Table 4 to Subpart HHHHHHH of Part 63--Summary of Control
Requirements for Storage Vessels at New and Existing Sources
Table 5 to Subpart HHHHHHH of Part 63--Applicability of the General
Provisions to Part 63
Table 6 to Subpart HHHHHHH of Part 63--Operating Parameters,
Operating Limits, and Data Monitoring, Recording, and Compliance
Frequencies for Process Vent Control Devices, Resin Strippers, and
Wastewater Treatment Processes.
Table 7 to Subpart HHHHHHH of Part 63--Toxic Equivalency Factors
Table 8 to Subpart HHHHHHH of Part 63--Calibration and Accuracy
Requirements for Continuous Parameter Monitoring Systems
Table 9 to Subpart HHHHHHH of Part 63--Methods and Procedures for
Conducting Performance Tests for Process Vents
Table 10 to Subpart HHHHHHH of Part 63--Methods and Procedures for
Conducting Performance Tests for Stripped Resin and Wastewater

Subpart HHHHHHH--National Emission Standards for Hazardous Air
Pollutant Emissions for Polyvinyl Chloride and Copolymers
Production

What This Subpart Covers

Sec.  63.11860  What is the purpose of this subpart?

    This subpart establishes national emission standards for hazardous
air pollutants emitted from the production of polyvinyl chloride and
copolymers. This subpart also establishes requirements to demonstrate
initial and continuous compliance with the emission standards.

Sec.  63.11865  Am I subject to the requirements in this subpart?

    You are subject to this subpart if you own or operate a polyvinyl
chloride and copolymers process unit (PVCPU) as defined in Sec.
63.12005 that is located at, or is part of, a major source or an area
source as defined in Sec.  63.2. Your PVCPU is not subject to this
subpart if it is a research and development facility, as defined in
section 112(c)(7) of the Clean Air Act.

Sec.  63.11870  What is the affected source of this subpart?

    (a) The affected source for this subpart is each individual PVCPU.
    (b) An existing affected source is one for which construction was
commenced before May 20, 2011 at a major or area source.
    (c) A new affected source is one for which construction is
commenced on or after May 20, 2011 at a major or area source.
    (d) If components of an existing affected source are replaced such
that the replacement meets the definition of reconstruction in Sec.
63.2 and the reconstruction commenced on or after May 20, 2011, then
the existing affected source becomes a reconstructed source and is
subject to the relevant standards for a new affected source. The
reconstructed source must comply with the requirements for a new
affected source upon initial startup of the reconstructed source or by
the effective date of publication of the final rule in the Federal
Register, whichever is later.

Sec.  63.11871  What is the relationship to 40 CFR part 61, subpart F?

    After the applicable compliance date specified in Sec.
63.11875(a), (b), or (c), an affected source that is also subject to
the provisions of 40 CFR part 61, subpart F, is required to comply with
the provisions of this subpart and not 40 CFR part 61, subpart F.

Sec.  63.11875  When must I comply with this subpart?

    (a) If you own or operate an existing affected source, you must
achieve compliance with the applicable provisions in this subpart no
later than 3 years after the effective date of publication of the final
rule in the Federal Register. On or after the date 3 years after the
effective date of publication of the final rule in the Federal
Register, any such existing affected source is no longer subject to the
provisions of 40 CFR part 61, subpart F.
    (b) If you start up a new affected source on or before the
effective date of publication of the final rule in the Federal
Register, you must achieve compliance with the provisions of this
subpart no later than the effective date of publication of the final
rule in the Federal Register. On or after the effective date of
publication of the final rule in the Federal Register, any such new
affected source is not subject to the provisions of 40 CFR part 61,
subpart F.
    (c) If you start up a new affected source after the effective date
of publication of the final rule in the Federal Register, you must
achieve compliance with the provisions of this subpart upon startup of
your affected source. Upon startup, any such new affected source is not
subject to the provisions of 40 CFR part 61, subpart F.
    (d) You must meet the notification requirements in Sec. Sec.  63.9
and 63.11985 according to the dates specified in those sections. Some
of the notifications must be submitted before you are required to
comply with the emission limits and standards in this subpart.

Emission Limits, Operating Limits, and Work Practice Standards

Sec.  63.11880  What emission limits, operating limits, and standards
must I meet?

    (a) You must comply with each emission limit and standard specified
in Tables 1, 3, and 4 to this subpart that applies to your existing
affected source, and you must comply with each emission limit and
standard specified in Tables 2, 3, and 4 to this subpart that applies
to your new affected source.
    (b) You must establish an operating limit for each operating
parameter required to be monitored in Sec. Sec.  63.11925, 63.11960,
63.11970, and 63.11975. As specified in those sections, you must
establish each operating limit as an operating range, minimum operating
level, or maximum operating level. You must comply with each
established operating limit.
    (c) You must comply with the emission limits and standards
specified

in Sec. Sec.  63.11910 through 63.11980 that apply to your affected
source.

General Compliance Requirements

Sec.  63.11885  What parts of the General Provisions apply to me?

    Table 5 to this subpart specifies which parts of the General
Provisions in subpart A of this part apply to you.

Sec.  63.11890  What are my additional general requirements for
complying with this subpart?

    (a) The emission limits, operating limits, and work practice
standards specified in this subpart apply at all times, including
periods of SSM.
    (b) At all times, you must operate and maintain your affected
source, including associated air pollution control components and
monitoring system components, in a manner consistent with safety and
good air pollution control practices for minimizing emissions.
Determination of whether acceptable operation and maintenance
procedures are being used will be based on information available to the
Administrator, which may include, but is not limited to, monitoring
results, review of operation and maintenance procedures, review of
operation and maintenance records, and inspection of the source.
    (c) You must install, calibrate, maintain, and operate all
monitoring system components according to Sec.  63.8, Sec.  63.11935(b)
and (c), and paragraphs (c)(1) and (2) of this section.
    (1) Except for periods of monitoring system malfunctions, repairs
associated with monitoring system malfunctions, and required monitoring
system quality assurance or quality control activities (including, as
applicable, calibration checks and required zero and span adjustments),
you must operate the continuous monitoring system at all times the
affected source is operating. A monitoring system malfunction is any
sudden, infrequent, not reasonably preventable failure of the
monitoring system to provide data. Monitoring system failures that are
caused in part by poor maintenance or careless operation are not
malfunctions. You are required to complete monitoring system repairs in
response to monitoring system malfunctions and to return the monitoring
system to operation as expeditiously as practicable.
    (2) You may not use data recorded during monitoring system
malfunctions, repairs associated with monitoring system malfunctions,
or required monitoring system quality assurance or control activities
in calculations used to report emissions or operating levels. You must
use all the data collected during all other required data collection
periods in assessing the operation of the control device and associated
control system. You must report any periods for which the monitoring
system failed to collect required data.
    (d) A deviation means any of the cases listed in paragraphs (d)(1)
through (7) of this section.
    (1) Any instance in which an affected source subject to this
subpart, or an owner or operator of such a source, fails to meet any
requirement or obligation established by this subpart, including, but
not limited to, any emission limit, operating limit, or work practice
standard.
    (2) When a performance test indicates that emissions of a pollutant
in Table 1, 2, or 3 to this subpart are exceeding the emission standard
for the pollutant specified in Table 1, 2, or 3 to this subpart.
    (3) When a 3-hour block average from a continuous emissions
monitor, as required by Sec.  63.11925(c), exceeds an emission limit in
Table 1 or 2 to this subpart.
    (4) When the average value of a monitored operating parameter,
based on the data averaging period for compliance specified in Table 6
to this subpart, does not meet the operating limit established in Sec.
63.11880(b).
    (5) When an affected source discharges to the atmosphere from any
of the sources specified in paragraphs (d)(5)(i) through (iv) of this
section.
    (i) A pressure relief device, as defined in Sec.  63.12005.
    (ii) A bypass, as defined in Sec.  63.12005.
    (iii) A closed vent system in vacuum service.
    (iv) A closure device on a pressure vessel.
    (6) Any instance in which the affected source subject to this
subpart, or an owner or operator of such a source, fails to meet any
term or condition specified in paragraph (d)(6)(i) or (ii) of this
section.
    (i) Any term or condition that is adopted to implement an
applicable requirement in this subpart.
    (ii) Any term or condition that is included in the operating permit
for any affected source required to obtain such a permit.
    (7) Any failure to collect required data, except for periods of
monitoring system malfunctions, repairs associated with monitoring
system malfunctions, and required monitoring system quality assurance
or quality control activities (including, as applicable, calibration
checks and required zero and span adjustments).

Sec.  63.11895  How do I establish an affirmative defense for
exceedance of an emission limit during malfunction?

    In response to an action to enforce the standards set forth in
Sec.  63.11880, you may assert an affirmative defense to a claim for
civil penalties for exceedances of such standards that are caused by
malfunction, as defined in Sec.  63.2. Appropriate penalties may be
assessed, however, if you fail to meet your burden of proving all of
the requirements in the affirmative defense. The affirmative defense
shall not be available for claims for injunctive relief.
    (a) To establish the affirmative defense in any action to enforce
such a limit, you must timely meet the notification requirements in
paragraph (b) of this section, and must prove by a preponderance of
evidence that:
    (1) The excess emissions:
    (i) Were caused by a sudden, infrequent, and unavoidable failure of
air pollution control and monitoring system devices, process
components, or a process to operate in a normal or usual manner; and
    (ii) Could not have been prevented through careful planning, proper
design, or better operation and maintenance practices; and
    (iii) Did not stem from any activity or event that could have been
foreseen and avoided, or planned for; and
    (iv) Were not part of a recurring pattern indicative of inadequate
design, operation, or maintenance; and
    (2) Repairs were made as expeditiously as possible when the
applicable emission limitations were being exceeded. Off shift and
overtime labor were used, to the extent practicable to make these
repairs; and
    (3) The frequency, amount, and duration of the excess emissions
(including any bypass) were minimized to the maximum extent practicable
during periods of such emissions; and
    (4) If the excess emissions resulted from a bypass of control
device components or a process, then the bypass was unavoidable to
prevent loss of life, personal injury, or severe property damage; and
    (5) All possible steps were taken to minimize the impact of the
excess emissions on ambient air quality, the environment, and human
health; and
    (6) All emissions monitoring and control systems were kept in
operation, if at all possible, consistent with safety and good air
pollution control practices; and
    (7) All of the actions in response to the excess emissions were
documented by properly signed, contemporaneous operating logs; and

    (8) At all times, the facility was operated in a manner consistent
with good practices for minimizing emissions; and
    (9) A written root cause analysis has been prepared, the purpose of
which is to determine, correct, and eliminate the primary causes of the
malfunction and the excess emissions resulting from the malfunction
event at issue. The analysis must also specify, using best monitoring
methods and engineering judgment, the amount of excess emissions that
were the result of the malfunction.
    (b) The owner or operator of the facility experiencing an
exceedance of its emission limit(s) during a malfunction must notify
the Administrator by telephone or facsimile (FAX) transmission as soon
as possible, but no later than 2 working days after the initial
occurrence of the malfunction, if it wishes to avail itself of an
affirmative defense to civil penalties for that malfunction. The owner
or operator seeking to assert an affirmative defense must also submit a
written report to the Administrator within 45 days of the initial
occurrence of the exceedance of the standard in Sec.  63.11880 to
demonstrate, with all necessary supporting documentation, that it has
met the requirements set forth in paragraph (a) of this section. The
owner or operator may seek an extension of this deadline for up to 30
additional days by submitting a written request to the Administrator
before the expiration of the 45-day period. Until a request for an
extension has been approved by the Administrator, the owner or operator
is subject to the requirement to submit such report within 45 days of
the initial occurrence of the exceedance.

Sec.  63.11896  What am I required to do if I make a process change to
a PVCPU at my affected source?

    If you make a process change to an existing affected source that
does not meet the criteria to become a new affected source in Sec.
63.11870(c), you must comply with the requirements in paragraph (a) of
this section. If you make a process change to a new affected source,
you must comply with the requirements in paragraph (b) of this section.
If you must comply with the provisions of paragraph (a) or (b) of this
section, you must also meet the testing and reporting requirements in
paragraphs (c) and (d) of this section. Refer to Sec.  63.12005 for the
definition of process changes.
    (a) If you replace any components of an existing affected source or
make a process change to an existing affected source resulting in a
change to the characteristics of any emission point, such that a
different emission limit, operating parameter limit, or work practice
requirement applies, and the criteria to become a new affected source
in Sec.  63.11870(c) are not met, you must demonstrate that the changed
or added emission point is in compliance with the applicable
requirements for an existing affected source. You must demonstrate
initial compliance with the emission limits and establish any
applicable operating limits in Sec.  63.11880 within 180 days of the
date of start-up of the changed process unit. You must demonstrate
compliance with any applicable work practice standards upon startup of
the changed process unit.
    (b) If you replace any components of a new affected source, or make
a process change to a new affected source resulting in a change to the
characteristics of any emission point, such that a different emission
limit, operating parameter limit, or work practice requirement applies,
you must demonstrate that all changed emission points are in compliance
with the applicable requirements for a new affected source. You must
demonstrate initial compliance with the emission limits and establish
any applicable operating limits in Sec.  63.11880 within 180 days of
the date of startup of the changed process unit. You must demonstrate
compliance with any applicable work practice standards upon startup of
the changed process unit.
    (c) For process changes, you must demonstrate continuous compliance
with your emission limits and standards, operating limits, and work
practice standards according to the procedures and frequency in
Sec. Sec.  63.11910 through 63.11980.
    (d) For process changes, you must submit the report specified in
Sec.  63.11985(b)(4)(iii).

