[Federal Register Volume 79, Number 223 (Wednesday, November 19, 2014)]
[Rules and Regulations]
[Pages 68777-68795]
[FR Doc No: 2014-27125]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 60 and 63

[EPA-HQ-OAR-2009-0234; EPA-HQ-OAR-2011-0044; FRL-9919-29-OAR]
RIN 2060-AS07

Reconsideration of Certain Startup/Shutdown Issues: National
Emission Standards for Hazardous Air Pollutants From Coal- and Oil-
Fired Electric Utility Steam Generating Units and Standards of
Performance for Fossil-Fuel-Fired Electric Utility, Industrial-
Commercial-Institutional, and Small Industrial-Commercial-Institutional
Steam Generating Units

AGENCY: Environmental Protection Agency.

ACTION: Final rule; notice of final action on reconsideration.

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SUMMARY: The Environmental Protection Agency (EPA) is taking final
action on its reconsideration of the startup and shutdown provisions in
the final rules titled, ``National Emission Standards for Hazardous Air
Pollutants from Coal- and Oil-fired Electric Utility Steam Generating
Units and Standards of Performance for Fossil-Fuel-Fired Electric
Utility, Industrial-Commercial-Institutional, and Small Industrial-
Commercial-Institutional Steam Generating Units.'' The national
emission standards for hazardous air pollutants (NESHAP) issued
pursuant to Clean Air Act (CAA) section 112 are referred to as the
Mercury and Air Toxics Standards (MATS), and the new source performance
standards (NSPS) issued pursuant to CAA section 111 are referred to as
the Utility NSPS.
    On November 30, 2012, the U.S. Environmental Protection Agency
(EPA) granted reconsideration of, proposed, and requested comment on a
limited set of issues in the February 16, 2012, final MATS and Utility
NSPS, including certain issues related to the final work practice
standards applicable during startup periods and shutdown periods. On
June 25, 2013, the EPA reopened the public comment period for the
reconsideration issues related to the startup and shutdown provisions
of MATS and the startup and shutdown provisions related to the
particulate matter (PM) standard in the Utility NSPS. The EPA is now
taking final action on the standards applicable during startup periods
and shutdown periods in MATS and on startup and shutdown provisions
related to the PM standard in the Utility NSPS.

DATES: The effective date of the rule is November 19, 2014.

ADDRESSES: Docket. The EPA established two dockets for this action:
Docket ID No. EPA-HQ-OAR-2011-0044 (NSPS action) and Docket ID No. EPA-
HQ-OAR-2009-0234 (MATS NESHAP action). All documents in the dockets are
listed in the http://www.regulations.gov index. Although listed in the
index, some information is not publicly available (e.g., confidential
business information (CBI) or other information whose disclosure is
restricted by statute). Certain other material, such as copyrighted
material, will be publicly available only in hard copy form. Publicly
available docket materials are available either electronically in
http://www.regulations.gov or in hard copy at the EPA Docket Center,
Room 3334, 1301 Constitution Avenue NW., Washington, DC. The Public
Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through
Friday, excluding legal holidays. The telephone number for the Public
Reading Room is<PHONE_NUMBER>, and the telephone number for the Air
Docket is<PHONE_NUMBER>.

FOR FURTHER INFORMATION CONTACT: For the MATS NESHAP action: Mr.
William Maxwell, Energy Strategies Group, Sector Policies and Programs
Division (D243-01), Office of Air Quality Planning and Standards, U.S.
Environmental Protection Agency, Research Triangle Park, North Carolina
27711; Telephone number:<PHONE_NUMBER>; Fax number<PHONE_NUMBER>;
Email address<EMAIL_ADDRESS>For the NSPS action: Mr. Christian
Fellner, Energy Strategies Group, Sector Policies and Programs Division
(D243-01), Office of Air Quality Planning and Standards, U.S.
Environmental Protection Agency, Research Triangle Park, North Carolina
27711; Telephone number:<PHONE_NUMBER>; Fax number<PHONE_NUMBER>;
Email address<EMAIL_ADDRESS>
SUPPLEMENTARY INFORMATION:
    Outline. The information presented in this preamble is organized as
follows:

I. General Information
    A. Does this action apply to me?
    B. How do I obtain a copy of this document?
    C. Judicial Review
II. Background
III. Summary of This Action
IV. Summary of Final Action and Changes Since Proposal--MATS
Startup/Shutdown Issues
V. Summary of Final Action and Changes Since Proposal--Utility NSPS
VI. Impacts of This Final Rule
    A. Summary of Emissions Impacts, Costs and Benefits
    B. What are the air impacts?
    C. What are the energy impacts?
    D. What are the compliance costs?
    E. What are the economic and employment impacts?
    F. What are the benefits of the final standards?
VII. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review and
Executive Order 13563: Improving Regulation and Regulatory Review
    B. Paperwork Reduction Act
    C. Regulatory Flexibility Act
    D. Unfunded Mandates Reform Act
    E. Executive Order 13132: Federalism
    F. Executive Order 13175: Consultation and Coordination With
Indian Tribal Governments
    G. Executive Order 13045: Protection of Children From
Environmental Health Risks and Safety Risks
    H. Executive Order 13211: Actions That Significantly Affect
Energy Supply, Distribution, or Use
    I. National Technology Transfer and Advancement Act
    J. Executive Order 12898: Federal Actions To Address
Environmental Justice in Minority Populations and Low-Income
Populations
    K. Congressional Review Act

I. General Information

A. Does this action apply to me?

    Categories and entities potentially affected by this action
include:

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                                                 Examples of potentially
            Category             NAICS Code \1\     regulated entities
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Industry.......................          221112  Fossil fuel-fired
                                                  electric utility steam
                                                  generating units.
Federal government.............      \2\ 221122  Fossil fuel-fired
                                                  electric utility steam
                                                  generating units owned
                                                  by the federal
                                                  government.
State/local/tribal government..      \2\ 221122  Fossil fuel-fired
                                                  electric utility steam
                                                  generating units owned
                                                  by municipalities.

                                         921150  Fossil fuel-fired
                                                  electric utility steam
                                                  generating units in
                                                  Indian country.
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\1\ North American Industry Classification System.
\2\ Federal, state, or local government-owned and operated
  establishments are classified according to the activity in which they
  are engaged.

    This table is not intended to be exhaustive, but rather to provide
a guide for readers regarding entities likely to be affected by this
action. To determine whether your facility, company, business,
organization, etc., would be regulated by this action, you should
examine the applicability criteria in 40 CFR 60.40, 60.40Da, or 60.40c
or in 40 CFR 63.9982. If you have any questions regarding the
applicability of this action to a particular entity, consult either the
air permitting authority for the entity or your EPA regional
representative as listed in 40 CFR 60.4 or 40 CFR 63.13 (General
Provisions).

B. How do I obtain a copy of this document?

    In addition to being available in the docket, an electronic copy of
this final rule will be available on the World Wide Web (WWW) through
the Technology Transfer Network (TTN). Following signature, a copy of
the action will be posted on the TTN's policy and guidance page for
newly proposed or promulgated rules at the following address: http://www.epa.gov/ttn/oarpg/. The TTN provides information and technology
exchange in various areas of air pollution control. A copy of this
action will also be available on: www.epa.gov/mats/.

C. Judicial Review

    Under CAA section 307(b)(1), judicial review of this final rule is
available only by filing a petition for review in the U.S. Court of
Appeals for the District of Columbia Circuit by January 20, 2015. Under
CAA section 307(d)(7)(B), only an objection to this final rule that was
raised with reasonable specificity during the period for public comment
can be raised during judicial review. Note, under CAA section
307(b)(2), the requirements established by this final rule may not be
challenged separately in any civil or criminal proceedings brought by
the EPA to enforce these requirements.

II. Background

    On February 16, 2012, the final MATS and the Utility NSPS rules
were published in the Federal Register. 77 FR 9304. Following
promulgation of the final rules, the Administrator received petitions
for reconsideration of various provisions of both MATS and the Utility
NSPS pursuant to CAA section 307(d)(7)(B), including requests to
reconsider the work practice standards applicable during startup
periods and shutdown periods that were included in the final rule.
Copies of the MATS petitions are provided in Docket ID No. EPA-HQ-OAR-
2009-0234. Copies of the Utility NSPS petitions are provided in Docket
ID No. EPA-HQ-OAR-2011-0044. The EPA granted reconsideration of the
startup and shutdown provisions because the agency proposed to require
sources to comply with the numeric standards at all times and did not
propose a work practice standard for startup periods and shutdown
periods; thus, the public was not provided an opportunity to comment on
the work practice requirements contained in the final rule.\1\ On
November 30, 2012, the EPA published a proposed rule reconsidering
certain new source standards issued in MATS and the startup and
shutdown provisions in MATS and the Utility NSPS, among other things.
77 FR 71323. The EPA proposed certain minor changes to the startup and
shutdown provisions contained in the 2012 final rule based on
information obtained in the petitions for reconsideration. On April 24,
2013 (78 FR 24073), the EPA took final action on the new source
standards that were reconsidered and also the technical corrections
contained in the November 30, 2012, proposed action. The EPA did not
take final action on the startup and shutdown provisions, and, on June
25, 2013, the EPA added new information and analysis to the docket and
reopened the public comment period for the proposed revisions to the
startup and shutdown provisions in MATS and the startup and shutdown
provisions related to the PM standard in the Utility NSPS.
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    \1\ The EPA continues to believe that the final existing source
standards contain sufficient variability to include startup periods
and shutdown periods. Furthermore, in light of what we have learned
concerning the performance of the best performing sources during
startup and shutdown (e.g., clean fuel use and efficient engagement
of air pollution control devices (APCDs)), we believe that the best
performing electric utility steam generating units (EGUs) for
startup periods and shutdown periods will have hazardous air
pollutant (HAP) emissions that are lower than the numeric standards,
when averaged over the startup and shutdown period as defined.
However, as explained in the record, the lack of HAP data for these
periods and the current technical challenges to accurately measure
HAP emissions during startup and shutdown cause us to establish a
work practice for such periods.
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III. Summary of This Action

    This final action includes final amendments to the startup and
shutdown provisions of the final MATS and Utility NSPS issued by the
EPA on February 16, 2012. This action does not alter or reopen any
other MATS or Utility NSPS provisions, including those provisions
recently upheld by the U.S. Court of Appeals for the District of
Columbia Circuit (Court) in White Stallion Energy Center v. EPA on
April 15, 2014. 784 F.3d 1222 (D.C. Cir. 2014). The February 2012 final
rule is and remains in effect for all sources, and existing sources
must comply with the final rule by April 16, 2015, or seek an extension
of that compliance date from the appropriate title V permitting
authority.
    The November 30, 2012, proposed reconsideration rule reopened,
among other things: (1) The requirements applicable during startup
periods and shutdown periods in MATS, and (2) the startup and shutdown
provisions related to the PM standard in the Utility NSPS. We are
taking final action today on the requirements for startup periods and
shutdown periods contained in 40 CFR Part 63, subpart UUUUU, and 40 CFR
Part 60, subpart Da.
    As noted above, in the proposed reconsideration rule, the EPA
proposed revisions to, and took comment on, the definitions of
``startup'' and ``shutdown'' and the work practice requirements
associated with those periods in the final MATS rule. The EPA also took
comment on the startup and shutdown provisions relating to the PM
standard in the Utility NSPS. The EPA received a number of comments
regarding the proposed startup and shutdown provisions, including data
and information relevant to the proposed work practice standard that
applies during such periods, and the agency also reviewed EGU nitrogen
oxides (NOX) and sulfur dioxide (SO2) emissions
data generated during startup periods and shutdown periods and
submitted to the EPA pursuant to title IV of the CAA (i.e. the Acid
Rain Program). On June 25, 2013 (78 FR 38001), the EPA reopened the
public comment period on the startup/shutdown provision and solicited
comment on both the public comments

provided in response to the November 30, 2012, proposal, as well as the
startup and shutdown technical support document (TSD) that was based on
the Acid Rain Program data that was made available in the docket.\2\
The agency has reviewed all of the comments received on the startup and
shutdown issues. As described below, the EPA is taking final action on
the startup and shutdown provisions in MATS and the Utility NSPS.
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    \2\ The EPA is still reviewing the other issues raised in the
petitions for reconsideration and is not taking any action at this
time with respect to those issues.
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    Because this final rule is very similar to the February 2012 final
rule, the impacts of these revisions on the costs and the benefits of
the final rule are minor.

