (e)(3)(C):
i) Visually inspect the internal floating roof components
through openings on the fixed-roof (e.g., manholes and roof hatches) at least
once every 12 months after initial fill, and
ii) Visually inspect the internal floating roof, primary seal,
secondary seal (if one is in service), gaskets, slotted membranes, and sleeve
seals (if any) each time the tank is emptied and degassed and at least once
every 10 years.
C) As an alternative to performing the inspections specified in
subsection (e)(3)(B) for an internal floating roof equipped with two continuous
seals mounted one above the other, the owner or operator may visually inspect
the internal floating roof, primary and secondary seals, gaskets, slotted
membranes, and sleeve seals (if any) each time the tank is emptied and degassed
and at least every five years.
D) Prior to each inspection required by subsection (e)(3)(B) or
(e)(3)(C), the owner or operator must notify the Agency in advance of each
inspection to provide the Agency with the opportunity to have an observer
present during the inspection. The owner or operator must notify the Agency of
the date and location of the inspection, as follows:
i) Prior to each visual inspection of an internal floating roof
in a tank that has been emptied and degassed, written notification must be
prepared and sent by the owner or operator so that it is received by the Agency
at least 30 calendar days before refilling the tank, except when an inspection
is not planned, as provided for in subsection (e)(3)(D)(ii).
ii) When a visual inspection is not planned and the owner or
operator could not have known about the inspection 30 calendar days before
refilling the tank, the owner or operator must notify the Agency as soon as
possible, but no later than seven calendar days before refilling of the tank.
This notification may be made by telephone and immediately followed by a
written explanation for why the inspection is unplanned. Alternatively,
written notification, including the explanation for the unplanned inspection,
may be sent so that it is received by the Agency at least seven calendar days
before refilling the tank.
E) In the event that a defect is detected, the owner or operator must
repair the defect in accordance with the requirements of subsection (k).
F) The owner or operator must maintain a record of the inspection
in accordance with the requirements specified in Section 724.989(b).
4) Safety devices, as defined in 35 Ill. Adm. Code 725.981, may
be installed and operated as necessary on any tank complying with the
requirements of this subsection (e).
f) The owner or operator that controls air pollutant emissions
from a tank using an external floating roof must meet the requirements
specified in subsections (f)(1) through (f)(3).
1) The owner or operator must design the external floating roof
in accordance with the following requirements:
A) The external floating roof must be designed to float on the
liquid surface except when the floating roof must be supported by the leg
supports.
B) The floating roof must be equipped with two continuous seals,
one above the other, between the wall of the tank and the roof edge. The lower
seal is referred to as the primary seal, and the upper seal is referred to as
the secondary seal.
i) The primary seal must be a liquid-mounted seal or a metallic
shoe seal, as defined in 35 Ill. Adm. Code 725.981. The total area of the gaps
between the tank wall and the primary seal must not exceed 212 square
centimeters (cm
2
) per meter (10.0 square inches (in
2
) per
foot) of tank diameter, and the width of any portion of these gaps must not
exceed 3.8 centimeters (cm) (1.5 in). If a metallic shoe seal is used for the
primary seal, the metallic shoe seal must be designed so that one end extends
into the liquid in the tank and the other end extends a vertical distance of at
least 61 cm (24 in) above the liquid surface.
ii) The secondary seal must be mounted above the primary seal and
cover the annular space between the floating roof and the wall of the tank. The
total area of the gaps between the tank wall and the secondary seal must not
exceed 21.2 cm
2
per meter (1.00 in
2
per foot) of tank
diameter, and the width of any portion of these gaps must not exceed 1.3 cm
(0.51 in).
