emission point that you do not collect data using your CEMS, CPMS or
other required non-continuous monitoring, as applicable. This does not
include periods of normally scheduled quality assurance activities in
your CEMS performance evaluation and monitoring plan or CPMS monitoring
plan that require the instrument to be offline (e.g., during
calibration checks).
    (5) Any period when you route regulated emissions to a monitored
emission point when the continuous monitoring system (CMS) is not
operating properly or is out of control, as specified in Sec.
65.711(i) or Sec.  65.712(d).

Sec.  65.711  What are the requirements for continuous emission
monitoring systems (CEMS)?

    (a) General. You must comply with the requirements of this section
for each CEMS unless the Administrator specifies or approves a change
(minor, intermediate or major) in methodology or an alternative for the
specified monitoring requirements and procedures, as provided in Sec.
65.240.
    (b) Operation of CEMS. You must install, maintain and operate each
CEMS, as specified in paragraphs (b)(1) through (11) of this section.
    (1) Install each CEMS according to the procedures contained in the
applicable performance specification(s) listed in paragraph (h) of this
section. Locate the sampling probe or other interface at a measurement
location relative to each regulated process unit such that you obtain
representative measurements of emissions from the regulated source
(e.g., on or downstream of the last control device).
    (2) When you combine the regulated emissions from two or more
regulated emission units before release to the atmosphere, you may
install an applicable CEMS for each emissions unit or for the combined
emissions stream, provided the monitoring is sufficient to demonstrate
compliance with the emission limit for each emissions unit.
    (3) If the relevant emission limit is a mass emission standard and
the regulated emissions from a regulated emissions unit are released to
the atmosphere through more than one emission point, you must install
an applicable CEMS at each emission point.
    (4) You must ensure the readout (that portion of the CEMS that
provides a visual display or record), or other indication of emissions,
from any CEMS required for compliance with an emission standard is
readily accessible onsite for operational control or inspection by the
operator of the source.
    (5) You must conduct a CEMS performance evaluation, pursuant to the
schedule specified in the referencing subpart, and periodically, as
specified in your CEMS performance evaluation and monitoring plan
described in paragraph (c) of this section.
    (6) All CEMS must complete a minimum of one cycle of operation
(sampling, analyzing and data recording) for each successive 15-minute
period.
    (7) Except for maintenance periods, instrument adjustments or
checks to maintain precision and accuracy, calibration checks, and zero
and span adjustments, you must operate all CEMS and collect data
continuously when you route regulated emissions to the monitored
emission point.
    (8) Upon submittal of the CEMS performance evaluation and
monitoring plan to the Administrator for approval, you must operate and
maintain each CEMS according to the CEMS performance evaluation and
monitoring plan specified in paragraph (c) of this section.
    (9) You must modify the CEMS performance evaluation and monitoring
plan to incorporate the Administrator's comments and resubmit the plan
for approval to the Administrator within 30 days of receiving the
Administrator's comments. Upon re-submittal to the Administrator for
approval, you must operate and maintain each CEMS in conformance with
the revised CEMS performance evaluation and monitoring plan.
    (10) For each CEMS, you must comply with the procedures for out-of-
control periods described in paragraph (i) of this section.
    (11) You must reduce data from each CEMS, as specified in paragraph
(j) of this section.
    (c) Quality control program. You must develop and implement a CEMS
quality control program documented in a CEMS performance evaluation and
monitoring

plan. You must include in the CEMS performance evaluation and
monitoring plan the information specified in paragraphs (c)(1) through
(3) of this section.
    (1) Routine quality control and assurance procedures that address
the requirements of paragraph (d) of this section.
    (2) CEMS evaluation procedures that meet the requirements of
paragraph (e) of this section.
    (3) Additional information, as listed in paragraph (f) of this
section.
    (d) CEMS performance evaluation and monitoring plan contents--
routine quality control and assurance procedures. In the CEMS
performance evaluation and monitoring plan, you must include a
description of the procedures listed in paragraphs (d)(1) through (6)
of this section and a schedule for conducting these procedures. The
routine procedures must provide an assessment of CEMS performance and
must be consistent with and incorporate applicable provisions of the
procedures specified in paragraph (g) of this section.
    (1) Initial and subsequent calibration of the CEMS and acceptance
criteria.
    (2) Determination and adjustment of the calibration drift of the
CEMS.
    (3) Preventive maintenance of the CEMS, including spare parts
inventory.
    (4) Data recording, calculations and reporting;
    (5) Accuracy audit procedures, including sampling and analysis
methods.
    (6) Program of corrective action for a CEMS that is not operating
properly or is out-of-control.
    (e) CEMS performance evaluation and monitoring plan contents--CEMS
evaluation. In the CEMS performance evaluation and monitoring plan, you
must include the information listed in paragraphs (e)(1) through (6) of
this section.
    (1) A description of the applicable CEMS evaluation procedure
specified in paragraph (h) of this section and the site-specific
details and procedures necessary to describe the applicable procedure
for your specific operation.
    (2) The evaluation program objectives.
    (3) Acceptance criteria.
    (4) An evaluation program summary.
    (5) Data quality objectives. (The pre-evaluation expectations of
precision, accuracy and completeness of data.)
    (6) Conditions that would trigger a CEMS evaluation, which must
include, at a minimum, a newly installed CEMS; an existing CEMS that is
newly used to demonstrate compliance with a referencing subpart and has
not previously had a CEMS evaluation; a process change that is expected
to affect the performance of the CEMS; and the Administrator's request
for a performance evaluation under section 114 of the Clean Air Act. A
CEMS that is newly used to demonstrate compliance with a referencing
subpart that has previously had a CEMS evaluation, as specified in this
paragraph (e) of this section, and has followed routine quality
assurance procedures, as specified in paragraph (d) of this section,
since the previous CEMS evaluation, does not trigger an additional CEMS
evaluation unless a change is also made that is expected to affect the
performance of the CEMS.
    (f) CEMS performance evaluation and monitoring plan contents--
additional information. In the CEMS performance evaluation and
monitoring plan, you must include information that provides background
about the source and monitoring equipment, as specified in paragraphs
(f)(1) through (4) of this section.
    (1) Identification of the pollutant being monitored by the CEMS and
the expected concentrations, including worst case concentrations at
normal operation and during possible process upsets.
    (2) Description of the monitoring equipment, including the
information specified in paragraphs (f)(2)(i) through (vii) of this
section.
    (i) Manufacturer and model number for all monitoring equipment
components.
    (ii) Performance specifications, as provided by the manufacturer
and any differences expected for your installation and operation.
    (iii) Location of the CMS sampling probe or other interface and a
justification of how the location meets the requirements of paragraph
(b)(1) of this section.
    (iv) Placement of the CEMS readout, or other indication of
emissions, indicating how the location meets the requirements of
paragraph (b)(2) of this section.
    (v) Span of the analyzer.
    (vi) Justification of the selection for the specific monitoring
equipment with respect to the pollutant and pollutant concentrations
expected.
    (vii) Identification of the cycle time for the CEMS, indicating
that it meets the requirement of (b)(3) of this section.
    (3) Description of the data collection and reduction systems,
including the information specified in paragraphs (f)(3)(i) through
(iv) of this section.
    (i) A copy of the data acquisition system algorithm used to reduce
the measured data into the reportable form of the standard and
calculate the applicable averages.
    (ii) Identification of whether the algorithm excludes data
collected during CEMS breakdowns, out-of-control periods, repairs,
maintenance periods, instrument adjustments or checks to maintain
precision and accuracy, calibration checks, and zero (low-level), mid-
level (if applicable) and high-level adjustments.
    (iii) If the data acquisition algorithm does not exclude data
collected during CEMS breakdowns, out-of-control periods, repairs,
maintenance periods, instrument adjustments or checks to maintain
precision and accuracy, calibration checks, and zero (low-level), mid-
level (if applicable) and high-level adjustments, then include a
description of your procedure for excluding this data when the averages
calculated, as specified in Sec.  65.855, are determined.
    (iv) If the measured data are converted to the reportable form of
the standard and/or averages calculated manually, documentation of the
calculation procedure.
    (4) Identification of the applicable EPA performance
specification(s) for the CEMS.
    (g) CEMS procedures. You must operate each CEMS in accordance with
each of the applicable procedures in paragraphs (g)(1) through (4) of
this section and the CEMS performance evaluation and monitoring plan in
paragraph (c) of this section.
    (1) Except as provided in paragraphs (g)(2) through (4) of this
section, you must comply with procedure 1 at 40 CFR part 60, appendix
F. If you operate a CEMS, based on Fourier transform infrared
spectroscopy, you must replace the Relative Accuracy Test Audit
requirements of procedure 1 with the validation requirements and
criteria of sections 11.1.1 and 12.0 of Performance Specification 15 of
part 60, appendix B.
    (2) If you operate a particulate matter CEMS, you must comply with
procedure 2 at 40 CFR part 60, appendix F, instead of procedure 1 at 40
CFR part 60, appendix F.
    (3) If you operate a mercury CEMS, you must comply with procedure 5
at 40 CFR part 60, appendix F, instead of procedure 1 at 40 CFR part
60, appendix F.
    (4) If you operate a CEMS, meeting Performance Specification 9 or
15 requirements, you must determine the target analyte(s) for
calibration using either process knowledge of the vent stream or the
presurvey screening procedures in section 16 of Method 18 at 40 CFR
part 60, appendix A-6 on the control device outlet stream.

    (h) Certification. As specified in the CEMS performance evaluation
and monitoring plan in paragraph (c) of this section, you must perform
a CEMS evaluation and certify your CEMS in accordance with the
performance specifications listed in paragraphs (h)(1) through (9) of
this section, as specified in paragraphs (h)(10) and (11) of this
section, and in accordance with your CEMS performance evaluation and
monitoring plan specified in paragraph (c) of this section. Paragraph
(h)(12) of this section provides for situations when the performance
specifications listed in paragraphs (h)(1) through (9) of this section
are not applicable. The performance specifications listed in paragraphs
(h)(1) through (11) of this section are found in appendix B of part 60.
    (1) For particulate matter, Performance Specification 11.
    (2) For hydrogen halides, Performance Specification 15.
    (3) For mercury, Performance Specification 12A or 12B.
    (4) For sulfur dioxide, Performance Specification 2.
    (5) For total hydrocarbons, Performance Specification 8A.
    (6) For speciated organic compounds using a gas chromatograph,
Performance Specification 9.
    (7) For speciated organic compounds using Fourier transform
infrared spectroscopy, Performance Specification 15.
    (8) For oxygen or carbon dioxide, Performance Specification 3.
    (9) For carbon monoxide, Performance Specification 4, if your
emission limit is above 200 ppmv, or Performance Specification 4A if
your emission limit is equal to or less than 200 ppmv.
    (10) If you operate a CEMS meeting Performance Specification 9 or
15, you must determine the target analyte(s) for calibration using
either process knowledge of the vent stream or the pre-survey screening
procedures in section 16 of Method 18 at 40 CFR part 60, appendix A-6
on the control device outlet stream.
    (11) You may only use Performance Specification 15 to measure
hydrogen halides if you are not required to include halogens in your
measurement or you can demonstrate that there are no halogens in the
vent stream.
    (12) If you wish to use a CEMS with no applicable Performance
Specification, you must submit a request for approval to use an
alternate monitoring method according to Sec.  65.240. Your alternative
monitoring method request must include the procedures for a CEMS
evaluation and other information typically contained in a Performance
Specification. This information must also be included in the CEMS
performance evaluation and monitoring plan specified on paragraph (d)
of this section.
    (i) Out-of-control periods. For each CEMS, you must comply with the
out-of-control procedures described in paragraph (i) of this section
when the CEMS is out-of-control, as defined in paragraph (i)(1).
    (1) If the conditions in paragraph (i)(1)(i) or (ii) of this
section occur, the CEMS is out-of-control.
    (i) If the zero (low-level), mid-level (if applicable) or high-
level calibration drift exceeds two times the applicable calibration
drift specification in the applicable performance specification.
    (ii) A CEMS is out of control if the CEMS fails a performance test
audit (e.g., cylinder gas audit), relative accuracy test audit or
linearity test audit.
    (2) When the CEMS is out of control, you must take the necessary
corrective action and repeat all necessary tests that indicate the
system is out of control. You must take corrective action and conduct
retesting until the performance requirements are below the applicable
limits. The beginning of the out-of-control period is the hour you
conduct a performance check (e.g., calibration drift) that indicates an
exceedance of the performance requirements established in this section.
The end of the out-of-control period is the hour following the
completion of corrective action and successful demonstration that the
system is within the allowable limits. You must not use data recorded
during periods the CEMS is out of control in data averages and
calculations, used to report emissions or operating levels, as
specified in Sec.  65.855(b).
    (j) CEMS data reduction. You must reduce data from a CEMS, as
specified in paragraphs (j)(1) through (4) of this section.
    (1) Convert all CEMS emission data into units of the emission limit
of the referencing subpart for reporting purposes using the conversion
procedures specified in that subpart. After conversion into units of
the emission limit, you may round the data to the same number of
significant digits as used in that emission limit.
    (2) If a referencing subpart specifies an emission standard in a
specific percent oxygen, you must correct the concentrations, as
measured by the CEMS in accordance with Sec.  65.826(b).
    (3) Calculate averages, as specified in Sec.  65.855.
    (4) Record the CEMS data, as specified in Sec.  65.860.
    (k) The CEMS performance evaluation and monitoring plan must be
submitted for approval to the Administrator 60 days before the CEMS
evaluation is to be conducted.
    (l) If you are not proposing any alternative monitoring methods and
are intending to demonstrate compliance using the monitoring method(s)
specified in this section, you do not have to wait for approval of your
CEMS performance evaluation and monitoring plan before conducting the
CEMS evaluation or before following the other procedures of the CEMS
performance evaluation and monitoring plan.
    (m) If you are proposing an alternative monitoring method, follow
the procedures in Sec.  65.240.