IV. Summary of Final Action and Changes Since Proposal--MATS Startup/
Shutdown Issues

    After consideration of the public comments received and other
information, the EPA is finalizing the startup and shutdown provisions
contained in the final MATS rule and we are also finalizing an
alternative compliance option for startup periods and shutdown
periods.\3\ We address several significant comments in this preamble.
For a complete summary of the comments received on the issues we are
finalizing today and our responses thereto, please refer to the
memorandum ``National Emission Standards For Hazardous Air Pollutants
From Coal- And Oil-Fired Electric Utility Steam Generating Units--
Reconsideration Of Certain Startup/Shutdown Issues; Summary Of Public
Comments And Responses'' (RTC) in Docket ID No. EPA-HQ-OAR-2009-0234.
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    \3\ This preamble does not discuss the startup and shutdown
provisions provided in the February 2012 final MATS rule. (See 77 FR
9486, 9493-9494.) We are not altering those provisions in this final
action. However, the critical control requirement (i.e., the
requirement to use clean fuels to start and warm the EGU and
relevant controls prior to coal, residual, or solid oil-derived fuel
combustion, as well as recordkeeping and reporting procedures for
those requirements) is the same for both. We are maintaining the
final rule approach and will evaluate the continued need for the
alternative definition during our ongoing 8-year reviews. We intend
to use HAP and HAP surrogate data collected during periods of
startup and periods of shutdown to evaluate the accuracy of CEMS
from the start of electricity generation to the end of startup as
defined under the alternative included in this final rule (i.e., 4
hours after electricity generation). We will use these data to help
determine whether it is appropriate to make changes to the rule in
the future.
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    As discussed in more detail below, the alternative work practice
standard for startup periods and shutdown periods requires coal- and
oil-fired EGUs to initiate startup using only clean fuels and to
continue combusting the maximum amount of clean fuels possible at the
facility throughout the entire startup period. EGUs that chose to
comply with the alternative work practice will be required to have
sufficient clean fuel capacity to startup and warm the facility to the
point where the primary PM controls (e.g., fabric filters (FFs) and
electrostatic precipitators (ESPs)) can be brought on line at the same
time as, or within 1 hour of, the addition of the primary fuel (i.e.,
coal, residual oil, or solid oil-derived fuel) to the EGU. If a
facility does not have sufficient clean fuel capacity to enable
initiation and operation of the PM controls within 1 hour of addition
of primary fuel, then the source will have to increase its clean fuel
capacity or take other action to comply with the work practice
requirements in this final rule.\4\ The alternate included in this
final rule also requires EGUs to comply with the applicable numeric
standards within 4 hours of the generation of electricity or thermal
energy for use either on site or for sale over the grid (i.e., the end
of startup) and to continue to maximize clean fuel use throughout that
period.
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    \4\ We note that the startup and shutdown provisions contained
in the February 16, 2012, final MATS rule also required EGUs to
maximize clean fuels during startup periods and shutdown periods, as
sources are required to comply with all MATS and NSPS standards at
the time of electricity generation. Therefore, EGUs complying with
the work practice as finalized on February 16, 2012, will
necessarily be required to warm their units on clean fuels alone for
extended periods unless the operators determine that compliance over
the 30-day averaging period can be achieved without certain HAP
controls for a portion of time after the defined startup period. EGU
operators may conclude compliance without controls for a short
period after startup is possible for a number of reasons, including
the variability included in the numeric standards and our
understanding from regulating many HAP categories that sources
generally over-control to ensure a compliance margin is maintained.
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    The EPA has established these final alternative requirements after
determining what the best performing EGUs do during startup periods and
shutdown periods. The EPA used several different metrics to determine
the best performing sources for various aspects of the work practice
requirements and definitions. Specifically, concerning the use of clean
fuels, the comments received and the Acid Rain data in the record
indicate that most EGU operations start using clean fuels and that many
of those EGUs generate electricity while using clean fuels and/or
routinely engage their PM controls before or within 1 hour of beginning
to combust coal, residual oil, or solid oil-derived fuel. The clean
fuels identified by the commenters and included in the final rule are
inherently cleaner from a HAP emissions perspective than coal, residual
oil, or solid oil-derived fuel, and, for this reason, maximizing the
use of clean fuels during startup will greatly limit the emissions of
HAP while EGUs are warming up to temperatures sufficient to engage the
air pollution control devices (APCDs). Thus, we considered those EGUs
that use clean fuels for the longest period of time before the
introduction of coal and the generation of electricity to be the best
performing EGUs because they are likely to have the lowest amount of
HAP emissions during the startup period. In addition, the best
performing EGUs were also determined to be those with the ability to
engage PM control devices at the time (i.e., within 1 hour) of
introduction of primary fuel. Further, we believe all of the concerns
raised by commenters about the ability to engage the PM controls can be
safely resolved to allow compliance with the final work practice, as
explained in the RTC.\5\ We believe it is appropriate to use generation
of electricity as an indicator of startup for two reasons. First, the
information we have indicates that the only reason the owner/operator
of an EGU chooses to fire fuel in a boiler is to generate electricity.
Therefore, any event that starts with firing of fuel in a boiler that
has been shut down will culminate in generation of electricity. Second,
introduction of coal to the boiler is also always associated with
generation of electricity. The TSD and other information confirm our
understanding.
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    \5\ See, e.g., EPA-HQ-OAR-2009-0234-20269, -20275, and -20303.
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    For determining the appropriate time after generation to define the
end of startup (i.e., the time when the numerical standards apply), the
EPA conducted an analysis of continuous emission monitor system (CEMS)
data for NOX and SO2 from EGUs to determine the
range of times after initial generation of electricity or thermal
energy that EGUs typically take to engage and operate all of their
APCDs. The EPA determined the best performing 12 percent of EGUs by
identifying those EGUs that were able to engage their APCDs most
quickly after the initial generation of electricity or thermal energy
and averaged that time to determine the end of the startup period when
the numeric standards would become applicable. Specifically, we
evaluated the average startup period for the best performing 12 percent
of EGUs for which the EPA has the relevant data (i.e., those with the
relevant NOX and/or SO2 controls). We

used 12 percent of the sources with the relevant controls because the
metric upon which the end of startup is based depends on the presence
of the relevant controls, not on the actual NOX and
SO2 emissions. Thus, sources without the relevant controls
cannot be compared against sources with the relevant controls for
purposes of defining the end of startup in this final rule. CAA section
112(d)(3)(A) directs the EPA to establish MACT floor standards based on
the performance on the best performing 12 percent of sources for which
the Administrator has data, and, in this case, the agency does not have
relevant data from all sources in the category. For this reason, it is
reasonable to establish the work practice based on 12 percent of the
sources with the relevant data (i.e., those EGUs with the relevant
NOX or SO2 controls).
    We used this approach to determine the end of startup because it is
reasonable to expect the EGUs that are able to most quickly and
efficiently engage their controls after the generation of electricity
to be the best performing sources and to have the lowest HAP emissions
during and directly after the startup period, and because we are
confident that EGUs will be able to accurately measure HAP emissions
with CEMS at this time. The requirement to maximize the use of clean
fuels (with inherently low HAP emissions) during the startup period
ensures that HAP emissions are minimized during that time. Because EGUs
subject to Acid Rain Program requirements are required to submit
continuous NOX and SO2 data to the EPA, the
agency believes it has data on all startup events from those EGUs
subject to that program, which comprise nearly all EGUs subject to this
rule, for over a decade. Thus, we believe we have a full data set from
which to determine the end of the startup period for the best
performing 12 percent of sources for which we have the relevant
data.\6\ We maintain it is reasonable to use the CAA section 112(d)(3)
metric for establishing MACT floors for existing sources as a starting
point for determining the appropriate work practice when presented with
such comprehensive data. See CAA 112(h)(1) (directing the agency to
establish a work practice standard ``which in the Administrator's
judgment is consistent with the provisions of subsection (d) or (f) of
this section.'').
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    \6\ We note that these data are not reliable for quantifying
emissions for this analysis but, rather, the data allow us to
evaluate when controls are turned on for the purpose of determining
when startup ends.
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    For shutdown periods, the EPA determined that sources could cease
adding coal or oil to the EGU prior to shutting down the APCDs. We
determined that sources able to run their control devices even after
coal or oil is added to the EGU for the last time before shutdown were
the best performing sources because HAP emissions would be minimized as
the EGU combusts the remaining coal or oil in the boiler.
    The final work practice standard, when applied across the industry,
will greatly reduce HAP emissions during startup periods and shutdown
periods. The requirement to maximize clean fuel use throughout the
startup period will significantly limit HAP emissions because of the
inherently low HAP emissions associated with the clean fuels identified
in 40 CFR 63.10042.\7\ In addition, the requirement to engage and
operate PM controls as expeditiously as possible and within 1 hour of
coal, residual oil, or solid oil-derived fuel combustion will limit HAP
emissions that are particulate in nature throughout the remainder of
the startup period. We believe that application of this work practice
will lead to HAP emissions during startup periods and shutdown periods
that are comparable to, and potentially lower than, those levels
authorized during normal operations when averaged over the entire
startup and/or shutdown period. During the 8-year review required under
CAA section 112(d)(6), the agency intends to further assess HAP
emissions during startup and shutdown based on data collected from
sources complying with the final rule, though we recognize that
prospectively our ability to establish numerical standards during
startup periods and shutdown periods will depend, at least in part, on
the further development of testing methodologies that will allow the
agency to accurately measure emissions during those periods with an
acceptable level of certainty.
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    \7\ Natural gas is one of the clean fuels identified in this
final rule and the agency determined in 2000 that it was neither
appropriate nor necessary to regulate natural gas-fired EGUs because
the impacts from HAP emissions from such units are ``negligible.''
See ``Regulatory Finding on the Emissions of Hazardous Air
Pollutants from Electric Utility Steam Generating Units,'' 65 FR
79825, 79831 (December 20, 2000).
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    The specific provisions of the alternative startup and shutdown
requirements and our rationales for those provisions are discussed in
more detail below and in the RTC document in Docket ID No. EPA-HQ-OAR-
2009-0234.

1. Definitions

    In the November 2012 reconsideration proposal, we proposed
revisions to the definitions of startup and shutdown contained in the
final MATS rule and set forth in 40 CFR 63.10042, after receiving
petitions for reconsideration of the startup and shutdown provisions in
the final MATS rule. Petitioners asserted, among other things, that the
final rule's definitions of startup and shutdown were not sufficiently
clear, should accommodate operation of cogeneration units, and did not
accurately reflect startup conditions for all affected units. We
received additional comments on these issues during the public comment
periods. For more discussion of the petitions for reconsideration and
the comments on the definitions in the final rule, see the RTC in
Docket ID No. EPA-HQ-OAR-2009-0234.
    As a result of comments received on the November 2012 proposal and
the June 2013 reopening of the public comment period, we have further
revised the proposed definitions as follows.
    a. Startup. The definition of startup in the November 2012
reconsideration proposed rule was similar to the definition the EPA
finalized in MATS in February 2012. In this final reconsideration rule,
we have maintained the final MATS definition of startup and, in
addition, are finalizing an alternative definition of startup based on
the November 2012 proposal and the analysis in the startup and shutdown
TSD. Sources may choose to use either definition of startup when
complying with the startup and shutdown requirements. We are finalizing
both definitions because we believe that they both meet the
requirements of CAA section 112 to reduce HAP emissions during this
time period and will provide operators with flexibility, even though we
question the ability to accurately measure HAP emissions at the start
of electricity generation. A discussion of the comments and analyses
that led to inclusion of the alternative startup definition is provided
below.
    In the November 2012 reconsideration proposal, the EPA proposed
that startup be defined as the period in which operation of an EGU is
initiated for any purpose. The proposed definition indicated that
startup begins with either the first-ever firing of fuel in an EGU for
the purpose of producing electricity or useful thermal energy (such as
heat or steam) for industrial, commercial, heating, or cooling purposes
or the firing of fuel in an EGU for any purpose after a shutdown event.
The proposed