C) The external floating roof must meet the following
specifications:
i) Except for automatic bleeder vents (vacuum breaker vents) and
rim space vents, each opening in a noncontact external floating roof must
provide a projection below the liquid surface.
ii) Except for automatic bleeder vents, rim space vents, roof
drains, and leg sleeves, each opening in the roof must be equipped with a
gasketed cover, seal, or lid.
iii) Each access hatch and each gauge float well must be equipped
with a cover designed to be bolted or fastened when the cover is secured in the
closed position.
iv) Each automatic bleeder vent and each rim space vent must be
equipped with a gasket.
v) Each roof drain that empties into the liquid managed in the
tank must be equipped with a slotted membrane fabric cover that covers at least
90 percent of the area of the opening.
vi) Each unslotted and slotted guide pole well must be equipped
with a gasketed sliding cover or a flexible fabric sleeve seal.
vii) Each unslotted guide pole must be equipped with a gasketed cap
on the end of the pole.
viii) Each slotted guide pole must be equipped with a gasketed float
or other device that closes off the liquid surface from the atmosphere.
ix) Each gauge hatch and each sample well must be equipped with a
gasketed cover.
2) The owner or operator must operate the tank in accordance with
the following requirements:
A) When the floating roof is resting on the leg supports, the
process of filling, emptying, or refilling must be continuous and must be
completed as soon as practical.
B) Except for automatic bleeder vents, rim space vents, roof
drains, and leg sleeves, each opening in the roof must be secured and
maintained in a closed position at all times except when the closure device
must be open for access.
C) Covers on each access hatch and each gauge float well must be
bolted or fastened when secured in the closed position.
D) Automatic bleeder vents must be set closed at all times when
the roof is floating, except when the roof is being floated off or is being
landed on the leg supports.
E) Rim space vents must be set to open only at those times that
the roof is being floated off the roof leg supports or when the pressure
beneath the rim seal exceeds the manufacturer's recommended setting.
F) The cap on the end of each unslotted guide pole must be
secured in the closed position at all times except when measuring the level or
collecting samples of the liquid in the tank.
G) The cover on each gauge hatch or sample well must be secured in
the closed position at all times except when the hatch or well must be opened
for access.
H) Both the primary seal and the secondary seal must completely
cover the annular space between the external floating roof and the wall of the
tank in a continuous fashion except during inspections.
3) The owner or operator must inspect the external floating roof
in accordance with the procedures specified as follows:
A) The owner or operator must measure the external floating roof
seal gaps in accordance with the following requirements:
i) The owner or operator must perform measurements of gaps
between the tank wall and the primary seal within 60 calendar days after
initial operation of the tank following installation of the floating roof and,
thereafter, at least once every five years.
ii) The owner or operator must perform measurements of gaps
between the tank wall and the secondary seal within 60 calendar days after
initial operation of the tank following installation of the floating roof and,
thereafter, at least once every year.
iii) If a tank ceases to hold hazardous waste for a period of one
year or more, subsequent introduction of hazardous waste into the tank must be
considered an initial operation for the purposes of subsections (f)(3)(A)(i)
and (f)(3)(A)(ii).
iv) The owner or operator must determine the total surface area of
gaps in the primary seal and in the secondary seal individually using the
procedure of subsection (f)(3)(D).
v) In the event that the seal gap measurements do not conform to
the specifications in subsection (f)(1)(B), the owner or operator must repair
the defect in accordance with the requirements of subsection (k).
vi) The owner or operator must maintain a record of the inspection
in accordance with the requirements specified in Section 724.989(b).
B) The owner or operator must visually inspect the external
floating roof in accordance with the following requirements:
i) The floating roof and its closure devices must be visually
inspected by the owner or operator to check for defects that could result in
air pollutant emissions. Defects include, but are not limited to, any of the
following conditions: holes, tears, or other openings in the rim seal or seal
fabric of the floating roof; a rim seal detached from the floating roof; all or
a portion of the floating roof deck being submerged below the surface of the
liquid in the tank; broken, cracked, or otherwise damaged seals or gaskets on
closure devices; and broken or missing hatches, access covers, caps, or other
closure devices.
ii) The owner or operator must perform an initial inspection of
the external floating roof and its closure devices on or before the date that
the tank becomes subject to this Section. Thereafter, the owner or operator must
perform the inspections at least once every year except for the special
conditions provided for in subsection (l).
iii) In the event that a defect is detected, the owner or operator
must repair the defect in accordance with the requirements of subsection (k).
iv) The owner or operator must maintain a record of the inspection
in accordance with the requirements specified in Section 724.989(b).