Testing and Compliance Requirements

Sec.  63.11900  By what date must I conduct initial performance testing
and monitoring, establish any applicable operating limits, and
demonstrate initial compliance with my emission limits and work
practice standards?

    (a) For existing affected sources, you must establish any
applicable operating limits required in Sec.  63.11880 and demonstrate
initial compliance with the emission limits and standards specified in
Tables 1, 3, and 4 to this subpart, as applicable, no later than 180
days after the compliance date specified in Sec.  63.11875 and
according to the applicable provisions in Sec.  63.7(a)(2).
    (b) For existing affected sources, you must demonstrate initial
compliance with any applicable work practice standards required in
Sec.  63.11880 no later than the compliance date specified in Sec.
63.11875 and according to the applicable provisions in Sec.
63.7(a)(2).
    (c) For new or reconstructed affected sources, you must establish
any applicable operating limits required in Sec.  63.11880, and
demonstrate initial compliance with the emission limits and standards
specified in Tables 2, 3, and 4 to this subpart, as applicable, no
later than 180 days after the effective date of publication of the
final rule in the Federal Register or within 180 days after startup of
the source, whichever is later, according to Sec.  63.7(a)(2)(ix).
    (d) For new and reconstructed affected sources, you must
demonstrate initial compliance with any applicable work practice
standards required in Sec.  63.11880 no later than the startup date of
the affected source or the effective date of publication of the final
rule in the Federal Register, whichever is later, and according to the
applicable provisions in Sec.  63.7(a)(2).
    (e) If you demonstrate initial compliance using a performance test
and a force majeure is about to occur, occurs, or has occurred for
which you intend to assert a claim of force majeure, then you must
follow the procedures in Sec.  63.7(a)(4).

Sec.  63.11905  When must I conduct subsequent performance testing and
monitoring to demonstrate continuous compliance?

    Following the date of your initial demonstration of compliance in
Sec.  63.11900, you must conduct subsequent performance testing and
monitoring to demonstrate continuous compliance with your emission
limits, operating limits, and work practice standards according to the
procedures and frequency in Sec. Sec.  63.11910 through 63.11980. If
you make a process change as specified in Sec.  63.11896, such that a
different emission limit or operating parameter limit applies, you must
conduct a performance test according to Sec.  63.11896.

Sec.  63.11910  What are my initial and continuous compliance
requirements for storage vessels?

    You must comply with the requirements specified in Table 4 to this
subpart for each storage vessel.
    (a) For each fixed roof storage vessel used to comply with the
requirements specified in Table 4 to this subpart, you must meet the
requirements in paragraphs (a)(1) through (4) of this section. If you
elect to use a fixed roof storage vessel vented to a closed vent

system and control device, the closed vent system and control device
must meet the requirements in Sec. Sec.  63.11925 through 63.11950.
    (1) Design requirements. (i) The fixed roof must be installed in a
manner such 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.
    (ii) Each opening in the fixed roof must be equipped with a closure
device designed to operate such 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.
    (2) Operating requirements. (i) Except as specified in paragraph
(a)(2)(ii) of this section, the fixed roof must be installed with each
closure device secured in the closed position.
    (ii) Opening of closure devices or removal of the fixed roof is
allowed under conditions specified in paragraphs (a)(2)(ii)(A) and (B)
of this section.
    (A) A closure device may be opened or the roof may be removed when
needed to provide access.
    (B) A conservation vent that vents to the atmosphere is allowed
during normal operations to maintain the tank internal operating
pressure within tank design specifications. Normal operating conditions
that may require these devices to open are during those times when the
internal pressure of the storage vessel is outside the internal
pressure operating range for the storage vessel as a result of loading
or unloading operations or diurnal ambient temperature fluctuations.
    (3) Inspection and monitoring requirements. (i) Visually inspect
the fixed roof and its closure devices for defects initially and at
least once per calendar year except as specified in paragraph
(a)(3)(ii) of this section. Defects include, but are not limited to,
visible cracks, holes, or gaps in the roof sections or between the roof
and the wall of the storage vessel; 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 inspection requirement specified in paragraph (a)(3)(i) of
this section does not apply to parts of the fixed roof that you
determine are unsafe to inspect because operating personnel would be
exposed to an imminent or potential danger as a consequence of
complying with paragraph (a)(3)(i) of this section, provided you comply
with the requirements specified in paragraphs (a)(3)(ii)(A) and (B) of
this section.
    (A) You prepare and maintain at the plant site written
documentation that identifies all parts of the fixed roof that are
unsafe to inspect and explains why such parts are unsafe to inspect.
    (B) You develop and implement a written plan and schedule to
conduct inspections the next time alternative storage capacity becomes
available and the storage vessel can be emptied or temporarily removed
from service, as necessary, to complete the inspection. The required
inspections must be performed as frequently as practicable but do not
need to be performed more than once per calendar year. You must
maintain a copy of the written plan and schedule at the plant site.
    (4) Repair requirements. (i) Make first efforts to repair a defect
no later than 5 days after detection, and complete repair as soon as
possible, but no later than 45 days after detection. You must comply
with the requirements in this paragraph (a)(4)(i) except as provided in
paragraph (a)(4)(ii) of this section.
    (ii) Repair of a defect may be delayed beyond 45 days if you
determine that repair of the defect requires emptying or temporary
removal from service of the storage vessel and no alternative storage
capacity is available at the site to accept the removed material. In
this case, repair the defect the next time alternative storage capacity
becomes available and the storage vessel can be emptied or temporarily
removed from service.
    (b) If you elect to use an internal floating roof storage vessel or
external floating roof storage vessel to comply with the requirements
specified in Table 4 to this subpart, you must meet all requirements of
Sec. Sec.  63.1060 through 63.1067 of subpart WW of this part for
internal floating roof storage vessels or external floating roof
storage vessels, as applicable.
    (c) For each pressure vessel used to comply with the requirements
specified in Table 4 to this subpart, you must meet the requirements in
paragraphs (c)(1) through (4) of this section.
    (1) Whenever the pressure vessel is in hazardous air pollutants
(HAP) service, you must operate the pressure vessel as a closed system
that does not vent to the atmosphere, e.g., during filling, emptying,
and purging. The vent stream during filling, emptying, and purging must
meet the process vent emission limits in Table 1 or 2 to this subpart,
as applicable, by routing to a closed vent system and control device
that is designed and operated in accordance with Sec. Sec.  63.11925
through 63.11950.
    (2) Each opening in the pressure vessel must be equipped with a
closure device designed to operate such 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.
    (3) All potential leak interfaces must be monitored annually for
leaks using the procedures specified in Sec.  63.11915. You must comply
with the recordkeeping provisions specified in Sec.  63.11990(b) and
the reporting provisions specified in Sec.  63.11985(a)(1), (b)(1), and
(c)(8). For any leak detected, you must submit the report specified in
paragraph (c)(4) of this section.
    (4) Pressure vessel closure devices must not discharge to the
atmosphere. Any such release (e.g., leak) constitutes a violation of
this rule. Within 10 days of any such release, you must submit to the
Administrator the report specified in Sec.  63.11985(c)(8). This report
is required even if you elect to follow the procedures specified in
Sec.  63.11895 to establish an affirmative defense.

Sec.  63.11915  What are my compliance requirements for equipment
leaks?

    For equipment (as defined in Sec.  63.12005) in HAP service, you
must comply with the requirements in paragraphs (a) through (c) of this
section.
    (a) Requirement for certain equipment in subpart UU of this part.
You must comply with Sec. Sec.  63.1020 through 63.1025, Sec.  63.1027,
and Sec. Sec.  63.1029 through 63.1039 of subpart UU of this part.
    (b) Requirements for pumps, compressors, and agitator seals. You
must meet the requirements specified for each type of equipment in
paragraphs (b)(1) through (5) of this section. For each type of
equipment specified in paragraphs (b)(1) through (5) of this section,
you must also meet the requirements of paragraph (a) of this section.
    (1) Rotating pumps. HAP emissions from seals on all rotating pumps
in HAP service are to be minimized by installing sealless pumps, pumps
with double mechanical seals or equivalent equipment, or procedures
approved by the Administrator. If double mechanical seals are used, HAP
emissions from the seals are to be minimized by maintaining the
pressure between the two seals so that any leak that occurs is into the
pump; by ducting any HAP between the two seals through a control system
from which the concentration of HAP in the exhaust gases does not
exceed 10 parts per million; or

equivalent equipment or procedures approved by the Administrator.
    (2) Reciprocating pumps. HAP emissions from seals on all
reciprocating pumps in HAP service are to be minimized by installing
double outboard seals, or equivalent equipment or procedures approved
by the Administrator. If double outboard seals are used, HAP emissions
from the seals are to be minimized by maintaining the pressure between
the two seals so that any leak that occurs is into the pump; by ducting
any HAP between the two seals through a control system from which the
concentration of HAP in the exhaust gases does not exceed 10 ppm; or
equivalent equipment or procedures approved by the Administrator.
    (3) Rotating compressors. HAP emissions from seals on all rotating
compressors in HAP service are to be minimized by installing
compressors with double mechanical seals, or equivalent equipment, or
procedures approved by the Administrator. If double mechanical seals
are used, HAP emissions from the seals are to be minimized by
maintaining the pressure between the two seals so that any leak that
occurs is into the compressor; by ducting any HAP between the two seals
through a control system from which the concentration of HAP in the
exhaust gases does not exceed 10 ppm; or equivalent equipment or
procedures approved by the Administrator.
    (4) Reciprocating compressors. HAP emissions from seals on all
reciprocating compressors in HAP service are to be minimized by
installing double outboard seals, or equivalent equipment, or
procedures approved by the Administrator. If double outboard seals are
used, HAP emissions from the seals are to be minimized by maintaining
the pressure between the two seals so that any leak that occurs is into
the compressor; by ducting any HAP between the two seals through a
control system from which concentration of HAP in the exhaust gases
does not exceed 10 ppm; or equivalent equipment or procedures approved
by the Administrator.
    (5) Agitators. HAP emissions from seals on all agitators in HAP
service are to be minimized by installing agitators with double
mechanical seals, or equivalent equipment, or procedures approved by
the Administrator. If double mechanical seals are used, HAP emissions
from the seals are to be minimized by maintaining the pressure between
the two seals so that any leak that occurs is into the agitated vessel;
by ducting any HAP between the two seals through a control system from
which the concentration of HAP in the exhaust gases does not exceed 10
ppm; or equivalent equipment or procedures approved by the
Administrator.
    (c) Requirements for pressure relief devices. For pressure relief
devices, you must meet the requirements of this paragraph (c) and
paragraph (a) of this section. Any release to the atmosphere from a
pressure relief device in HAP service, as defined in Sec.  63.12005,
constitutes a violation of this rule. You must install, maintain, and
operate release indicators as specified in paragraphs (c)(1) and (2) of
this section unless the pressure relief device meets the process vent
emission limits in Table 1 or 2 to this subpart by routing to a closed
vent system and control device designed and operated in accordance with
the requirements in Sec. Sec.  63.11925 through 63.11950. For any
pressure relief devices, you must comply with the recordkeeping
provisions in Sec.  63.11990(c) and reporting provisions in Sec. Sec.
63.11985(a)(2), (b)(2), and (c)(8). For any release, you must submit
the report specified in Sec.  63.11985(c)(8), as described in paragraph
(c)(3) of this section.
    (1) A release indicator must be properly installed on each pressure
relief device in such a way that it will indicate when an emission
release has occurred.
    (2) Each indicator must be equipped with an alert system that will
notify an operator immediately and automatically when the pressure
relief device is open. The alert must be located such that the signal
is detected and recognized easily by an operator.
    (3) For any instance that the release indicator indicates that a
pressure relief device is open, you must notify operators that a
pressure release has occurred, and, within 10 days of the release, you
must submit to the Administrator the report specified in Sec.
63.11985(c)(8). This report is required even if you elect to follow the
procedures specified in Sec.  63.11895(b) to establish an affirmative
defense.

Sec.  63.11920  What are my initial and continuous compliance
requirements for heat exchange systems?