definition indicated that startup ended when the EGU generates
electricity that is sold or used for any other purpose (including on
site use), or the EGU makes useful thermal energy (such as heat or
steam) for industrial, commercial, heating, or cooling purposes,
whichever is earlier. The agency received comments stating that the
general approach provided in the proposed definition of ``startup''
(particularly the end of startup) was directionally correct but did not
allow sufficient time for the APCDs to become effective and, thus, the
industry was concerned that some EGUs would not be able to achieve the
MATS emission limits finalized in the February 2012 rule at the end of
startup as defined in the final MATS rule. The comments further stated
the opinion that startup did not end with first generation of
electricity or production of steam as the EPA had proposed. Instead,
some comments suggested that the defined end of startup should be
changed to be 4 hours after 25-percent load is first reached or 12
hours after first electricity generation, whichever occurs first. Some
comments stated that even longer time periods were necessary for
certain types of EGUs, that different startup periods should be defined
for different types of EGUs, and that additional consideration should
be given to a wider variety of APCDs. Other comments maintained that
the definition in the final MATS rule was appropriate and indicated
that any extension of time during which the EGUs were not subject to
the final rule's emission limits was not in accordance with CAA section
112.
    The EPA disagrees with the commenters to the extent they maintain
that a work practice is required after emissions can be accurately
measured or that the agency is bound to the time contained in the final
rule where, as here, we conclude that the HAP measurement methodologies
are not capable of accurately measuring HAP emissions during the
defined startup period. The EPA did, however, conduct an additional
technical analysis after its initial review of the comments and in June
2013 published a document reopening the public comment period. The
document specifically requested comment on the additional technical
analysis the EPA had conducted in response to comments received
concerning the end of startup. See ``Assessment of startup period at
coal-fired electric generating units'' (Docket ID No. EPA-HQ-OAR-2009-
0234-20378). In the analysis, the EPA examined several indicators that
allowed the agency to assess the time required to engage APCDs at
affected EGUs. Using these indicators, we found no significant
difference in performance related to startup between the different
groups or types of EGUs assessed in the analysis (e.g., circulating
fluidized bed (CFB), stoker, subcritical, supercritical). We further
indicated that the results of our analysis supported defining the end
of startup at coal- and oil-fired EGUs as occurring at the time to
achieve 25 percent of the EGU's nameplate generating capacity
(megawatts, MW) plus 3 hours, or the start of electricity generation
plus 6 hours, whichever comes first.
    The EPA has reviewed all of the comments received on the proposed
definition of startup in response to these two opportunities for public
comment and has revised the June 2013 analysis. Based on this review,
we are finalizing a revised definition of ``startup'' that uses the
approach outlined in the June 2013 assessment with revisions as
discussed below.
Defining the End of ``Startup''
    The June 2013 analysis suggested a potential end time for startup
of 6 hours after the start of electricity generation or 3 hours after a
coal- or oil-fired EGU reaches 25 percent of nameplate capacity,
whichever occurs first. In other words, 6 hours after the start of
generation or 3 hours after reaching electricity generation equal to 25
percent of nameplate capacity, whichever comes first, an EGU would have
to start monitoring and reporting its emissions for the purpose of
complying with the numeric emissions standards contained in MATS.
    The EPA took this approach because we determined that flue gas
conditions will be adequate to accurately measure HAP emissions with
CEMS 4 hours after the generation of electricity. The approach
evaluated the time for all APCDs to be functioning because we
determined that stack conditions will be stable at this point. The
analysis was based on our review of hourly SO2 and
NOX emissions from CEMS installations from nearly 9,500
distinct startup events at more than 400 coal-fired EGUs, including CFB
boilers, and subcritical and supercritical pulverized coal boilers
equipped with SO2 APCDs (e.g., wet or dry flue gas
desulfurization (FGD)) and/or NOX APCDs (e.g., selective
catalytic reduction (SCR)). The EPA analyzed hourly SO2 and
NOX emissions primarily because changes in SO2
and NOX emissions are reasonable indicators of when APCDs
are operational and stack conditions will be sufficiently stable to
allow for accurate measurement of HAP emissions with CEMS. We also note
that SO2 emissions are a surrogate for acid gases (e.g.,
hydrogen chloride); SO2 APCDs can be used for co-benefit
mercury (Hg) control; and NOX SCR APCDs may increase the
oxidation of Hg, influencing the effectiveness of Hg controls.\8\ The
goal of the analysis was to identify the approximate time it took, on
average, to initiate operation of SO2 and NOX
APCDs because it was those controls (e.g., scrubbers and SCR) that
industry commenters stated required additional time to engage after the
start of generation of electricity or useful thermal energy. The goal
in conducting the analysis was not to determine the time it took for
APCDs at all EGUs to become fully operational, but instead to determine
the average time for the engagement of APCD to determine a reasonable
end of startup.
---------------------------------------------------------------------------

    \8\ The EPA did not include hourly PM data in this analysis
because PM CEMS data are not available and PM CEMS have not yet been
certified to accurately measure during periods of startup and
periods of shutdown as defined in this final rule.
---------------------------------------------------------------------------

    The EPA received detailed comments on the June 2013 analysis and
the proposed rule. Although commenters' opinions varied, the EPA
identified three distinct groups of comments. The first group agreed
with the EPA's approach to define a time limit following the start of
generation, but many commenters suggested that more time was necessary
to safely and/or fully engage APCDs. The second group commented that
CAA section 112 requires the EPA to establish standards based on the
average of the best performing 12 percent of EGUs, not the average of
the fleet. The third group disagreed with the EPA's approach, stating
that many APCDs could not be fully functional within the time limits
specified by the EPA, and citing the need for greater flexibility.
    The EPA evaluated the information provided by commenters and
considered the different approaches to define the end of startup.\9\
After careful consideration and in light of issues raised in comments
and data provided, the EPA has revised its initial approach for
determining the end of startup in

several respects. First, in the June 2013 analysis, we did not attempt
to identify the EGUs that were the best performing sources, but instead
simply looked at a category-wide average time for engagement of APCDs.
As certain commenters noted, the category-wide average may not satisfy
the CAA section 112(h) requirement that the EPA establish work practice
standards ``which in the Administrator's judgment [are] consistent with
the provisions of subsections (d) or (f) of this section [112].'' To
more appropriately track this statutory directive, the EPA revised the
analysis and identified the EGUs that were able to most quickly engage
their APCDs because we determined that the best performing EGUs for
purposes of defining the end of startup are those that are able to most
efficiently engage their controls after the start of electricity
generation. The EPA then averaged the time it took for such EGUs to
bring their APCDs on line to determine a reasonable time after
generation of electricity to define the end of startup. The EPA chose
this approach in the final rule because we believe it most closely
follows the requirements of CAA section 112.
---------------------------------------------------------------------------

    \9\ It is important to remember that the hour at which startup
ends is the hour at which reporting for the purpose of determining
compliance begins. Therefore, EGUs must collect and report emissions
and heat input or generation data following the end of startup.
These data are used in calculating whether an EGU is in compliance
with the 30-day average emission limits. MATS does not mandate that
all APCDs must be fully operational at the end of startup (nor does
it mandate that emissions during any given hour during this period
must be below the 30-day average emission limits); rather, MATS
mandates only that sources comply with the MATS emission standards
at that time.
---------------------------------------------------------------------------

    The EPA analysis of startup events at coal-fired EGUs indicates
that the best performing EGUs can, on average, initiate operation of
their SO2 and NOX APCDs within 4 hours following
the start of generation (see Technical Support Document (TSD) titled
``Assessment of startup period at coal-fired electric generating
units--Revised'' in Docket ID No. EPA-HQ-OAR-2009-0234). In addition,
the Agency is confident that stack conditions at this time are
conducive for accurate measurements of HAP emissions using CEMS. For
these reason, and because SO2 can be used as a surrogate for
the control of acid gases and SO2 and NOX APCDs
can impact the control of Hg emissions, and because we believe based on
comments and other information that SO2 and NOX
controls are generally the last APCDs to be engaged, the EPA has
determined that the end of startup should be defined as the end of the
4th hour following the start of generation of electricity or useful
thermal energy. The agency has also determined that it is not necessary
to include any additional variability because the agency believes it
has information on all of the startup events from the EGUs with the
relevant data so startup time variability is fully represented in the
available data.
    b. Shutdown. The EPA is maintaining the definition of ``shutdown''
proposed in the November 2012 action, and further requiring that all
APCDs must be operated as long as coal, residual oil, or solid oil-
derived fuel is being fired in the EGU and as long thereafter as
possible, considering safety and system integrity.
    The RTC contains a summary of the comments received on this topic
and the EPA's response to those comments.

2. Work Practice Standards and Clean Fuels

    The final work practice for startup periods requires EGUs to
initiate startup using clean fuels and to combust only clean fuels
until primary fuel (e.g., coal, residual oil, or solid oil-derived
fuel) is fed into the EGU, at which time the EGU must engage and
operate its PM controls as soon as possible and no later than 1 hour
thereafter. After engagement of PM controls, EGUs are required to
maintain maximum clean fuel use until the end of startup (i.e., 4 hours
after the start of generation of electricity or useful thermal energy).
The maximization of clean fuel use after addition of primary fuel to
the EGU assures that the least amount of HAP possible will be emitted
from the units during the startup period. The final rule also includes
more fuels on the list of clean fuels that may be combusted during
startup periods and shutdown periods, as discussed below.
    The EPA is finalizing a requirement in the work practice that PM
controls be engaged and operated within 1 hour of coal, residual oil,
or solid oil-derived fuel being fired. In the November 2012 proposal,
the EPA proposed to require that once an EGU starts firing coal,
residual oil, or solid oil-derived fuel, all of the applicable control
devices had to be engaged, with certain listed exceptions. PM-specific
control devices were not included in that list of excepted controls
because the EPA believed that PM controls on EGUs could be engaged
(i.e., operational) at the best performing EGUs at the time the primary
fuel (i.e., coal, residual oil, or solid oil-derived fuel) is fired.
The EPA has reviewed both the record and the comments received, and we
have determined that the EGUs that are able to engage PM controls
(through either use of PM-specific controls (e.g., ESP, FF) or wet FGD
scrubber system alone or in conjunction with PM controls) within 1 hour
following the initiation of firing of coal, residual oil, or solid oil-
derived fuel are the best performing sources for purposes of minimizing
particulate HAP emissions during startup periods.\10\ Therefore, we are
finalizing a requirement that an owner/operator must engage and operate
the PM controls within 1 hour of first firing of coal, residual oil, or
solid oil-derived fuel.
---------------------------------------------------------------------------

    \10\ Docket ID Nos. EPA-HQ-OAR-2009-0234-20269, EPA-HQ-OAR-2009-
0234-20275.
---------------------------------------------------------------------------

    Moreover, in order to demonstrate an EGU's capacity to maximize the
use of clean fuels during startup periods and its ability to bring PM
control devices online in an expeditious manner following first firing
of coal, residual oil, or solid oil-derived fuel, the rule now requires
EGU owners or operators to determine and report each EGU's maximum
storage capacity for clean fuels and maximum capacity for heat input
while combusting clean fuels alone. The rule also requires EGU owners
or operators to identify, record, and report semiannually each instance
of startup or shutdown, specifying the dates and times that clean fuel
use begins and ends; the dates and times that primary (i.e., coal or
oil) fuel use starts or ends; and the hourly clean fuel usage, heat
input, and electrical output.
    In addition, for those non-liquid oil-fired EGUs not using PM CEMS,
HAP metals CEMS, or PM continuous parameter monitoring system (CPMS) as
a compliance determination method or not meeting low emitting EGU (LEE)
status \11\ for PM or non-mercury HAP metals emissions or those liquid
oil-fired EGUs not using PM CEMS or PM CPMS as a compliance
determination method or not meeting LEE status for PM or HAP metals
emissions, parametric monitoring data will be required to help show PM
control device effectiveness upon first use of coal, residual oil, or
solid oil-derived fuel. This type of data is not required from EGUs
using PM CEMS, HAP metals CEMS, or PM CPMS, as those instruments are
already required to provide these data during startup periods; those
data are suitable for assessing how soon and how well PM control
devices are operating. Likewise, once EGUs meet the LEE status for PM
or non-mercury HAP metals emissions for non-liquid oil-fired EGUs (or
HAP metals emissions for liquid oil-fired EGUs), they will no longer
need to supply additional information regarding PM control device
operation during startup periods, for it is reasonable to expect their
PM control devices to be properly sized and operated in order to
demonstrate consistent operation at less than 50 percent of the
emissions limit over a 3-year period. It is also reasonable to expect
that the information recorded and calculated during startup periods and
shutdown periods from LEE-eligible EGUs will show better emissions
performance

when compared to similar information obtained from EGUs without LEE
status.
---------------------------------------------------------------------------

    \11\ See 40 CFR 63.10005(h).
---------------------------------------------------------------------------