Sec.  65.712  What are the requirements for continuous parameter
monitoring systems (CPMS)?

    (a) General. You must comply with the requirements of this section
for each CPMS unless the Administrator specifies or approves a change
(minor, intermediate or major) in methodology or an alternative for the
specified monitoring requirements and procedures, as provided in Sec.
65.240.
    (b) Operation of CPMS. You must install, maintain and operate each
CPMS, as specified in paragraphs (b)(1) through (11) of this section.
    (1) Install and locate each CPMS sampling probe or other interface
at a measurement location relative to each regulated process unit or
control device being monitored such that you obtain representative
measurements of the operating parameter from the regulated source or
control device (e.g., on or downstream of the last control device).
    (2) You must ensure the readout (that portion of the CPMS that
provides a visual display or record), or other indication of the
monitored operating parameter from any CPMS required for compliance is
readily accessible onsite for operational control or inspection by the
operator of the source.
    (3) All CPMS must complete a minimum of one cycle of operation
(sampling, analyzing and data recording) for each successive 15-minute
period.
    (4) Except for maintenance periods, instrument adjustments or
checks to maintain precision and accuracy, calibration checks, and zero
and span adjustments, you must operate all CPMS and collect data
continuously when you route regulated emissions to the monitored
emission point.
    (5) Upon submittal of the CPMS monitoring plan to the Administrator
for approval, you must operate and maintain each CPMS according to the

CPMS monitoring plan specified in paragraph (c) of this section.
    (6) You must modify the CPMS monitoring plan to incorporate the
Administrator's comments and resubmit the plan for approval to the
Administrator within 30 days of receiving the Administrator's comments.
Upon re-submittal to the Administrator for approval, you must operate
and maintain each CPMS in conformance with the revised CPMS monitoring
plan.
    (7) For each CPMS, you must comply with the out-of-control
procedures described in paragraphs (d) of this section.
    (8) You must reduce data from a CPMS, as specified in paragraphs
(e) of this section.
    (9) All monitoring equipment must meet the minimum accuracy,
calibration and quality control requirements specified in Table 4 to
this subpart.
    (10) Your CPMS must be capable of measuring the appropriate
parameter over a range that extends from a value that is at least 20
percent less than the lowest value that you expect your CPMS to
measure, to a value that is at least 20 percent greater than the
highest value that you expect your CPMS to measure. The data recording
system associated with each CPMS must have a resolution that is equal
to or better than one-half of the required system accuracy.
    (11) All CPMS must be installed, operational and calibrated, as
specified in paragraph (b) of this section, within 24 hours before
conducting the performance test or, if a performance test is not
required, prior to the compliance date. Subsequent calibrations must be
conducted, as specified in the CPMS monitoring plan, as specified in
paragraph (c) of this section.
    (c) Quality control program. You must develop and implement a CPMS
quality control program documented in a CPMS monitoring plan. The CPMS
monitoring plan must contain the information listed in paragraphs
(c)(1) through (5) of this section.
    (1) The information specified in Sec.  65.225(g).
    (2) Identification of the parameter to be monitored by the CPMS and
the expected parameter range, including worst case and normal
operation.
    (3) Description of the monitoring equipment, including the
information specified in (c)(3)(i) through (viii) of this section.
    (i) Manufacturer and model number for all monitoring equipment
components.
    (ii) Performance specifications, as provided by the manufacturer,
and any differences expected for your installation and operation.
    (iii) The location of the CMS sampling probe or other interface and
a justification of how the location meets the requirements of paragraph
(b)(1) of this section.
    (iv) Placement of the CPMS readout, or other indication of
parameter values, indicating how the location meets the requirements of
paragraph (b)(2) of this section.
    (v) Span of the analyzer.
    (vi) Identify the parameter detected by the parametric signal
analyzer and the algorithm used to convert these values into the
operating parameter monitored to demonstrate compliance, if the
parameter detected is different from the operating parameter monitored.
    (vii) Justification for the selection of the specific monitoring
equipment with respect to the parameter and expected parameter values.
    (viii) Identify the cycle time for the CPMS.
    (4) Description of the data collection and reduction systems,
including the information specified in paragraphs (c)(4)(i) through
(iv) of this section.
    (i) A copy of the data acquisition system algorithm used to reduce
the measured data into the reportable form of the standard and
calculate the applicable averages.
    (ii) Identification of whether the algorithm excludes data
collected during CPMS breakdowns, out-of-control periods, repairs,
maintenance periods, instrument adjustments or checks to maintain
precision and accuracy, calibration checks, and zero (low-level), mid-
level (if applicable) and high-level adjustments.
    (iii) If the data acquisition algorithm does not exclude data
collected during CEMS breakdowns, out-of-control periods, repairs,
maintenance periods, instrument adjustments or checks to maintain
precision and accuracy, calibration checks, and zero (low-level), mid-
level (if applicable) and high-level adjustments, then include a
description of your procedure for excluding this data when the averages
calculated, as specified in Sec.  65.855 are determined.
    (iv) If the measured data are converted to the reportable form of
the standard and/or averages calculated manually, documentation of the
calculation procedure.
    (5) Routine quality control and assurance procedures, including
descriptions of the procedures listed in paragraphs (c)(5)(i) through
(vi) of this section and a schedule for conducting these procedures.
The routine procedures must provide an assessment of CPMS performance.
    (i) Initial and subsequent calibration of the CPMS and acceptance
criteria.
    (ii) Determination and adjustment of the calibration drift of the
CPMS.
    (iii) Daily checks for indications that the system is responding.
If the CPMS system includes an internal system check, you may use the
results to verify the system is responding, as long as you check the
internal system results daily for proper operation and the results are
recorded.
    (iv) Preventive maintenance of the CPMS, including spare parts
inventory.
    (v) Data recording, calculations and reporting.
    (vi) Program of corrective action for a CPMS that is not operating
properly.
    (d) Out-of-control periods. For each CPMS, you must comply with the
out-of-control procedures described in paragraphs (d)(1) and (2) of
this section.
    (1) A CPMS is out-of-control if the zero (low-level), mid-level (if
applicable) or high-level calibration drift exceeds two times the
accuracy requirement of Table 4 of this subpart.
    (2) When the CPMS is out of control, you must take the necessary
corrective action and repeat all necessary tests that indicate the
system is out of control. You must take corrective action and conduct
retesting until the performance requirements are below the applicable
limits. The beginning of the out-of-control period is the hour you
conduct a performance check (e.g., calibration drift) that indicates an
exceedance of the performance requirements established in this section.
The end of the out-of-control period is the hour following the
completion of corrective action and successful demonstration that the
system is within the allowable limits. You must not use data recorded
during periods the CPMS is out of control in data averages and
calculations, used to report emissions or operating levels, as
specified in Sec.  65.855(b).
    (e) CPMS data reduction. You must reduce data from a CPMS, as
specified in paragraphs (e)(1) through (4) of this section.
    (1) You may round the data to the same number of significant
digits, as used in that emission limit.
    (2) Periods of non-operation of the process unit (or portion
thereof), resulting in cessation of the emissions to which the
monitoring applies must not be included in daily averages.
    (3) Calculate averages, as specified in Sec.  65.855.
    (4) The data from a CPMS must be recorded, as specified in Sec.
65.860.
    (f) Monitoring plan submittal date. The CPMS monitoring plan must
be submitted for approval to the

Administrator 60 days before the initial CPMS evaluation is to be
conducted.
    (g) Implementing the monitoring plan. If you are not proposing any
alternative monitoring methods and are intending to demonstrate
compliance using the monitoring method(s) specified in this section,
you do not have to wait for approval of your CPMS monitoring plan
before conducting the performance test or before following the
procedures of the CPMS monitoring plan.
    (h) Alternative monitoring method. If you are proposing an
alternative monitoring method, follow the procedures in Sec.  65.240.

Sec.  65.713  How do I establish my operating limits?

    You must establish operating limits for operating parameters
required to be monitored by this subpart by following the requirements
in this section or you may request approval of monitoring alternatives,
as specified in Sec.  65.884(h).
    (a) You must establish the operating limit for each operating
parameter for each control device, based on the operating parameter
values recorded during the performance test, and may be supplemented by
engineering assessments and/or manufacturer's recommendations.
Performance testing is not required to be conducted over the entire
range of allowed operating parameter values.
    (b) The established operating limit must represent the conditions
for which the control device is meeting the specified emission limit of
the referencing subpart.
    (c) You must establish your operating limit as an operating
parameter range, minimum operating parameter level or maximum operating
parameter level, as specified in Table 3 to this subpart, as
applicable. Where this subpart does not specify which format to use for
your operating limit (e.g., operating range, or minimum/maximum
operating levels), you must determine which format best establishes
proper operation of the control device such that the control device is
meeting the specified emission limit of the referencing subpart.
    (d) The operating limit may be based on ranges or limits previously
established under a referencing subpart. If a performance test is not
required for a control device and, except as specified in Sec.
65.748(b) for biofilters, the operating limit may be based on
engineering assessments and/or manufacturer's recommendations included
in the required design evaluation.
    (e) For batch processes, you may establish operating limits for
individual emission episodes, including each distinct episode of vent
stream emissions, if applicable. If you elect to establish separate
operating limits for different emission episodes within a batch
process, then you must comply with the provisions in paragraphs (e)(1)
and (2) of this section.
    (1) Maintain a daily schedule or log of operating scenarios for
batch processes according to Sec.  65.860(f)(1).
    (2) Provide rationale for each operating limit for each emission
episode in a batch pre-compliance report, as specified in Sec.
65.884(g). You must also report the rationale according to Sec.
65.884(j).

Sec.  65.720  What requirements must I meet for closed vent systems?