    (a) Except as provided in paragraph (b) of this section, you must
perform monitoring to identify leaks of total strippable volatile
organic compounds from each heat exchange system subject to the
requirements of this subpart according to the procedures in paragraphs
(a)(1) through (4) of this section.
    (1) Monitoring locations for closed-loop recirculation heat
exchange systems. You must collect and analyze a sample from the
location(s) described in either paragraph (a)(1)(i) or (ii) of this
section.
    (i) Each cooling tower return line prior to exposure to air for
each heat exchange system.
    (ii) Selected heat exchanger exit line(s) so that each heat
exchanger or group of heat exchangers within a heat exchange system is
covered by the selected monitoring location(s).
    (2) Monitoring locations for once-through heat exchange systems.
You must collect and analyze a sample from the location(s) described in
paragraph (a)(2)(i) of this section. You may also elect to collect and
analyze an additional sample from the location(s) described in
paragraph (a)(2)(ii) of this section.
    (i) Selected heat exchanger exit line(s) so that each heat
exchanger or group of heat exchangers within a heat exchange system is
covered by the selected monitoring location(s).
    (ii) The inlet water feed line for a once-through heat exchange
system prior to any heat exchanger. If multiple heat exchange systems
use the same water feed (i.e., inlet water from the same primary water
source), you may monitor at one representative location and use the
monitoring results for that sampling location for all heat exchange
systems that use that same water feed.
    (3) Monitoring method. Determine the total strippable volatile
organic compounds concentration at each monitoring location using the
analytical method specified in either paragraph (a)(3)(i) or (ii) of
this section.
    (i) Determine the total strippable volatile organic compounds
concentration (in parts per million by volume) as methane from the air
stripping testing system using ``Air Stripping Method (Modified El Paso
Method) for Determination of Volatile Organic Compound Emissions from
Water Sources,'' Revision Number One, dated January 2003, Sampling
Procedures Manual, Appendix P: Cooling Tower Monitoring, prepared by
Texas Commission on Environmental Quality, January 31, 2003
(incorporated by reference, see Sec.  63.14) using a flame ionization
detector analyzer.
    (ii) Determine the total strippable volatile organic compounds
concentration (in parts per billion by weight) in the cooling water
using Method 8021B, ``Aromatic and Halogenated Volatiles by Gas
Chromatography Using Photoionization and/or Electrolytic Conductivity
Detectors,'' dated December 1996 (incorporated by reference, see Sec.
63.14). The target list of compounds shall be generated based on a pre-
survey sample

and analysis by gas chromatography/mass spectrometry and process
knowledge to include all compounds that can potentially leak into the
cooling water. If Method 8021B, ``Aromatic and Halogenated Volatiles by
Gas Chromatography Using Photoionization and/or Electrolytic
Conductivity Detectors,'' dated December 1996 (incorporated by
reference, see Sec.  63.14) is not applicable for all compounds that
can potentially leak into the cooling water for a given heat exchange
system, you cannot use this monitoring method for that heat exchange
system.
    (4) Monitoring frequency. Determine the total strippable volatile
organic compounds concentration at each monitoring location at the
frequencies specified in paragraphs (a)(4)(i) through (iii) of this
section.
    (i) For heat exchange systems for which you have not delayed repair
of any leaks, monitor at the frequencies specified in paragraphs
(a)(4)(i)(A) and (B) of this section.
    (A) For heat exchange systems at an existing affected source,
monitor at least monthly. You may elect to monitor more frequently than
the minimum frequency specified in this paragraph (a)(4)(i)(A).
    (B) For heat exchange systems at a new affected source, monitor at
least once every 12 hours. You may elect to monitor more frequently
than the minimum frequency specified in this paragraph (a)(4)(i)(B).
    (ii) For heat exchange systems for which you have delayed repair,
as provided in paragraph (f) of this section, monitor at least monthly.
You may elect to monitor more frequently than the minimum frequency
specified in this paragraph (a)(4)(ii).
    (iii) If you elected to monitor the inlet water feed line for a
once-through heat exchange system, as provided in paragraph (a)(2)(ii)
of this section, you must monitor the inlet water feed line at the same
frequency used to monitor the heat exchange exit line(s), as required
in paragraph (a)(2)(i) of this section.
    (b) A heat exchange system is exempt from the monitoring
requirements in paragraph (a) of this section if it meets the criteria
in either paragraph (b)(1) or (2) of this section.
    (1) All heat exchangers within the heat exchange system operate
with the minimum pressure on the cooling water side at least 35
kilopascals greater than the maximum pressure on the process side.
    (2) The heat exchange system does not contain any heat exchangers.
    (c) The leak action level is specified in paragraphs (c)(1) and (2)
of this section.
    (1) For a heat exchange system at an existing affected source, the
leak action level is a total strippable volatile organic compounds
concentration (as methane) in the stripping gas of 2.9 parts per
million by volume or a total strippable volatile organic compounds
concentration in the cooling water of 38 parts per billion by weight.
    (2) For a heat exchange system at a new affected source, the leak
action level is a total strippable volatile organic compounds
concentration (as methane) in the stripping gas of 2.3 parts per
million by volume or a total strippable volatile organic compounds
concentration in the cooling water of 30 parts per billion by weight.
    (d) A leak is defined as specified in paragraph (d)(1) or (2) of
this section, as applicable.
    (1) For once-through heat exchange systems for which you monitor
the inlet water feed, as described in paragraph (a)(2)(ii) of this
section, a leak is detected if the difference in the measurement value
of the sample taken from a location specified in paragraph (a)(2)(i) of
this section and the measurement value of the corresponding sample
taken from the location specified in paragraph (a)(2)(ii) of this
section equals or exceeds the leak action level.
    (2) For all other heat exchange systems, a leak is detected if a
measurement value taken according to the requirements in paragraph (a)
of this section equals or exceeds the leak action level.
    (e) If a leak is detected, you must repair the leak to reduce the
measured concentration to below the applicable action level as soon as
practicable, but no later than 45 days after identifying the leak,
except as specified in paragraphs (f) and (g) of this section. Repair
includes re-monitoring as specified in paragraph (a) of this section to
verify that the measured concentration is below the applicable action
level. Actions that you can take to achieve repair include but are not
limited to any action specified in paragraphs (e)(1) through (5) of
this section.
    (1) Physical modifications to the leaking heat exchanger, such as
welding the leak or replacing a tube.
    (2) Blocking the leaking tube within the heat exchanger.
    (3) Changing the pressure so that water flows into the process
fluid.
    (4) Replacing the heat exchanger or heat exchanger bundle.
    (5) Isolating, bypassing, or otherwise removing the leaking heat
exchanger from service until it is otherwise repaired.
    (f) If you detect a leak when monitoring a cooling tower return
line or heat exchanger exit line under paragraph (a) of this section,
you may conduct additional monitoring following the requirements in
paragraph (a) of this section to further isolate each heat exchanger or
group of heat exchangers in regulated material service within the heat
exchange system for which the leak was detected. If you do not detect
any leaks when conducting additional monitoring for each heat exchanger
or group of heat exchangers, the heat exchange system is excluded from
repair requirements in paragraph (d) of this section.
    (g) The delay of repair action level is defined as either a total
strippable volatile organic compounds concentration (as methane) in the
stripping gas of 29 parts per million by volume or a total strippable
volatile organic compounds concentration in the cooling water of 380
parts per billion by weight. You may delay the repair of a leaking heat
exchanger when one of the conditions in paragraphs (g)(1) or (2) of
this section is met. You must determine if a delay of repair is
necessary as soon as practicable, but no later than 45 days after first
identifying the leak.
    (1) If the repair is technically infeasible without a shutdown and
the total strippable volatile organic compounds concentration is
initially and remains less than the delay of repair action level for
all monitoring periods during the delay of repair, you may delay repair
until the next scheduled shutdown of the heat exchange system. If,
during subsequent monitoring, the total strippable volatile organic
compounds concentration is equal to or greater than the delay of repair
action level, you must repair the leak within 30 days of the monitoring
event in which the total strippable volatile organic compounds was
equal to or exceeded the delay of repair action level.
    (2) If the necessary equipment, parts, or personnel are not
available and the total strippable volatile organic compounds
concentration (as methane) is initially and remains less than the delay
of repair action level for all monitoring periods during the delay of
repair, you may delay the repair for a maximum of 120 days from the day
the leak was first identified. You must demonstrate that the necessary
equipment, parts, or personnel were not available. If, during
subsequent monthly monitoring, the total strippable volatile organic
compounds concentration is

equal to or greater than the delay of repair action level, you must
repair the leak within 30 days of the monitoring event in which the
leak was equal to or exceeded the total strippable volatile organic
compounds delay of repair action level.
    (h) To delay the repair under paragraph (g) of this section, you
must record the information in paragraphs (h)(1) through (h)(4) of this
section.
    (1) The reason(s) for delaying repair.
    (2) A schedule for completing the repair as soon as practical.
    (3) The date and concentration of the leak as first identified and
the results of all subsequent monitoring events during the delay of
repair.
    (4) An estimate of the potential emissions from the leaking heat
exchange system following the procedures in paragraphs (g)(4)(i) and
(g)(4)(ii) of this section.
    (i) Determine the total strippable volatile organic compounds
concentration in the cooling water, in parts per billion by weight. If
the Modified El Paso Method is used, calculate the total strippable
volatile organic compounds concentration in the cooling water using
equation 7-1 from ``Air Stripping Method (Modified El Paso Method) for
Determination of Volatile Organic Compound Emissions from Water
Sources,'' Revision Number One, dated January 2003, Sampling Procedures
Manual, Appendix P: Cooling Tower Monitoring, prepared by Texas
Commission on Environmental Quality, January 31, 2003 (incorporated by
reference, see Sec.  63.14) and the total strippable volatile organic
compounds concentration measured in the stripped air.
    (ii) Calculate the emissions for the leaking heat exchange system
by multiplying the volatile organic compounds concentration in the
cooling water, parts per billion by weight, by the flow rate of the
cooling water at the selected monitoring location and by the expected
duration of the delay. The flow rate may be based on direct
measurement, pump curves, heat balance calculations, or other
engineering methods.

Sec.  63.11925  What are my initial and continuous compliance
requirements for process vents?

    Each process vent must meet the requirements of paragraphs (a)
through (f) of this section.
    (a) Emission limits. Each process vent stream must meet the
emission limits in Table 1 or 2 to this subpart prior to the vent
stream being exposed to the atmosphere. The emission limits in Table 1
or 2 to this subpart apply at all times.
    (b) Closed vent systems and control devices. Each control device
used to comply with paragraph (a) of this section must meet the
requirements of Sec. Sec.  63.11925 and 63.11940, and all process vent
streams treated by the control device must be routed through a closed
vent system meeting the requirements in Sec.  63.11930. You must not
use a flare to comply with the emission limits in Table 1 or 2 to this
subpart.
    (c) General monitoring requirements. Except as provided in
paragraphs (c)(1) through (3) of this section, for each control device
used to comply with the process vent emission limit specified in Table
1 or 2 to this subpart, you must install and operate a continuous
parameter monitoring systemsCPMS to monitor each operating parameter
specified in Sec.  63.11940(a) through (i) to comply with your
operating limit(s) required in Sec.  63.11880(b)
    (1) Hydrogen chloride continuous emission monitoring system (CEMS).
According to the schedule specified in paragraphs (c)(1)(i) through
(iii) of this section, respectively, new affected sources must comply
with paragraph (c)(1)(i) of this section, and existing affected sources
must comply with paragraph (c)(1)(ii) of this section, in lieu of
establishing operating limits in Sec.  63.11880(b) and using CPMS to
comply with the operating limits, as specified in Sec.  63.11940(a)
through (i).
    (i) New affected sources, beginning no more than 6-months after the
date of promulgation of a performance specification for hydrogen
chloride CEMS, must install and operate a hydrogen chloride CEMS to
demonstrate initial and continuous compliance with the hydrogen
chloride emission limit for process vents, as specified in paragraphs
(d)(2) through (4) and (e) of this section.
    (ii) Existing affected sources, upon promulgation of a performance
specification for hydrogen chloride CEMS, have the option to install a
hydrogen chloride CEMS to demonstrate initial and continuous compliance
with the hydrogen chloride emission limit for process vents, as
specified in paragraphs (d) and (e) of this section.
    (2) Dioxin/furan CEMS. According to the schedule specified in
paragraphs (c)(2)(i) through (iii) of this section, respectively, new
affected sources must comply with paragraph (c)(2)(i) of this section,
and existing affected sources must comply with paragraph (c)(1)(ii) of
this section, in lieu of establishing operating limits in Sec.
63.11880(b) and using CPMS to comply with the operating limits as
specified in Sec.  63.11940(a) through (i):
    (i) New affected sources, beginning no more than 6 months after the
date of promulgation of a performance specification for dioxin/furan
CEMS, must install and operate a dioxin/furan CEMS to demonstrate
initial and continuous compliance with the dioxin/furan emission limit
for process vents, as specified in paragraphs (d)(2) through (4) and
(e) of this section.
    (ii) Existing sources, upon promulgation of a performance
specification for dioxin/furan CEMS, have the option to install a
dioxin/furan CEMS to demonstrate initial and continuous compliance with
the dioxins/furan emission limit for process vents, as specified in
paragraphs (d)(2) through (4) and (e) of this section.
    (3) Total hydrocarbon CEMS. In lieu of establishing operating
limits in Sec.  63.11880(b) and using CPMS to comply with the operating
limits as specified in Sec.  63.11940(a) through (i), new and existing
affected sources have the option to install a total hydrocarbon CEMS to
demonstrate initial and continuous compliance with the total organic
HAP emission limit for process vents, as specified in paragraphs (d)(2)
through (4) and (e) of this section.
    (d) Initial compliance. To demonstrate initial compliance with the
process vent emission limits in Table 1 or 2 to this subpart, you must
comply with paragraphs (d)(1) through (5) of this section.
    (1) You must conduct an initial inspection as specified in Sec.
63.11930(d) for each closed vent system.
    (2) For each CEMS and CPMS required or that you elect to use as
specified in paragraph (c) of this section, you must prepare the
quality control program and site-specific performance evaluation test
plan specified in Sec.  63.11935(b) and site-specific monitoring plan
specified in Sec.  63.11935(c), respectively.
    (3) For each CEMS and CPMS specified in paragraph (d)(2) of this
section, you must install, operate, and maintain the CEMS and CPMS as
specified in Sec. Sec.  63.11935(b) and (c), respectively, and you must
conduct an initial site-specific performance evaluation test according
to your site-specific monitoring plan and Sec. Sec.  63.11935(b)(3) and
(c)(4), respectively.
    (4) For each emission limit for which you use a CEMS to demonstrate
compliance, you must demonstrate initial compliance with the emission
limits in Table 1 or 2 to this subpart based on 3-hour block averages
of CEMS data collected at the minimum