    Upon initiation of first use of coal, residual oil, or solid oil-
derived fuel, EGUs not using PM CEMS or PM CPMS as a compliance
determination method or not meeting LEE status for PM or non-mercury
HAP metals emissions for non-liquid oil-fired EGUs (or HAP metals
emissions for liquid oil-fired EGUs) are also required to record hourly
and report semi-annually the pre- and post-PM control device flow rates
and temperatures, as well as fan amps. Moreover, the PM control device-
specific parameters are required to be recorded hourly and reported
semi-annually. The EGUs with ESPs are required to record the number of
fields in service and the secondary current and voltage for each hour
of startup and shutdown. The EGUs with FFs are required to record the
number of compartments in service and the differential pressure across
the baghouse. Finally, the EGUs with wet scrubbers that are necessary
for filterable PM emission control will record scrubber liquid-to-flue
gas ratios and scrubber liquid differential pressure for each hour of
startup and shutdown.
    Given that we do not have much information concerning continuous PM
emissions or PM emission control devices during periods of startup, the
final rule requires owners or operators of EGUs that choose to use
definition (2) of ``startup'' contained in 40 CFR 63.10042 to provide a
report prepared by an independent professional engineer that describes
the EGU, PM emissions, and PM emissions control devices both as
designed and in their current form. This information will show how each
EGU is able, or has been modified, to meet the requirements of this
rule. In addition, the information will specify the time needed to
engage PM emission control devices from initial fuel combustion in the
EGU; the effectiveness of each PM emission control device, both upon
control device startup and at normal operation; the PM emission rate;
and the uncontrolled PM emissions rate. The report will be submitted as
part of the EGU's Notification of Compliance Status, and the
information contained in the report will aid us in determining whether
or not additional work practice requirements may be needed during
startup periods to minimize HAP emissions.
    Finally, the EPA acknowledges the comments asserting safety issues
that must be considered during startup of PM controls (e.g., carbon
monoxide buildup, fabric blinding). We believe that almost all EGUs
will be able to alter their source through any number of means,
including increasing clean fuel capacity and modifying APCD operation,
and comply with the final work practice requirements; however, we
recognize that there may be rare occasions that preclude a viable
compliance option consistent with the final rule. Therefore, we are
finalizing that an owner/operator may submit to the Administrator a
request for an EGU-specific case-by-case emission standard consistent
with 40 CFR 63.6(g). Such a request requires notice-and-comment
rulemaking. Approval or disapproval authority for this type of request
is delegated to the Assistant Administrator of the Office of Air and
Radiation, and, for purposes of this rule, will be delegated no
further.\12\ However, the EPA will only consider requests that provide
evidence of a documented manufacturer-identified safety issue and can
provide proof that the PM control device is adequately designed and
sized to meet the final PM emission limit. As identified in 40 CFR
63.10011(g)(4), in its request for the case-by-case determination, the
owner/operator must provide, among other materials, documentation that:
(1) The EGU is using clean fuels to the maximum extent possible to
bring the EGU and PM control device up to the temperature necessary to
alleviate or prevent the identified safety issues prior to the
combustion of primary fuel in the EGU, (2) the EGU has explicitly
followed the manufacturer's procedures to alleviate or prevent the
identified safety issue, (3) the source provides details of the
manufacturer's statement of concern, and (4) the source provides
evidence that the PM control device is adequately designed and sized to
meet the final PM emission limit. In addition, the source will have to
indicate the other measures it will take to limit HAP emissions during
startup periods and shutdown periods to ensure a control level
consistent with the final work practice requirements. In order to
ensure compliance with the work practice standards during startup
periods, EGU owners or operators who request an alternative non-opacity
emission standard shall comply with definition (1) of startup contained
in 40 CFR 63.10042 (i.e., the definition contained in the final rule
promulgated on February 12, 2012) \13\ until the final alternative non-
opacity emission standard is promulgated in the Federal Register.
---------------------------------------------------------------------------

    \12\ See Delegation 7-121 and Delegation of Authority under the
Clean Air Act to Approve Alternatives to Test Methods and Procedures
in Parts 60, 61, 63, and 65, from Gina McCarthy to Stephen Page,
September 30, 2011, in docket ID EPA-HQ-OAR-2009-0234.
    \13\ See 77 FR 9303; February 16, 2012.
---------------------------------------------------------------------------

    We also proposed several revisions to the work practice standards
issued in the final MATS rule in response to petitions on the final
rule. Petitioners asserted that the final rule's work practice
standards should include additional fuels as ``clean fuels'' and
recognize operating limitations of certain EGU types and APCDs.
Specifically, petitioners contended that the list of clean fuels
required for use during startup in order to minimize emissions should
include, among others, synthetic natural gas, synthesis gas (syngas),
biodiesel, and ultra-low sulfur diesel (ULSD). The EPA has also been
informed that propane is used to startup some EGUs.
    In this final action, we are adding certain synthetic natural gas
(that meets the specification necessary for that gas to be transported
on a Federal Energy Regulatory Commission (FERC) regulated pipeline),
synthesis gas that has been processed through a gas clean-up train such
that it is suitable for use in the system's combustion turbine, and
ULSD to the list of clean fuels. In addition, the EPA does see merit,
as suggested by some commenters, of further broadening the definition
of ``clean fuels.'' After reviewing other rules that use or require
clean fuels, we believe that inclusion of those fuels meeting the
requirements of 40 CFR Part 80, subpart I (``Subpart I--Motor Vehicle
Diesel Fuel; Nonroad, Locomotive, and Marine Diesel Fuel; and ECA
Marine Fuel'') is appropriate. Specifically, the definitions and
provisions of 40 CFR 80.2, 80.501, 80.510, and 80.520 address sulfur
content restrictions relating to distillate, diesel (including ULSD),
and biodiesel fuels. The EPA believes that requiring use of clean
fuels, including those we are adding in this final rule, for EGUs will
significantly limit the HAP emissions from these sources during startup
periods and shutdown periods. For example, information provided to the
EPA on another rulemaking (found in Docket ID No. EPA-HQ-OAR-2008-0708-
1459) \14\ showed that the use of ULSD will significantly reduce
emissions of air toxics, including metallic HAP (e.g., nickel, zinc,
lead (Pb)) compared to the use of ``regular'' diesel. The EPA also
believes that combustion of the other 40 CFR Part 80, subpart I, fuels
meeting the subject definitions will cause significantly lower HAP
emissions than

coal and residual oil, and, as stated above, EGUs must use clean fuels
to the maximum extent possible during startup periods and shutdown
periods.
---------------------------------------------------------------------------

    \14\ Email and attachments from Paul Miller, NESCAUM, to Melanie
King, EPA. NESCAUM's RICE NESHAP comments. October 11, 2012, also
found in Docket ID No. EPA-HQ-OAR-2009-0234.
---------------------------------------------------------------------------

    We are maintaining the work practice requirement in the final MATS
that requires EGU source owners and operators, when firing coal,
residual oil, or solid oil-derived fuel in the EGU during startup or
shutdown, to vent emissions to the main stack(s) and operate all
control devices necessary to meet all operating and emissions standards
that are applicable to the source pursuant to other CAA or state
requirements. In addition, any partial (fractional) operating hour that
may occur at the beginning of a startup period or at the end of a
shutdown period is to be flagged in reports as an hour of startup or
shutdown.
    For more discussion of each of these issues, please refer to the
RTC, the TSD, and the memo ``Startup and shutdown provisions'' (Docket
ID No. EPA-HQ-OAR-2009-0234-20224) in Docket ID No. EPA-HQ-OAR-2009-
0234.
3. Treatment of IGCC EGU Syngas
    The EPA is finalizing both the use of flares and the use of duct
burners for integrated gasification combined cycle (IGCC) units to
handle syngas not combusted in the turbine during startup periods and
shutdown periods.
    An IGCC EGU includes both a gasification unit and a combustion unit
and syngas is generated in the gasifier for the primary purpose of
being combusted in the associated combustion turbine. The EPA
understands that, in some cases, the gasified fuel can be used for
other purposes such as the production of chemicals (e.g., fertilizers,
methanol) if the facility has been designed to do so. During the
startup periods and shutdown periods, some or all of the syngas
produced for the purpose of power production may not be combusted in
the turbine. We proposed two options for IGCC EGUs for handling syngas
not fired in the combustion turbine: (1) Syngas must be flared, not
vented, or (2) syngas must be routed to duct burners, which may need to
be installed, and the flue gas from the duct burners must be routed to
the heat recovery steam generator. We solicited comments on the need to
flare the unfired syngas, if it is more appropriate to require routing
of the unfired syngas back into the system for all IGCC EGUs, and on
the costs of adding duct burners, should they be required.
    Industry commenters stated that it is important that flaring remain
an option for routine startups and shutdowns for safety reasons and as
a viable option for non-routine events such as EGU ``trips'' when the
combustion turbine cannot combust syngas. Commenters noted that the
flaring option is especially critical as the re-routing option can only
be used by IGCC EGUs under limited circumstances as the syngas may lack
sufficient pressure for re-injection and gasifiers are often once-
through systems that do not support re-routing of the syngas.
Commenters indicated that the actual flaring step of an IGCC startup is
relatively short and ordinarily lasts less than 2 hours and that only
clean syngas is flared during a routine startup.
    The EPA is finalizing both options, use of flaring or duct burners,
for handling of syngas not combusted in the turbine during startup
periods and shutdown periods.\15\ The EPA believes that the controls
are comparable and that allowing the option will provide flexibility to
owners/operators of IGCC EGUs to choose either of the options subject
to operational constraints at their IGCC EGUs. The EPA believes it
appropriate to cover gasifier syngas during startup periods and
shutdown periods of the combustion turbine portion of the IGCC because
the units are inextricably linked and the unused gas would not be
generated but for the startup of the combustion portion of the IGCC
unit. The EPA is requiring the use of either flares or duct burners to
combust unused syngas during startup periods and shutdown periods.
---------------------------------------------------------------------------

    \15\ IGCC units that are also designed to co-produce chemicals
or other products using syngas may also choose to use the unburned
syngas in that process.
---------------------------------------------------------------------------

4. Common Stacks
    The final MATS rule at 40 CFR 63.10010(a)(1), (2), and (3) required
owners or operators of EGUs with common stacks to either monitor the
EGUs separately or monitor the common stack and assign the same
emissions value to each EGU. No specific requirements concerning
monitoring during startup periods or shutdown periods were given
because the EPA believed the provisions as finalized were sufficient.
Consistent with the monitoring provisions in the final rule, owners or
operators of EGUs with common stacks are required to monitor and report
emissions for compliance purposes at all times when any EGU using a
common stack is operating in a non-startup/shutdown mode, even if
another EGU using that common stack is in startup/shutdown mode. 40 CFR
63.10005(a)(2)(iii) reinforces and clarifies this requirement. Also,
consistent with the final rule, work practice standards, rather than
numeric emissions limits, apply during startup periods or shutdown
periods, but only to EGUs in startup or shutdown mode. Today's
reconsidered rule maintains the approach of the final rule. Owners or
operators of EGUs with common stacks may either monitor each EGU
separately upstream of the common stack or from the common stack.
Monitoring must be operational (except for periods of monitor
malfunction and during required quality assurance (QA) and maintenance
activities) at all times that any fuel is being combusted, and
compliance with numeric emission limits is required except for periods
when all EGUs sharing the common stack are in startup or shutdown mode.
Should an owner or operator choose to monitor the common stack, then
emissions obtained from the monitoring will be applied to each EGU that
shares the stack. This approach remains consistent with the final rule,
and is not expected to be problematic emissions-wise for any EGU using
a common stack, because the EGUs in startup periods or shutdown periods
are required to use clean fuels and comply with the other work practice
requirements. In addition, the EGUs sharing the common stack and
operating in a mode other than startup or shutdown are required to
operate such that they meet their emissions limits. We believe, based
on evaluation of source compliance for many years, that sources
generally operate in a manner to ensure a compliance margin to avoid
potential exceedances.\16\ Thus, we maintain the monitoring options
available in the final rule are sufficient to address concerns from
commenters.
---------------------------------------------------------------------------

    \16\ ``. . . (S)ources do not design to meet a standard, but
rather to meet a level comfortably lower. They do so in order to
provide a compliance margin on those days where emissions rise due
to inherent and uncontrollable variability . . .'' See 77 FR 42386;
July 18, 2012.
---------------------------------------------------------------------------