C) Prior to each inspection required by subsection (f)(3)(A) or
(f)(3)(B), the owner or operator must notify the Agency in advance of each
inspection to provide the Agency with the opportunity to have an observer
present during the inspection. The owner or operator must notify the Agency of
the date and location of the inspection, as follows:
i) Prior to each inspection to measure external floating roof
seal gaps as required under subsection (f)(3)(A), written notification must be
prepared and sent by the owner or operator so that it is received by the Agency
at least 30 calendar days before the date the measurements are scheduled to be
performed.
ii) Prior to each visual inspection of an external floating roof
in a tank that has been emptied and degassed, written notification must be
prepared and sent by the owner or operator so that it is received by the Agency
at least 30 calendar days before refilling the tank, except when an inspection
is not planned as provided for in subsection (f)(3)(C)(iii).
iii) When a visual inspection is not planned and the owner or
operator could not have known about the inspection 30 calendar days before
refilling the tank, the owner or operator must notify the Agency as soon as
possible, but no later than seven calendar days before refilling of the tank.
This notification may be made by telephone and immediately followed by a
written explanation for why the inspection is unplanned. Alternatively, written
notification, including the explanation for the unplanned inspection, may be
sent so that it is received by the Agency at least seven calendar days before
refilling the tank.
D) Procedure for determining the total surface area of gaps in the
primary seal and the secondary seal:
i) The seal gap measurements must be performed at one or more
floating roof levels when the roof is floating off the roof supports.
ii) Seal gaps, if any, must be measured around the entire
perimeter of the floating roof in each place where a 0.32 cm (0.125 in)
diameter uniform probe passes freely (without forcing or binding against the
seal) between the seal and the wall of the tank and measure the circumferential
distance of each such location.
iii) For a seal gap measured under subsection (f)(3), the gap
surface area must be determined by using probes of various widths to measure
accurately the actual distance from the tank wall to the seal and multiplying
each such width by its respective circumferential distance.
iv) The total gap area must be calculated by adding the gap
surface areas determined for each identified gap location for the primary seal
and the secondary seal individually, and then dividing the sum for each seal
type by the nominal diameter of the tank. These total gap areas for the
primary seal and secondary seal are then compared to the respective standards
for the seal type, as specified in subsection (f)(1)(B).
BOARD NOTE:
Subsections (f)(3)(D)(i) through (f)(3)(D)(iv) are derived from 40 CFR 264.1084(f)(3)(i)(D)(
1
)
through (f)(3)(i)(D)(
4
), which the Board has codified here to comport
with Illinois Administrative Code format requirements.
4) Safety devices, as defined in 35 Ill. Adm. Code 725.981, may
be installed and operated as necessary on any tank complying with the
requirements of subsection (f).
g) The owner or operator that controls air pollutant emissions
from a tank by venting the tank to a control device must meet the requirements
specified in subsections (g)(1) through (g)(3).
1) The tank must be covered by a fixed roof and vented directly
through a closed-vent system to a control device in accordance with the
following requirements:
A) The fixed roof and its closure devices must be designed to form
a continuous barrier over the entire surface area of the liquid in the tank.
B) Each opening in the fixed roof not vented to the control device
must be equipped with a closure device. If the pressure in the vapor headspace
underneath the fixed roof is less than atmospheric pressure when the control
device is operating, the closure device must be designed to operate so that
when the closure device is secured in the closed position there are no visible
cracks, holes, gaps, or other open spaces in the closure device or between the
perimeter of the cover opening and the closure device. If the pressure in the
vapor headspace underneath the fixed roof is equal to or greater than
atmospheric pressure when the control device is operating, the closure device
must be designed to operate with no detectable organic emissions.