frequency specified in Sec. Sec.  63.11935(b)(2) and 63.11890(c), and
calculated using the data reduction method specified in Sec.
63.11935(e). For a CEMS used on a batch operation, you may use a data
averaging period based on an operating block in lieu of the 3-hour
averaging period.
    (5) For each emission limit for which you do not use a CEMS to
demonstrate compliance, you must meet the requirements of paragraphs
(d)(5)(i) through (iii) of this section.
    (i) You must conduct an initial performance test according to the
requirements in Sec.  63.11945 to demonstrate compliance with the total
organic HAP, vinyl chloride, hydrogen chloride, or dioxin/furan
emission limit in Table 1 or 2 to this subpart.
    (ii) During the performance test specified in paragraph (d)(5)(i)
of this section, for each CPMS installed and operated as specified in
paragraph (d)(2) of this section, you must establish an operating limit
as the operating parameter range, minimum operating parameter level, or
maximum operating parameter level specified in Sec.  63.11935(d). Each
operating limit must be based on the data averaging period for
compliance specified in Table 6 to this subpart using data collected at
the minimum frequency specified in Sec. Sec.  63.11935(c)(2) and
63.11890(c), and calculated using the data reduction method specified
in Sec.  63.11935(e). For a CPMS used on a batch operation, you may use
a data averaging period based on an operating block in lieu of the
averaging period specified in Table 6 to this subpart.
    (e) Continuous compliance. To demonstrate continuous compliance
with the emission limits in Table 1 or 2 to this subpart for each
process vent, you must comply with paragraphs (e)(1) through (5) of
this section.
    (1) You must meet the requirements in Sec.  63.11930 for each
closed vent system.
    (2) You must operate and maintain each CEMS and CPMS required in
paragraph (c) of this section as specified in Sec.  63.11935(b) and
(c), respectively.
    (3) For each emission limit for which you use a CEMS to demonstrate
compliance, you must meet the requirements in paragraphs (e)(3)(i) and
(ii) of this section.
    (i) You must conduct a periodic site-specific CEMS performance
evaluation test according to your quality control program and site-
specific performance evaluation test plan specified in Sec.
63.11935(b)(1).
    (ii) You must demonstrate continuous compliance with the emission
limits in Table 1 or 2 to this subpart based on 3-hour block averages
of CEMS data, the minimum data collection frequency specified in
Sec. Sec.  63.11935(b)(2) and 63.11890(c), and the data reduction
method specified in Sec.  63.11935(e). For a CEMS used on a batch
operation, you may use a data averaging period based on an operating
block in lieu of the 3-hour averaging period.
    (4) For each emission limit for which you do not use a CEMS to
demonstrate compliance, you must meet the requirements of paragraphs
(e)(4)(i) and (ii) of this section.
    (i) Except for hydrogen chloride, you must conduct an annual
performance test according to the requirements in Sec.  63.11945 for
each pollutant in Table 1 or 2 to this subpart.
    (ii) For each CPMS operated and maintained as specified in
paragraph (e)(2) of this section, you must meet the requirements
specified in paragraphs (e)(4)(ii)(A) through (C) of this section.
    (A) You must conduct periodic site-specific CPMS performance
evaluation tests according to your site-specific monitoring plan and
Sec.  63.11935(c).
    (B) For each control device being monitored, you must continuously
collect CPMS data consistent with Sec.  63.11890(c) and your site-
specific monitoring plan. You must continuously determine the average
value of each monitored operating parameter based on the data
collection and reduction methods specified in Sec. Sec.  63.11935(c)(2)
and 63.11935(e), and the applicable data averaging period for
compliance specified in Table 6 to this subpart for all periods the
process is operating. For a CPMS used on a batch operation, you may use
a data averaging period based on an operating block in lieu of the
averaging periods specified in Table 6 to this subpart.
    (C) You must demonstrate continuous compliance with each operating
limit established in paragraph (d)(4)(iii) of this section using these
average values calculated in paragraph (e)(4)(ii)(B) of this
section.(5) Each closed vent systems and control device used to comply
with an emission limit in Table 1 or 2 to this subpart must be operated
at all times when emissions are vented to, or collected by, these
systems or devices.
    (f) To demonstrate compliance with the dioxin/furan toxic
equivalency emission limit specified in Table 1 or 2 to this subpart,
you must determine dioxin/furan toxic equivalency as specified in
paragraphs (f)(1) through (3) of this section.
    (1) Measure the concentration of each dioxin/furan tetra-through
octachlorinated-congener emitted using Method 23 at 40 CFR part 60,
appendix A-7.
    (2) For each dioxin/furan (tetra-through octachlorinated) congener
measured in accordance with paragraph (f)(1) of this section, multiply
the congener concentration by its corresponding toxic equivalency
factor specified in Table 7 to this subpart.
    (3) Sum the products calculated in accordance with paragraph (f)(2)
of this section to obtain the total concentration of dioxins/furans
emitted in terms of toxic equivalency.

Sec.  63.11930  What requirements must I meet for closed vent systems?

    (a) General. To route emissions from process vents subject to the
HAP emission limits in Table 1 or 2 to this subpart to a control
device, you must use a closed vent system and meet the requirements of
this section and all provisions referenced in this section. However, if
you operate and maintain your closed vent system in vacuum service as
defined in Sec.  63.12005, you must meet the requirements in paragraph
(h) of this section and are not required to meet the requirements in
paragraphs (a) through (g) of this section.
    (b) Collection of emissions. Each closed vent system must be
designed and operated to collect the HAP vapors from the process vent,
and to route the collected vapors to a control device.
    (c) Bypass. For each closed vent system that contains a bypass as
defined in Sec.  63.12005 (e.g., diverting a vent stream away from the
control device or causing air intrusion into the control device), you
must not discharge to the atmosphere through the bypass. Any such
release constitutes a violation of this rule. The use of any bypass
diverted to the atmosphere during a performance test invalidates the
performance test. You must comply with the provisions of either
paragraph (c)(1) or (2) of this section for each closed vent system
that contains a bypass that could divert a vent stream to the
atmosphere.
    (1) Bypass flow indicator. Install, maintain, and operate a flow
indicator as specified in paragraphs (c)(1)(i) through (iv) of this
section.
    (i) The flow indicator must be properly installed at the entrance
to any bypass.
    (ii) The flow indicator must be equipped with an alarm system that
will alert an operator immediately, and automatically when flow is
detected in the bypass. The alarm must be located such that the alert
is detected and recognized easily by an operator.
    (iii) If the alarm is triggered, you must immediately initiate
procedures to identify the cause of the alarm. If any closed vent
system has discharged to the

atmosphere through a vent or bypass, you must initiate procedures to
stop the bypass discharge.
    (iv) For any instances where the flow indicator alarm is triggered,
you must submit to the Administrator within 10 days of the discharge
the report specified in Sec.  63.11985(c)(8). This report is required
even if you elect to follow the procedures specified in Sec.  63.11895
to establish an affirmative defense and submit the reports specified in
Sec.  63.11985(c)(4).
    (2) Bypass valve configuration. Secure the bypass valve in the non-
diverting position with a car-seal or a lock-and-key type
configuration.
    (i) You must visually inspect the seal or closure mechanism at
least once every month to verify that the valve is maintained in the
non-diverting position, and the vent stream is not diverted through the
bypass. A broken seal or closure mechanism or a diverted valve
constitutes a violation from the emission limits in Table 1 or 2 to
this subpart. You must maintain the records specified in paragraph
(g)(1)(ii) of this section.
    (ii) For each seal or closure mechanism, you must comply with
either paragraph (c)(2)(ii)(A) or (B) of this section.
    (A) For each instance that you change the bypass valve to the
diverting position, you must submit to the Administrator within 10 days
of the action the report specified in Sec.  63.11985(c)(8). This report
is required even if you elect to follow the procedures specified in
Sec.  63.11895 to establish an affirmative defense and submit the
reports specified in Sec.  63.11985(c)(4).
    (B) You must install, maintain, and operate a bypass flow indicator
as specified in paragraphs (c)(1)(i) and (ii) of this section and you
must meet the requirements in paragraph (c)(1)(iii) and (iv) of this
section for each instance that the flow indicator alarm is triggered.
    (d) Closed vent system inspection and monitoring requirements.
Except as provided in paragraph (d)(3) of this section, you must
inspect each closed vent system as specified in paragraph (d)(1) or (2)
of this section.
    (1) Hard-piping inspection. If the closed vent system is
constructed of hard-piping, you must comply with the requirements
specified in paragraphs (d)(1)(i) and (ii) of this section.
    (i) Conduct an initial inspection according to the procedures in
paragraph (e) of this section.
    (ii) Conduct annual inspections for visible, audible, or olfactory
indications of leaks.
    (2) Ductwork inspection. If the closed vent system is constructed
of ductwork, you must conduct initial and annual inspections according
to the procedures in paragraph (e) of this section.
    (3) Equipment that is unsafe to inspect. You may designate any
parts of the closed vent system as unsafe to inspect if you determine
that personnel would be exposed to an immediate danger as a consequence
of complying with the initial and annual closed vent system inspection
requirements of this subpart.
    (e) Closed vent system inspection procedures. Except as provided in
paragraph (e)(4) of this section, you must comply with all provisions
of paragraphs (e)(1) through (e)(3) of this section.
    (1) General. Inspections must be performed during periods when HAP
is being collected by or vented through the closed vent system. A leak
is indicated by an instrument reading greater than 500 parts per
million by volume above background or by visual inspection.
    (2) Inspection procedures. Each closed vent system subject to this
paragraph (e)(2) must be inspected according to the procedures
specified in paragraphs (e)(2)(i) through (vii) of this section.
    (i) Inspections must be conducted in accordance with Method 21 at
40 CFR part 60, appendix A-7, except as otherwise specified in this
section.
    (ii) Except as provided in paragraph (e)(2)(iii) of this section,
the detection instrument must meet the performance criteria of Method
21 at 40 CFR part 60, appendix A-7, except the instrument response
factor criteria in section <IP_ADDRESS> of Method 21 must be for the
representative composition of the process fluid and not of each
individual volatile organic compound in the stream. For process streams
that contain nitrogen, air, water, or other inerts that are not organic
HAP or volatile organic compound, the representative stream response
factor must be determined on an inert-free basis. You may determine the
response factor at any concentration for which you will monitor for
leaks.
    (iii) If no instrument is available at the plant site that will
meet the performance criteria of Method 21 at 40 CFR part 60, appendix
A-7 specified in paragraph (e)(2)(ii) of this section, the instrument
readings may be adjusted by multiplying by the representative response
factor of the process fluid, calculated on an inert-free basis as
described in paragraph (e)(2)(ii) of this section.
    (iv) The detection instrument must be calibrated before use on each
day of its use by the procedures specified in Method 21 at 40 CFR part
60, appendix A-7.
    (v) Calibration gases must be as specified in paragraphs
(e)(2)(v)(A) through (D) of this section.
    (A) Zero air (less than 10 parts per million by volume hydrocarbon
in air).
    (B) Mixtures of methane in air at a concentration less than 10,000
parts per million by volume. A calibration gas other than methane in
air may be used if the instrument does not respond to methane or if the
instrument does not meet the performance criteria specified in
paragraph (e)(2)(ii) of this section. In such cases, the calibration
gas may be a mixture of one or more of the compounds to be measured in
air.
    (C) If the detection instrument's design allows for multiple
calibration scales, then the lower scale must be calibrated with a
calibration gas that is no higher than 2,500 parts per million by
volume.
    (D) Perform a calibration drift assessment, at a minimum, at the
end of each monitoring day. Check the instrument using the same
calibration gas(es) that were used to calibrate the instrument before
use. Follow the procedures specified in Method 21 at 40 CFR part 60,
appendix A-7, Section 10.1, except do not adjust the meter readout to
correspond to the calibration gas value. Record the instrument reading
for each scale used as specified in paragraph (g)(4) of this section.
Divide these readings by the initial calibration values for each scale
and multiply by 100 to express the calibration drift as a percentage.
If any calibration drift assessment shows a negative drift of more than
10 percent from the initial calibration value, then all equipment
monitored since the last calibration with instrument readings below the
appropriate leak definition and above the leak definition multiplied by
the value specified in paragraph (e)(2)(v)(D)(1) of this section must
be re-monitored. If any calibration drift assessment shows a positive
drift of more than 10 percent from the initial calibration value, then,
at your discretion, all equipment since the last calibration with
instrument readings above the appropriate leak definition and below the
leak definition multiplied by the value specified in paragraph
(e)(2)(v)(D)(2) of this section may be re-monitored.
    (1) 100 minus the percent of negative drift, divided by 100.
    (2) 100 plus the percent of positive drift, divided by 100.
    (vi) You may elect to adjust or not adjust instrument readings for
background. If you elect not to adjust readings for background, all
such