    (a) General. If you operate a closed vent system that collects
regulated material from a regulated source, you must meet the
applicable requirements of this section. You must also meet the
applicable requirements of subpart J of this part.
    (b) Collection of emissions. Each closed vent system must be
designed and operated to collect the regulated material vapors from the
emission point, and to route the collected vapors to a control device
with no release to the atmosphere through bypass lines.
    (c) Bypass lines. Use of the bypass at any time to divert a
regulated vent stream is an emissions standards deviation for all
pollutants regulated by the referencing subpart. The use of the bypass
during a performance test invalidates the performance test. You must
comply with the provisions of either paragraphs (c)(1) or (2) of this
section for each closed vent system that contains bypass lines that
could divert a vent stream to the atmosphere.
    (1) Bypass line flow indicator. Install, maintain and operate a
CPMS for flow, as specified in paragraphs (c)(1)(i) and (ii) of this
section.
    (i) Install a CPMS for flow at the entrance to any bypass line. The
CPMS must record the volume of the gas stream that bypassed the control
device.
    (ii) Equip the CPMS for flow with an alarm system that will alert
an operator immediately and automatically when flow is detected in the
bypass line. Locate the alarm such that an operator can easily detect
and recognize the alert.
    (2) Bypass line valve configuration. Secure the bypass line valve
in the non-diverting position with a car-seal or a lock-and-key type
configuration. 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 line.
    (d) Bypass records. For each closed vent system that contains
bypass lines 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 (d)(1) or (2) of this section, as applicable.
    (1) You must maintain records of any alarms triggered because flow
was detected in the bypass line, including the date and time the alarm
was triggered and the duration of the flow in the bypass line. You must
also maintain records of all periods when the vent stream is diverted
from the control device or air intrudes into the control device. You
must include an estimate of the volume of gas, the concentration of
regulated material in the gas and the resulting emissions of regulated
material that bypassed the control device.
    (2) 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 the date that you complete the monthly visual
inspection of the seals or closure mechanisms. You must also record the
occurrence of all periods when the seal or closure mechanism is broken,
the bypass line valve position has changed or the key for a lock-and-
key type lock has been checked out. You must include an estimate of the
volume of gas, the concentration of regulated material in the gas and
the resulting emissions of regulated material that bypassed the control
device.

Sec.  65.724  What requirements must I meet for small boilers and
process heaters?

    (a) Small boiler or process heater monitoring. You must install the
monitoring equipment and meet the requirements specified for small
boilers and process heaters in either Table 1 or Table 2 to this
subpart, even if the small boiler or process heater is part of a fuel
gas system.
    (b) Small boiler or process heater performance test. You must
conduct a performance test, pursuant to Sec. Sec.  65.820 through
65.829, and paragraphs (b)(1) and (2) of this section, even if the
small boiler or process heater is part of a fuel gas system, unless one
of the provisions in paragraph (c) of this section is met.
    (1) When demonstrating compliance with a percent reduction emission
limit in a referencing subpart, you must determine the weight-percent
reduction of organic regulated material or total organic compounds
(minus methane and ethane) across the device by comparing the total
organic compounds (minus methane and ethane) or organic regulated
material in all combusted vent

streams and primary and secondary fuels with the total organic
compounds (minus methane and ethane) or organic regulated material
exiting the combustion device, respectively.
    (2) When determining the weight-percent reduction, you must locate
the sampling sites for the measurement of total organic regulated
material or total organic compound (minus methane and ethane)
concentrations, as applicable, at the inlet of the small boiler or
process heater such that all vent streams and primary and secondary
fuels introduced into the boiler or process heater are included.
    (c) Small boiler or process heater performance test exemptions. You
are not required to conduct a performance test if any of the general
control measures specified in Sec.  65.702(e) are used. You are also
not required to conduct a performance test if your small boiler or
process heater burns hazardous waste and has certified compliance with
the requirements of part 63, subpart EEE of this chapter by conducting
comprehensive performance tests; you have submitted to the
Administrator a notification of compliance under Sec. Sec.  63.1207(j)
and 63.1210(d) documenting compliance with the requirements of part 63,
subpart EEE of this chapter; and you comply with these requirements at
all times, even when you burn non-hazardous waste.
    (d) Boiler or process heater design evaluation. If a referencing
subpart allows you to conduct a design evaluation in lieu of a
performance test, and you chose to do a design evaluation, you must
meet the requirements of Sec.  65.850. The design evaluation must
demonstrate that the small boiler or process heater meets the
applicable emission limit; consider the auto ignition temperature of
the regulated material and the vent stream flow rate; establish the
design minimum and average flame zone temperatures and combustion zone
residence time; and describe the method and location where the vent
stream is introduced into the flame zone.
    (e) Boiler or process heater performance test records. If you have
chosen to monitor operating parameters in Table 2 to this subpart, you
must record the operating parameters, as specified in paragraphs (e)(1)
and (2) of this section, as applicable, measured during each
performance test conducted, pursuant to Sec. Sec.  65.820 through
65.829.
    (1) Record the fire box temperature measured during the performance
test at least every 15 minutes and average the temperature over each
run of the performance test.
    (2) Record a location description of the vent stream junction into
the boiler or process heater.
    (f) Boiler or process heater monitoring records. You must keep the
records specified in paragraphs (f)(1) and (2) of this section up-to-
date and readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).

Sec.  65.726  What monitoring requirements must I meet for thermal
oxidizers?

    (a) Thermal oxidizer monitoring. You must install the monitoring
equipment and meet the requirements specified for thermal oxidizers in
either Table 1 or 2 to this subpart.
    (b) Thermal oxidizer performance test. You must conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, unless
any of the general control measures specified in Sec.  65.702(e) are
used. You are also not required to conduct a performance test if your
thermal oxidizer burns hazardous waste and has certified compliance
with the requirements of part 63, subpart EEE of this chapter by
conducting comprehensive performance tests; you have submitted to the
Administrator a notification of compliance under Sec. Sec.  63.1207(j)
and 63.1210(d) documenting compliance with the requirements of part 63,
subpart EEE of this chapter; and you comply with these requirements at
all times, even when you burn non-hazardous waste.
    (c) Thermal oxidizer design evaluation. If a referencing subpart
allows you to conduct a design evaluation in lieu of a performance
test, and you chose to do a design evaluation, you must meet the
requirements of Sec.  65.850 and, in demonstrating that the oxidizer
meets the applicable emission limit, the design evaluation must
consider the auto-ignition temperature of the regulated material and
the vent stream flow rate and establish the design minimum and average
temperature in the combustion zone and the combustion zone residence
time.
    (d) Thermal oxidizer performance test records. If you have chosen
to monitor operating parameters in Table 2 to this subpart, you must
record the fire box temperature measured during each performance test
conducted, pursuant to Sec. Sec.  65.820 through 65.829. Record the
fire box temperature at least every 15 minutes and average the
temperature over each run of the performance test.
    (e) Thermal oxidizer monitoring records. You must keep the records
specified in paragraphs (e)(1) and (2) of this section up-to-date and
readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).

Sec.  65.728  What monitoring requirements must I meet for catalytic
oxidizers?

    (a) Catalytic oxidizer monitoring. You must install the monitoring
equipment and meet the requirements specified for catalytic oxidizers
in either Table 1 or 2 to this subpart. For catalytic oxidizers for
which you have selected to monitor temperature at the inlet of the
catalyst bed, as specified in Table 2 to this subpart, you must conduct
catalyst checks according to paragraphs (a)(1) and (2) of this section.
    (1) You must conduct sampling and analysis of the catalyst and meet
the requirements of paragraphs (a)(1)(i) through (iv) of this section.
    (i) You must determine a schedule for conducting sampling and
analysis of the catalyst, based upon the expected degradation rate of
the catalyst, and following the manufacturer's or catalyst supplier's
recommended procedures for sampling and analysis.
    (ii) The catalyst sampling and analysis schedule must be included
in the performance test plan specified in Sec.  65.820(b) and approved
by the Administrator.
    (iii) If results from the catalyst sampling and analysis indicate
that your catalyst will become inactive in 18 months or less, you must
replace the catalyst bed or take other corrective action consistent
with the manufacturer's recommendations within 3 months before the
catalyst is anticipated to become inactive or within half the time
available between receiving the catalyst activity report and when the
catalyst is expected to become inactive, whichever is less.
Additionally, you must determine if a more frequent catalyst
replacement schedule is necessary.
    (iv) If you replace the catalyst bed with a catalyst different from
the

catalyst used during the performance test, you must conduct a new
performance test according to paragraph (b) of this section.
    (2) You must conduct annual internal inspections of the catalyst
bed to check for fouling, plugging, mechanical breakdown, channeling,
abrasion and settling, and follow the procedures specified in paragraph
(a)(2)(i) through (iii) of this section.
    (i) If indications of fouling, plugging, mechanical breakdown,
channeling, abrasion or settling are found during the internal
inspection of the catalyst, you must replace the catalyst bed or take
other corrective action consistent with the manufacturer's
recommendations.
    (ii) If you find any of these issues during the annual inspection,
then you must increase your inspection frequency to semi-annual. You
must increase the inspection frequency from semi-annual to quarterly,
and quarterly to monthly, if you find any issues requiring corrective
action during the semi-annual or quarterly inspection. You may return
the inspection frequency to the next less stringent frequency level
when no issues are found during an inspection.
    (iii) If you replace the catalyst bed with a catalyst different
from the catalyst used during the performance test, you must conduct a
new performance test according to paragraph (b) of this section.
    (b) Catalytic oxidizer performance test. You must conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, unless
any of the general control measures specified in Sec.  65.702(e) are
used. You are also not required to conduct a performance test if your
catalytic oxidizer burns hazardous waste and has certified compliance
with the requirements of part 63, subpart EEE of this chapter by
conducting comprehensive performance tests; you have submitted to the
Administrator a notification of compliance under Sec. Sec.  63.1207(j)
and 63.1210(d) documenting compliance with the requirements of part 63,
subpart EEE of this chapter; and you comply with these requirements at
all times, even when you burn non-hazardous waste.
    (c) Catalytic oxidizer design evaluation. If a referencing subpart
allows you to conduct a design evaluation in lieu of a performance
test, and you chose to do a design evaluation, you must meet the
requirements of Sec.  65.850 and, in demonstrating that the oxidizer
meets the applicable emission limit, the design evaluation must
consider the vent stream flow rate and you must establish the design
minimum and average temperatures across the catalyst bed inlet and
outlet.
    (d) Catalytic oxidizer performance test records. If you have chosen
to monitor operating parameters in Table 2 to this subpart, you must
record the upstream and downstream temperatures and the temperature
difference across the catalyst bed measured during each performance
test conducted, pursuant to Sec. Sec.  65.820 through 65.829. Record
the upstream and downstream temperatures and the temperature difference
across the catalyst bed at least every 15 minutes and average each
temperature and temperature differential over each run of the
performance test.
    (e) Catalytic oxidizer monitoring records. You must keep the
records specified in paragraphs (e)(1) and (2) of this section up-to-
date and readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).
    (f) Catalytic oxidizer other records. For catalytic oxidizers for
which you have selected the monitoring specified in Table 2 to this
subpart, you must also maintain records of the results of the catalyst
sampling and inspections required by paragraphs (a)(1) and (2) of this
section, including any subsequent corrective actions taken.

Sec.  65.732  What monitoring requirements must I meet for fuel gas
systems?

    (a) You must submit a statement that the emission stream is
connected to the fuel gas system in the Notification of Compliance
Status Report, as required, pursuant to Sec.  65.880(b).
    (b) You must meet the requirements of subpart J of this part for
all components of a fuel gas system.
    (c) If you have small boilers or process heaters that are part of a
fuel gas system, you must also comply with the provisions of Sec.
65.724 for the small boilers or process heaters.
    (d) You must not route halogenated vent streams to a fuel gas
system unless the requirements of Sec.  65.702(d) are met.

Sec.  65.740  What monitoring requirements must I meet for absorbers?