C) The fixed roof and its closure devices must be made of suitable
materials that will minimize exposure of the hazardous waste to the atmosphere,
to the extent practical, and will maintain the integrity of the fixed roof and
closure devices throughout their intended service life. Factors to be
considered when selecting the materials for and designing the fixed roof and
closure devices must include the following: organic vapor permeability; the
effects of any contact with the liquid and its vapor managed in the tank; the
effects of outdoor exposure to wind, moisture, and sunlight; and the operating
practices used for the tank on which the fixed roof is installed.
D) The closed-vent system and control device must be designed and
operated in accordance with the requirements of Section 724.987.
2) Whenever a hazardous waste is in the tank, the fixed roof must
be installed with each closure device secured in the closed position and the
vapor headspace underneath the fixed roof vented to the control device, except
as follows:
A) Venting to the control device is not required, and opening of
closure devices or removal of the fixed roof is allowed at the following times:
i) To provide access to the tank for performing routine
inspection, maintenance, or other activities needed for normal operations.
Examples of such activities include those times when a worker needs to open a
port to sample liquid in the tank, or when a worker needs to open a hatch to
maintain or repair equipment. Following completion of the activity, the owner
or operator must promptly secure the closure device in the closed position or
reinstall the cover, as applicable, to the tank.
ii) To remove accumulated sludge or other residues from the
bottom of a tank.
B) Opening of a safety device, as defined in 35 Ill. Adm. Code
725.981, is allowed at any time conditions require doing so to avoid an unsafe
condition.
3) The owner or operator must inspect and monitor the air
emission control equipment in accordance with the following procedures:
A) The fixed roof and its closure devices must be visually
inspected by the owner or operator to check for defects that could result in
air pollutant emissions. Defects include, but are not limited to, any of the
following: visible cracks, holes, or gaps in the roof sections or between the
roof and the tank wall; broken, cracked, or otherwise damaged seals or gaskets
on closure devices; and broken or missing hatches, access covers, caps, or
other closure devices.
B) The closed-vent system and control device must be inspected and
monitored by the owner or operator in accordance with the procedures specified
in Section 724.987.
C) The owner or operator must perform an initial inspection of the
air emission control equipment on or before the date that the tank becomes
subject to this Section. Thereafter, the owner or operator must perform the
inspections at least once every year except for the special conditions provided
for in subsection (l).
D) In the event that a defect is detected, the owner or operator must
repair the defect in accordance with the requirements of subsection (k).
E) The owner or operator must maintain a record of the inspection
in accordance with the requirements specified in Section 724.989(b).
h) The owner or operator that controls air pollutant emissions by
using a pressure tank must meet the following requirements:
1) The tank must be designed not to vent to the atmosphere as a
result of compression of the vapor headspace in the tank during filling of the
tank to its design capacity.
2) All tank openings must be equipped with closure devices
designed to operate with no detectable organic emissions, as determined using
the procedure specified in Section 724.983(d).
3) Whenever a hazardous waste is in the tank, the tank must be
operated as a closed-vent system that does not vent to the atmosphere, except
under either of the following two conditions:
A) The tank does not need to be operated as a closed-vent system
at those times when the opening of a safety device, as defined in 35 Ill. Adm.
Code 725.981, is required to avoid an unsafe condition.
B) The tank does not need to be operated as a closed-vent system
at those times when the purging of inerts from the tank is required and the
purge stream is routed to a closed-vent system and control device designed and
operated in accordance with the requirements of Section 724.987.
i) The owner or operator that controls air pollutant emissions
by using an enclosure vented through a closed-vent system to an enclosed
combustion control device must meet the requirements specified in subsections
(i)(1) through (i)(4).