instrument readings must be compared directly to 500 parts per million
by volume to determine whether there is a leak. If you elect to adjust
instrument readings for background, you must measure background
concentration using the procedures in this section. You must subtract
the background reading from the maximum concentration indicated by the
instrument.
    (vii) If you elect to adjust for background, the arithmetic
difference between the maximum concentration indicated by the
instrument and the background level must be compared with 500 parts per
million by volume for determining whether there is a leak.
    (3) Instrument probe. The instrument probe must be traversed around
all potential leak interfaces as described in Method 21 at 40 CFR part
60, appendix A-7.
    (4) Unsafe-to-inspect written plan requirements. For equipment
designated as unsafe to inspect according to the provisions of
paragraph (d)(3) of this section, you must maintain and follow a
written plan that requires inspecting the equipment as frequently as
practical during safe-to-inspect times, but not more frequently than
the annual inspection schedule otherwise applicable. You must still
repair unsafe-to-inspect equipment according to the procedures in
paragraph (f) of this section if a leak is detected.
    (f) Closed vent system leak repair provisions. The provisions of
this paragraph (f) apply to closed vent systems collecting HAP from an
affected source.
    (1) Leak repair general for hard-piping. If there are visible,
audible, or olfactory indications of leaks at the time of the annual
visual inspections required by paragraph (d)(1)(ii) of this section,
you must follow the procedure specified in either paragraph (f)(1)(i)
or (ii) of this section.
    (i) You must eliminate the leak.
    (ii) You must monitor the equipment according to the procedures in
paragraph (e) of this section and comply with the leak repair
provisions in paragraph (f)(2) of this section.
    (2) Leak repair schedule. Leaks must be repaired as soon as
practical, except as provided in paragraph (f)(3) of this section.
    (i) A first attempt at repair must be made no later than 5 days
after the leak is detected.
    (ii) Except as provided in paragraph (f)(3) of this section,
repairs must be completed no later than 15 days after the leak is
detected or at the beginning of the next introduction of vapors to the
system, whichever is later.
    (3) Delay of repair. Delay of repair of a closed vent system for
which leaks have been detected is allowed if repair within 15 days
after a leak is detected is technically infeasible or unsafe without a
closed vent system shutdown, as defined in Sec.  63.12005, or if you
determine that emissions resulting from immediate repair would be
greater than the emissions likely to result from delay of repair.
Repair of such equipment must be completed as soon as practical, but
not later than the end of the next closed vent system shutdown.
    (g) Closed vent system records. For closed vent systems, you must
record the information specified in paragraphs (g)(1) through (5) of
this section, as applicable.
    (1) Bypass records. For each closed vent system that contains a
bypass that could divert a vent stream away from the control device and
to the atmosphere, or cause air intrusion into the control device, you
must keep a record of the information specified in either paragraph
(g)(1)(i) or (ii) of this section, as applicable.
    (i) You must maintain records of any alarms triggered because flow
was detected in the bypass, including the date and time the alarm was
triggered, the duration of the flow in the bypass, as well as records
of the times of all periods when the vent stream is diverted from the
control device or the flow indicator is not operating.
    (ii) Where a seal mechanism is used to comply with paragraph (c)(2)
of this section, hourly records of flow are not required. In such
cases, you must record that the monthly visual inspection of the seals
or closure mechanisms has been done, and must record the occurrence of
all periods when the seal mechanism is broken, the bypass valve
position has changed, or the key for a lock-and-key type lock has been
checked out, and records of any car-seal that has been broken.
    (2) Inspection records. For each instrumental or visual inspection
conducted in accordance with paragraph (d)(1) or (2) of this section
for closed vent systems collecting HAP from an affected source during
which no leaks are detected, you must record that the inspection was
performed, the date of the inspection, and a statement that no leaks
were detected.
    (3) Leak records. When a leak is detected from a closed vent system
collecting HAP from an affected source, the information specified in
paragraphs (g)(3)(i) through (vi) of this section must be recorded and
kept for 5 years.
    (i) The instrument and the equipment identification number and the
operator name, initials, or identification number.
    (ii) The date the leak was detected and the date of the first
attempt to repair the leak.
    (iii) The date of successful repair of the leak.
    (iv) The maximum instrument reading measured by the procedures in
paragraph (e) of this section after the leak is successfully repaired.
    (v) Repair delayed and the reason for the delay if a leak is not
repaired within 15 days after discovery of the leak. You may develop a
written procedure that identifies the conditions that justify a delay
of repair. In such cases, reasons for delay of repair may be documented
by citing the relevant sections of the written procedure.
    (vi) Copies of the compliance reports as specified in Sec.
63.11985(b)(9), if records are not maintained on a computerized
database capable of generating summary reports from the records.
    (4) Instrument calibration records. You must maintain records of
the information specified in paragraphs (g)(4)(i) through (vi) of this
section for monitoring instrument calibrations conducted according to
sections 8.1.2 and 10 of Method 21 at 40 CFR part 60, appendix A-7, and
paragraph (e) of this section.
    (i) Date of calibration and initials of operator performing the
calibration.
    (ii) Calibration gas cylinder identification, certification date,
and certified concentration.
    (iii) Instrument scale(s) used.
    (iv) A description of any corrective action taken if the meter
readout could not be adjusted to correspond to the calibration gas
value in accordance with section 10.1 of Method 21 at 40 CFR part 60,
appendix A-7.
    (v) Results of each calibration drift assessment required by
paragraph (e)(2)(v)(D) of this section (i.e., instrument reading for
calibration at end of the monitoring day and the calculated percent
difference from the initial calibration value).
    (vi) If you make your own calibration gas, a description of the
procedure used.
    (5) Unsafe-to-inspect records. If you designate equipment as
unsafe-to-inspect as specified in paragraph (d)(3) of this section, you
must keep the records specified in paragraph (g)(5)(i) and (ii) of this
section.
    (i) You must maintain the identity of unsafe-to-inspect equipment
as specified in paragraph (d)(3) of this section.
    (ii) You must keep a written plan for inspecting unsafe-to-inspect
equipment as required by paragraph (e)(4) of this section and record
all activities performed according to the written plan.

    (h) Closed vent systems in vacuum service. If you operate and
maintain a closed vent system in vacuum service as defined in Sec.
63.12005, you must comply with the requirements in paragraphs (h)(1)
through (3) of this section, and you are not required to comply with
any other provisions of this section. Any incidence where a closed vent
system designed to be in vacuum service is operating and not in vacuum
service constitutes a violation of this rule, unless the closed vent
system is meeting the requirements in paragraphs (a) through (g) of
this section for closed vent systems that are not in vacuum service.
Any such incidence during a performance test invalidates the
performance test.
    (1) In vacuum service alarm. You must install, maintain, and
operate a pressure gauge and alarm system that will alert an operator
immediately and automatically when the pressure is such that the closed
vent system no longer meets the definition of in vacuum service as
defined in Sec.  63.12005. The alarm must be located such that the
alert is detected and recognized easily by an operator.
    (2) In vacuum service alarm procedures. If the alarm is triggered
for a closed vent system operating in vacuum service as specified in
paragraph (h)(1) of this section, you must immediately initiate
procedures to identify the cause of the alarm. If the closed vent
system is not in vacuum service, you must initiate procedures to get
the closed vent system back in vacuum service as defined in Sec.
63.12005, or you must immediately comply with the requirements in
paragraphs (a) through (g) of this section for closed vent systems that
are not in vacuum service.
    (3) In vacuum service alarm records and reports. For any incidences
where a closed vent system designed to be in vacuum service is not in
vacuum service, you must submit to the Administrator within 10 days of
the incident the report specified in Sec.  63.11985(c)(8). This report
is required even if you elect to follow the procedures specified in
Sec.  63.11895 to establish an affirmative defense and submit the
reports specified in Sec.  63.11985(c)(4).

Sec.  63.11935  What CEMS and CPMS requirements must I meet to
demonstrate initial and continuous compliance with the emission
standards for process vent control devices, resin strippers, and
wastewater treatment processes?

    (a) General requirements for CEMS and CPMS. You must meet the
requirements in paragraph (b) of this section for each CEMS specified
in Sec.  63.11925(c) used to demonstrate compliance with the emission
limits for process vents in Table 1 or 2 to this subpart. You must meet
the CPMS requirements in paragraph (c) of this section and establish
your operating limits in paragraph (d) of this section for each
operating parameter specified in Table 6 to this subpart for each
process vent control device, resin stripper, or wastewater treatment
process specified in paragraphs (a)(1) through (3) of this section.
    (1) For each control device specified in Sec.  63.11925(c) that is
used to comply with the emission limits for process vents in Table 1 or
2 to this subpart, except that flow indicators specified in Sec.
63.11940(e) are not subject to the requirements of this section.
    (2) For each resin stripper specified in Sec.  63.11960(c) and used
to comply with the emission limit for resin in Table 1 or 2 to this
subpart.
    (3) For each wastewater treatment process specified in Sec.
63.11975(a) and used to comply with the emission limit for wastewater
in Table 3 to this subpart.
    (b) CEMS. You must install, operate, and maintain each CEMS
according to paragraphs (b)(1) through (7) of this section and
continuously monitor emissions.
    (1) You must prepare your quality control program and site-specific
performance evaluation test plan, as specified in Sec.  63.8(d) and
(e). You must submit your performance evaluation test plan to the
Administrator for approval, as specified in Sec.  63.8(e)(3).
    (2) The monitoring equipment must be capable of providing a
continuous record, recording data at least once every 15 minutes.
    (3) You must conduct initial and periodic site-specific performance
evaluations and any required tests of each CEMS according to your
quality control program and site-specific performance evaluation test
plan prepared as specified in Sec.  63.8(d) and (e).
    (4) If supplemental gases are added to the control device, you must
correct the measured concentrations in accordance with Sec.
63.11945(d)(1).
    (5) You must operate and maintain the CEMS in continuous operation
according to the quality control program and performance evaluation
test plan. CEMS must record data at least once every 15 minutes.
    (6) CEMS must meet the minimum accuracy and calibration frequency
requirements specified in the performance specifications specified in
paragraphs (b)(6)(i) and (ii) of this section, as applicable.
    (i) A hydrogen chloride or dioxin/furan CEMS must meet the
requirements of the promulgated performance specification for the CEMS.
    (ii) A total hydrocarbon CEMS must meet the requirements of 40 CFR
Part 60, Appendix B, performance specification 8A.
    (7) Before commencing or ceasing use of a CEMS system, you must
notify the Administrator as specified in paragraphs (b)(6)(i) and (ii)
of this section.
    (i) You must notify the Administrator 1 month before starting use
of the continuous emissions monitoring system.
    (ii) You must notify the Administrator 1 month before stopping use
of the continuous emissions monitoring system, in which case you must
also conduct a performance test within 60 days of ceasing operation of
the system.
    (c) CPMS. You must install, maintain, and operate each CPMS as
specified in paragraphs (c)(1) through (6) of this section and
continuously monitor operating parameters.
    (1) As part of your quality control program and site-specific
performance evaluation test plan prepared as specified in Sec.  63.8(d)
and (e), you must prepare a site-specific monitoring plan that
addresses the monitoring system design, data collection, and the
quality assurance and quality control elements specified in paragraphs
(c)(1)(i) through (v) of this section and Sec.  63.8(d). You are not
required to submit the plan for approval unless requested by the
Administrator. You may request approval of monitoring system quality
assurance and quality control procedure alternatives to those specified
in paragraphs (c)(1)(i) through (v) of this section in your site-
specific monitoring plan.
    (i) The performance criteria and design specifications for the
monitoring system equipment, including the sample interface, detector
signal analyzer, and data acquisition and calculations.
    (ii) Sampling interface (e.g., thermocouple) location such that the
monitoring system will provide representative measurements.
    (iii) Equipment performance checks, calibrations, or other audit
procedures.
    (iv) Ongoing operation and maintenance procedures in accordance
with provisions in Sec.  63.8(c)(1) and (3).
    (v) Ongoing reporting and recordkeeping procedures in accordance
with provisions in Sec.  63.10(c), (e)(1), and (e)(2)(i).
    (2) The monitoring equipment must be capable of providing a
continuous