    (a) Absorber monitoring. You must install the monitoring equipment
and meet the requirements specified for absorbers in either Table 1 or
2 to this subpart.
    (b) Absorber performance test. You must conduct a performance test,
pursuant to Sec. Sec.  65.820 through 65.829, unless any of the general
control measures specified in Sec.  65.702(e) are used.
    (c) Absorber design evaluation. If a referencing subpart allows you
to conduct a design evaluation in lieu of a performance test, and you
chose to do a design evaluation, you must meet the requirements of
Sec.  65.850 and, in demonstrating that the absorber meets the
applicable emission limit, address the characteristics specified in
paragraphs (c)(1) and (2) of this section, as applicable.
    (1) For an absorber, the design evaluation must consider the vent
stream composition, constituent concentrations, liquid-to-gas ratio,
absorber liquid flow rate and concentration, temperature, pressure drop
and the reaction kinetics or absorption characteristics of the
constituents with the scrubbing liquid. The design evaluation must
establish the design exhaust vent stream organic compound concentration
level.
    (2) For tray and packed column absorbers, the design evaluation
must consider the characteristics specified in paragraph (c)(1) of this
section, in addition to type and total number of theoretical and actual
trays, type and total surface area of packing for the entire column and
type and total surface area for individual packed sections if the
column contains more than one packed section.
    (d) Absorber performance test records. If you have chosen to
monitor operating parameters in Table 2 to this subpart, you must keep
readily accessible records of the data specified in paragraphs (d)(1)
and (2) of this section, as applicable, measured during each
performance test conducted, pursuant to Sec. Sec.  65.820 through
65.829.
    (1) The absorber influent liquid flow rate or liquid-to-gas ratio
measured during the performance test. Record the influent liquid flow
rate or liquid-to-gas ratio at least every 15 minutes and average the
flow rate or liquid-to-gas ratio over each run of the performance test.
    (2) If applicable, the pressure drop through the absorber, the pH
of the absorber liquid effluent, exit gas temperature, inlet gas
temperature, specific gravity, liquid feed pressure, oxidation chemical
flow rate and/or the oxidation chemical strength of the absorber liquid
influent measured during the performance test. Record the pressure drop
through the absorber, the pH of the absorber liquid effluent, exit gas
temperature, inlet gas temperature, specific gravity, liquid feed
pressure, oxidation chemical flow rate and/or the

oxidation chemical strength of the absorber liquid influent at least
every 15 minutes and average each operating parameter over each run of
the performance test.
    (e) Absorber monitoring records. You must keep the records
specified in paragraphs (e)(1) and (2) of this section up-to-date and
readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in paragraph Sec.  65.860(a).

Sec.  65.742  What monitoring requirements must I meet for adsorbers
regenerated onsite?

    (a) General. If you use regenerative adsorption systems that you
regenerate onsite, you must treat the regulated materials extracted
from the adsorption system as process wastewater or process vents
subject to control levels required by the referencing subpart.
    (b) Regenerative adsorber monitoring. You must install the
monitoring equipment and conduct the monitoring, as specified in either
Table 1 or Table 2 to this subpart for regenerative adsorption systems
that you regenerate onsite. For regenerative adsorbers, except those
monitored with CEMS, you must also conduct the checks specified in
paragraphs (c) and (d) of this section, include in your monitoring plan
required in Sec.  65.712(c) your plans for complying with paragraph (d)
of this section and develop a corrective action plan, as specified in
paragraph (e) of this section.
    (c) Regenerative adsorber valve and cycle verification. For
regenerative adsorbers, except those monitored with CEMS, 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 confirm that the adsorber
is operating with proper valve sequencing and cycle time.
    (d) Regenerative adsorber weekly measurements. For regenerative
adsorbers, except those monitored with CEMS, you must conduct weekly
measurements of each adsorber bed outlet volatile organic compounds or
regulated materials concentration over the last 5 minutes of an
adsorption cycle using the methods and procedures in paragraph (d)(1)
of this section. If the measured concentration is greater than the
maximum normal concentration established in paragraph (d)(2) of this
section, you must take corrective action, as specified in the
corrective action plan required in paragraph (e) of this section.
    (1) You must measure the concentration using the method that you
used to establish the maximum normal concentration, and the method must
be one of the methods specified in paragraphs (d)(1)(i) through (iii)
of this section. You must use Method 1 or 1A at 40 CFR part 60,
appendix A-1 to select the sampling location, which should be at the
centrally located 10-percent area of the stack or sample port cross-
section.
    (i) Use chromatographic analysis by using Method 18 at 40 CFR part
60, appendix A. Calibrate the instrument following the procedures
described in EPA Method 18 using a calibration gas or gas mixture
containing the compounds present in the adsorber vent gas that can be
measured by the method.
    (ii) Use a portable analyzer, in accordance with Method 21 at 40
CFR part 60, appendix A-7, for open-ended lines. Where EPA Method 21
uses the term ``leak definition,'' you must substitute the term
``maximum normal concentration.'' Calibrate the instrument following
the procedures described in EPA Method 21 using one of the calibration
gases specified in paragraphs (d)(1)(ii)(A) through (D) of this
section.
    (A) A calibration gas or gas mixture representative of the normal
compound(s) present in the adsorber vent gas.
    (B) Propane.
    (C) Methane.
    (D) Isobutylene.
    (iii) Use a flame ionization analyzer by using Method 25A at 40 CFR
part 60, appendix A-7. Calibrate the instrument following the
procedures described in EPA Method 25A using propane.
    (2) You must establish a maximum normal concentration for each
adsorber bed vent gas, as specified in paragraphs (d)(2)(i) through
(iv) of this section.
    (i) For each adsorber bed, measure the outlet volatile organic
compound or regulated material concentration weekly, as specified in
paragraph (d) of this section, during the last 5 minutes of the
adsorption cycle for at least 8 weeks. These measurements must be taken
within a 90-day time period.
    (ii) Calculate the average outlet concentration for each adsorber
bed as the average of the outlet concentrations measured, as required
in paragraph (d)(2)(i) of this section.
    (iii) Determine maximum normal concentration for each adsorber bed
as the 99th percentile confidence level using the one-sided z-statistic
test described in Equation 1 of this section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.138

Where:

P99 = 99th percentile confidence level pollutant
concentration in parts per million.
Mean = Arithmetic average of the volatile organic compound or
regulated material concentration in the adsorber vent gas,
calculated as specified in paragraph (d)(2)(ii) of this section.
SD = Standard deviation of the mean pollutant concentration,
calculated as specified in paragraph (d)(2)(ii) of this section.
t = t distribution critical value for 99th percentile (0.01)
probability for the appropriate degrees of freedom (number of
samples minus one), as obtained from a Distribution Critical Value
Table. Use a value of 3 if you have 8 samples.

    (iv) You must reestablish your maximum normal concentration for an
adsorber bed according to paragraphs (d)(2)(i) through (iii) of this
section each time you replace the adsorbent in an adsorber bed.
    (e) Regenerative adsorber corrective action plan. For regenerative
adsorbers, except those monitored with CEMS, you must develop a
corrective action plan describing corrective actions to be taken and
the timing of those actions when a weekly measurement is above the
maximum normal concentration. The plan must specify that you will
initiate procedures to identify the cause and take corrective action no
later than 8 hours after the weekly measurement. Three consecutive
weekly measurements greater than the maximum normal concentration is a
deviation. Examples of corrective actions that could be included in
your plan are listed in paragraphs (e)(1) through (6) of this section.
    (1) Analyze the adsorber inlet vent to determine if inlet
concentrations are in the expected range.

    (2) Obtain samples at other locations in the system to determine if
conditions are normal.
    (3) Verify the system temperatures, regeneration stream mass and
other operational parameters are within normal ranges.
    (4) Test the operation of valves in the system, verify the valves
are working as intended and not allowing gas to pass through when
closed.
    (5) Obtain a sample of the carbon to check for bed poisoning or
deterioration of the carbon.
    (6) Replace the adsorbent in the adsorber bed with fresh adsorbent.
    (f) Regenerative adsorber performance test. You must conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, unless
any of the general control measures specified in Sec.  65.702(e) are
used.
    (g) Regenerative adsorber design evaluation. If a referencing
subpart allows you to conduct a design evaluation in lieu of a
performance test, and you chose to do a design evaluation, you must
meet the requirements of Sec.  65.850 and, in demonstrating that the
absorber meets the applicable emission limit, address the following
characteristics, as applicable. For an adsorption system that
regenerates the adsorber bed directly onsite in the control device,
such as a fixed-bed adsorber, the design evaluation must consider the
vent stream mass flow rate, vent stream composition and concentrations,
relative humidity, and temperature and must establish the design
exhaust vent stream organic compound concentration level, adsorption
cycle time, number and capacity of adsorber beds, type and working
capacity of adsorbent used for adsorber beds, design total regeneration
stream mass flow over the period of each complete adsorber bed
regeneration cycle, design adsorber bed temperature after regeneration,
design adsorber bed regeneration time and design service life of
adsorbent. For vacuum desorption, the lowest required vacuum level and
duration needed to assure regeneration of the beds must be considered.
    (h) Regenerative adsorber performance test records. If you are
required to conduct a performance test, you must keep readily
accessible records of the data specified in paragraphs (h)(1) through
(5) of this section, as applicable, measured during each performance
test conducted, pursuant to Sec. Sec.  65.820 through 65.829.
    (1) For non-vacuum regenerative adsorbers, you must record the
total regeneration stream mass flow during each adsorber bed
regeneration cycle during the period of the performance test, and
temperature of the adsorber bed after each regeneration during the
period of the performance test (and within 15 minutes of completion of
any cooling cycle or cycles).
    (2) For non-vacuum regeneration adsorbers, you must record the
adsorber bed temperature during regeneration, except for any
temperature regulating (cooling or warming to bring bed temperature
closer to vent gas temperature) portion of the regeneration cycle.
    (3) For vacuum regenerative adsorbers, you must record the vacuum
profile over time during each regeneration cycle, and the period of
time the vacuum level is below the minimum target level during the
period of the performance test.
    (4) You must record regeneration frequency and duration during the
period of the performance test.
    (5) You must record the observations of the verification of the
adsorber operation during the period of the performance test.
    (i) Regenerative adsorber monitoring records. You must keep the
records specified in paragraphs (i)(1) and (2) of this section up-to-
date and readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
and emissions required to be monitored under paragraph (b) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).
    (j) Regenerative adsorber other records. For regenerative
adsorbers, except those monitored with CEMS, you must also maintain
records, as specified in paragraphs (j)(1) through (6) of this section.
    (1) The corrective action plan required in paragraph (e) of this
section.
    (2) For the adsorber verification required in paragraph (c) of this
section, you must maintain daily records of the verification
inspections, including the visual observations and/or any activation of
an automated alarm or shutdown system with a written entry into a log
book or other permanent form of record.
    (3) For the monitoring required in paragraph (d) of this section,
you must record the weekly volatile organic compound or regulated
material outlet concentration observed over the last 5 minutes of the
adsorption cycle for each adsorber bed.
    (4) If the measured concentration obtained during the monitoring
required in paragraph (d) of this section is greater than the maximum
normal concentration for 3 consecutive weekly measurements, you must
keep a record of these periods, including the date of the third
measurement and the date and time when the concentration becomes less
than the maximum normal concentration, or when the adsorbent is
replaced.
    (5) You must keep records of the measurements used to determine the
maximum normal concentrations established for each adsorber bed.
    (6) You must keep records of the date and time the adsorbent is
replaced and which adsorbent bed was replaced.

Sec.  65.744  What monitoring requirements must I meet for non-
regenerative adsorbers?