1) The tank must be located inside an enclosure. The enclosure
must be designed and operated in accordance with the criteria for a permanent
total enclosure, as specified in "Procedure T – Criteria for and
Verification of a Permanent or Temporary Total Enclosure" under appendix B
to 40 CFR 52.741 (VOM Measurement Techniques for Capture Efficiency),
incorporated by reference in 35 Ill. Adm. Code 720.111(b). The enclosure may
have permanent or temporary openings to allow worker access; passage of
material into or out of the enclosure by conveyor, vehicles, or other
mechanical means; entry of permanent mechanical or electrical equipment; or
direct airflow into the enclosure. The owner or operator must perform the
verification procedure for the enclosure, as specified in Section 5.0 to
"Procedure T – Criteria for and Verification of a Permanent or Temporary
Total Enclosure", initially when the enclosure is first installed and,
thereafter, annually.
2) The enclosure must be vented through a closed-vent system to
an enclosed combustion control device that is designed and operated in
accordance with the standards for either a vapor incinerator, boiler, or
process heater specified in Section 724.987.
3) Safety devices, as defined in 35 Ill. Adm. Code 725.981, may
be installed and operated as necessary on any enclosure, closed-vent system, or
control device used to comply with the requirements of subsections (i)(1) and
(i)(2).
4) The owner or operator must inspect and monitor the closed-vent
system and control device, as specified in Section 724.987.
j) The owner or operator must transfer hazardous waste to a tank
subject to this Section in accordance with the following requirements:
1) Transfer of hazardous waste, except as provided in subsection
(j)(2), to the tank from another tank subject to this Section or from a surface
impoundment subject to Section 724.985 must be conducted using continuous
hard-piping or another closed system that does not allow exposure of the
hazardous waste to the atmosphere. For the purpose of complying with this
provision, an individual drain system is considered to be a closed system when
it meets the requirements of subpart RR of 40 CFR 63 (National Emission
Standards for Individual Drain Systems), incorporated by reference in 35 Ill.
Adm. Code 720.111(b).
2) The requirements of subsection (j)(1) do not apply when
transferring a hazardous waste to the tank under any of the following
conditions:
A) The hazardous waste meets the average VO concentration
conditions specified in Section 724.982(c)(1) at the point of waste
origination.
B) The hazardous waste has been treated by an organic destruction
or removal process to meet the requirements in Section 724.982(c)(2).
C) The hazardous waste meets the requirements of Section
724.982(c)(4).
k) The owner or operator must repair each defect detected during
an inspection performed in accordance with the requirements of subsection
(c)(4), (e)(3), (f)(3), or (g)(3), as follows:
1) The owner or operator must make first efforts at repair of the
defect no later than five calendar days after detection, and repair must be
completed as soon as possible but no later than 45 calendar days after
detection except as provided in subsection (k)(2).
2) Repair of a defect may be delayed beyond 45 calendar days if
the owner or operator determines that repair of the defect requires emptying or
temporary removal from service of the tank and no alternative tank capacity is
available at the site to accept the hazardous waste normally managed in the
tank. In this case, the owner or operator must repair the defect the next time
the process or unit that is generating the hazardous waste managed in the tank
stops operation. Repair of the defect must be completed before the process or
unit resumes operation.
l) Following the initial inspection and monitoring of the cover,
as required by the applicable provisions of this Subpart CC, subsequent
inspection and monitoring may be performed at intervals longer than one year
under the following special conditions:
1) In the case when inspecting or monitoring the cover would
expose a worker to dangerous, hazardous, or other unsafe conditions, then the
owner or operator may designate a cover as an "unsafe to inspect and
monitor cover" and comply with all of the following requirements:
A) Prepare a written explanation for the cover stating the reasons
why the cover is unsafe to visually inspect or to monitor, if required.
B) Develop and implement a written plan and schedule to inspect
and monitor the cover, using the procedures specified in the applicable Section
of this Subpart CC, as frequently as practicable during those times when a
worker can safely access the cover.
2) In the case when a tank is buried partially or entirely
underground, an owner or operator is required to inspect and monitor, as
required by the applicable provisions of this Section, only those portions of
the tank cover and those connections to the tank (e.g., fill ports, access
hatches, gauge wells, etc.) that are located on or above the ground surface.