record, recording data at least once every 15 minutes.
    (3) You must install, operate, and maintain each CPMS required in
this paragraph (c) according to the procedures and requirements in your
site-specific monitoring plan.
    (4) You must conduct an initial and periodic site-specific
performance evaluation tests of each CPMS according to your site-
specific monitoring plan.
    (5) All CPMS must meet the specific parameter (e.g., minimum
accuracy and calibration frequency) requirements specified in Sec.
63.11940 and Table 8 to this subpart.
    (6) Monitoring equipment for temperature, pressure, volumetric flow
rate, mass flow rate, and conductivity must be capable of measuring the
appropriate parameter over a range that extends at least 20 percent
beyond the normal expected operating range of values for that
parameter. The data recording system associated with affected CPMS must
have a resolution that is equal to or better than one-half of the
required system accuracy.
    (d) Establish operating limit. For each operating parameter that
must be monitored in Sec.  63.11925(c) for process vent control
devices, in Sec.  63.11960(c) for resin strippers, and in Sec.
63.11975(a) for wastewater treatment processes, you must establish an
operating limit as specified in paragraphs (d)(1) through (6) of this
section. You must establish each operating limit as an operating
parameter range, minimum operating parameter level, or maximum
operating parameter level as specified in Table 6 to this subpart.
Where this subpart does not specify which format to use for your
operating limit (e.g., operating range or minimum operating level), you
must determine which format is best to establish proper operation of
the control device, resin stripper, or treatment process such that you
are meeting the emission limits specified in Table 1, 2, or 3 to this
subpart.
    (1) For process vent control devices, the operating limit
established for each monitored parameter specified in Sec.  63.11940
must be based on the operating parameter values recorded during any
performance test conducted to demonstrate compliance in Sec.
63.11925(d)(4) and (e)(4) and may be supplemented by engineering
assessments and/or manufacturer's recommendations. You are not required
to conduct performance tests over the entire range of allowed operating
parameter values. The established operating limit must represent the
conditions for which the control device is meeting the emission limits
specified in Table 1 or 2 to this subpart.
    (2) For resin strippers, the operating limit established for each
monitoring parameter specified in Sec.  63.11960(c) must be based on
the operating parameter values recorded during any resin sampling event
specified in Sec.  63.11960(b)(2) or (4) or Sec.  63.11960(c)(3) or
(5). You may use engineering assessments and/or manufacturer's
recommendations to supplement the initial performance test results when
establishing the operating limit. The established operating limit must
represent the conditions for which the resin stripper is meeting the
emission limits specified in Table 1 or 2 to this subpart.
    (3) For wastewater treatment processes treating a wastewater stream
to achieve the vinyl chloride concentration specified in Table 3 to
this subpart, the operating limit established for each monitored
parameter specified in Sec.  63.11975(a)(1) must be based on the
operating parameter level recorded during any sampling event specified
in Sec.  63.11970(a)(1)(ii) or (iii) or Sec.  63.11975(a)(3). You may
use engineering assessments and/or manufacturer's recommendations to
supplement the initial testing results when establishing the operating
limit. The established operating limit must represent the conditions
for which the treatment process is meeting the requirements specified
in Table 3 to this subpart.
    (4) You must include as part of the notification of compliance
status or the operating permit application or amendment, the
information in paragraphs (d)(4)(i) through (iv) of this section, as
applicable, for each process vent control device, resin stripper, and
wastewater treatment process requiring operating limits.
    (i) Descriptions of monitoring devices and monitoring frequencies
for each emission point and operating scenario.
    (ii) The established operating limit of the monitored parameter(s).
    (iii) The rationale for the established operating limit, including
any data and calculations used to develop the operating limit and a
description of why the operating limit indicates proper operation of
the control device, resin stripper, or wastewater treatment process.
    (iv) The rationale used to determine which format to use for your
operating limit (e.g., operating range, minimum operating level, or
maximum operating level), where this subpart does not specify which
format to use.
    (5) For batch processes, you may establish operating limits for
individual batch emission episodes, including each distinct episode of
process vent emissions or each individual type of batch process that
generates wastewater, if applicable. You must provide rationale in a
batch precompliance report as specified in Sec.  63.11985(c)(2) instead
of the notification of compliance status for the established operating
limit. You must include any data and calculations used to develop the
operating limits and a description of why each operating limit
indicates proper operation of the control device during the specific
batch emission episode, or of the wastewater treatment process or resin
stripper during the individual batch operation generating wastewater or
stripped resin.
    (6) If you elect to establish separate operating limits for
different batch emission episodes within a batch process as specified
in paragraph (d)(5) of this section, you must maintain daily records
indicating each point at which you change from one operating limit to
another, even if the monitoring duration for an operating limit is less
than 15 minutes. You must maintain a daily record according to Sec.
63.11990(e)(4)(i).
    (e) Reduction of CPMS and CEMS data. You must reduce CEMS and CPMS
data to 1-hour averages according to Sec.  63.8(g) to compute the
average values for demonstrating compliance specified in Sec. Sec.
63.11925(e)(3)(ii), 63.11925(e)(4)(ii)(B), 63.11960(c)(2), and
63.11975(a)(2) for CEMS and CPMS, as applicable.

Sec.  63.11940  What continuous monitoring requirements must I meet for
control devices required to install CPMS to meet the emission limits
for process vents?

    As required in Sec.  63.11925(c), you must install and operate the
applicable CPMS specified in paragraphs (a) through (i) of this section
for each control device you use to comply with the emission limits for
process vents in Table 1 or 2 to this subpart. You must monitor,
record, and calculate CPMS data averages as specified in Table 6 to
this subpart. Paragraph (j) of this section provides an option to
propose alternative monitoring parameters or procedures.
    (a) Flow indicator. If flow to a control device could be
intermittent, you must install, calibrate, and operate a flow indicator
at the inlet or outlet of the control device to identify periods of no
flow.
    (b) Incinerator monitoring. If you are using an incinerator to meet
an emission limit in Table 1 or 2 to this subpart and you are required
to use CPMS as specified in Sec.  63.11925(c), you must equip the
incinerator with the monitoring equipment specified in

paragraphs (b)(1) through (3) of this section, as applicable.
    (1) If an incinerator other than a catalytic incinerator is used,
you must install a temperature monitoring device in the fire box or in
the ductwork immediately downstream of the fire box in a position
before any substantial heat exchange occurs.
    (2) Except as provided in paragraph (b)(3) of this section, where a
catalytic incinerator is used, you must install temperature monitoring
devices in the gas stream immediately before and after the catalyst
bed. You must monitor the temperature differential across the catalyst
bed.
    (3) Instead of complying with paragraph (b)(2) of this section, and
if the temperature differential between the inlet and outlet of the
catalytic incinerator during normal operating conditions is less than
10 degrees Celsius (18 degrees Fahrenheit), you may elect to monitor
the inlet temperature and conduct catalyst checks as specified in
paragraphs (b)(3)(i) and (ii) of this section.
    (i) You must conduct annual sampling and analysis of the catalyst
activity (i.e., conversion efficiency) following the manufacturer's or
catalyst supplier's recommended procedures. If problems are found
during the catalyst activity test, you must replace the catalyst bed or
take other corrective action consistent with the manufacturer's
recommendations within 15 days or by the next time any process vent
stream is collected by the control device, whichever is sooner.
    (ii) You must conduct annual internal inspections of the catalyst
bed to check for fouling, plugging, or mechanical breakdown. You must
also inspect the bed for channeling, abrasion, and settling. If
problems are found during the annual internal inspection of the
catalyst, you must replace the catalyst bed or take other corrective
action consistent with the manufacturer's recommendations within 15
days or by the next time any process vent stream is collected by the
control device, whichever is later. If the catalyst bed is replaced and
is not of like or better kind and quality as the old catalyst then you
must conduct a new performance test according to Sec.  63.11945 to
determine destruction efficiency. If a catalyst bed is replaced and the
replacement catalyst is of like or better kind and quality as the old
catalyst, then a new performance test to determine destruction
efficiency is not required.
    (c) Absorber and acid gas scrubber monitoring. If you are using an
absorber or acid gas scrubber to meet an emission limit in Table 1 or 2
to this subpart and you are required to use CPMS as specified in Sec.
63.11925(c), you must install the monitoring equipment specified in
paragraphs (c)(1) through (3) of this section.
    (1) Install and operate the monitoring equipment as specified in
either paragraph (c)(1)(i) or (ii) of this section.
    (i) A flow meter to monitor the absorber or acid gas scrubber
influent liquid flow.
    (ii) A flow meter to monitor the absorber or acid gas scrubber
influent liquid flow and the gas stream flow using one of the
procedures specified in paragraphs (c)(1)(ii)(A), (B), or (C) of this
section. You must monitor the liquid-to-gas ratio determined by
dividing the flow rate of the absorber or acid gas scrubber influent by
the gas flow rate. The units of measure must be consistent with those
used to calculate this ratio during the performance test.
    (A) Determine gas stream flow using the design blower capacity,
with appropriate adjustments for pressure drop.
    (B) Measure the gas stream flow at the absorber or acid gas
scrubber inlet.
    (C) If you have previously determined compliance for a scrubber
that requires a determination of the liquid-to-gas ratio, you may use
the results of that test provided the test conditions are
representative of current operation.
    (2) Install and operate the monitoring equipment as specified in
either paragraph (c)(2)(i), (ii), or (iii) of this section.
    (i) Install and operate pressure gauges at the inlet and outlet of
the absorber or acid gas scrubber to monitor the pressure drop through
the absorber or acid gas scrubber.
    (ii) If the difference in the inlet gas stream temperature and the
inlet liquid stream temperature is greater than 38 degrees Celsius, you
may install and operate a temperature monitoring device at the scrubber
gas stream exit.
    (iii) If the difference between the specific gravity of the
scrubber effluent scrubbing fluid and specific gravity of the scrubber
inlet scrubbing fluid is greater than or equal to 0.02 specific gravity
units, you may install and operate a specific gravity monitoring device
on the inlet and outlet of the scrubber.
    (3) If the scrubbing liquid is a reactant (e.g., lime, ammonia
hydroxide), you must install and operate one of the devices listed in
either paragraph (c)(3)(i), (ii), or (iii) of this section.
    (i) A pH monitoring device to monitor the pH of the scrubber liquid
effluent.
    (ii) A caustic strength monitoring device to monitor the caustic
strength of the scrubber liquid effluent.
    (iii) A conductivity monitoring device to monitor the conductivity
of the scrubber liquid effluent.
    (d) Regenerative adsorber monitoring. If you are using a
regenerative adsorber to meet an emission limit in Table 1 or 2 to this
subpart and you are required to use CPMS as specified in Sec.
63.11925(c), you must install and operate the applicable monitoring
equipment listed in paragraphs (d)(1) through (5) of this section, and
comply with the requirements in paragraphs (d)(6) and (7) of this
section. If the adsorption system water is deemed as wastewater or
process vents as specified in Sec.  63.11935, it is subject to the
requirements in this subpart.
    (1) For non-vacuum regeneration systems, an integrating
regeneration stream flow monitoring device having an accuracy of 10 percent, capable of recording the total regeneration stream
mass for each regeneration cycle. For non-vacuum regeneration systems,
an integrating regeneration stream flow monitoring device capable of
continuously recording the total regeneration stream mass flow for each
regeneration cycle.
    (2) For non-vacuum regeneration systems, an adsorber bed
temperature monitoring device, capable of continuously recording the
adsorber bed temperature after each regeneration and within 15 minutes
of completing any temperature regulation (cooling or warming to bring
bed temperature closer to vent gas temperature) portion of the
regeneration cycle.
    (3) For non-vacuum and non-steam regeneration systems, an adsorber
bed temperature monitoring device capable of continuously recording the
bed temperature during regeneration, except during any temperature
regulating (cooling or warming to bring bed temperature closer to vent
gas temperature) portion of the regeneration cycle.
    (4) For a vacuum regeneration system, a pressure transmitter
installed in the vacuum pump suction line capable of continuously
recording the vacuum level for each minute during regeneration. You
must establish a minimum target and a length of time at which the
vacuum must be below the minimum target during regeneration.
    (5) A device capable of monitoring the regeneration frequency
(i.e., operating time since last regeneration) and duration.
    (6) You must perform a verification of the adsorber during each day
of operation. The verification must be through visual observation or
through an automated alarm or shutdown system that monitors and records
system