    (a) Non-regenerative adsorber monitoring. You must install the
monitoring equipment and meet the requirements specified for non-
regenerative adsorbers in either Table 1 or Table 2 to this subpart.
Non-regenerative adsorbers include adsorbers that cannot be regenerated
and regenerative adsorbers that are regenerated offsite. For non-
regenerative adsorbers for which you have selected the monitoring
specified in Table 2 to this subpart, you must also comply with
paragraph (a)(1) of this section, and you may reduce your monitoring
frequency according to paragraphs (a)(2) of this section.
    (1) The first adsorber in series must be replaced immediately when
breakthrough, as defined in Sec.  65.295, 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, ``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.
    (2) In lieu of the daily monitoring, as specified in Table 3 to
this subpart, you may reduce your monitoring frequency by establishing
the average adsorber bed life. To establish the average adsorber bed
life, you must conduct daily monitoring of the outlet volatile organic
compound or regulated material concentration of the first adsorber bed
in series until breakthrough, as defined in Sec.  65.295, occurs for
the first three adsorber bed change-outs. You must re-establish an
average adsorber bed life if you change the adsorbent brand or type,

or if any process changes are made that would lead to a lower bed
lifetime. You must measure the outlet concentration of volatile organic
compounds or outlet concentration of regulated material(s) in
accordance with Table 2 to this subpart. Once the average life of the
bed is determined, you may conduct ongoing monitoring, as specified in
paragraphs (a)(2)(i) and (ii) of this section.
    (i) You may conduct monthly monitoring if the adsorbent has more
than 2 months of life remaining, based on the average adsorber bed
life, as established in paragraph (a)(2) of this section, and the date
the adsorbent was last replaced.
    (ii) You may conduct weekly monitoring if the adsorbent has more
than 2 weeks of life remaining, based on the average adsorber bed life,
established in paragraph (a)(2) of this section, and the date the
adsorbent was last replaced.
    (b) Non-regenerative adsorber performance test. You must conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, unless
any of the general control measures specified in Sec.  65.702(e) are
used.
    (c) Non-regenerative adsorber design evaluation. If a referencing
subpart allows you to conduct a design evaluation in lieu of a
performance test, and you chose to do a design evaluation, you must
meet the requirements of Sec.  65.850 and, in demonstrating that the
absorber meets the applicable emission limit, address the following
characteristics, as applicable. For an adsorption system that does not
regenerate the adsorber bed directly on site in the control device,
such as a carbon canister, the design evaluation must consider the vent
stream mass flow rate, vent stream composition and concentrations,
relative humidity and temperature and must establish the design exhaust
vent stream organic compound concentration level, capacity of adsorber
bed, type and working capacity of adsorbent used for the adsorber bed
and design adsorbent replacement interval, based on the total adsorbent
working capacity of the control device and source operating schedule.
    (d) Non-regenerative adsorber performance test records. If you are
required to conduct a performance test, you must keep readily
accessible records of the outlet volatile organic compound or regulated
material concentration for each adsorber bed, as provided in Table 2 to
this subpart, measured during each performance test conducted, pursuant
to Sec. Sec.  65.820 through 65.829. You must also keep records of the
date and time you last replaced the adsorbent.
    (e) Non-regenerative adsorber monitoring records. You must keep the
records specified in paragraphs (e)(1) and (2) of this section up-to-
date and readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).
    (f) Non-regenerative adsorber other records. For non-regenerative
adsorbers for which you have selected the monitoring specified in Table
2 to this subpart, you must also maintain records, as specified in
paragraph (f)(1) and (2) of this section.
    (1) Records of the date and time you replace the adsorbent.
    (2) If you conduct monitoring less frequently than daily, as
specified in Table 2 to this subpart, you must record the average life
of the bed.

Sec.  65.746  What requirements must I meet for condensers?

    (a) Condenser monitoring. You must install the monitoring equipment
and meet the requirements specified for condensers in either Table 1 or
Table 2 to this subpart.
    (b) Condenser performance test. You are not required to conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, unless
required by a referencing subpart. Instead, you must conduct a design
evaluation, as specified in paragraph (c) of this section, unless you
choose to use a CEMS meeting the requirements in Sec.  65.711 to
monitor the performance of the condenser.
    (c) Condenser design evaluation. If you chose to do a design
evaluation in lieu of using CEMS meeting the requirements in Sec.
65.711, you must meet the requirements of Sec.  65.850 and, in
demonstrating that the condenser meets the applicable emission limit,
address the characteristics specified in paragraphs (c)(1) and (2) of
this section, as applicable.
    (1) The design evaluation must consider the vent stream flow rate,
relative humidity, temperature and conditions under which entrainment
of the condensing liquid could occur, and must establish the design
outlet organic regulated material compound concentration level, design
average temperature of the condenser exhaust vent stream and the design
average temperatures of the coolant fluid at the condenser inlet and
outlet.
    (2) You must establish your operating limit for temperature of the
condensate receiver and calculate the resulting regulated material
concentration using the methodologies in Sec.  65.835(d) to demonstrate
compliance with the emissions standard of the referencing subpart.
    (d) Condenser monitoring records. You must keep the records
specified in paragraphs (d)(1) and (2) of this section up-to-date and
readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).
    (e) Condenser other records. If you chose to do a design evaluation
in lieu of using CEMS meeting the requirements in Sec.  65.711, you
must calculate and record the regulated material concentration using
continuous and direct measurements of the condensate receiver
temperature and the methodology in Sec.  65.835(d).

Sec.  65.748  What requirements must I meet for biofilters?

    (a) Biofilter monitoring. You must install the monitoring equipment
and meet the requirements specified for biofilters in either Table 1 or
Table 2 to this subpart.
    (b) Biofilter performance test. You must conduct a performance
test, pursuant to Sec. Sec.  65.820 through 65.829, and paragraphs
(b)(1) through (3) of this section, unless one of the provisions in
paragraph (c) of this section is met.
    (1) The operating temperature limit must be based on only the
temperatures measured during the performance test; these data may not
be supplemented by engineering assessments or manufacturer's
recommendations, as otherwise allowed in Sec.  65.713(a).
    (2) You may expand the biofilter bed temperature operating limit by
conducting a repeat performance test that demonstrates compliance with
the percent reduction requirement or outlet concentration limit, as
applicable.
    (3) You must conduct a repeat performance test using the applicable
methods specified in Sec.  65.825 within 2 years following the previous

performance test and within 150 days after each replacement of any
portion of the biofilter bed media with a different type of media or
each replacement of more than 50 percent (by volume) of the biofilter
bed media with the same type of media.
    (c) Biofilter performance test exemptions. You are not required to
conduct a performance test if any of the general control measures
specified in Sec.  65.702(e) are used. If the operating limit is
established using data from previous performance tests in accordance
with Sec.  65.702(e)(4), replacement of the biofilter media with the
same type of media is not considered a process change and would not
require a new performance test; however, you are still subject to the
repeat performance test requirements, as specified in paragraph (b)(3)
of this section.
    (d) Biofilter design evaluation. If a referencing subpart allows
you to conduct a design evaluation in lieu of a performance test, and
you chose to do a design evaluation, you must meet the requirements of
Sec.  65.850 and, in demonstrating that the biofilter meets the
applicable emission limit, address the characteristics specified in the
referencing subpart.
    (e) Biofilter performance test records. If you are required to
conduct a performance test, you must record the biofilter bed
temperature and moisture content, and the pressure drop through the
biofilter bed measured during each performance test conducted, pursuant
to Sec. Sec.  65.820 through 65.829. You must record the biofilter bed
temperature, moisture content and the pressure drop through the
biofilter bed at least every 15 minutes and average these operating
parameters over each run of the performance test.
    (f) Biofilter monitoring records. You must keep the records
specified in paragraphs (f)(1) and (2) of this section up-to-date and
readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (a) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).

Sec.  65.760  What requirements must I meet for sorbent injection and
collection systems?

    (a) General. If you use sorbent injection as an emission control
technique, you must operate the sorbent injection system in accordance
with this section. You must also meet the requirements in Sec.  65.762
for the fabric filters used for sorbent collection.
    (b) Sorbent injection monitoring. You must install the monitoring
equipment and meet the requirements specified for sorbent injection in
either Table 1 or Table 2 to this subpart.
    (c) Sorbent injection performance test. You must conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, and
paragraphs (c)(1) and (2) of this section, unless one of the general
control measures specified in Sec.  65.702(e) is used. A performance
test conducted to meet the requirements of this section also satisfies
the performance test requirements of Sec.  65.762(b) provided that you
monitor and record the appropriate fabric filter operating parameters
during the performance test.
    (1) You must conduct the performance test at the outlet of the
fabric filter used for sorbent collection.
    (2) If the sorbent is replaced with a different brand and type of
sorbent that was used during the performance test, you must conduct a
new performance test.
    (d) Sorbent injection design evaluation. If a referencing subpart
allows you to conduct a design evaluation in lieu of a performance
test, and you chose to do a design evaluation, you must meet the
requirements of Sec.  65.850 and, in demonstrating that the sorbent
injection system meets the applicable emission limit, address the
characteristics specified in paragraphs (d)(1) and (2) of this section,
as applicable.
    (1) For a sorbent injection system, the design evaluation must
consider the vent stream flow rate and temperature, levels of regulated
materials to be adsorbed in the vent stream, sorbent type and brand,
sorbent mass injection rate, sorbent injection carrier gas system,
design of the injection system, location of sorbent injection site,
downstream collection device (fabric filter or other device to capture
the sorbent), residence time of the gas-sorbent mixture and contact
characteristics of the gas-sorbent mixture.
    (2) For a sorbent injection system that is controlling dioxins,
furans, total hazardous air pollutants (HAP) or total organic HAP, as
specified in Table 2 to this subpart, you must consider the temperature
in the combustion device and in any particulate control devices
upstream of injection system.
    (e) Sorbent injection performance test records. If you are required
to conduct a performance test, you must keep readily accessible records
of the data specified in paragraphs (e)(1) and (2) of this section, as
applicable, measured during each performance test conducted, pursuant
to Sec. Sec.  65.820 through 65.829.
    (1) Record the brand and type of sorbent used during the
performance test.
    (2) If you have chosen to monitor operating parameters in Table 2
to this subpart, you must record the parameters, as specified in
paragraphs (e)(2)(i) through (iii) of this section, as applicable.
    (i) Record the rate of sorbent injection measured during the
performance test at least every 15 minutes and average the injection
rate over each run of the performance test.
    (ii) Record the carrier gas flow rate measured during the
performance test at least every 15 minutes and average the flow rate
over each run of the performance test.
    (iii) Record the temperature downstream of the combustion device
and/or downstream of any particulate control devices, as applicable,
measured during the performance test. Record the temperature(s) at
least every 15 minutes and average the temperature(s) over each run of
the performance test.
    (f) Sorbent injection monitoring records. You must keep the records
specified in paragraphs (f)(1) and (2) of this section up-to-date and
readily accessible, as applicable.
    (1) Continuous records of the control device operating parameters
or emissions specified to be monitored under paragraph (b) of this
section, as applicable.
    (2) Records of the daily average value, or for batch operations,
operating block average value, of each continuously monitored operating
parameter or records of continuous emissions according to the
procedures specified in Sec.  65.860(a).
    (g) Sorbent injection other records. You must keep records of the
type and brand of sorbent used. If the type or brand of sorbent is
changed, you must record the date the sorbent was changed, and maintain
documentation that the substitute will provide the same or better level
of control as the original sorbent.

Sec.  65.762  What requirements must I meet for fabric filters?

    (a) Fabric filter monitoring. You must equip fabric filters with a
bag leak detection system that is installed, calibrated, maintained and
continuously operated according to the requirements in paragraphs
(a)(1) through (10) of this section. Monitoring systems associated with
bag leak detection are also subject to the requirements of Sec.
65.710.
    (1) Install a bag leak detection sensor(s) in a position(s) that
will be representative of the relative or absolute particulate matter
loadings for each exhaust stack, roof vent or compartment (e.g., for a
positive pressure fabric filter) of the fabric filter.
    (2) Use a bag leak detection system certified by the manufacturer
to be capable of detecting particulate matter emissions at
concentrations of 1 milligram per actual cubic meter (0.00044 grains
per actual cubic foot) or less.
    (3) Conduct a performance evaluation of the bag leak detection
system in accordance with paragraph (b) of this section and consistent
with the guidance provided in EPA-454/R-98-015 (incorporated by
reference, see Sec.  65.265).
    (4) Use a bag leak detection system equipped with a device to
continuously record the output signal from the sensor.
    (5) Use a bag leak detection system equipped with a system that
will sound an alarm when an increase in relative particulate material
emissions over a preset level is detected. The alarm must be located
such that the alert is observed readily by plan operating personnel.
    (6) Install a bag leak detection system in each compartment or cell
for positive pressure fabric filter systems that do not duct all
compartments or cells to a common stack. Install a bag leak detector
downstream of the fabric filter if a negative pressure or induced air
filter is used. 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 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 a CPMS monitoring plan required in Sec.
65.712 and paragraph (e)(1) of this section. 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) Each bag leak detection system must be operated and maintained
such that the alarm does not sound more than 5 percent of the operating
time during a 6-month period. If the alarm sounds more than 5 percent
of the operating time during a 6-month period, it is considered an
operating parameter exceedance and, therefore, a deviation, as
specified in Sec.  65.710(e)(2). You must calculate the alarm time, as
specified in paragraphs (a)(9)(i) through (iv) of this section.
    (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 is 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.
    (10) If the alarm on a bag leak detection system is triggered, you
must, within 1 hour of an alarm, initiate procedures to identify the
cause of the alarm and take corrective action, as specified in the
corrective action plan required in paragraph (e)(2) of this section.
    (b) Fabric filter performance test. You must conduct a performance
test, pursuant to Sec. Sec.  65.820 through 65.829, unless one of the
general control measures specified in Sec.  65.702(e) is used. A
performance test conducted to meet the requirements of this section
also satisfies the performance test requirements of Sec.  65.760(c)
provided that Sec.  65.760(c)(1) and (2) are followed and the
appropriate sorbent injection operating parameters are monitored and
recorded.
    (c) Fabric filter design evaluation. If a referencing subpart
allows you to conduct a design evaluation in lieu of a performance
test, and you chose to do a design evaluation, you must meet the
requirements of Sec.  65.850. The design evaluation must include the
pressure drop through the device and the ratio of volumetric gas flow
to surface area of the cloth.
    (d) Fabric filter performance test records. You must document the
bag leak detection system's sensitivity to detecting changes in
particulate matter emissions, range, averaging period and alarm set
points during each performance test conducted, pursuant to Sec. Sec.
65.820 through 65.829.
    (e) Fabric filter monitoring records. For each bag leak detector
used to monitor regulated material emissions from a fabric filter, you
must maintain the records specified in paragraphs (e)(1) through (3) of
this section.
    (1) A CPMS monitoring plan, as specified in Sec.  65.712. You must
also include performance evaluation procedures and acceptance criteria
(e.g., calibrations) in your CPMS monitoring plan, including how the
alarm set-point will be established.
    (2) A corrective action plan describing corrective actions to be
taken and the timing of those actions when the bag leak detection alarm
sounds. You must initiate corrective action no later than 48 hours
after a bag leak detection system alarm. Failure to take action within
the prescribed time period is considered a deviation. Corrective
actions may include, but are not limited to, the actions listed in
paragraphs (e)(2)(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
regulated material emissions.
    (ii) Sealing off defective bags or filter media.
    (iii) Replacing defective bags or filter media or otherwise fixing
the control device.
    (iv) Sealing off a defective fabric filter compartment.
    (v) Cleaning the bag leak detection system probe or otherwise
fixing the bag leak detection system.
    (vi) Shutting down the process producing the regulated material
emissions.
    (3) Records of any bag leak detection system alarm, including the
date, time, duration and the percent of the total operating time during
each 6-month period that the alarm sounds, with a brief explanation of
the cause of the alarm, the corrective action taken and the schedule
and duration of the corrective action.
    (f) You must submit analyses and supporting documentation
demonstrating conformance with EPA-454/R-98-015 (incorporated by
reference, see Sec.  65.265) and specifications for bag leak detection
systems as part of the Notification of Compliance Status Report, as
required, pursuant to Sec.  65.880(f).