    As discussed below, the EPA is also establishing a default
electrical load of 5 percent of the maximum sustainable electrical load
of the EGU. This default value will be allowed to be used during
periods of startup or periods of shutdown when the electrical load is
zero. For EGUs sharing a common stack with just one common monitoring
system, this default value will be available only when the electrical
load is zero for an EGU sharing the common stack that is in a period of
startup or shutdown. As soon as a non-zero electrical load is produced,
that non-zero load must be used in electrical output-based emission
rate calculations for each EGU in a startup or shutdown period, even if
the load is less than 5 percent of capacity. Note that the electrical
load of all EGUs in operation and sharing a common stack with just

one common monitoring system are to be summed when electrical output-
based emission rate calculations are made.
    Section 1.2.5 of the RTC contains both a summary of comments
received on this topic and the EPA's response to those comments.
5. Diluent Cap
    Apart from allowing use of a diluent cap when calculating Hg
emissions during startup periods or shutdown periods, the final rule
contained no allowance for use of a diluent cap. The November 2012
proposal sought comment on the need for a diluent cap for other HAP
emissions during startup periods and shutdown periods. Use of a diluent
cap can be important during startup periods and shutdown periods
because CEMS values can approach infinity because the denominator in
the calculations for CEMS values can approach zero during those
periods. Moreover, use of a diluent cap becomes a common stack issue
when one or more of the EGUs is in a startup or shutdown mode and just
one monitoring instrument is used in the stack.
    The EPA considered each comment and decided to allow use of default
carbon dioxide (CO2) or oxygen (O2) values as
identified in Section <IP_ADDRESS> of Appendix F of 40 CFR part 75, but only
for startup periods or shutdown periods when CO2 values are
below or O2 values are above default values for use in all
pollutant calculations. For non-IGCC EGUs, the default CO2
value is 5 percent and the default O2 value is 14 percent.
This means that when CEMS CO2 measurements are below 5
percent, EGU owners or operators are allowed to use 5 percent
CO2 in their calculations. Because the startup analysis
showed that CEMS CO2 measurements exceeded default values
within 2 hours of generation, the EPA does not expect to find default
values being used when startup periods end. Likewise, when CEMS
O2 measurements are larger than 14 percent, EGU owners or
operators will be able to use 14-percent O2 in their
calculations. IGCC EGUs will be allowed to use 1 percent as a default
CO2 value or 19 percent as a default O2 value. As
mentioned earlier, default diluent gas values will be allowed for use
in calculations for startup periods or shutdown periods when
CO2 CEMS values are below or O2 CEMS values are
above default values. The rule requires EGU owners or operators to use
actual CO2 or O2 CEMS values for all other
operating periods. Although the EPA has no specific data or information
concerning emissions during transient events outside startup or
shutdown periods, the EPA expects the short duration of these transient
events outside startup or shutdown periods that could cause
CO2 or O2 CEMS to be below (or above) default
values to have little, if any, impact on the 30-boiler operating day
rolling averages.
    The rule retains the requirement for EGU owners or operators to
report instrumental CEMS, PM CPMS, and sorbent trap information, as
well as flow rate information during startup periods or shutdown
periods. Such information may prove useful in assessing potential
emissions or operational limits in future rulemaking activities.
Finally, the rule requires EGU owners or operators to identify each
hour of startup or shutdown in which a diluent cap value is used.
    Section 5.1 of the RTC contains both a summary of comments received
on this topic and the EPA's response.
6. Default Electrical Output
    The final rule provided no allowance regarding default electrical
output. The November 2012 proposal sought comment on the need for a
default electrical output for those owners or operators who choose to
comply with a mass per electrical output standard. Use of a default
electrical output cap can be important during startup periods and
shutdown periods because the calculated mass per electrical output
values can approach infinity when the electrical output is zero during
those periods.
    Upon consideration of the comments, the rule will provide a default
electrical load value that EGU owners or operators will be allowed to
use during startup periods or shutdown periods to calculate emissions
rates for an EGU, as long as the electrical load for the EGU is zero.
Once the EGU begins generating electricity, the source must use the
actual electrical output in compliance calculations, even if the output
is below the 5 percent default value. Moreover, use of a default
electrical load is not allowed during periods other than startup or
shutdown. As suggested by one commenter, the default electrical load
will be equivalent to 5 percent of the maximum sustainable electrical
output in megawatts of an EGU, as defined in section <IP_ADDRESS>(a)(1) of
appendix A to part 75, and included in an EGU's Part 75 electronic
monitoring plan. This maximum sustainable load is either the nameplate
capacity of the EGU or the highest electrical load observed in at least
four representative quarters of EGU operation. When used in a common
stack application, the default electrical load is 5 percent of the
combined maximum sustainable electrical load of the EGUs that are in
startup or shutdown mode during an hour in which the electrical load is
zero. The default electrical load is allowed to be used in electrical
output-based emission rate calculations (either pounds per megawatt-
hour (lb/MWh) or pounds per gigawatt-hour (lb/GWh)) for any hour in
which the actual electrical load for a single EGU or for every EGU
venting to a common stack is zero. The EPA considered, but decided
against, requiring measurement of thermal heat output and conversion
back into equivalent electrical output; instead, the EPA decided to use
a simpler approach based on already-existing requirements of the Acid
Rain Program that we believe are most appropriate considering CAA
section 112 and in light of the available data. Finally, the rule
requires EGU owners or operators to identify each hour of startup or
shutdown in which a default electrical load value is used.
    Section 5.2 of the RTC contains both a summary of comments received
on this topic and the EPA's response to significant comments.
7. Use of Sorbent Traps
    The final rule required continuous Hg data collection using sorbent
traps or Hg CEMS under all process operating conditions, including, but
not limited to, startup periods and shutdown periods, over the entire
30 boiler operating day LEE qualification testing period. For sorbent
traps, the EPA allowed use of redundant backup sorbent trap monitoring
systems during startup periods and shutdown periods; and required
operation of sorbent trap monitoring systems and collection of Hg data
at all times EGUs operate, but did not allow use of Hg data collected
during startup or shutdown periods to be included in compliance
calculations.
    After consideration of comments received on Hg monitoring during
startup or shutdown periods using sorbent trap monitoring systems, the
EPA decided that the final reconsidered rule will contain three
alternative approaches for measuring Hg emissions during startup
periods or shutdown periods. In the first approach, EGU owners or
operators will continue to be able to use Hg CEMS for measuring Hg
emissions.
    The second approach relies on at least two separate sorbent
monitoring systems. Although the rule has no prohibition against an EGU
owner or operator using one sorbent trap monitoring system for
compliance purposes during periods other than startup or shutdown and
one (or more) sorbent trap monitoring systems for

startup periods or shutdown periods through the use of a non-redundant
backup system (per section 2.2.2 of Appendix A to subpart UUUUU of Part
63), it will be clarified that two separate sorbent monitoring systems
are allowed. Reliance on this second approach would address one
commenter's concern that Hg compliance data could not be separated from
Hg data collected during startup and/or shutdown periods when
demonstrating compliance with numerical standards based on a sorbent
trap system. When an EGU with at least two such systems (one for
startup periods or shutdown periods and the other for all other
periods) entered into a startup or shutdown period, the EGU owner or
operator could switch monitoring systems either manually or
automatically. As part of an EGU owner or operator's rubric for
choosing which Hg measurement approach to use, the EGU owner or
operator should take into account that any process operating hour for
which quality assured Hg concentration data are not obtained is counted
as an hour of monitoring system downtime, per section 1.4 of Appendix A
to subpart UUUUU of Part 63. Therefore, if an EGU owner or operator
believes change-out of sorbent monitoring traps may take too long,
other approaches may be more suitable. An EGU owner or operator should
carefully consider all costs--not only of sorbent tubes, analyses, and
associated labor, but also of non-compliance due to data gaps, when
determining whether this approach is appropriate.
    The third approach, relying on just one sorbent trap monitoring
system for all periods of operation (startup, shutdown, and normal),
will be identified in the rule as a viable option for Hg monitoring,
and, for EGU owners or operators who choose this option, the rule will
allow data collected during startup or shutdown periods to be used for
compliance purposes. The EPA expects little impact on Hg emissions
during startup or shutdown periods, because, as explained above, we
believe the rule contains sufficient variability to include startup and
shutdown periods; clean fuels will be used during those periods;
default diluent and electrical output values, which tend to constrain
emissions, will be available for use; and emissions occurring during
those periods will be included in a 30- (or 90-) boiler operating day
rolling average. EGU owners or operators may find that this third
approach would work well for those instances in which sudden and
unpredictable shutdown events occur, for there would be no need to swap
sorbent trap monitoring systems to capture shutdown emissions.
    Finally, the EPA disagrees with commenters who claim that
collecting data during startup and shutdown will serve no purpose
relative to compliance with MATS and indicated that if the EPA needs to
collect startup and shutdown data to better understand performance for
a future rulemaking, that can be addressed through the information
collection request (ICR) process where the EPA demonstrates the need
and identifies a systematic plan to gather the data. As explained in
the final rule preamble,\17\ collection of startup and shutdown
information will provide the EPA with information to more fully analyze
the ability and appropriateness of establishing numeric emissions and
operating limits during startup periods or shutdown periods so the
issue can be addressed as part of the ongoing 8-year review of this
rule. Collection of these data as part of the rule will also serve to
reduce, if not eliminate, future ICR requests on this topic. The EPA
also disagrees with commenters who wish to place all startup and
shutdown information on those EGU owners or operators who choose to use
Hg CEMS, for EPA remains interested in how well sorbent tube monitoring
systems operate during startup periods or shutdown periods. Not
collecting that information from those systems would leave a gap in the
EPA's knowledge base.
---------------------------------------------------------------------------

    \17\ See 77 FR 9382 (February 16, 2012).
---------------------------------------------------------------------------

    Section 5.3 of the RTC contains both a summary of comments received
on this topic and the EPA's response to significant comments.

V. Summary of Final Action and Changes Since Proposal--Utility NSPS

    The current PM startup and shutdown requirements in the Utility
NSPS are included in 40 CFR 60.42Da(e)(2) and require the owner/
operator of an affected EGU to meet the work practice standards
specified in Table 3 of 40 CFR Part 63, subpart UUUUU (i.e., the MATS
rule). The Utility NSPS docket received a total of 23 public comments
on the startup/shutdown reconsideration proposal. One of these comments
was a duplicate. Of the remaining 22 comments, 15 were received in both
dockets, and 7 were received in the Utility NSPS docket alone. Of the
seven comments received in the Utility NSPS docket alone, four were
said to be sent to the MATS docket, but no documents that matched the
ones in the Utility NSPS docket were found in the MATS docket. However,
the majority of the comments overlap with issues raised as part of the
startup and shutdown provision included in MATS. The EPA responses to
these issues are discussed in the MATS portion of the preamble and
docket and have not been repeated here or in the Utility NSPS docket.
    The sole NSPS-specific comment we received was that the Utility
NSPS should include a definition of startup and shutdown that is
consistent with the MATS definition and that the definitions of startup
and shutdown in the Utility NSPS, MATS, and Industrial Boiler NESHAP
(subpart DDDDD) rules should be consistent. There are situations where
a facility is subject to the PM standard under 40 CFR Part 60, subpart
Da, but is not subject to MATS (e.g., a biomass-fired EGU with natural
gas burners >250 million British thermal units per hour). This facility
would, therefore, be subject to the Industrial Boiler NESHAP. We have
concluded that it is appropriate for industrial boilers and EGUs to
have the same PM startup and shutdown work practice standards for both
the NSPS and MATS. Therefore, we are amending 40 CFR 60.42Da(e)(2) so
that owners or operators of facilities subject to 40 CFR Part 63,
subpart UUUUU, shall meet the work practice standards specified in
Table 3 to Subpart UUUUU of Part 63, and owners or operators of
facilities subject to 40 CFR Part 63, subpart DDDDD, shall meet the
work practice standards specified in Table 3 to Subpart DDDDD of Part
63.
    We are also amending the regulatory text in the Utility NSPS to
incorporate the relevant startup and shutdown definitions. We have
concluded that the amended regulatory text is sufficient, and adding
definitions of startup and shutdown are not necessary for the Utility
NSPS. Using this approach is beneficial because any future amendments
to the MATS startup and shutdown provisions will automatically be
incorporated into the Utility NSPS.

VI. Impacts of This Final Rule

A. Summary of Emissions Impacts, Costs and Benefits

    Because this final rule is no more stringent than the February 2012
final rule, we expect no additional costs or benefits associated with
these revisions.

B. What are the air impacts?

    This final rule is no more stringent than the February 2012 final
rule. Accordingly, we believe that this final action will not result in
significant changes in emissions of any of the regulated pollutants.

C. What are the energy impacts?

    This final action is not anticipated to have an effect on the
supply, distribution, or use of energy. As previously stated, this
final rule is no more stringent than the February 2012 final rule.

D. What are the compliance costs?

    We believe there will be no significant change in compliance costs
as a result of this final action because electric power companies would
take the same or similar actions (e.g., operating control devices,
recording clean fuel use, etc.) as they would have to comply with the
previously finalized MATS standards. Moreover, we find no additional
monitoring costs are necessary to comply with this final action because
EGU owners or operators could continue to use the startup and shutdown
provisions of the promulgated rule to demonstrate compliance; however,
as in any other rule, EGU owners or operators may choose to conduct
additional monitoring (and incur its expense) for their own purposes.