operational parameters. The verification must verify that the adsorber
is operating with proper valve sequencing and cycle time.
    (7) You must conduct weekly measurements of the carbon bed outlet
volatile organic compounds concentration, as specified in this
paragraph (d)(7), over the last 5 minutes of an adsorption cycle for
each carbon bed. For regeneration cycles longer than 1 week, you must
perform the measurement over the last 5 minutes of each adsorption
cycle for each carbon bed. The outlet concentration of volatile organic
compounds must be measured using a portable analyzer, in accordance
with Method 21 at 40 CFR part 60, appendix A-7, for open-ended lines.
Alternatively, outlet concentration of HAP(s) may be measured using
chromatographic analysis using Method 18 at 40 CFR part 60, appendix A-
6.
    (e) Non-regenerative adsorber monitoring. If you are using a non-
regenerative adsorber, or canister type system that is sent off site
for regeneration or disposal, to meet an emission limit in Table 1 or 2
to this subpart and you are required to use CPMS as specified in Sec.
63.11925(c), you must install a system of dual adsorber units in series
and conduct the monitoring and bed replacement as specified in
paragraphs (e)(1) through (4) of this section.
    (1) Establish the average adsorber bed life by conducting daily
monitoring of the outlet volatile organic compound or HAP
concentration, as specified in this paragraph (e)(1), of the first
adsorber bed in series until breakthrough occurs for the first three
adsorber bed change-outs. The outlet concentration of volatile organic
compounds must be measured using a portable analyzer, in accordance
with Method 21 at 40 CFR part 60, Appendix A-7, for open-ended lines.
Alternatively, outlet concentration of HAP may be measured using
chromatographic analysis using Method 18 at 40 CFR part 60, Appendix A-
6. Breakthrough of the bed is defined as the time when the level of HAP
detected is at the highest concentration allowed to be discharged from
the adsorber system.
    (2) Once the average life of the bed is determined, conduct ongoing
monitoring as specified in paragraphs (e)(2)(i) through (iii) of this
section.
    (i) Except as provided in paragraphs (e)(2)(ii) and (iii) of this
section, conduct daily monitoring of the adsorber bed outlet volatile
organic compound or HAP concentration, as specified in paragraph (e)(1)
of this section.
    (ii) You may conduct monthly monitoring if the adsorbent has more
than 2 months of life remaining, as determined by the average primary
adsorber bed life, established in paragraph (e)(1) of this section, and
the date the adsorbent was last replaced.
    (iii) You may conduct weekly monitoring if the adsorbent has more
than 2 weeks of life remaining, as determined by the average primary
adsorber bed life, established in paragraph (e)(1) of this section, and
the date the adsorbent was last replaced.
    (3) The first adsorber in series must be replaced immediately when
breakthrough is detected between the first and second adsorber. The
original second adsorber (or a fresh canister) will become the new
first adsorber and a fresh adsorber will become the second adsorber.
For purposes of this paragraph (e)(3), ``immediately'' means within 8
hours of the detection of a breakthrough for adsorbers of 55 gallons or
less, and within 24 hours of the detection of a breakthrough for
adsorbers greater than 55 gallons.
    (4) In lieu of replacing the first adsorber immediately, you may
elect to monitor the outlet of the second canister beginning on the day
the breakthrough between the first and second canister is identified
and each day thereafter. This daily monitoring must continue until the
first canister is replaced. If the constituent being monitored is
detected at the outlet of the second canister during this period of
daily monitoring, both canisters must be replaced within 8 hours of the
time of detection of volatile organic compounds or HAP at 90 percent of
the allowed level (90 percent of breakthrough definition).
    (f) Condenser monitoring. If you are using a condenser to meet an
emission limit in Table 1 or 2 to this subpart and you are required to
use CPMS as specified in Sec.  63.11925(c), you must install and
operate a condenser exit gas temperature monitoring device.
    (g) Sorbent injection monitoring. If you are using sorbent
injection as an emission control technique to comply with an emission
limit in Table 1 or 2 to this subpart and you are required to use CPMS
as specified in Sec.  63.11925(c), you must equip sorbent injection
systems with the monitoring equipment specified in paragraphs (g)(1)
through (3) of this section, as applicable. You must also meet the
requirements in paragraph (h) of this section for the fabric filters
used for sorbent collection.
    (1) A flow meter to monitor the rate of sorbent injection.
    (2) A flow meter to monitor the sorbent injection system carrier
gas flow rate.
    (3) You must install and operate a temperature monitoring device to
monitor the temperature in the ductwork immediately downstream of the
fire box of the combustion device. Also, if you are using a particulate
matter control device upstream of the adsorbent injection system, you
must install and operate a temperature monitoring device to monitor the
temperature in the ductwork immediately downstream of the particulate
matter control device.
    (h) Fabric filter monitoring. If you are using a fabric filter to
meet an emission limit in Table 1 or 2 to this subpart and you are
required to use CPMS as specified in Sec.  63.11925(c), you must equip
the fabric filter with a bag leak detection system that meets the
requirements in paragraphs (h)(1) through (11) of this section. You
must conduct the performance evaluation specified in paragraph (h)(12)
of this section.
    (1) Each bag leak detection system must be installed, operated,
calibrated, and maintained in a manner consistent with the
manufacturer's written specifications and recommendations and in
accordance with the guidance provided in Fabric Filter Bag Leak
Detection Guidance, EPA-454/R-98-015, September 1997 (incorporated by
reference, see Sec.  63.14) such that the alarm does not sound more
than 5 percent of the operating time during a 6-month period. You must
calculate the alarm time as specified in paragraphs (h)(1)(i) through
(iv).
    (i) If inspection of the fabric filter demonstrates that no
corrective action is required, no alarm time is counted.
    (ii) If corrective action is required, each alarm time shall be
counted as a minimum of 1 hour.
    (iii) If you take longer than 1 hour to initiate corrective action,
each alarm time (i.e., time that the alarm sounds) is counted as the
actual amount of time taken by you to initiate corrective action.
    (iv) Your maximum alarm time is equal to 5 percent of the operating
time during a 6-month period.
    (2) The bag leak detection system must be certified by the
manufacturer to be capable of detecting particulate matter emissions at
concentrations of 10 milligrams per actual cubic meter or less.
    (3) The bag leak detection system sensor must provide output of
relative or absolute particulate matter loadings.
    (4) The bag leak detection system must be equipped with a device to
continuously record the output signal from the sensor.
    (5) The bag leak detection system must be equipped with an alarm
system that will alert an operator automatically

when an increase in particulate matter emissions over a preset level is
detected. The alarm must be located such that the alert is detected and
recognized easily by an operator.
    (6) For positive pressure fabric filter systems that do not duct
all compartments of cells to a common stack, a bag leak detection
system must be installed in each fabric filter compartment or cell. If
a negative pressure or induced air filter is used, the bag leak
detector must be installed downstream of the fabric filter. If multiple
bag leak detectors are required, the system's instrumentation and alarm
may be shared among detectors.
    (7) Calibration of the bag leak detection system must, at a
minimum, consist of establishing the relative baseline output level by
adjusting the range and the averaging period of the device and
establishing the alarm set points and the alarm delay time.
    (8) Following initial adjustment, you must not adjust the
sensitivity or range, averaging period, alarm set points, or alarm
delay time, except as established in an operation and maintenance plan
required in paragraph (h)(10) of this section that is to be submitted
with the notification of compliance status report. In no event may the
sensitivity be increased more than 100 percent or decreased by more
than 50 percent over a 365-day period unless such adjustment follows a
complete baghouse inspection that demonstrates the baghouse is in good
operating condition.
    (9) If the alert on a bag leak detection system is triggered, you
must, within 1 hour of an alarm, initiate the procedures to identify
the cause of the alarm and take corrective action as specified in the
corrective action plan required in paragraph (h)(11) of this section.
    (10) You must maintain an operation and maintenance plan describing
the items in paragraphs (h)(10)(i) through (v) of this section.
    (i) Installation of the bag leak detection system.
    (ii) Initial and periodic adjustment of the bag leak detection
system, including how the alarm set-point will be established.
    (iii) Operation of the bag leak detection system, including quality
assurance procedures.
    (iv) How the bag leak detection system will be maintained,
including a routine maintenance schedule and spare parts inventory
list.
    (v) How the bag leak detection system output will be recorded and
stored.
    (11) You must maintain a corrective action plan describing
corrective actions to be taken, and the timing of those actions when
the particulate matter concentration exceeds the setpoint and activates
the alarm. Corrective actions may include, but are not limited to the
actions listed in paragraphs (h)(11)(i) through (vi) of this section.
    (i) Inspecting the fabric filter for air leaks, torn or broken bags
or filter media, or any other conditions that may cause an increase in
particulate matter emissions.
    (ii) Sealing off defective bags or filter media.
    (iii) Replacing defective bags or filter media or otherwise
repairing the control device.
    (iv) Sealing off a defective fabric filter compartment.
    (v) Cleaning the bag leak detection system probe or otherwise
repairing the bag leak detection system.
    (vi) Shutting down the control device producing the particulate
matter emissions.
    (12) You must conduct an initial performance evaluation of each
continuous monitoring system and bag leak detection system, as
applicable, in accordance with your quality control program site-
specific performance evaluation test plan (or site-specific monitoring
plan specified in Sec.  63.11935(c) for CPMS), according to Sec.
63.8(d). For the purposes of this subpart, the provisions of Sec.
63.8(d), also apply to the bag leak detection system.
    (i) Other control devices. If you use a control device other than
those listed in this subpart to comply with an emission limit in Table
1 or 2 to this subpart and you are required to use CPMS as specified in
Sec.  63.11925(c), you must comply with the requirements as specified
in paragraphs (i)(1) and (2) of this section.
    (1) Submit a description of the planned monitoring, recordkeeping
and reporting procedures as required in Sec.  63.11985(b)(5)(iv). The
Administrator will approve, deny, or modify the proposed monitoring,
reporting and recordkeeping requirements as part of the review of the
plan or through the review of the permit application or by other
appropriate means.
    (2) You must establish operating limits for monitored parameters
that are approved by the Administrator. To establish the operating
limit, the information required in Sec.  63.11935(d) must be submitted
in the notification of compliance status report specified in Sec.
63.11985(a).
    (j) Alternatives to monitoring requirements.
    (1) You may request approval to use alternatives to the continuous
operating parameter monitoring listed in this section, as specified in
Sec.  63.11985(c)(5).
    (2) You may request approval to monitor a different parameter than
those established in Sec.  63.11935(d) or to set unique monitoring
parameters, as specified in Sec.  63.11985(c)(6). Until permission to
use an alternative monitoring procedure, method, or parameter has been
granted by the Administrator, you remain subject to the requirements of
this subpart.

Sec.  63.11945  What performance testing requirements must I meet for
process vents?

    (a) General. For each control device used to meet a total organic
HAP, vinyl chloride, hydrogen chloride, and/or dioxin/furan emission
limit for process vents in Table 1 or 2 to this subpart, you must
conduct the initial and periodic performance tests required in Sec.
63.11925(d) and (e) and as specified in Sec.  63.11896 using the
applicable test methods and procedures specified in Table 9 to this
subpart and paragraphs (b) through (d) of this section.
    (b) Process operating conditions. You must conduct performance
tests under the conditions specified in paragraphs (b)(1) through (3)
of this section, as applicable. Upon request, the owner or operator
shall make available to the Administrator such records as may be
necessary to determine the conditions of performance tests.
    (1) Continuous process vents. For continuous process vents, you
must conduct all performance tests at maximum representative operating
conditions for the process. For continuous compliance, you must operate
the control device as close as possible to your operating limit(s) for
the control device established during the initial or subsequent
performance tests specified in Sec.  63.11925(d) and (e). If an
operating limit is a range, then you must operate the control device as
close as possible to the maximum or minimum operating limit for the
control device, whichever results in higher emissions (i.e., lower
emission reduction).
    (2) Batch process operations. Testing must be conducted at absolute
worst-case conditions or hypothetical worst-case conditions as
specified in paragraph (c) of this section.
    (3) Combination of both continuous and batch unit operations. You
must conduct performance tests when the batch process vents are
operating at absolute worst-case conditions or hypothetical worst-case
conditions, as specified in paragraphs (c)(1) and (2) of this section,
and at maximum representative operating conditions for the process. For
continuous compliance, you must operate the control device as