Sec.  65.800  What requirements must I meet for other control devices?

    (a) Other control device monitoring. If you use a control device
other than those listed in this subpart, you must

meet the requirements of paragraphs (a)(1) and (2) of this section.
    (1) You must submit to the Administrator for approval the planned
operating parameters to be monitored, and the recordkeeping and
reporting procedures, as specified in Sec.  65.884(h). You must also
include a rationale for the proposed monitoring in your submittal. 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) If you receive approval from the Administrator for the
information required in paragraph (a)(1) of this section, you must then
establish an operating limit for the operating parameters that
indicates proper operation of the control device. The information
required in Sec.  65.880(d) must be submitted in the Notification of
Compliance Status Report. The operating limit may be based upon a prior
performance test meeting the specifications of Sec.  65.702(e)(4).
    (b) Other control device performance test. You must conduct a
performance test, pursuant to Sec. Sec.  65.820 through 65.829, as
applicable, unless any of the general control measures specified in
Sec.  65.702(e) are used.
    (c) Other control device performance test records. If you are
required to conduct a performance test, you must keep readily
accessible records of the approved operating parameters, as established
in paragraph (a) of this section measured during the performance test
and any other records as may be necessary to determine the conditions
of the performance test conducted, pursuant to Sec. Sec.  65.820
through 65.829.
    (d) Other control device records. You must keep the records
specified in paragraphs (d)(1) and (2) of this section up-to-date and
readily accessible, as applicable.
    (1) You must keep records of the operating parameter(s) monitored,
pursuant to the approved plan established in paragraph (a) of this
section.
    (2) Records of flow/no flow, as provided in Sec.  65.860(i).

Performance Testing

Sec.  65.820  What are the performance testing requirements?

    For each control device for which a performance test is required,
you must conduct a performance test according to the schedule specified
by the referencing subpart and the procedures in this section
Sec. Sec.  65.820 through 65.829, as applicable, unless any of the
general control measures specified in Sec.  65.702(e) are used. For all
performance tests, a notification of the performance test and a
performance test plan are also required, as specified in paragraphs (a)
through (c) of this section. You must also provide the performance
testing facilities, as specified in paragraph (d) of this section.
    (a) Notification of performance test. You must notify the
Administrator of your intention to conduct a performance test, as
specified in Sec.  65.884(a).
    (b) Performance test plan. Before conducting a required performance
test, you must develop and submit a performance test plan to the
Administrator for approval. The test plan must include a test program
summary, the test schedule, data quality objectives and both an
internal and external quality assurance program. Data quality
objectives are the pretest expectations of precision, accuracy and
completeness of data, as specified in paragraphs (b)(1) through (4) of
this section.
    (1) The internal quality assurance program must include, at a
minimum, the activities planned by routine operators and analysts to
provide an assessment of test data bias and precision; an example of
internal quality assurance to measure precision is the sampling and
analysis of replicate samples.
    (2) You must perform a test method performance audit during the
performance test, as specified in Sec.  60.8(g), Sec.  61.13(e), or
Sec.  63.7(c)(2)(iii) of this chapter.
    (3) You must submit the performance test plan to the Administrator
at least 60 calendar days before the performance test is scheduled to
take place, that is, simultaneously with the notification of intention
to conduct a performance test required under paragraph (a) of this
section, or on a mutually agreed upon date.
    (4) The Administrator may request additional relevant information
after the submittal of a performance test plan.
    (5) If you would like to use an alternative test method or a change
to a test method, you must follow the requirements of Sec.  65.250,
except for minor test method changes. You may propose minor test method
changes in your performance test plan. Approval of the test plan is
approval of any minor test method changes included in the test plan.
    (c) Approval of performance test plan.
    (1) The Administrator will notify you of approval or intention to
deny approval of the performance test plan within 30 calendar days
after receipt of the original plan and within 30 calendar days after
receipt of any supplementary information that is submitted under
paragraph (c)(1)(ii) of this section. An intention to disapprove the
plan will include the information provided in (c)(1)(i) and (ii) of
this section and will be provided to you before the Administrator
disapproves a performance test plan.
    (i) Notice of the information and findings on which the intended
disapproval is based.
    (ii) Notice of opportunity for you to present, within 30 calendar
days after you have been notified of the intended disapproval,
additional information to the Administrator before final action on the
plan.
    (2) If the Administrator does not approve or disapprove the
performance test plan within the time period specified in paragraph
(c)(1) of this section, then you must conduct the performance test
within the time specified in this subpart using the specified method(s)
and any minor changes to the test methods proposed in the test plan.
    (d) Performance testing facilities. If required to do performance
testing, you must provide performance testing facilities, as specified
in paragraphs (d)(1) through (5) of this section.
    (1) Sampling ports adequate for the applicable test methods,
including meeting the provisions of paragraphs (d)(1)(i) and (ii) of
this section, as applicable.
    (i) Constructing the air pollution control system such that
volumetric flow rates and pollutant emission rates can be accurately
determined by applicable test methods and procedures; and
    (ii) Providing a stack or duct free of cyclonic flow during
performance tests, as demonstrated by applicable test methods and
procedures.
    (2) Safe sampling platform(s).
    (3) Safe access to sampling platform(s).
    (4) Utilities for sampling and testing equipment.
    (5) Any other facilities that the Administrator deems necessary for
safe and adequate testing of a source.

Sec.  65.821  At what process conditions must I conduct performance
testing?

    You must conduct performance tests under the conditions specified
in paragraphs (a) through (d) of this section, as applicable, unless
the Administrator specifies or approves alternate operating conditions.
Upon request, you must make available to the Administrator such records
as may be

necessary to determine the conditions of performance tests performed,
pursuant to this section.
    (a) Continuous process operations. For continuous process
operations, you must conduct all performance tests at maximum
representative operating conditions for the process.
    (b) Batch process operations. For batch process operations, testing
must be conducted at absolute worst-case conditions or hypothetical
worst-case conditions, as specified in Sec.  65.822.
    (c) Combination of both continuous and batch unit operations. For
combined continuous and batch process operations, you must conduct
performance tests when the batch process operations are operating at
absolute worst-case conditions or hypothetical worst-case conditions,
as specified in paragraph (b) of this section, and the continuous
process operations are operating at maximum representative operating
conditions for the process, as specified in paragraph (a) of this
section.
    (d) You must not conduct a performance test during startup,
shutdown, periods when the control device is bypassed or periods when
the process, monitoring equipment or control device is not operating
properly.

Sec.  65.822  At what process conditions must I conduct performance
testing for batch process operations?

    If you choose to conduct testing at absolute worst-case conditions
for batch process operations, you must characterize the conditions by
the criteria presented in paragraph (a) of this section. If you choose
to conduct testing at hypothetical worst-case conditions for batch
process operations, you must characterize the conditions by the
criteria presented in paragraph (b) of this section. In all cases, a
performance test plan must be submitted to the Administrator for
approval prior to testing in accordance with Sec.  65.820(a) through
(d). The performance test plan must include the emission profile
described in paragraph (c) of this section.
    (a) Absolute worst-case conditions. You must consider all relevant
factors, including load and compound-specific characteristics, in
defining absolute worst-case conditions. Absolute worst-case conditions
are defined by the criteria presented in paragraph (a)(1) or (2) of
this section if the maximum load is the most challenging condition for
the control device. Otherwise, absolute worst-case conditions are
defined by paragraph (a)(3) of this section.
    (1) The period in which the inlet to the control device will
contain the maximum projected regulated material load and will always
contain at least 50 percent of the maximum regulated material load (in
pounds) capable of being vented to the control device over any 8-hour
period. An emission profile, as described in paragraph (c)(1) of this
section, must be used to identify the 8-hour period that includes the
maximum projected regulated material load.
    (2) A 1-hour period of time in which the inlet to the control
device will contain the highest regulated material mass loading rate,
in lb/hr, capable of being vented to the control device. An emission
profile, as described in paragraph (c)(1) of this section, must be used
to identify the 1-hour period of maximum regulated material loading.
    (3) The period of time when the regulated material loading or
stream composition (including non-regulated material) is most
challenging for the control device. These conditions include, but are
not limited to, paragraphs (a)(3)(i) through (iii) of this section.
    (i) Periods when the stream contains the highest combined regulated
material load, in lb/hr, described by the emission profiles in
paragraph (c) of this section.
    (ii) Periods when the stream contains regulated material
constituents that approach limits of solubility for scrubbing media.
    (iii) Periods when the stream contains regulated material
constituents that approach limits of adsorptivity for adsorption
systems.
    (b) Hypothetical worst-case conditions. Hypothetical worst-case
conditions are simulated test conditions that, at a minimum, contain
the highest hourly regulated material load of emissions that would be
predicted to be vented to the control device from the emissions profile
described in paragraphs (c)(2) or (3) of this section.
    (c) 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 is an
analysis of regulated material emissions versus time and must be
developed, based on any one of the procedures described in paragraphs
(c)(1) through (3) of this section.
    (1) Emission profile by process. The emission profile by process
must consider all emission episodes (for example, but not limited to,
vessel filling, empty vessel purging, gas sweep of a partially filled
vessel, vacuum operations, gas evolution, depressurization, heating and
evaporation) 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 emission profile by
process must describe the regulated material 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.  65.835(b).
    (2) Emission profile by process equipment. The emission profile by
process equipment must consist of emissions that meet or exceed the
highest emissions, in lb/hr, that would be expected under actual
processing conditions. The emission profile by process equipment must
describe component configurations used to generate the emission events,
volatility of materials processed in the process 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 process equipment in the process(es) or only selected process
equipment.
    (3) Emission profile by capture and control device limitation. The
emission profile by capture and control device must consider the
capture and control system limitations and the highest emissions, in
lb/hr, that can be routed to the control device, based on maximum flow
rate and concentrations possible because of limitations on conveyance
and control components (e.g., fans and lower explosive level alarms).

Sec.  65.823  How do I sample from vent streams?