E. What are the economic and employment impacts?

    Because we expect that electric power companies would take the same
or similar actions to meet the requirements finalized in this action as
they would have chosen to comply with the previously finalized MATS
standards, we do not anticipate that this final action will result in
significant changes in emissions, energy impacts, costs, benefits, or
economic impacts. Likewise, we believe this action will not have any
impacts on the price of electricity, employment or labor markets, or
the U.S. economy.

F. What are the benefits of the final standards?

    As previously stated, we do not anticipate any significant emission
changes resulting from this action. Therefore, there are no direct
monetized benefits or disbenefits associated with this action.

VII. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive
Order 13563: Improving Regulation and Regulatory Review

    This action is not a ``significant regulatory action'' under the
terms of Executive Order 12866 (58 FR 51735; October 4, 1993) and is,
therefore not subject to review under Executive Orders 12866 and 13563
(76 FR 3821; January 21, 2011).
    Because this final rule is no more stringent than the February 2012
final rule, we do not expect any additional costs, benefits, or
economic impacts associated with these revisions. The EPA prepared an
analysis of the potential costs and benefits associated with the 2012
final rule. This analysis is contained in the ``Economic Impact
Analysis for the Final Reconsideration of the Mercury and Air Toxics
Standards'' found in Docket ID No. EPA-HQ-OAR-2009-0234.

B. Paperwork Reduction Act

    This action does not impose any new information collection burden.
This action clarifies but does not change the information collection
requirements previously finalized and, as a result, does not impose any
additional burden on industry. However, the Office of Management and
Budget (OMB) has previously approved the information collection
requirements contained in the existing regulations (see 77 FR 9304)
under the provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et
seq. and has assigned OMB control number 2060-0567. The OMB control
numbers for EPA's regulations are listed in 40 CFR part 9.

C. Regulatory Flexibility Act

    The Regulatory Flexibility Act generally requires an agency to
prepare a regulatory flexibility analysis of any rule subject to notice
and comment rulemaking requirements under the Administrative Procedure
Act or any other statute unless the agency certifies that the rule will
not have a significant economic impact on a substantial number of small
entities. Small entities include small businesses, small organizations,
and small governmental jurisdictions.
    For purposes of assessing the impacts of this action on small
entities, a small entity is defined as: (1) A small business as defined
by the Small Business Administration's (SBA) regulations at 13 CFR
121.201; (2) a small governmental jurisdiction that is a government of
a city, county, town, school district, or special district with a
population of less that 50,000; and (3) a small organization that is
any not-for-profit enterprise which is independently owned and operated
and is not dominant in its field. Categories and entities potentially
regulated by the final rule with applicable NAICS codes are provided in
section I.A of this preamble.
    According to the SBA size standards for NAICS code 221122,
Utilities--Fossil Fuel Electric Power Generation, a firm is small if,
including its affiliates, it is primarily engaged in the generation,
transmission, and/or distribution of electric energy for sale and its
total electric output for the preceding fiscal year did not exceed 4
million MWh.
    After considering the economic impacts of this final rule on small
entities, I certify that this action will not have a significant
economic impact on a substantial number of small entities.
    The EPA has determined that none of the small entities will
experience a significant impact because the action imposes no
additional regulatory requirements on owners or operators of affected
sources.

D. Unfunded Mandates Reform Act

    This action contains no federal mandates under the provisions of
Title II of the Unfunded Mandates Reform Act of 1995 (UMRA), 2 U.S.C.
1531-1538 for state, local, or tribal governments or the private
sector. The action imposes no enforceable duty on any state, local, or
tribal governments or the private sector. Therefore, this action is not
subject to the requirements of UMRA sections 202 or 205.
    This action is also not subject to the requirements of UMRA section
203 because it contains no regulatory requirements that might
significantly or uniquely affect small governments. This action
contains no requirements that apply to such governments or impose
obligations upon them.

E. Executive Order 13132: Federalism

    This action does not have federalism implications. It will not have
substantial direct effects on the states, on the relationship between
the national government and the states, or on the distribution of power
and responsibilities among the various levels of government, as
specified in Executive Order 13132. Thus, Executive Order 13132 does
not apply to this action.

F. Executive Order 13175: Consultation and Coordination With Indian
Tribal Governments

    This action does not have tribal implications as specified in
Executive Order 13175 (65 FR 67249; November 9, 2000). It will not have
substantial direct effects on tribal governments, on the relationship
between the federal government and Indian tribes, or on the
distribution of power and responsibilities between the federal
government and Indian tribes, as specified in Executive Order 13175. No
affected facilities are owned or operated by Indian tribal governments.
Thus,

Executive Order 13175 does not apply to this action.

G. Executive Order 13045: Protection of Children From Environmental
Health Risks and Safety Risks

    This action is not subject to Executive Order 13045 (62 FR 19885;
April 23, 1997) because it is not economically significant as defined
in Executive Order 12866. The EPA has evaluated the environmental
health or safety effects of the final MATS on children. The results of
the evaluation are discussed in that final rule (77 FR 9304; February
16, 2012) and are contained in Docket ID No. EPA-HQ-OAR-2009-0234.

H. Executive Order 13211: Actions That Significantly Affect Energy
Supply, Distribution, or Use

    This action is not subject to Executive Order 13211 (66 FR 28355;
May 22, 2001) because it is not a significant regulatory action under
Executive Order 12866.

I. National Technology Transfer and Advancement Act

    Section 12(d) of the National Technology Transfer and Advancement
Act of 1995 (NTTAA); Public Law 104-113, 12(d) (15 U.S.C. 272 note)
directs the EPA to use voluntary consensus standards (VCS) in their
regulatory and procurement activities unless to do so would be
inconsistent with applicable law or otherwise impracticable. VCS are
technical standards (e.g., material specifications, test methods,
sampling procedures, and business practices) that are developed or
adopted by VCS bodies. The NTTAA requires the EPA to provide Congress,
through OMB, explanations when the agency decides not to use available
and applicable VCS.
    This action does not involve VCS. Therefore, the EPA did not
consider the use of any VCS.

J. Executive Order 12898: Federal Actions To Address Environmental
Justice in Minority Populations and Low-Income Populations

    Executive Order 12898 (59 FR 7629; February 16, 1994) establishes
federal executive policy on environmental justice. Its main provision
directs federal agencies, to the greatest extent practicable and
permitted by law, to make environmental justice part of their mission
by identifying and addressing, as appropriate, disproportionately high
and adverse human health or environmental effects of their programs,
policies, and activities on minority populations and low-income
populations in the United States.
    The EPA has determined that this final rule will not have
disproportionately high and adverse human health or environmental
effects on minority, low-income, or indigenous populations because it
does not affect the level of protection provided to human health or the
environment. The EPA has evaluated the environmental health or
environmental effects of the final MATS on minority, low-income, or
indigenous populations. The results of the evaluation are discussed in
that final rule (77 FR 9304; February 16, 2012) and are contained in
Docket ID No. EPA-HQ-OAR-2009-0234.

K. Congressional Review Act

    The Congressional Review Act, 5 U.S.C. 801 et seq., as added by the
Small Business Regulatory Enforcement Fairness Act of 1996, generally
provides that before a rule may take effect, the agency promulgating
the rule must submit a rule report, which includes a copy of the rule,
to each House of the Congress and to the Comptroller General of the
United States. The EPA will submit a report containing this final rule
and other required information to the U.S. Senate, the U.S. House of
Representatives, and the Comptroller General of the United States prior
to publication of the rule in the Federal Register. A major rule cannot
take effect until 60 days after it is published in the Federal
Register. This action is not a ``major rule'' as defined by 5 U.S.C.
804(2). This final rule will be effective on November 19, 2014.

List of Subjects

40 CFR Part 60

    Environmental protection, Administrative practice and procedure,
Air pollution control, Intergovernmental relations, Reporting and
recordkeeping requirements.

40 CFR Part 63

    Environmental protection, Administrative practice and procedure,
Air pollution control, Hazardous substances, Intergovernmental
relations, Reporting and recordkeeping requirements.

    Dated: November 7, 2014.
Gina McCarthy,
Administrator.
    For the reasons discussed in the preamble, the EPA amends 40 CFR
parts 60 and 63 to read as follows:

PART 60--STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES

0
1. The authority citation for 40 CFR part 60 continues to read as
follows:

    Authority:  42 U.S.C. 7401 et seq.

0
2. Section 60.42Da is amended by revising paragraph (e)(2) to read as
follows:

Sec.  60.42Da  Standards for particulate matter (PM).

* * * * *
    (e) * * *
    (2) During startup periods and shutdown periods, owners or
operators of facilities subject to subpart UUUUU of part 63 of this
chapter shall meet the work practice standards specified in Table 3 to
subpart UUUUU of part 63 and use the relevant definitions in Sec.
63.10042, and owners or operators of facilities subject to subpart
DDDDD of part 63 shall meet the work practice standards specified in
Table 3 to subpart DDDDD of part 63 and use the relevant definition
used in Sec.  63.7575.
* * * * *

PART 63--NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS
FOR SOURCE CATEGORIES

0
3. The authority citation for 40 CFR part 63 continues to read as
follows:

    Authority: 42 U.S.C. 7401 et seq.

0
4. Section 63.10000 is amended by revising paragraph (c)(1)(vi) and
adding paragraph (l) to read as follows:

Sec.  63.10000  What are my general requirements for complying with
this subpart?

* * * * *
    (c)(1) * * *
    (vi) If your coal-fired or solid oil-derived fuel-fired EGU does
not qualify as a LEE for Hg, you must demonstrate initial and
continuous compliance through use of a Hg CEMS or a sorbent trap
monitoring system, in accordance with appendix A to this subpart.
    (A) You may choose to use separate sorbent trap monitoring systems
to comply with this subpart: One sorbent trap monitoring system to
demonstrate compliance with the numeric mercury emissions limit during
periods other than startup or shutdown and the other sorbent trap
monitoring system to report average mercury concentration during
startup periods or shutdown periods.
    (B) You may choose to use one sorbent trap monitoring system to
demonstrate compliance with the mercury emissions limit at all times

(including startup periods and shutdown periods) and to report average
mercury concentration. You must follow the startup or shutdown
requirements that follow and as given in Table 3 to this subpart for
each coal-fired, liquid oil-fired, or solid oil-derived fuel-fired EGU.
* * * * *
    (l) On or before the date an EGU is subject to this subpart, you
must install, certify, operate, maintain, and quality assure each
monitoring system necessary for demonstrating compliance with the work
practice standards for PM or non-mercury HAP metals during startup
periods and shutdown periods. You must collect, record, report, and
maintain data obtained from these monitoring systems during startup
periods and shutdown periods.

0
5. Section 63.10005 is amended by revising paragraph (a)(2) to read as
follows:

Sec.  63.10005  What are my initial compliance requirements and by what
date must I conduct them?

    (a) * * *
    (2) To demonstrate initial compliance using either a CMS that
measures HAP concentrations directly (i.e., an Hg, HCl, or HF CEMS, or
a sorbent trap monitoring system) or an SO2 or PM CEMS, the
initial performance test consists of 30- (or, if emissions averaging
for Hg is used, 90-) boiler operating days of data collected by the
initial compliance demonstration date specified in Sec.  63.9984(f)
with the certified monitoring system. Pollutant emission rates measured
during startup periods and shutdown period (as defined in Sec.
63.10042) are not to be included in the compliance demonstration,
except as otherwise provided in Sec.  63.10000(c)(1)(vi)(B) and
paragraph (a)(2)(iii) of this section.
    (i) The 30- (or, if applicable, 90-) boiler operating day CMS
performance test must demonstrate compliance with the applicable Hg,
HCl, HF, PM, or SO2 emissions limit in Table 1 or 2 to this
subpart.
    (ii) You must collect hourly data from auxiliary monitoring systems
(i.e., stack gas flow rate, CO2, O2, or moisture,
as applicable) during the performance test period, in order to convert
the pollutant concentrations to units of the standard. If you choose to
comply with an electrical output-based emission limit, you must also
collect hourly electrical load data during the performance test period.
    (iii) For a group of affected units that are in the same
subcategory, are subject to the same emission standards, and share a
common stack, if you elect to demonstrate compliance by monitoring
emissions at the common stack, startup and shutdown emissions (if any)
that occur during the 30-(or, if applicable, 90-) boiler operating day
performance test must either be excluded from or included in the
compliance demonstration as follows:
    (A) If one of the units that shares the stack either starts up or
shuts down at a time when none of the other units is operating, you
must exclude all pollutant emission rates measured during the startup
or shutdown period, unless you are using a sorbent trap monitoring
system to measure Hg emissions and have elected to include startup and
shutdown emissions in the compliance demonstrations;
    (B) If all units that are currently operating are in the startup or
shutdown mode, you must exclude all pollutant emission rates measured
during the startup or shutdown period, unless you are using a sorbent
trap monitoring system to measure Hg emissions and have elected to
include startup and shutdown emissions in the compliance
demonstrations; or
    (C) If any unit starts up or shuts down at a time when another unit
is operating, and the other unit is not in the startup or shutdown
mode, you must include all pollutant emission rates measured during the
startup or shutdown period in the compliance demonstrations.
* * * * *

0
6. Section 63.10007 is amended by revising paragraph (a)(1),
redesignating paragraph (f) as paragraph (g), and adding a new
paragraph (f) to read as follows:

Sec.  63.10007  What methods and other procedures must I use for the
performance tests?

    (a) * * *
    (1) If you use CEMS (Hg, HCl, SO2, or other) to
determine compliance with a 30- (or, if applicable, 90-) boiler
operating day rolling average emission limit, you must collect quality-
assured CEMS data for all unit operating conditions, including startup
and shutdown (see Sec.  63.10011(g) and Table 3 to this subpart),
except as otherwise provided in Sec.  63.10020(b). Emission rates
determined during startup periods and shutdown periods (as defined in
Sec.  63.10042) are not to be included in the compliance
determinations, except as otherwise provided in Sec. Sec.
63.10000(c)(1)(vi)(B) and 63.10005(a)(2)(iii).
* * * * *
    (f) If you elect to (or are required to) use CEMS to continuously
monitor Hg, HCl, HF, SO2, or PM emissions (or, if
applicable, sorbent trap monitoring systems to continuously collect Hg
emissions data), the following default values are available for use in
the emission rate calculations during startup periods or shutdown
periods (as defined in Sec.  63.10042). For the purposes of this
subpart, these default values are not considered to be substitute data.
    (1) Diluent cap values. If you use CEMS (or, if applicable, sorbent
trap monitoring systems) to comply with a heat input-based emission
rate limit, you may use the following diluent cap values for a startup
or shutdown hour in which the measured CO2 concentration is
below the cap value or the measured O2 concentration is
above the cap value:
    (i) For an IGCC EGU, you may use 1% for CO2 or 19% for
O2.
    (ii) For all other EGUs, you may use 5% for CO2 or 14%
for O2.
    (2) Default electrical load. If you use CEMS to continuously
monitor Hg, HCl, HF, SO2, or PM emissions (or, if
applicable, sorbent trap monitoring systems to continuously collect Hg
emissions data), the following default value is available for use in
the emission rate calculations during startup periods or shutdown
periods (as defined in Sec.  63.10042). For the purposes of this
subpart, this default value is not considered to be substitute data.
For a startup or shutdown hour in which there is heat input to an
affected EGU but zero electrical load, you must calculate the pollutant
emission rate using a value equivalent to 5% of the maximum sustainable
electrical output, expressed in megawatts, as defined in section
<IP_ADDRESS>(a)(1) of Appendix A to part 75 of this chapter. This default
electrical load is either the nameplate capacity of the EGU or the
highest electrical load observed in at least four representative
quarters of EGU operation. For a monitored common stack, the default
electrical load is used only when all EGUs are operating (i.e.,
combusting fuel) are in startup or shutdown mode, and have zero
electrical generation. Under those conditions, a default electrical
load equal to 5% of the combined maximum sustainable electrical load of
the EGUs that are operating but have a total of zero electrical load
must be used to calculate the hourly electrical output-based pollutant
emissions rate.
* * * * *

0
7. Section 63.10010 is amended by revising paragraph (f)(4) and adding
paragraph (l) to read as follows:

Sec.  63.10010  What are my monitoring, installation, operation, and
maintenance requirements?

* * * * *

    (f) * * *
    (4) Use only unadjusted, quality-assured SO2
concentration values in the emissions calculations; do not apply bias
adjustment factors to the part 75 SO2 data and do not use
part 75 substitute data values. For startup or shutdown hours (as
defined in Sec.  63.10042) the default electrical load and the diluent
cap are available for use in the hourly SO2 emission rate
calculations, as described in Sec.  63.10007(f). Use a flag to identify
each startup or shutdown hour and report a special code if the diluent
cap or default electrical load is used to calculate the SO2
emission rate for any of these hours.
* * * * *
    (l) You must install, certify, operate, maintain, and quality
assure each monitoring system necessary for demonstrating compliance
with the PM or non-mercury metals work practice standards for startup
periods.
    (1) You shall develop a site-specific monitoring plan for PM or
non-mercury metals work practice monitoring during startup periods.
    (2) You shall submit the site-specific monitoring plan upon request
by the Administrator.
    (3) The provisions of the monitoring plan must address the
following items:
    (i) Monitoring system installation;
    (ii) Performance and equipment specifications;
    (iii) Schedule for initial and periodic performance evaluations;
    (iv) Performance evaluation procedures and acceptance criteria;
    (v) On-going operation and maintenance procedures; and
    (vi) On-going recordkeeping and reporting procedures.
    (4) You may rely on monitoring system specifications or
instructions to address paragraphs (l)(3)(i) through (vi) of this
section.
    (5) You must operate and maintain the monitoring system according
to the site-specific monitoring plan.

0
8. Section 63.10011 is amended by revising paragraph (g) to read as
follows:

Sec.  63.10011  How do I demonstrate initial compliance with the
emission limits and work practice standards?

* * * * *
    (g) You must follow the startup or shutdown requirements as given
in Table 3 to this subpart for each coal-fired, liquid oil-fired, or
solid oil-derived fuel-fired EGU.
    (1) You may use the diluent cap and default electrical load values,
as described in Sec.  63.10007(f), during startup periods or shutdown
periods.
    (2) You must operate all CMS, collect data, calculate pollutant
emission rates, and record data during startup periods or shutdown
periods.
    (3) You must report the information as required in Sec.  63.10031.
    (4) If you choose to use paragraph (2) of the definition of
``startup'' in Sec.  63.10042 and you find that you are unable to
safely engage and operate your particulate matter (PM) control(s)
within 1 hour of first firing of coal, residual oil, or solid oil-
derived fuel, you may choose to rely on paragraph (1) of definition of
``startup'' in Sec.  63.10042 or you may submit a request to use an
alternative non-opacity emissions standard, as described below.
    (i) As mentioned in Sec.  63.6(g)(1), the request will be published
in the Federal Register for notice and comment rulemaking. Until
promulgation in the Federal Register of the final alternative non-
opacity emission standard, you shall comply with paragraph (1) of the
definition of ``startup'' in Sec.  63.10042. You shall not implement
the alternative non-opacity emissions standard until promulgation in
the Federal Register of the final alternative non-opacity emission
standard.
    (ii) The request need not address the items contained in Sec.
63.6(g)(2).
    (iii) The request shall provide evidence of a documented
manufacturer-identified safely issue.
    (iv) The request shall provide information to document that the PM
control device is adequately designed and sized to meet the PM emission
limit applicable to the EGU.
    (v) In addition, the request shall contain documentation that:
    (A) The EGU is using clean fuels to the maximum extent possible to
bring the EGU and PM control device up to the temperature necessary to
alleviate or prevent the identified safety issues prior to the
combustion of primary fuel in the EGU;
    (B) The EGU has explicitly followed the manufacturer's procedures
to alleviate or prevent the identified safety issue; and
    (C) Identifies with specificity the details of the manufacturer's
statement of concern.
    (vi) The request shall specify the other work practice standards
the EGU owner or operator will take to limit HAP emissions during
startup periods and shutdown periods to ensure a control level
consistent with the work practice standards of the final rule.
    (vii) You must comply with all other work practice requirements,
including but not limited to data collection, recordkeeping, and
reporting requirements.

0
9. Section 63.10020 is amended by revising paragraph (c) and adding
paragraph (e) to read as follows:

Sec.  63.10020  How do I monitor and collect data to demonstrate
continuous compliance?

* * * * *
    (c) You may not use data recorded during EGU startup or shutdown in
calculations used to report emissions, except as otherwise provided in
Sec. Sec.  63.10000(c)(1)(vi)(B) and 63.10005(a)(2)(iii). In addition,
data recorded during monitoring system malfunctions or monitoring
system out-of-control periods, repairs associated with monitoring
system malfunctions or monitoring system out-of-control periods, or
required monitoring system quality assurance or control activities may
not be used in calculations used to report emissions or operating
levels. You must use all of the quality-assured data collected during
all other periods in assessing the operation of the control device and
associated control system.
* * * * *
    (e) Additional requirements during startup periods or shutdown
periods.
    (1) During each period of startup, you must record for each EGU:
    (i) The date and time that clean fuels being combusted for the
purpose of startup begins;
    (ii) The quantity and heat input of clean fuel for each hour of
startup;
    (iii) The electrical load for each hour of startup;
    (iv) The date and time that non-clean fuel combustion begins; and
    (v) The date and time that clean fuels being combusted for the
purpose of startup ends.
    (2) During each period of shutdown, you must record for each EGU:
    (i) The date and time that clean fuels being combusted for the
purpose of shutdown begins;
    (ii) The quantity and heat input of clean fuel for each hour of
shutdown;
    (iii) The electrical load for each hour of shutdown;
    (iv) The date and time that non-clean fuel combustion ends; and
    (v) The date and time that clean fuels being combusted for the
purpose of shutdown ends.
    (3) For PM or non-mercury HAP metals work practice monitoring
during startup periods, you must monitor and collect data according to
this section and the site-specific monitoring plan required by Sec.
63.10011(l).
    (i) Except for an EGU that uses PM CEMS or PM CPMS to demonstrate
compliance with the PM emissions limit or that has LEE status for
filterable PM or total non-Hg HAP metals for non-

liquid oil-fired EGUs (or HAP metals emissions for liquid oil-fired
EGUs), or individual non-mercury metals CEMS you must:
    (A) Record temperature and flow rate of post-combustion (exhaust)
gas and amperage of forced draft fan(s) upstream of each filterable PM
control device during each hour of startup.
    (B) Record temperature and flow rate of exhaust gas and amperage of
induced draft fan(s) downstream of each filterable control device
during each hour of startup.
    (C) For an EGU with an electrostatic precipitator, record the
number of fields in service, as well as each field's secondary voltage
and secondary current during each hour of startup.
    (D) For an EGU with a fabric filter, record the number of
compartments in service, as well as the differential pressure across
the baghouse during each hour of startup.
    (E) For an EGU with a wet scrubber needed for filterable PM
control, record the scrubber liquid to fuel ratio and the differential
pressure of the liquid during each hour of startup.
    (ii) [Reserved]

0
10. Section 63.10021 is amended by revising paragraph (h) to read as
follows:

Sec.  63.10021  How do I demonstrate continuous compliance with the
emission limitations, operating limits, and work practice standards?

* * * * *
    (h) You must follow the startup or shutdown requirements as given
in Table 3 to this subpart for each coal-fired, liquid oil-fired, or
solid oil-derived fuel-fired EGU.
    (1) You may use the diluent cap and default electrical load values,
as described in Sec.  63.10007(f), during startup periods or shutdown
periods.
    (2) You must operate all CMS, collect data, calculate pollutant
emission rates, and record data during startup periods or shutdown
periods.
    (3) You must report the information as required in Sec.  63.10031.
    (4) You may choose to submit an alternative non-opacity emission
standard, in accordance with the requirements contained in Sec.
63.10011(g)(4). Until promulgation in the Federal Register of the final
alternative non-opacity emission standard, you shall comply with
paragraph (1) of the definition of ``startup'' in Sec.  63.10042.
* * * * *
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11. Section 63.10022 is amended by revising the introductory text of
paragraph (a) and adding paragraph (a)(4) to read as follows:

Sec.  63.10022  How do I demonstrate continuous compliance under the
emissions averaging provision?

    (a) Following the compliance date, the owner or operator must
demonstrate compliance with this subpart on a continuous basis by
meeting the requirements of paragraphs (a)(1) through (4) of this
section.
* * * * *
    (4) For each existing EGU participating in the emissions averaging
option, operate in accordance with the startup or shutdown work
practice requirements given in Table 3 to this subpart.
* * * * *

0
12. Section 63.10030 is amended by revising the introductory text of
paragraph (e) and adding paragraph (e)(8) to read as follows:

Sec.  63.10030  What notifications must I submit and when?

* * * * *
    (e) When you are required to conduct an initial compliance
demonstration as specified in Sec.  63.10011(a), you must submit a
Notification of Compliance Status according to Sec.  63.9(h)(2)(ii).
The Notification of Compliance Status report must contain all the
information specified in paragraphs (e)(1) through (8) of this section,
as applicable.
* * * * *
    (8) Identification of whether you plan to rely on paragraph (1) or
(2) of the definition of ``startup'' in Sec.  63.10042.
    (i) Should you choose to rely on paragraph (2) of the definition of
``startup'' in Sec.  63.10042 for your EGU, you shall include a report
that identifies:
    (A) The original EGU installation date;
    (B) The original EGU design characteristics, including, but not
limited to, fuel and PM controls;
    (C) Each design PM control device efficiency;
    (D) The design PM emission rate from the EGU in terms of pounds PM
per MMBtu and pounds PM per hour;
    (E) The design time from start of fuel combustion to necessary
conditions for each PM control device startup;
    (F) Each design PM control device efficiency upon startup of the PM
control device;
    (G) The design EGU uncontrolled PM emission rate in terms of pounds
PM per hour;
    (H) Each change from the original design that did or could have
changed PM emissions, including, but not limited to, each different
fuel mix, each revision to each PM control device, and each EGU
revision, along with the month and year that the change occurred;
    (I) Current EGU PM producing characteristics, including, but not
limited to, fuel mix and PM controls;
    (J) Current PM emission rate from the EGU in terms of pounds PM per
MMBtu and pounds per hour;
    (K) Current PM control device efficiency from each PM control
device;
    (L) Current time from start of fuel combustion to conditions
necessary for each PM control device startup;
    (M) Current PM control device efficiency upon startup of each PM
control device; and
    (N) Current EGU uncontrolled PM emission rate in terms of pounds PM
per hour.
    (ii) The report shall be prepared, signed, and sealed by a
professional engineer licensed in the state where your EGU is located.
Apart from preparing, signing, and sealing this report, the
professional engineer shall be independent and not otherwise employed
by your company, any parent company of your company, or any subsidiary
of your company.

0
13. Section 63.10031 is amended by revising the introductory text of
paragraph (c) and adding paragraph (c)(5) to read as follows:

Sec.  63.10031  What reports must I submit and when?

* * * * *
    (c) The compliance report must contain the information required in
paragraphs (c)(1) through (5) of this section.
* * * * *
    (5) For each instance of startup or shutdown:
    (i) Include the maximum clean fuel storage capacity and the maximum
hourly heat input that can be provided for each clean fuel determined
according to the requirements of Sec.  63.10032(f).
    (ii) Include the information required to be monitored, collected,
or recorded according to the requirements of Sec.  63.10020(e).
    (iii) If you choose to use CEMS for compliance purposes, include
hourly average CEMS values and hourly average flow rates. Use units of
milligrams per cubic meter for PM CEMS, micrograms per cubic meter for
Hg CEMS, and ppmv for HCl, HF, or SO2 CEMS. Use units of
standard cubic meters per hour on a wet basis for flow rates.
    (iv) If you choose to use a separate sorbent trap measurement
system for startup or shutdown reporting periods, include hourly
average mercury

concentration in terms of micrograms per cubic meter.
    (v) If you choose to use a PM CPMS, include hourly average
operating parameter values in terms of the operating limit, as well as
the operating parameter to PM correlation equation.
* * * * *

0
14. Section 63.10032 is amended by revising paragraph (f) to read as
follows:

Sec.  63.10032  What records must I keep?

* * * * *
    (f) Regarding startup periods or shutdown periods:
    (1) You must keep records of the occurrence and duration of each
startup or shutdown;
    (2) You must keep records of the determination of the maximum clean
fuel capacity for each EGU;
    (3) You must keep records of the determination of the maximum
hourly clean fuel heat input and of the hourly clean fuel heat input
for each EGU; and
    (4) You must keep records of the information required in Sec.
63.10020(e).
* * * * *

0
15. In Sec.  63.10042:
0
a. Revise the definitions for ``Boiler operating day,'' ``Shutdown'',
and ``Startup''; and
0
b. Add in alphabetical order new definitions for ``Clean fuel,''
``Default electrical load,'' and ``Diluent cap.''
    The revisions and additions read as follows:

Sec.  63.10042  What definitions apply to this subpart?

* * * * *
    Boiler operating day means a 24-hour period that begins at midnight
and ends the following midnight during which any fuel is combusted at
any time in the EGU, excluding startup periods or shutdown periods. It
is not necessary for the fuel to be combusted the entire 24-hour
period.
* * * * *
    Clean fuel means natural gas, synthetic natural gas that meets the
specification necessary for that gas to be transported on a Federal
Energy Regulatory Commission (FERC) regulated pipeline, propane,
distillate oil, synthesis gas that has been processed through a gas
clean-up train such that it could be used in a system's combustion
turbine, or ultra-low-sulfur diesel (ULSD) oil, including those fuels
meeting the requirements of 40 CFR part 80, subpart I (``Subpart I--
Motor Vehicle Diesel Fuel; Nonroad, Locomotive, and Marine Diesel Fuel;
and ECA Marine Fuel'').
* * * * *
    Default electrical load means an electrical load equal to 5 percent
of the maximum sustainable electrical output (megawatts), as defined in
section <IP_ADDRESS>(a)(1) of Appendix A to part 75 of this chapter, of an
affected EGU that is in startup or shutdown mode. For monitored common
stack configurations, the default electrical load is 5 percent of the
combined maximum sustainable electrical load of the EGUs that are in
startup or shutdown mode during an hour in which the electrical load
for all operating EGUs is zero. The default electrical load is used to
calculate the electrical output-based emission rate (lb/MWh or lb/GWh,
as applicable) for any startup or shutdown hour in which the actual
electrical load is zero. The default electrical load is not used for
EGUs required to make heat input-based emission rate (lb/MMBtu or lb/
TBtu, as applicable) calculations. For the purposes of this subpart,
the default electrical load is not considered to be a substitute data
value.
* * * * *
    Diluent cap means a default CO2 or O2
concentration that may be used to calculate the Hg, HCl, HF, or
SO2 emission rate (lb/MMBtu or lb/TBtu, as applicable)
during a startup or shutdown hour in which the measured CO2
concentration is below the cap value or the measured O2
concentration is above the cap value. The appropriate diluent cap
values for EGUs are presented in Sec.  63.10007(f) and in section
<IP_ADDRESS> of Appendix A to this subpart. For the purposes of this
subpart, the diluent cap is not considered to be a substitute data
value.
* * * * *
    Shutdown means the period in which cessation of operation of an EGU
is initiated for any purpose. Shutdown begins when the EGU no longer
generates electricity or makes useful thermal energy (such as heat or
steam) for industrial, commercial, heating, or cooling purposes or when
no coal, liquid oil, syngas, or solid oil-derived fuel is being fired
in the EGU, whichever is earlier. Shutdown ends when the EGU no longer
generates electricity or makes useful thermal energy (such as steam or
heat) for industrial, commercial, heating, or cooling purposes, and no
fuel is being fired in the EGU. Any fraction of an hour in which
shutdown occurs constitutes a full hour of shutdown.
    Startup means:
    (1) Either the first-ever firing of fuel in a boiler for the
purpose of producing electricity, or the firing of fuel in a boiler
after a shutdown event for any purpose. Startup ends when any of the
steam from the boiler is used to generate electricity for sale over the
grid or for any other purpose (including on-site use). Any fraction of
an hour in which startup occurs constitutes a full hour of startup; or
    (2) The period in which operation of an EGU is initiated for any
purpose. Startup begins with either the firing of any fuel in an EGU
for the purpose of producing electricity or useful thermal energy (such
as heat or steam) for industrial, commercial, heating, or cooling
purposes (other than the first-ever firing of fuel in a boiler
following construction of the boiler) or for any other purpose after a
shutdown event. Startup ends 4 hours after the EGU generates
electricity that is sold or used for any other purpose (including on
site use), or 4 hours after the EGU makes useful thermal energy (such
as heat or steam) for industrial, commercial, heating, or cooling
purposes (16 U.S.C. 796(18)(A) and 18 CFR 292.202(c)), whichever is
earlier. Any fraction of an hour in which startup occurs constitutes a
full hour of startup.
* * * * *

0
16. Revise Table 3 to subpart UUUUU of part 63 to read as follows:

      Table 3 to Subpart UUUUU of Part 63--Work Practice Standards
    [As stated in Sec.   63.9991, you must comply with the following
                  applicable work practice standards:]
------------------------------------------------------------------------
     If your EGU is . . .          You must meet the following . . .
------------------------------------------------------------------------
1. An existing EGU...........  Conduct a tune-up of the EGU burner and
                                combustion controls at least each 36
                                calendar months, or each 48 calendar
                                months if neural network combustion
                                optimization software is employed, as
                                specified in Sec.   63.10021(e).
2. A new or reconstructed EGU  Conduct a tune-up of the EGU burner and
                                combustion controls at least each 36
                                calendar months, or each 48 calendar
                                months if neural network combustion
                                optimization software is employed, as
                                specified in Sec.   63.10021(e).

3. A coal-fired, liquid oil-   You have the option of complying using
 fired (excluding limited-use   either of the following work practice
 liquid oil-fired subcategory   standards.
 units), or solid oil-derived  (1) If you choose to comply using
 fuel-fired EGU during          paragraph (1) of the definition of
 startup.                       ``startup'' in Sec.   63.10042, you must
                                operate all CMS during startup. Startup
                                means either the first-ever firing of
                                fuel in a boiler for the purpose of
                                producing electricity, or the firing of
                                fuel in a boiler after a shutdown event
                                for any purpose. Startup ends when any
                                of the steam from the boiler is used to
                                generate electricity for sale over the
                                grid or for any other purpose (including
                                on site use). For startup of a unit, you
                                must use clean fuels as defined in Sec.
                                 63.10042 for ignition. Once you convert
                                to firing coal, residual oil, or solid
                                oil-derived fuel, you must engage all of
                                the applicable control technologies
                                except dry scrubber and SCR. You must
                                start your dry scrubber and SCR systems,
                                if present, appropriately to comply with
                                relevant standards applicable during
                                normal operation. You must comply with
                                all applicable emissions limits at all
                                times except for periods that meet the
                                applicable definitions of startup and
                                shutdown in this subpart. You must keep
                                records during startup periods. You must
                                provide reports concerning activities
                                and startup periods, as specified in
                                Sec.   63.10011(g) and Sec.
                                63.10021(h) and (i).
                               (2) If you choose to comply using
                                paragraph (2) of the definition of
                                ``startup'' in Sec.   63.10042, you must
                                operate all CMS during startup. You must
                                also collect appropriate data, and you
                                must calculate the pollutant emission
                                rate for each hour of startup.
                               For startup of an EGU, you must use one
                                or a combination of the clean fuels
                                defined in Sec.   63.10042 to the
                                maximum extent possible throughout the
                                startup period. You must have sufficient
                                clean fuel capacity to engage and
                                operate your PM control device within
                                one hour of adding coal, residual oil,
                                or solid oil-derived fuel to the unit.
                                You must meet the startup period work
                                practice requirements as identified in
                                Sec.   63.10020(e).
                               Once you start firing coal, residual oil,
                                or solid oil-derived fuel, you must vent
                                emissions to the main stack(s). You must
                                comply with the applicable emission
                                limits within 4 hours of start of
                                electricity generation. You must engage
                                and operate your particulate matter
                                control(s) within 1 hour of first firing
                                of coal, residual oil, or solid oil-
                                derived fuel.
                               You must start all other applicable
                                control devices as expeditiously as
                                possible, considering safety and
                                manufacturer/supplier recommendations,
                                but, in any case, when necessary to
                                comply with other standards made
                                applicable to the EGU by a permit limit
                                or a rule other than this Subpart that
                                require operation of the control
                                devices.
                               Relative to the syngas not fired in the
                                combustion turbine of an IGCC EGU during
                                startup, you must either: (1) flare the
                                syngas, or (2) route the syngas to duct
                                burners, which may need to be installed,
                                and route the flue gas from the duct
                                burners to the heat recovery steam
                                generator.
                               If you choose to use just one set of
                                sorbent traps to demonstrate compliance
                                with Hg emission limits, you must comply
                                with all applicable Hg emission limits
                                at all times; otherwise, you must comply
                                with all applicable emission limits at
                                all times except for startup or shutdown
                                periods conforming to this practice. You
                                must collect monitoring data during
                                startup periods, as specified in Sec.
                                63.10020(a) and (e). You must keep
                                records during startup periods, as
                                provided in Sec.  Sec.   63.10032 and
                                63.10021(h). Any fraction of an hour in
                                which startup occurs constitutes a full
                                hour of startup. You must provide
                                reports concerning activities and
                                startup periods, as specified in Sec.
                                Sec.   63.10011(g), 63.10021(i), and
                                63.10031.
4. A coal-fired, liquid oil-   You must operate all CMS during shutdown.
 fired (excluding limited-use   You must also collect appropriate data,
 liquid oil-fired subcategory   and you must calculate the pollutant