close as possible to your operating limit(s) for the control device
established during the initial or subsequent performance tests
specified in Sec.  63.11925 (d) and (e). If an operating limit is a
range, then you must operate the control device as close as possible to
the maximum or minimum operating limit for the control device,
whichever results in higher emissions (i.e., lower emission reduction),
unless the Administrator specifies or approves alternate operating
conditions.
    (c) Batch worst-case conditions. The absolute worst-case conditions
for batch process operations must be characterized by the criteria
presented in paragraph (c)(1) of this section. The hypothetical worst-
case conditions for batch process operations must be characterized by
the criteria presented in paragraph (c)(2) of this section. In all
cases, a site-specific plan must be submitted to the Administrator for
approval prior to testing in accordance with Sec.  63.7(c). The test
plan must include the emission profile described in paragraph (c)(3) of
this section.
    (1) Absolute worst-case conditions. For batch process operations,
absolute worst-case conditions are defined by the criteria presented in
paragraph (c)(1)(i) of this section if the maximum load is the most
challenging condition for the control device. Otherwise, absolute
worst-case conditions are defined by the conditions in paragraph
(c)(1)(ii) of this section. You must consider all relevant factors,
including load and compound-specific characteristics in defining
absolute worst-case conditions.
    (i) A 1-hour period of time in which the inlet to the control
device contains the highest HAP mass loading rate, in pounds per hour,
capable of being vented to the control device. An emission profile as
described in paragraph (c)(3) of this section must be used to identify
the 1-hour period of maximum HAP loading.
    (ii) The period of time when the HAP loading or stream composition
(including non-HAP) is most challenging for the control device. These
conditions include, but are not limited to the following:
    (A) Periods when the stream contains the highest combined organic
load, in pounds per hour, described by the emission profiles in
paragraph (c)(3) of this section.
    (B) Periods when the streams contain HAP constituents that approach
limits of solubility for scrubbing media.
    (C) Periods when the streams contain HAP constituents that approach
limits of adsorptivity for adsorption systems.
    (2) Hypothetical worst-case conditions. For batch process
operations, hypothetical worst-case conditions are simulated test
conditions that, at a minimum, contain the highest hourly HAP load of
emissions that would be predicted to be vented to the control device
from the emissions profile described in paragraphs (c)(3)(ii) or (iii)
of this section.
    (3) Emission profile. For batch process operations, you must
develop an emission profile for the vent to the control device that
describes the characteristics of the vent stream at the inlet to the
control device under worst-case conditions. The emission profile must
be developed based on any one of the procedures described in paragraphs
(c)(3)(i) through (iii) of this section.
    (i) Emission profile by process. The emission profile must consider
all batch emission episodes that could contribute to the vent stack for
a period of time that is sufficient to include all processes venting to
the stack and must consider production scheduling. The profile must
describe the HAP load to the device that equals the highest sum of
emissions from the episodes that can vent to the control device in any
given hour. Emissions per episode must be calculated using the
procedures specified in Sec.  63.11950. Emissions per episode must be
divided by the duration of the episode only if the duration of the
episode is longer than 1 hour.
    (ii) Emission profile by equipment. The emission profile must
consist of emissions that meet or exceed the highest emissions, in
pounds per hour that would be expected under actual processing
conditions. The profile must describe equipment configurations used to
generate the emission events, volatility of materials processed in the
equipment, and the rationale used to identify and characterize the
emission events. The emissions may be based on using a compound more
volatile than compounds actually used in the process(es), and the
emissions may be generated from all equipment in the process(es) or
only selected equipment.
    (iii) Emission profile by capture and control device limitation.
The emission profile must consider the capture and control system
limitations and the highest emissions, in pounds per hour that can be
routed to the control device, based on maximum flowrate and
concentrations possible because of limitations on conveyance and
control equipment (e.g., fans and lower explosive level alarms).
    (d) Concentration correction calculation. If a combustion device is
the control device and supplemental combustion air is used to combust
the emissions, the concentration of total organic HAP, vinyl chloride,
and hydrogen chloride must be corrected as specified in paragraph
(d)(1) or (2) of this section. If a control device other than a
combustion device is used to comply with an outlet concentration
emission limit for batch process vents, you must correct the actual
concentration for supplemental gases as specified in paragraph (d)(3)
of this section.
    (1) Determine the concentration of total organic HAP, vinyl
chloride, or hydrogen chloride corrected to 3-percent oxygen
(Cc) using Equation 1 of this section.
[GRAPHIC] [TIFF OMITTED] TP20MY11.045

Where:

Cc = Concentration of total organic HAP, vinyl chloride,
or hydrogen chloride corrected to 3-percent oxygen, dry basis, parts
per million by volume.
Cm = Concentration of total organic HAP, vinyl chloride,
or hydrogen chloride, dry basis, parts per million by volume.
%O2d = Concentration of oxygen, dry basis, percentage by
volume.

    (2) To determine the oxygen concentration, you must use the
emission rate correction factor (or excess air), integrated sampling
and analysis procedures of Method 3, 3A, or 3B at 40 CFR part 60,
appendix A-2, or ANSI/ASME PTC 19.10-1981, ``Flue and Exhaust Gas
Analyses'' [Part 10, Instruments and Apparatus] (incorporated by
reference, see Sec.  63.14).
    (3) Correct the measured concentration for supplemental gases using
Equation 2 of this section. Process knowledge and representative
operating data may be used to determine the fraction of the total flow
due to supplemental gas.

[GRAPHIC] [TIFF OMITTED] TP20MY11.046

Where:

Ca = Corrected outlet concentration of HAP, dry basis,
parts per million by volume (ppmv).
Cm = Actual concentration of HAP measured at control
device outlet, dry basis, ppmv.
Qa = Total volumetric flow rate of all gas streams vented
to the control device, except supplemental gases.
Qs = total volumetric flow rate of supplemental gases.

Sec.  63.11950  What emissions calculations must I use for an emission
profile by process of my batch process operation?

    Except as specified in paragraph (i) of this section, if you choose
to develop an emission profile by process for your batch process
operation as specified in Sec.  63.11945(c)(3)(i) when determining your
absolute worst-case conditions, you must calculate emissions from
episodes caused by vapor displacement, purging a partially filled
vessel, heating, depressurization, vacuum operations, gas evolution,
air drying, or empty vessel purging, using the applicable procedures in
paragraphs (a) through (h) of this section.
    (a) Vapor displacement. You must calculate emissions from vapor
displacement due to transfer of material using Equation 3 of this
section.
[GRAPHIC] [TIFF OMITTED] TP20MY11.047

Where:

E = Mass of HAP emitted.
V = Volume of gas displaced from the vessel.
R = Ideal gas law constant.
T = Temperature of the vessel vapor space; absolute.
Pi = Partial pressure of the individual HAP.
MWi = Molecular weight of the individual HAP.
n = Number of HAP compounds in the emission stream.
i = Identifier for a HAP compound.

    (b) Gas sweep of a partially filled vessel. You must calculate
emissions from purging a partially filled vessel using Equation 4 of
this section. The pressure of the vessel vapor space may be set equal
to 760 millimeters of mercury (mmHg). You must multiply the HAP partial
pressure in Equation 4 of this section by a HAP-specific saturation
factor determined in accordance with Equations 5 through 7 of this
section. Solve Equation 5 of this section iteratively beginning with
saturation factors (in the right-hand side of the equation) of 1.0 for
each condensable compound. Stop iterating when the calculated
saturation factors for all compounds are the same to two significant
figures for subsequent iterations. Note that for multi-component
emission streams, saturation factors must be calculated for all
condensable compounds, not just the HAP.
[GRAPHIC] [TIFF OMITTED] TP20MY11.048

Where:

E = Mass of HAP emitted.
V = Purge flow rate of the noncondensable gas at the temperature and
pressure of the vessel vapor space.
R = Ideal gas law constant.
T = Temperature of the vessel vapor space; absolute.
Pi = Partial pressure of the individual HAP at saturated
conditions.
Pj = Partial pressure of individual condensable compounds
(including HAP) at saturated conditions.
PT = Pressure of the vessel vapor space.
MWi = Molecular weight of the individual HAP.
t = Time of purge.
n = Number of HAP compounds in the emission stream.
i = Identifier for a HAP compound.
j = Identifier for a condensable compound.
m = Number of condensable compounds (including HAP) in the emission
stream.

[GRAPHIC] [TIFF OMITTED] TP20MY11.049

Where:

Si = Saturation factor for individual condensable
compounds.
Pi = Partial pressure of individual condensable compounds
at saturated conditions.
PT = Pressure of the vessel vapor space.
A = Surface area of liquid.
V = Purge flow rate of the noncondensable gas.
Visat = Volumetric flow rate of individual
condensable compounds at saturated vapor pressure.
Ki = Mass transfer coefficient of individual condensable
compounds in the emission stream.
Ko = Mass transfer coefficient of reference compound
(e.g., 0.83 cm/s for water).
Mo = Molecular weight of reference compound (e.g., 18.02
for water).
Mi = Molecular weight of individual condensable compounds
in the emission stream.
n = Number of condensable compounds in the emission stream.

    (c) Heating. You must calculate emissions caused by the heating of
a vessel to a temperature lower than the boiling point using the
procedures in paragraph (c)(1) of this section. If the contents of a
vessel are heated to the boiling point, you must calculate emissions
using the procedures in paragraph (c)(2) of this section.
    (1) If the final temperature to which the vessel contents are
heated is lower than the boiling point of the HAP in the vessel, you
must calculate the mass of HAP emitted per episode using Equation 8 of
this section. The average gas space molar volume during the heating
process is calculated using Equation 9 of this section. The difference
in the number of moles of condensable in the vessel headspace between
the initial and final temperatures is calculated using Equation 10 of
this section.
[GRAPHIC] [TIFF OMITTED] TP20MY11.050

Where:

E = Mass of HAP vapor displaced from the vessel being heated.
Navg = Average gas space molar volume during the heating
process.
PT = Total pressure in the vessel.
Pi,1 = Partial pressure of the individual HAP compounds
at initial temperature (T1).
Pi,2 = Partial pressure of the individual HAP compounds
at final temperature (T2).
MWHAP = Average molecular weight of the HAP compounds
calculated using Equation 13 of this section.
ni,1 = Number of moles of condensable in the vessel
headspace at initial temperature (T1).
ni,2 = Number of moles of condensable in the vessel
headspace at final temperature (T2).
n = Number of HAP compounds in the emission stream.
ln = Natural logarithm.
[GRAPHIC] [TIFF OMITTED] TP20MY11.051

Where:

Navg = Average gas space molar volume during the heating
process.
V = Volume of free space in vessel.
PT = Total pressure in the vessel.
R = Ideal gas law constant.
T1 = Initial temperature of the vessel.
T2 = Final temperature of the vessel.
[GRAPHIC] [TIFF OMITTED] TP20MY11.052

Where:

V = Volume of free space in vessel.
R = Ideal gas law constant.
T1 = Initial temperature in the vessel.
T2 = Final temperature in the vessel.
Pi,1 = Partial pressure of the individual HAP compounds
at T1.
Pi,2 = Partial pressure of the individual HAP compounds
at T2.
n = Number of HAP compounds in the emission stream.

    (2) If the final temperature to which the vessel contents are
heated is at the boiling point or higher, you must calculate emissions
using the procedure in paragraphs (c)(2)(i) and (ii) of this section.
    (i) To calculate the emissions from heating to the boiling point
use Equations 11, 12, and 13 of this section. (Note that Pa2
= 0 in the calculation of [Delta][eta] in Equation 12 of this section.)
[GRAPHIC] [TIFF OMITTED] TP20MY11.053

Where:

E = Mass of HAP emitted.
[Delta][eta] = The number of moles of noncondensable displaced from
the vessel, as calculated using Equation 12 of this section.
PT = Pressure in the receiver.
Pi = Partial pressure of the individual HAP determined at
the exit temperature of the condenser or at the conditions of the
dedicated receiver.
Pj = Partial pressure of the individual condensable
(including HAP) determined at the exit temperature of the condenser
or at the conditions of the dedicated receiver.
n = Number of HAP compounds in the emission stream.
i = Identifier for a HAP compound.
j = Identifier for a condensable compound.
MWHAP = The average molecular weight of HAP in vapor
exiting the dedicated receiver, as calculated using Equation 13 of
this section with partial pressures determined at the exit
temperature and exit pressure conditions of the condenser or at the
conditions of the dedicated receiver.
m = Number of condensable compounds (including HAP) in the emission
stream.
[GRAPHIC] [TIFF OMITTED] TP20MY11.054

[GRAPHIC] [TIFF OMITTED] TP20MY11.055

Where:

[Delta][eta] = Number of moles of noncondensable gas displaced from
the vessel.
V = Volume of free space in the vessel.
R = Ideal gas law constant.
T1 = Initial temperature of vessel contents, absolute.
T2 = Final temperature of vessel contents, absolute.
Pan = Partial pressure of noncondensable gas in the
vessel headspace at initial (n=1) and final (n=2) temperature.
MWHAP = The average molecular weight of HAP in vapor
exiting the dedicated receiver.
(Pi)Tn = Partial pressure of each HAP in the
vessel headspace at initial (T1) and final (T2) temperature of the
receiver.
MWi = Molecular weight of the individual HAP.
n = Number of HAP compounds in the emission stream.
i = Identifier for a HAP compound.

    (ii) While boiling, the vessel must be operated with a properly
operated process condenser. An initial demonstration that a process
condenser is properly operated must be conducted during the boiling
operation and documented in the notification of compliance status
report described in Sec.  63.11985(a). You must either measure the
liquid temperature in the receiver or the temperature of the gas stream
exiting the condenser and show it is less than the boiling or bubble
point of the HAP(s) in the vessel; or perform a material balance around
the vessel and condenser and show that at least 99 percent of the
recovered HAP vaporized while boiling is condensed. This demonstration
is not required if the process condenser is followed by a condenser
acting as a control device or if the control device is monitored using
a CEMS.
    (d) Depressurization. You must calculate emissions from
depressurization using Equation 14 of this section.
[GRAPHIC] [TIFF OMITTED] TP20MY11.056

Where:

E = Emissions.
V = Free volume in vessel being depressurized.
R = Ideal gas law constant.
T = Temperature of the vessel, absolute.
P1 = Initial pressure in the vessel.
P2 = Final pressure in the vessel.
Pj = Partial pressure of the individual condensable
compounds (including HAP).
MWi = Molecular weight of the individual HAP compounds.
n = Number of HAP compounds in the emission stream.
m = Number of condensable compounds (including HAP) in the emission
stream.
i = Identifier for a HAP compound.
j = Identifier for a condensable compound.
ln = Natural logarithm.

    (e) Vacuum systems. You must calculate emissions from vacuum
systems using Equation 15 of this section if the air leakage rate is
known or can be approximated. The receiving vessel is part of the
vacuum system for purposes of this subpart.
[GRAPHIC] [TIFF OMITTED] TP20MY11.057

Where:

E = Mass of HAP emitted.
PT = Absolute pressure of receiving vessel or ejector