    You must conduct the applicable sampling, as specified in
paragraphs (a) through (d) of this section.
    (a) You must use Method 1 or 1A at 40 CFR part 60, appendix A-1, as
appropriate, to select the sampling sites.
    (1) For determination of compliance with a percent reduction
requirement of regulated material or total organic compounds, sampling
sites must be located at the outlet of the control device, and with the
exception noted in Sec.  65.724(b)(2), the control device inlet
sampling site must be located at the exit from the unit operation
before any control device.
    (2) For determining compliance with a ppmv total regulated material
or total organic compounds emissions limit in a referencing subpart,
the sampling site

must be located at the outlet of the control device.
    (3) For determining compliance with an emission limit requirement
of a vent stream halogen atom mass emission rate prior to a combustion
device, or to demonstrate that a vent stream is not halogenated,
pursuant to Sec.  65.702(c), collect samples prior to the combustion
device.
    (b) For determining compliance with percent reduction emission
limits, you must collect samples simultaneously at the inlet and outlet
of the control device during the performance test.
    (c) For correcting concentrations to specified percent oxygen, the
sampling site for the measurement of oxygen concentration must be the
same as that of the regulated material samples, and the samples must be
taken concurrently.
    (d) For each test run, you must take either real-time measurements,
an integrated sample or a minimum of four grab samples per hour. If
grab sampling is used, then the samples must be taken at approximately
equal intervals in time, such as 15-minute intervals during the run.

Sec.  65.824  What is the performance test duration?

    (a) Except as provided in paragraph (c) of this section, for
continuous process operations, a performance test must consist of three
runs of at least 1 hour in length; and must be conducted under the
conditions specified in Sec.  65.821(a).
    (b) Except as provided in paragraph (c) of this section, for batch
process operations, a performance test must consist of three runs; and
must be conducted under the conditions specified in Sec.  65.821(b).
Each run must occur over the same absolute or hypothetical worst-case
conditions, as defined in Sec.  65.822, and be tested over the length
of the episode, at a minimum of 1 hour and not to exceed 8 hours.
    (c) For control devices used to control emissions from transfer
racks (except low throughput transfer racks that are capable of
continuous vapor processing, but do not handle continuous emissions or
multiple loading arms of a transfer rack that load simultaneously),
each run must represent at least one complete tank truck or tank car
loading period, during which regulated materials are loaded.

Sec.  65.825  What performance test methods do I use?

    You must conduct the performance test using the applicable test
methods and procedures specified in Table 5 to this subpart and
paragraphs (a) through (e) of this section, as applicable, unless you
request an alternative test method or a change to a test method, as
specified in Sec.  65.250.
    (a) If you use ASTM D6420-99(2010), ``Standard Test Method for
Determination of Gaseous Organic Compounds by Direct Interface Gas
Chromatography-Mass Spectrometry'' (incorporated by reference, see
Sec.  65.265) in lieu of Method 18 at 40 CFR part 60, appendix A-6 or
Method 320 at 40 CFR part 63, appendix A to measure specific organic
regulated material compound concentration, as applicable, at the inlet
and/or outlet of a control device, then you must meet the conditions
specified in paragraphs (a)(1) through (3) of this section.
    (1) The target compound(s) must be listed in Section 1.1 of ASTM
D6420-99 (2010), ``Standard Test Method for Determination of Gaseous
Organic Compounds by Direct Interface Gas Chromatography-Mass
Spectrometry'' (incorporated by reference, see Sec.  65.265), and the
target concentration is between 150 parts per billion by volume and 100
ppmv.
    (2) If one (or more) target compound(s) is not listed in Section
1.1 of ASTM D6420-99 (2010), ``Standard Test Method for Determination
of Gaseous Organic Compounds by Direct Interface Gas Chromatography-
Mass Spectrometry'' (incorporated by reference, see Sec.  65.265), but
is potentially detected by mass spectrometry, an additional system
continuing calibration check after each run, as detailed in Section
10.5.3 of ASTM D6420-99, must be followed, met, documented and
submitted with the performance test report, even if a moisture
condenser is not used or the compound is not considered soluble.
    (3) A minimum of one sample/analysis cycle must completed at least
every 15 minutes.
    (b) If using Method 25A at 40 CFR part 60, appendix A-7 to
determine compliance with a total organic compounds outlet
concentration or percent reduction limit specified in a referencing
subpart, you must follow the procedures in paragraphs (b)(1) through
(3) of this section.
    (1) Calibrate the instrument on propane.
    (2) When demonstrating compliance with an outlet concentration
emission limit specified in the referencing subpart, you must use a
span value of the analyzer between 1.5 and 2.5 times the applicable
emission limit in the referencing subpart. When demonstrating
compliance with a percent reduction by making measurements at the inlet
and outlet of the control device, you must use a span value of the
analyzer of between 1.5 and 2.5 times the highest expected total
organic compounds concentration at each location.
    (3) Report the results as carbon, calculated according to Equation
25A-1 of Method 25A at 40 CFR part 60, appendix A-7.
    (c) If you are using Method 320 at 40 CFR part 63, appendix A,
pursuant to Table 5 to this subpart, you must follow the validation
procedure of section 13.0 of EPA Method 320 unless the validation
procedure was conducted at another source and it can be shown that the
exhaust gas characteristics are similar at both sources. When
demonstrating compliance with an emission limit for hydrogen halides
and halogens, EPA Method 320 may only be used if you can show that
there are no diatomic halogen molecules present in the vent stream
being tested.
    (d) If the uncontrolled or inlet gas stream to the control device
contains formaldehyde, you must conduct emissions testing according to
paragraph (d)(1) or (2) of this section.
    (1) If you elect to comply with a percent reduction requirement and
formaldehyde is the principal regulated material compound (i.e., the
highest concentration for any regulated compound in the stream by
volume), you must use Method 320 at 40 CFR part 63, appendix A, to
measure formaldehyde at the inlet and outlet of the control device,
unless the vent stream being tested has entrained water droplets. If
the vent stream contains entrained water droplets, you must use EPA
Method 316 instead of EPA Method 320 to measure formaldehyde
concentration. Use the percent reduction in formaldehyde as a surrogate
for the percent reduction in total regulated material emissions.
    (2) If you elect to comply with an outlet total organic regulated
material concentration or total organic compounds concentration limit,
and the uncontrolled or inlet gas stream to the control device contains
greater than 10 percent (by volume) formaldehyde, you must use Method
320 at 40 CFR part 63, appendix A, to determine the formaldehyde
concentration, unless the vent stream being tested has entrained water
droplets. If the vent stream contains entrained water droplets, you
must use EPA Method 316 instead of EPA Method 320 to measure
formaldehyde concentration. Calculate the total organic regulated
material concentration or total organic compounds concentration by
totaling the formaldehyde emissions measured using EPA Method 316 or
EPA Method 320 and the other regulated material

compound emissions measured using Method 18 at 40 CFR part 60, appendix
A-6, Method 25A at 40 CFR part 60, appendix A-7, EPA Method 320 or ASTM
D6420-99(2010), ``Standard Test Method for Determination of Gaseous
Organic Compounds by Direct Interface Gas Chromatography-Mass
Spectrometry'' (incorporated by reference, see Sec.  65.265).
    (e) If the uncontrolled or inlet gas stream to the control device
contains carbon disulfide, you must conduct emissions testing according
to paragraph (e)(1) or (2) of this section.
    (1) If you elect to comply with a percent reduction requirement and
carbon disulfide is the principal regulated material compound (i.e.,
the highest concentration for any regulated compound in the stream by
volume), you must use Method 18 at 40 CFR part 60, appendix A-6 or
Method 15 at 40 CFR part 60, appendix A-5, to measure carbon disulfide
at the inlet and outlet of the control device. Use the percent
reduction in carbon disulfide as a surrogate for the percent reduction
in total regulated material emissions.
    (2) If you elect to comply with an outlet total organic regulated
material concentration or total organic compounds concentration limit,
and the uncontrolled or inlet gas stream to the control device contains
greater than 10 percent (by volume) carbon disulfide, you must use
Method 18 at 40 CFR part 60, appendix A-6 or Method 15 at 40 CFR part
60, appendix A-5, to determine the carbon disulfide concentration.
Calculate the total organic regulated material concentration or total
organic compounds concentration by totaling the carbon disulfide
emissions measured using Method 15 at 40 CFR part 60, appendix A-5 or
Method 18 at 40 CFR part 60, appendix A-6 and the other regulated
material compound emissions measured using Method 18 at 40 CFR part 60,
appendix A-6, or Method 25A at 40 CFR part 60, appendix A-7, Method 320
at 40 CFR part 63, appendix A or ASTM D6420-99(2010), ``Standard Test
Method for Determination of Gaseous Organic Compounds by Direct
Interface Gas Chromatography-Mass Spectrometry'' (incorporated by
reference, see Sec.  65.265), as applicable.
    (f) You must not use Method 26 at 40 CFR part 60, appendix A-8, to
test gas streams with entrained water droplets.

Sec.  65.826  How do I calculate emissions in parts per million by
volume concentration?

    Use the procedures specified in paragraph (a) of this section to
calculate ppmv concentration. The calculated concentration must be
corrected to a standard percent oxygen, if required by the referencing
subpart, using the procedures specified in paragraph (b) of this
section.
    (a) Concentration calculation. The concentration of either total
organic compounds (minus methane or ethane) or total organic regulated
material must be calculated according to paragraph (a)(1) or (2) of
this section.
    (1) The total organic compounds concentration (CTOC) is the sum of
the concentrations of the individual components and must be computed
for each run using Equation 2 of this section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.139

Where:

CTOC = Concentration of total organic compounds (minus
methane and ethane), dry basis, ppmv.
x = Number of samples in the sample run.
n = Number of components in the sample.
Cji = Concentration of sample component j (where j is not
methane or ethane) of sample i, dry basis, ppmv.

    (2) You must compute the total organic regulated material (CREG)
according to Equation 2 of this section except that you need only sum
the regulated species.
    (b) Concentration correction calculation. If a referencing subpart
requires the concentration of total organic compounds or organic
regulated material to be corrected to standard oxygen, the correction
must be made, as specified in paragraph (b)(1) of this section. For
batch process operations, you must correct the concentration for
supplemental gases, as specified in paragraph (b)(2) of this section.
    (1) Determine the concentration corrected to a standard percent
oxygen (Cc) specified by the referencing subpart, using Equation 3 of
this section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.140

Where:

Cc = Concentration of total organic compounds or organic
regulated material corrected to a standard percent oxygen, dry
basis, ppmv.
CTOC = Concentration of total organic compounds (minus
methane and ethane) or organic regulated material, dry basis, ppmv.
%O2s = Concentration of oxygen specified by the
referencing subpart, percentage by volume.
%O2d = Measured concentration of oxygen, dry basis,
percentage by volume.

    (2) For batch process operations, correct the measured
concentration for any supplemental gases using Equation 4 of this
section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.141

Where:

Ca = Corrected outlet concentration of regulated
material, dry basis, ppmv.
Cm = Actual concentration of regulated material 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, cubic meters per
minute.
Qs = Total volumetric flow rate of supplemental gases,
cubic meters per minute.

Sec.  65.827  How do I demonstrate compliance with a percent reduction
requirement?

    (a) To demonstrate compliance with a percent reduction requirement
for a control device specified in a referencing subpart, you must
comply with Sec.  65.828.
    (b) To meet a process aggregated percent reduction emission
requirement specified in a referencing subpart for a batch process, you
must follow the provisions, as specified in Sec.  65.835.
    (c) For combined streams of continuous and batch process operations
subject to a process aggregated percent reduction emission requirement
in a referencing subpart, you must demonstrate that the control device
meets the percent reduction requirements for both batch and continuous
process operations by following the provisions specified in Sec. Sec.
65.828 and 65.835.

Sec.  65.828  How do I determine percent reduction?

    To determine a percent reduction for a control device, you must use
the procedures specified in paragraphs (a) and (b) of this section. For
small boilers and process heaters, you must follow the provisions of
Sec.  65.724(b)(1) and (2).
    (a) Mass rate of total organic compounds or regulated material.
Compute the mass rate of either total organic compounds (minus methane
and ethane) or regulated material (Ei, Eo), as
applicable. Use Equations 5 and 6 of this section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.142

Where:

Ei, Eo = Emission rate of total organic
compounds (minus methane and ethane) or emission rate of regulated
material in the sample at the inlet and outlet of the control
device, respectively, dry basis, kilogram per hour.
K2 = Constant, 2.494 x 10-6 (ppmv)-1 (g-mol
per standard cubic meter) (kilogram per gram) (minute per hour),
where standard temperature is 20 degrees Celsius (68 degrees
Fahrenheit).
N = Number of compounds in the sample.
Cij, Coj = Concentration on a dry basis of
organic compound j (where j is not methane or ethane) in ppmv of the
gas stream at the inlet and outlet of the control device,
respectively. If the total organic compounds emission rate is being
calculated, Cij and Coj include all organic
compounds measured minus methane and ethane; if the regulated
material emissions rate is being calculated, all organic regulated
material are included.
Mij, Moj = Molecular weight of compound j,
gram per g-mol, of the gas stream at the inlet and outlet of the
control device, respectively.
Qi, Qo = Vent stream flow rate, dry standard
cubic meter per minute, at a temperature of 20 degrees Celsius (68
degrees Fahrenheit), at the inlet and outlet of the control device,
respectively.

    (b) Percent reduction in total organic compounds or regulated
material. Determine the percent reduction in total organic compounds
(minus methane and ethane) or regulated material using Equation 7 of
this section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.143

Where:

R = Control efficiency of control device, percent.
Ei = Mass rate of total organic compounds (minus methane
and ethane) or regulated material at the inlet to the control device
as calculated under paragraph (a) of this section, kilograms total
organic compounds per hour or kilograms regulated material per hour.
Eo = Mass rate of total organic compounds (minus methane
and ethane) or regulated material at the outlet of the control
device, as calculated under paragraph (a) of this section, kilograms
total organic compounds per hour or kilograms regulated material per
hour.

Sec.  65.829  How do I demonstrate compliance with a hydrogen halide
and halogen emission limit specified in a referencing subpart?

    You must conduct a performance test, pursuant to Sec.  65.820, and
follow the procedures in paragraphs (a) through (d) of this section, as
applicable, when determining compliance with a hydrogen halide and
halogen emission limit specified in a referencing subpart.
    (a) To determine compliance with a halogen atom mass emission rate
emission limit requirement, you must use Equation 8 of this section to
calculate the mass emission rate of halogen atoms:

[GRAPHIC] [TIFF OMITTED] TP26MR12.144

Where:

E = Mass of halogen atoms, dry basis, kilogram per hour.
K2 = Constant, 2.494 x 10-6(ppmv)-1
(g-mol per standard cubic meter) (kilogram per gram) (minute per
hour), where standard temperature is 20 degrees Celsius (68 degrees
Fahrenheit).
Q = Flow rate of gas stream, dry standard cubic meters per minute,
determined according to an engineering assessment, as specified in
Sec.  65.830 or, pursuant to Table 5 to this subpart.
n = Number of halogenated compounds j in the gas stream.
m = Number of different halogens i in each compound j of the gas
stream.
j = Halogenated compound in the gas stream.
i = Halogen atom in compound j of the gas stream.
Cj = Concentration of halogenated compound j in the gas
stream, dry basis, ppmv.
Lji = Number of atoms of halogen i in compound j of the
gas stream.
Mji = Molecular weight of halogen atom i in compound j of
the gas stream, kilogram per kilogram-mol.

    (b) Calculate the mass emissions rate of each hydrogen halide and
halogen compound as the summation of the measured concentrations and
the gas stream flow rate, as shown in Equations 9 and 10 of this
section. To determine compliance with an outlet mass emission rate
limit specified in a referencing subpart, only Equation 10 is required.
[GRAPHIC] [TIFF OMITTED] TP26MR12.145

Where:

Ei, Eo = Total mass rate of hydrogen halide
and halogen compounds, in kilograms per hour.
K = 6 x 10-5, Conversion factor of milligrams per minute to
kilograms per hour.
Cij, Coj = Concentration of each hydrogen
halide and halogen compound in the gas stream, in milligrams per dry
standard cubic meter at the inlet and outlet of the control device,
respectively.
Qi, Qo = Vent stream flow rate, dry standard
cubic meter per minute, at a temperature of 20 degrees Celsius (68
degrees Fahrenheit), at the inlet and outlet of the control device,
respectively.

    (c) Calculate the percent reduction of hydrogen halide and halogen
compounds using the inlet and outlet mass emission rates calculated in
paragraph (b) of this section and Equation 7 of this section.
    (d) To demonstrate compliance with a mass rate (e.g., kilogram per
hour) outlet emission limit, the test results must show that the mass
emission rate of total hydrogen halides and halogens measured at the
outlet of the absorber or other halogen reduction device is below the
mass rate outlet emission limit specified in a referencing subpart.

Sec.  65.830  When can an engineering assessment be used and what does
it include?

    (a) You may conduct an engineering assessment if you perform any of
the actions described in paragraphs (a)(1) through (6) of this section.
    (1) Determine whether a vent stream is halogenated, as specified in
Sec.  65.702(c)(2).
    (2) Supplement your performance test, as specified in Sec.
65.713(a).
    (3) Establish your operating limit on ranges or limits previously
established under a referencing subpart, as specified in Sec.
65.713(d).
    (4) Determine flow rate of a gas stream, as specified in Equation 8
of Sec.  65.829(a).
    (5) Calculate regulated material emissions for each emission
episode that is not described in Section 3 of EPA EIIP Volume II:
Chapter 16 (incorporated by reference, see Sec.  65.265), as specified
in Sec.  65.835(b)(2) or Sec.  65.835(d)(3).
    (6) Calculate regulated material emissions for each emission
episode that you can demonstrate to the Administrator that the emission
estimation techniques in Section 3 of EPA EIIP Volume II: Chapter 16
(incorporated by reference, see Sec.  65.265) are not appropriate, as
specified in Sec.  65.835(e).
    (b) An engineering assessment includes, but is not limited to, the
information specified in paragraphs (b)(1) through (4) of this section.
    (1) Previous test results, provided the tests are representative of
current operating practices at the process unit.
    (2) Bench-scale or pilot-scale test data representative of the
process under representative operating conditions.
    (3) Maximum flow rate, regulated material emission rate,
concentration or other relevant parameter specified or implied within a
permit limit applicable to the vent stream.
    (4) Design analysis, based on accepted chemical engineering
principles, measurable process parameters or physical or chemical laws
or properties. Examples of analytical methods include, but are not
limited to, the methods specified in paragraphs (b)(4)(i) through (iii)
of this section.
    (i) Use of material balances, based on process stoichiometry to
estimate maximum organic regulated material concentrations.
    (ii) Estimation of maximum flow rate, based on physical process
equipment design such as pump or blower capacities.
    (iii) Estimation of regulated material concentrations, based on
saturation conditions.

Batch Emission Calculations

Sec.  65.835  What emissions calculations must I use for batch process
operations for purposes of compliance with an aggregated percent
reduction?

    (a) General. To demonstrate compliance with a process aggregated
percent reduction emission limit in a referencing subpart for batch
process operations, including batch process operations in combined
streams of continuous and batch unit operations, you must compare the
sums of the controlled and uncontrolled emissions for the batch vent
streams subject to control within the process, and show that the
specified reduction is met. The emission reduction must be calculated
as shown in Equation 11 of this section using parameters from Equations
12 and 13 of this section.

[GRAPHIC] [TIFF OMITTED] TP26MR12.146

Where:

Eu = Uncontrolled emissions for batch vent streams.
Ec = Controlled emissions for batch vent streams.
Ei = Uncontrolled emissions for each emission episode, as
determined, pursuant to Sec.  65.835(b).
i = Each emission episode that applies to the batch process (for
example, but not limited to, vessel filling, empty vessel purging,
gas sweep of a partially filled vessel, vacuum operations, gas
evolution, depressurization, heating and evaporation).
Di = Controlled emissions for each emission episode from
a condenser, as determined, pursuant to paragraph (d) of this
section.
Zi = Emission percent reduction for a control device
other than a condenser used during an emission episode (i), as
determined, pursuant to Sec.  65.828.

    (b) Uncontrolled emissions. You must calculate uncontrolled
emissions from all process equipment according to the procedures
described in paragraphs (b)(1) and (2) of this section to demonstrate
initial compliance with a percent reduction emission limit in a
referencing subpart for batch process operations, including operations
in combined streams of continuous and batch unit operations. You must
also use these procedures if you choose to develop an emission profile
by process, as specified in Sec.  65.822(c)(1).
    (1) Except as provided in paragraph (e) of this section, you must
determine uncontrolled emissions of regulated material using
measurements and/or calculations for each batch emission episode within
each unit operation using the emission estimation techniques described
in Section 3 of EPA EIIP Volume II: Chapter 16 (incorporated by
reference, see Sec.  65.265). Chemical property data can be obtained
from standard reference texts.
    (2) You must conduct an engineering assessment according to Sec.
65.830 in order to calculate uncontrolled regulated material emissions
for each emission episode that is not described in Section 3 of EPA
EIIP Volume II: Chapter 16 (incorporated by reference, see Sec.
65.265). You may also conduct an engineering assessment according to
Sec.  65.830 if you meet the requirements of paragraphs (d)(3) or (e)
of this section. Data or other information supporting a finding that
the emissions estimation equations are inappropriate are subject to
preapproval by the Administrator and must be reported in the batch pre-
compliance report.
    (c) Controlled emissions. Except as provided in paragraph (d) of
this section, you must calculate controlled emissions using the percent
reduction for the control device, as determined from the performance
test required in Sec.  65.828 to demonstrate initial compliance with a
percent reduction emission limit in a referencing subpart for batch
process operations, including batch process operations in combined
streams of continuous and batch unit operations.
    (d) Controlled emissions from condensers. For a condenser used as
control, you may calculate controlled emissions from the condenser
using the procedures specified in paragraphs (d)(1) through (4) of this
section to demonstrate initial compliance with a percent reduction
emission limit in a referencing subpart for batch process operations,
including batch process operations in combined streams of continuous
and batch unit operations.
    (1) Except as provided in paragraph (d)(2) of this section, you
must determine controlled emissions from the condenser using
calculations for each batch emission episode within each unit operation
according to the emission estimation techniques described in Section 3
of EPA EIIP Volume II: Chapter 16 (incorporated by reference, see Sec.
65.265). You must use the temperature and regulated material partial
pressures that are determined at the exit temperature and exit pressure
conditions of the condenser. Chemical property data can be obtained
from standard reference texts.
    (2) For heating and depressurization episodes, you must determine
controlled emissions from the condenser using the procedures, as
specified in paragraphs (d)(2)(i) through (iii) of this section.
    (i) You must determine the average molecular weight of regulated
material in vapor exiting the receiver using Equation 14 of this
section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.147

Where:

MWRM = Average molecular weight of regulated material in
vapor exiting the receiver.
(Pi)T1 = Partial pressure of each regulated
material in the vessel headspace at initial temperature of the
receiver.
(Pi)T2 = Partial pressure of each regulated
material in the vessel headspace at final temperature of the
receiver.
MWi = Molecular weight of the individual regulated
material.
n = Number of regulated material compounds in the emission stream.
i = Identifier for a regulated material compound.

    (ii) You must determine the number of moles of non-condensable gas
displaced from the vessel using Equation 15 of this section for heating
episodes; and Equation 16 of this section for depressurization
episodes, as applicable.
[GRAPHIC] [TIFF OMITTED] TP26MR12.148

Where:

[Delta][eta] = Number of moles of non-condensable gas displaced from
the vessel being heated or depressurized.
V = Volume of free space in the vessel being heated or
depressurized.
R = Ideal gas law constant.
Pnc1 = Initial partial pressure of the non-condensable
gas in the headspace of the vessel being heated or depressurized.
Pnc2 = Final partial pressure of the non-condensable gas
in the headspace of the vessel being heated or depressurized.
T1 = Initial temperature of the vessel contents being
heated.
T2 = Final temperature of the vessel contents being
heated.
T = Exit temperature of the receiver.

    (iii) You must determine the mass of regulated material emitted
from the receiver due to the vessel being heated or depressurized using
Equation 17 of this section.
[GRAPHIC] [TIFF OMITTED] TP26MR12.149

Where: