[Federal Register: April 7, 2006 (Volume 71, Number 67)]
[Rules and Regulations]
[Page 17738-17750]
[DOCID:fr07ap06-13]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63

[EPA-HQ-OAR-2002-0057; FRL-8055-6]
RIN 2060-AM25

National Emission Standards for Hazardous Air Pollutants:
Hydrochloric Acid Production

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: This action finalizes amendments to national emission
standards for hazardous air pollutants (NESHAP) for hydrochloric acid
(HCl) production facilities, including HCl production at fume silica
facilities. The amendments to the final rule clarify certain
applicability provisions, emission standards, and testing, maintenance,
and reporting requirements. The amendments also correct several
omissions and typographical errors in the final rule. We are finalizing
the amendments to facilitate compliance and improve understanding of
the final rule requirements.

DATES: The final rule is effective April 7, 2006.

ADDRESSES: Docket. EPA has established a docket for this action
including Docket ID No. EPA-HQ-OAR-2002-0057, legacy EDOCKET ID No.
OAR-2002-0057, and legacy Docket ID No. A-99-41. All documents in the
docket are listed on the http://www.regulations.gov Web site. 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, is not placed on the Internet and will be
publicly available only in hard copy form. Publicly available docket
materials are available either electronically through http://www.regulations.gov
 or in hard copy at the following address: Air and

Radiation Docket and Information Center (Air Docket), EPA/DC, EPA West,
Room B102, 1301 Constitution Avenue, NW., Washington, DC 20004. This
Docket Facility is open from 8:30 a.m. to 4:30 p.m., Monday through
Friday, excluding legal holidays. The Docket telephone number is (202)
566-1744. The 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 information concerning
applicability and rule determinations, contact your State or local
regulatory agency representative or the appropriate EPA Regional Office
representative. For information concerning analyses performed in
developing the final amendments, contact Mr. Randy McDonald, Coatings
and Chemicals Group, Sectors Policies and Programs Division (C439-01),
U.S. EPA, Research Triangle Park, North Carolina 27711; telephone
number<PHONE_NUMBER>; fax number<PHONE_NUMBER>; electronic mail
address<EMAIL_ADDRESS>
SUPPLEMENTARY INFORMATION:
    Regulated Entities. Categories and entities potentially regulated
by this action include:

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            Category               SIC \a\     NAICS \b\                     Regulated entities
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Industry.......................         2819       325188  Hydrochloric Acid Production.
                                        2821       325211  .....................................................
                                        2869       325199  .....................................................
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\a\ Standard Industrial Classification.
\b\ North American Information Classification System.

    This list is not intended to be exhaustive, but rather provides a
guide for readers regarding entities likely to be regulated by this
action. To determine whether your facility is regulated by this action,
you should examine the applicability criteria in section 63.8985 of the
final rule. If you have questions regarding the applicability of this
action to a particular entity, consult your State or local agency (or
EPA Regional Office) described in the preceding FOR FURTHER INFORMATION
CONTACT section.
    Worldwide Web (WWW). In addition to being available in the docket,
an electronic copy of today's action is available on the WWW through
the Technology Transfer Network (TTN). Following signature, a copy of
the final amendments will be posted on the TTN's policy and guidance
page for newly proposed or promulgated rules http://www.epa.gov/ttn/oarpg
.

    Judicial Review. Under section 307(b) of the Clean Air Act (CAA),
judicial review of the final rule is available only by filing a
petition for review in the U.S. Court of Appeals for the District of
Columbia Circuit on or before June 6, 2006. Only those objections to
the final rule which were raised with reasonable specificity during the
period for public comment may be raised during judicial review.
Moreover, under CAA section 307(b)(2), the requirements established by
today's final action may not be challenged separately in any civil or
criminal proceeding we bring to enforce these requirements.
    Section 307(d)(7)(B) of the CAA further provides that ``only an
objection

to a rule or procedure which was raised with reasonable specificity
during the period for public comment (including any public hearing) may
be raised during judicial review.'' This section also provides a
mechanism for EPA to convene a proceeding for reconsideration, ``if the
person raising an objection can demonstrate to EPA that it was
impracticable to raise such objection within [the period for public
comment] or if the grounds for such objection arose after the period
for public comment (but within the time specified for judicial review)
and if such objection is of central relevance to the outcome of the
rule.'' Any person seeking to make such a demonstration to EPA should
submit a Petition for Reconsideration to the Office of the
Administrator, U.S. EPA, Room 3000, Ariel Rios Building, 1200
Pennsylvania Ave., NW., Washington, DC 20460, with a copy to both the
person(s) listed in the FOR FURTHER INFORMATION CONTACT section, and
the Director of the Air and Radiation Law Office, Office of General
Counsel (Mail Code 2344A), U.S. EPA, 1200 Pennsylvania Ave, NW.,
Washington, DC 20004.
    Outline. The information in this preamble is organized as follows:

I. Background
    A. What Is the Source of Authority for Development of NESHAP?
    B. How Did the Public Participate in Developing the Amendments
to the Final Rule?
II. Summary of the Final Amendments
    A. Applicability
    B. Definitions
    C. Emission Standards
    D. Storage Tank Maintenance
    E. Notification and Reporting Requirements
    F. Omissions and Typographical Corrections
III. Significant Comments and Changes Since Proposal
    A. Applicability
    B. Retesting Requirements
    C. Monitoring of pH
    D. Engineering Evaluations
    E. Compliance Date
    F. Planned Maintenance
    G. Work Practice Standards
IV. Impacts of the Final Rule
V. Statutory and Executive Order (EO) Reviews
    A. EO 12866: Regulatory Planning and Review
    B. Paperwork Reduction Act
    C. Regulatory Flexibility Act
    D. Unfunded Mandates Reform Act
    E. EO 13132: Federalism
    F. EO 13175: Consultation and Coordination With Indian Tribal
Governments
    G. EO 13045: Protection of Children From Environmental Health
and Safety Risks
    H. EO 13211: Actions That Significantly Affect Energy Supply,
Distribution, or Use
    I. National Technology Transfer and Advancement Act
    J. Congressional Review Act

I. Background

A. What Is the Source of Authority for Development of NESHAP?

    Section 112 of the CAA requires EPA to list categories and
subcategories of major sources and area sources of hazardous air
pollutants (HAP) and to establish NESHAP for the listed source
categories and subcategories. Hydrochloric acid production and fume
silica production were listed as source categories under the production
of inorganic chemicals group on EPA's initial list of major source
categories published in the Federal Register on July 16, 1992 (57 FR
31576).\1\ On September 18, 2001, we combined these two source
categories for regulatory purposes under the production of inorganic
chemicals group and renamed the source category as HCl production (66
FR 48174). Major sources of HAP are those that have the potential to
emit greater than 9.07 megagrams per year (Mg/yr) (10 tons per year
(tpy)) of any one HAP or 22.68 Mg/yr (25 tpy) of any combination of
HAP.
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    \1\ Later listing notices (e.g., 66 FR 8220) refer to the source
category as ``fumed'' silica.
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B. How Did the Public Participate in Developing the Amendments to the
Final Rule?

    The final rule was published in the Federal Register on April 17,
2003 (68 FR 19076). The final rule contains emission limitations and
standards applicable to HCl and chlorine (Cl2). These limits
apply to each new or existing HCl process vent, HCl storage tank, HCl
transfer operation, and leaks from equipment in HCl service located at
a major source of HAP. Following promulgation of the final rule, EPA
became aware of certain aspects of the applicability provisions,
emission standards, and testing, maintenance, and reporting
requirements that required clarification along with several omissions
and typographical errors in the final rule that required correction. On
August 24, 2005, we published proposed amendments (70 FR 49530) to
address these issues and sought public comment on the proposed
amendments. Today's action finalizes those clarifications and
corrections. The preamble to the proposed amendments discussed the
availability of technical support documents, which described in detail
the information gathered during the standards development process.
    We received four public comment letters on the proposed amendments.
The commenters represent HCl producers and industrial trade
associations. All of the comments have been carefully considered, and,
where appropriate, changes have been made for the amendments to the
final rule.

II. Summary of the Final Amendments

    We are finalizing amendments to 40 CFR part 63, subpart NNNNN, to
change the applicability provisions, to clarify testing, monitoring,
and reporting requirements, and to correct inadvertent omissions and
typographical errors. A summary of each of the amendments to 40 CFR
part 63, subpart NNNNN, and the rationale for each is presented below.

A. Applicability

    In order to avoid regulatory overlap, the HCl Production NESHAP
exempt certain HCl production facilities that are part of other source
categories and subject to other Federal standards. We intended the HCl
Production NESHAP to cover only those HCl production facilities that
were not subject to any other NESHAP and not to cover those HCl
production facilities that were subject to other NESHAP. Today's final
amendments adjust the applicability provisions to rectify three
situations that came to our attention after promulgation of the HCl
Production NESHAP in which this intent was not satisfied.
    First, the final amendments will address the HCl Production
NESHAP's exemptions for HCl production facilities that are subject to
certain other regulations, including 40 CFR part 63, subpart EEE (the
Hazardous Waste Combustors NESHAP), and 40 CFR 266.107, subpart H
(regulations issued under the Resource Conservation and Recovery Act
governing the Burning of Hazardous Wastes in Boilers and Industrial
Furnaces). As worded in the final rule, the exemptions were overly
broad, because neither of the above final rules covers emissions of HCl
from HCl storage tanks, HCl transfer operations, or leaks from
equipment in HCl service at these facilities. This leaves these
emission points not subject to any Federal standards, which was not our
intent. Therefore, we are amending subpart NNNNN of 40 CFR part 63 to
exempt facilities that are subject to subpart EEE of 40 CFR part 63 or
subpart H of 40 CFR part 266 and that meet the applicability
requirements of subpart NNNNN from only the HCl process vent provisions
of subpart NNNNN, rather than from all of the requirements of subpart
NNNNN. Because the purpose of 40 CFR 63.8985(b) and (c) is to provide
exemptions from all of the requirements

of subpart NNNNN for entire HCl production facilities subject to
certain other rules, we are removing 40 CFR 63.8985(b)(4) and (c)(3) to
eliminate the overly broad exemptions and instead are adding new
paragraphs to 40 CFR 63.9000(c) to accomplish the exemptions. The
purpose of 40 CFR 63.9000(c) is to exempt certain emission streams from
subpart NNNNN. Under 40 CFR 63.9000(c), plants that are subject to
subpart EEE of 40 CFR part 63 or subpart H of 40 CFR part 266 and that
meet the other applicability provisions of subpart NNNNN would be
affected sources under subpart NNNNN but would be exempt from the
process vents provisions of subpart NNNNN.
    Second, the amendments revise the HCl Production NESHAP's
exemptions for specific emission streams to eliminate duplicative
regulation. Some emission points that are not themselves subject to
subpart EEE of 40 CFR part 63 have their emissions controlled under
subpart EEE because their emissions are routed directly through
equipment that is subject to subpart EEE (e.g., an HCl process vent
emission stream routed to a hazardous waste combustor (HWC) for use as
supplemental combustion air). Currently, these emissions (e.g., from
the combustor) are regulated by both subpart EEE and subpart NNNNN of
40 CFR part 63. To rectify this situation, we are adding a new
paragraph to 40 CFR 63.9000(c) to include an emission stream-specific
exemption for HCl process vents, HCl storage tanks, and HCl transfer
operations that are routed directly to HWC units subject to subpart
EEE. This means that HCl production facility emission streams that are
routed to subpart EEE HWC units are exempt from the requirements of
subpart NNNNN.
    Finally, the amendments remove the HCl Production NESHAP's
exemption for HCl production facilities subject to 40 CFR 264.343(b),
subpart O (Incinerators), which will no longer be necessary. A
combustor that burns hazardous waste and meets the subpart NNNNN of 40
CFR part 63 definition of an HCl production facility would be defined
as a halogen acid furnace (currently subject to 40 CFR 266.107, subpart
H, and that will be subject to 40 CFR part 63, subpart EEE, on the
compliance date (October 14, 2008) of EPA's final rule promulgated on
October 12, 2005 (70 FR 59402)), not an incinerator (subject to 40 CFR
264.343(b), subpart O). As discussed above, we are amending the
applicability provisions of the HCl Production NESHAP to properly
address HCl production facilities that are subject to 40 CFR part 266,
subpart H. Therefore, the exemption for 40 CFR part 264, subpart O, is
no longer necessary, and we are removing 40 CFR 63.8985(c)(2), which
provided this exemption. Consequently, we are incorporating the
exemption provided in 40 CFR 63.8985(c)(1) into 40 CFR 63.8985(c), and,
thus, removing 40 CFR 63.8985(c)(1).

B. Definitions

    We are clarifying the meaning of ``equipment in HCl service,''
which is defined in the HCl Production NESHAP as ``each pump,
compressor, agitator, pressure relief device, sampling connection
system, open-ended valve or line, valve, connector, and instrumentation
system that contains 30 weight percent or greater of liquid HCl or 5
weight percent or greater of gaseous HCl at any time'' (40 CFR
63.9075). This definition could be interpreted to include equipment
that is located at the same plant site as an ``HCl production
facility'' (40 CFR 63.8985(a)(1)) but is not part of the HCl production
facility. We intended to include only equipment that meets the above
definition and is located within an HCl production facility. Therefore,
we are amending the definition of ``equipment in HCl service'' in 40
CFR 63.9075 to clarify that the definition applies only to equipment
within an HCl production facility.

C. Emission Standards

    The HCl Production NESHAP specify the emission limits for existing
and new HCl process vents, HCl storage tanks, and HCl transfer
operations in two forms--a percent reduction and an outlet
concentration--and allows HCl production facilities to comply with
either one. However, the wording of the emission limits could be
construed to require the use of an add-on control device even when an
emission point meets the outlet concentration emission limit without an
add-on control device. It was not our intent to require add-on control
devices when they are unnecessary for compliance. Although a percent
reduction emission limit would need to be achieved through the use of
an add-on control device, we recognize that an outlet concentration
emission limit could be achieved through other means (e.g., process
changes, pollution prevention). Therefore, we are amending table 1 to
subpart NNNNN of 40 CFR part 63 to clarify that it is not necessary to
use an add-on control device in order to meet the outlet concentration
form of the emission limits. In addition, we are amending tables 3 and
5 to subpart NNNNN to specify the sampling port location and continuous
compliance requirements, respectively, for sources that are not
equipped with an add-on control device. Also, we are amending 40 CFR
63.9015(a) to require that emission points meeting the outlet
concentration limits without the use of a control device conduct
subsequent performance tests when process changes are made that could
reasonably be expected to change the outlet concentration. Finally, we
are amending 40 CFR 63.9050 by adding paragraph (c)(9), which specifies
that compliance reports must include verification that no process
changes that could reasonably be expected to change the outlet
concentration have been made since the last performance test.

D. Storage Tank Maintenance

    The HCl Production NESHAP are silent on the issue of how
maintenance is to be conducted on HCl storage tank control devices.
This could lead to uncertainty over whether an HCl storage tank would
need to be emptied before the associated control device could be
disconnected for maintenance purposes. It was not our intent that an
HCl storage tank would need to be emptied prior to maintenance because
the standing losses associated with a full or partially-full HCl
storage tank are low, when compared to the emissions that occur from
filling and emptying the tank. To clarify our intent, we are amending
40 CFR 63.9000, by adding paragraph (d), to allow HCl production
facilities to perform planned routine maintenance on each HCl storage
tank control device for up to 240 hours per year without emptying the
contents of the tank. During this time, the storage tank emission
limitations would not apply. Also, we are amending 40 CFR 63.9050, by
adding paragraph (c)(10), and 40 CFR 63.9055, by adding paragraph
(b)(6), to specify the reporting and recordkeeping requirements for
planned routine maintenance events. These provisions are consistent
with other NESHAP to which plant sites containing HCl production
facilities may be subject.

E. Notification and Reporting Requirements

1. Notification of Compliance Status
    The HCl Production NESHAP require the submission of a Notification
of Compliance Status (NOCS) to the Administrator when a performance
test is conducted (40 CFR 63.9045(a), table 7 to subpart NNNNN of 40
CFR part 63, and 40 CFR 63.9(h)). It could be interpreted that 40 CFR
63.9045(e) and (f) require the submission of a separate NOCS for each
performance test that is conducted (e.g., on each emission

point). It is more efficient and no less effective for HCl production
facilities to submit one NOCS for the entire affected source, rather
than one NOCS for each emission point tested, and it was not our intent
to require unnecessary paperwork. Therefore, we are amending 40 CFR
63.9045 to change the submission procedures for NOCS. We will allow
NOCS to be submitted within 240 calendar days of the compliance dates
for subpart NNNNN of 40 CFR part 63. The final amendments allow for the
submission of only one NOCS per affected source because the
notification is due 60 days after all performance tests are required to
be conducted. We are also amending table 7 to subpart NNNNN to reflect
this change to the NOCS submission procedures.
2. Monitoring and Leak Detection and Repair (LDAR) Plans
    The HCl Production NESHAP require submission of the initial site-
specific monitoring (40 CFR 63.9005(d)) and LDAR (LDAR; table 1 to
subpart NNNNN of 40 CFR part 63) plans to the Administrator with a
source's NOCS. The final rule does not, however, specify when or how
revisions to these plans should be submitted, only that they should be
submitted (40 CFR 63.9055(b)(5)). Submission of revisions to these
plans is most efficiently done in conjunction with the semi-annual
compliance report required by 40 CFR 63.9050. Therefore, we are
amending 40 CFR 63.9050(c) by adding paragraph (c)(8) to require
submission of revisions to site-specific monitoring plans and LDAR
plans with semi-annual compliance reports, if revisions have been made
during the reporting period.

F. Omissions and Typographical Corrections

    We are adding an exemption which was inadvertently omitted from the
HCl Production NESHAP. In the preamble to the final rule (68 FR 19082),
we indicated that we would include an exemption for HCl production
facilities subject to 40 CFR 63.994, subpart SS. Because this exemption
was not included in the final rule text, we are amending the rule to
include it. Because we are removing 40 CFR 63.8985(b)(4), we are
replacing it with the exemption for 40 CFR 63.994, subpart SS.
    We are removing the phrase ``/Cl2'' from 40 CFR
63.8990(b)(4) to reflect a change made between the proposed rule and
the final rule which was retained incorrectly in the final rule. The
proposed rule used the term ``in HCl/Cl2 service,'' but we
wrote this term as ``equipment in HCl service'' in the final rule. We
are making the same change in the first column of table 1, item 4, to
subpart NNNNN of 40 CFR part 63.
    We are correcting an inaccurate reference in 40 CFR 63.9025(a)
regarding operating parameters. The reference should be to 40 CFR
63.9020(e), which requires operating parameters to be established,
rather than to 40 CFR 63.9020(d). This was a typographical error in the
final rule.
    We are correcting an inaccurate reference in the definition of
``HCl production facility'' in 40 CFR 63.9075. The reference to 40 CFR
63.8985(a)(i) should be to 40 CFR 63.8985(a)(1) because 40 CFR
63.8985(a)(i) does not exist. This was a typographical error in the
final rule.

III. Significant Comments and Changes Since Proposal

    This section includes discussion of the significant comments
received on the proposed amendments, particularly where we made changes
to address those comments in the amendments to the final rule. For a
complete summary of all the comments received on the proposed rule and
our responses to them, refer to the ``RESPONSE TO SIGNIFICANT PUBLIC
COMMENTS Received in response to Proposed amendments to National
Emission Standards for Hazardous Air Pollutants: Hydrochloric Acid
Production'' in Docket ID No. EPA-HQ-OAR-2002-0057. The docket also
contains the actual comment letters and supporting documentation
developed for the final amendments.

A. Applicability

    Comment: One commenter recommends that EPA need not include
proposed 40 CFR 63.9000(c)(4) as proposed 40 CFR 63.9000(c)(5) is more
inclusive and includes the conditions addressed in 40 CFR
63.9000(c)(4).
    Response: EPA agrees with the concept put forward by the commenter
and has reworded paragraph (c)(4) to encompass the language proposed in
paragraphs (c)(4), (c)(5), and (c)(6).

B. Retesting Requirements

    Comment: Two commenters request that EPA clarify the change
provisions in proposed 40 CFR 63.9015(a) to explain that the provisions
to retest process vent emissions should be tied to a change that could
cause an increase in emissions rather than, as currently worded,
``whenever process changes are made that could reasonably be expected
to change the outlet concentration.'' A similar change was requested to
the language in 40 CFR 63.9050(c)(9).
    Response: EPA agrees with the commenters and has made the suggested
changes. This language is consistent with other rulemaking actions.
    Comment: One commenter requests that EPA define ``temporary process
changes,'' in proposed 40 CFR 63.9015(a) to be changes of less than 1
year in duration where the owner/operator believes that the source will
continue to demonstrate compliance without changing the compliance
demonstration method.
    Response: EPA disagrees with the commenter. As mentioned in the
previous response, without emissions test data, no one can determine
the effect of a change--temporary or not--on an existing facility.
Moreover, the commenter errs by excluding the term ``unintentional'' in
discussing ``temporary process changes.'' As written, the final rule
identifies ``unintentional, temporary process changes'' (emphasis
added) as not being process changes. Surely a process change lasting up
to 1 year could not be considered unintentional. Absent any information
as to the length of time ``unintentional temporary'' process changes
should or could last, we have not revised the final rule.

C. Monitoring of pH

    Comment: One commenter believes that the requirement to measure the
pH of the scrubber water as provided in 40 CFR 63.9020(e)(1) and Table
5 to subpart NNNNN is an inappropriate operational parameter and should
be removed from the final rule. The commenter believes that monitoring
the water flow of the scrubber is a sufficient measurement of scrubber
performance, as seen during performance testing. The Pesticide Active
Ingredient Production NESHAP (40 CFR 63.1366(b)(ii)) allows for either
minimum liquid flow rate or pressure drop to be chosen as operating
parameters during the period in which the scrubber is controlling HAP
from an emission stream and only requires the measurement of pH if a
caustic scrubber is being used. The commenter believes that a rule
change is more efficient than going through the alternative monitoring
request process.
    Response: EPA disagrees with the commenter's suggestion to replace
monitoring of the scrubber water effluent pH with monitoring of the
minimum liquid flow rate or pressure drop only. Apart from directly
measuring HCl emissions, monitoring of the outlet pH of the scrubber
water, as well as the water flow rate into the scrubber, provides the
most complete depiction of parametric monitoring and best measure for
process control. Parametric monitoring that provides a less certain
depiction, and

corresponding level of process control, would include scrubber water
outlet pH monitoring and flow monitoring. The least-certain depiction,
and corresponding level of process control, would arise from monitoring
only the scrubber water flow. Although such least-certain monitoring
may be appropriate under certain circumstances, sources subject to the
HCl production NESHAP may rely on techniques other than once-through
scrubber water use. In order not to prescribe any control technique,
source owners or operators are able to choose an approach that works
best for them. The Pesticide NESHAP cited by the commenter differs from
the HCl NESHAP and what is applicable for sources subject to the
Pesticide NESHAP may not be relevant for sources subject to the HCl
Production NESHAP. Further, the commenter fails to note that other
standards that regulate HCl emissions require the monitoring of
effluent pH. A more comparable example is that of 40 CFR part 63,
subpart EEE, National Emission Standards for Hazardous Air Pollutants
for Hazardous Waste Combustors. In this NESHAP, where the HCl
production process is very similar to that of the HCl Production
NESHAP, monitoring of effluent pH is required whenever a wet scrubber,
water or caustic, is used (40 CFR 63.1209(o)(3)(iv)).
    EPA is unaware of any difficulty faced by source owners or
operators subject to the HCl Production NESHAP in getting approval for
alternative monitoring as suggested by the commenter. In fact, at least
two HCl Production NESHAP source owners/operators have demonstrated a
need for an alternative monitoring technique, requested approval for
such technique, and received approval for that technique by the
Regional offices.

D. Engineering Evaluations

    Comment: Two commenters request that the provision allowing the use
of engineering evaluations in lieu of emission testing, as proposed in
40 CFR 9020(e)(3), be amended to include process vents as well as the
currently proposed allowance for storage tanks and transfer operations.
The commenters note that EPA has historically allowed such assessments
for process vents in other NESHAP (e.g., 40 CFR 63.1258(b)(3)(i); 40
CFR 63.1365(c)(3)(i)(A); 40 CFR 63.1426(f)) and continues to support
the use of design evaluations (40 CFR 63.2450(h)).
    Response: EPA disagrees with the commenters' suggestion. The
standards cited by the commenters all deal primarily with organic HAP,
with HCl occurring in more limited quantities, as opposed to the
primacy of HCl emissions encountered in the HCl Production NESHAP. The
commenters provide no data to support their contention about use of
engineering evaluations in lieu of emissions testing for HCl and
Cl2 for the process vents. Design values as supplied by such
engineering evaluations may be appropriate for small emitters (i.e.,
those below the NESHAP applicability level) as was done for at least
some of the cited NESHAP, but substantial, uncontrolled emissions ``
such as those that could come from process vents--should be measured.
    Again, EPA feels that a more comparable example is the Hazardous
Waste Combustor NESHAP (40 CFR part 63, subpart EEE). In this standard
(40 CFR 63.1207(m)), conservative engineering evaluations are allowed
in lieu of emissions testing for sources that can comply with the
emission standards assuming all chlorine in the feed is emitted as
total chlorine (HCl + Cl2)--if the maximum theoretical
emission concentration does not (cannot) exceed the emission standards,
emissions testing is waived. However, HCl production furnaces could not
comply with this waiver of the emission test because they rely on wet
scrubbers/absorbers to produce HCl product and control emissions of
HCl/Cl2. We believe this situation is analogous to that
encountered in the HCl Production NESHAP where we have allowed
engineering evaluations to be utilized for those emission sources that
could possibly emit below the emission standard (i.e., the storage
tanks and transfer operations) but have required emission testing for
the emission sources that are not likely to emit below the standard
without the use of a control device (i.e., the process vents).

E. Compliance Date

    Comment: Two commenters request that EPA clarify the deadline for
compliance with the final rule and the dates when the initial reports
are due in 40 CFR 63.9050(b)(1) and (2), believing that there could be
confusion among the various entities affected by the rule concerning
the submittal date for the first compliance report. They suggest that
the rule language specifically state that January 31, 2007, is the date
on which the first compliance report is due.
    Response: EPA agrees that the wording could be confusing and has
added clarification to the language of the regulation to indicate that,
for sources in existence on April 17, 2006, the initial compliance
period ends June 30, 2006, and the initial compliance report is due on
July 31, 2006.

F. Planned Maintenance

    Comment: Two commenters expressed concern about the planned
maintenance advance notification requirements in proposed 40 CFR
63.9050(c)(10)(ii) in that planned maintenance schedules are subject to
change with little or no notice. One of the commenters believes that a
facility could, in good faith, report advance plans of maintenance to
the permit authority and EPA but then, due to an unforeseen change of
plans, not conduct the planned maintenance on the proposed schedule or
identify additional, required work that was not in the maintenance
plan. The commenter believes that EPA should not establish a regulation
where a decision is required to respond to plant-specific conditions
that have no impact on emissions becomes a regulatory enforcement
matter. The commenter believes that EPA already has sufficient
authority through the existing startup, malfunction, and shutdown (SSM)
provisions to review such maintenance activities without requiring the
additional reporting required by 40 CFR 63.9050(c)(10)(ii). The other
commenter requests that tracking of compliance with any needed
notification requirements only be included in the required periodic
reports (as proposed in 40 CFR 63.9050(c)(10)(i)) or that such
reporting not be required unless a deviation of a monitoring condition
or an exceedances of an emission limit occurs during the periodic
reporting period. One commenter believes that the proposed requirement
is overly burdensome and unnecessary. Further, the commenter states
that it is not aware of any other NESHAP that requires advance
reporting of anticipated planned routine maintenance activities on
emission control devices.
    Response: EPA disagrees with the commenters. In adding this
requirement, EPA was responding to concerns that the rule language was
unclear on whether an HCl storage tank would need to be emptied before
the associated control device could be disconnected for maintenance
purposes. In the proposed amendments to the final rule, EPA provided
language that allowed owners/operators to perform maintenance on each
HCl storage tank for up to 240 hours per year without emptying the
storage tank. During this period, the storage tank emissions would not
apply. The notification requirement was included to ensure that the
recipient of the periodic reports is

aware of planned maintenance activities related to the HCl storage
tanks, including the type of maintenance to be performed and the
duration of the maintenance (which would be the length of time during
which the emission standards would not apply). Further, EPA does not
believe that an out-of-compliance period should suddenly become a
``maintenance period.'' EPA does not see the dilemma the commenters
believe themselves subject to. If a planned maintenance period does not
occur, EPA sees no harm or liability for having reported it. EPA
recognizes that planned maintenance activities may, on occasion, not
occur as scheduled. In cases where an owner/operator had included
planned maintenance in a periodic report but the maintenance did not
occur, EPA would expect that the owner/operator would merely explain
the situation in the next periodic report. EPA understands that
occasionally additional unplanned maintenance needs are discovered in
the course of a planned maintenance and believes that the regulations
are sufficiently flexible to accommodate such circumstances. EPA
believes that 240 hours is sufficient time to effect maintenance on HCl
storage tank control devices. However, should planned maintenance on
such devices require 240 or greater hours per year, the owner/operator
would be required to drain the HCl storage tank or comply with the
emission limits without the control device in-place.

G. Work Practice Standards

    Comment: One commenter expressed concern about changes made to item
4 in table 1 to subpart NNNNN where the term ``and new'' sources was
added to the existing language. The commenter believes that this change
was not discussed in the preamble to the proposed amendments and that
this addition significantly broadens the impact of the rule and should
be justified.
    Response: Item 4 in table 1 to subpart NNNNN only addressed leaking
equipment at existing sources. EPA acknowledges that it was an
oversight in the regulatory language in the final rule to omit leaking
equipment at new sources and, so as a technical correction, added ``and
new'' to the language of item 4 in the proposed amendments. The text of
the final rule preamble related to the emission limitations and work
practice standards (68 FR 19079) provides discussion for process vents,
storage tanks, and transfer operations at both new and existing
sources. However, for leaking equipment, the text only states ``[f]or
leaking equipment, the final rule includes a work practice standard.''
EPA believes that the lack of distinction between leaking equipment at
new and existing sources is indication that the final rule applies to
both situations. EPA sees no reason to omit new sources from having to
address leaking equipment and does not agree with the commenter's
concern about this adjustment ``significantly'' broadening the impact
of the final rule.

IV. Impacts of the Final Rule

    The changes incorporated as a result of the final rule amendments
do not change any of the impacts presented in the preamble to the final
rule which was published at 68 FR 19076 (April 17, 2003).

V. Statutory and Executive Order (EO) Reviews

A. EO 12866: Regulatory Planning and Review

    Under EO 12866 (58 FR 51735; October 4, 1993), EPA must determine
whether the regulatory action is ``significant'' and, therefore,
subject to review by the Office of Management and Budget (OMB) and the
requirements of the EO. The EO defines a ``significant regulatory
action'' as one that is likely to result in a rule that may:
    (1) Have an annual effect on the economy of $100 million or more or
adversely affect in a material way the economy, a sector of the
economy, productivity, competition, jobs, the environment, public
health or safety, or State, local, or tribal governments or
communities;
    (2) Create a serious inconsistency or otherwise interfere with an
action taken or planned by another agency;
    (3) Materially alter the budgetary impact of entitlement, grants,
user fees, or loan programs or the rights and obligations of recipients
thereof; or
    (4) Raise novel legal or policy issues arising out of legal
mandates, the President's priorities, or the principles set forth in
the EO.
    It has been determined that today's action is not a ``significant
regulatory action'' under the terms of EO 12866 and is, therefore, not
subject to OMB review.

B. Paperwork Reduction Act

    OMB has approved the information collection requirements in the
2003 NESHAP for HCl production under the requirements of the Paperwork
Reduction Act, 44 U.S.C. 3501 et seq., and has assigned OMB control
number 2060-0529. At proposal, EPA prepared a revision to the currently
approved information collection request (ICR), and made it available
for public comment. Most of the final rule amendments are not expected
to have an impact on the ICR burden. However, the ICR was revised
because two of the final rule amendments are expected to change the
burden slightly. The exemption for individual emission streams that are
routed to 40 CFR part 63, subpart EEE, hazardous waste combustors is
expected to decrease the reporting and recordkeeping burden for some
sources. The routine maintenance allowance is expected to increase the
reporting and recordkeeping burden for all sources. Overall, the total
annual reporting and recordkeeping burden is expected to be 733 hours
(1 percent) lower than for the final rule. No comments were received on
the revised ICR or burden estimates.
    Burden means the total time, effort, or financial resources
expended by persons to generate, maintain, retain, or disclose or
provide information to or for a Federal agency. This includes the time
needed to review instructions; develop, acquire, install, and utilize
technology and systems for the purposes of collecting, validating, and
verifying information, processing and maintaining information, and
disclosing and providing information; adjust the existing ways to
comply with any previously applicable instructions and requirements;
train personnel to be able to respond to a collection of information;
search data sources; complete and review the collection of information;
and transmit or otherwise disclose the information.
    An Agency may not conduct or sponsor, and a person is not required
to respond to a collection of information unless it displays a
currently valid OMB control number. The OMB control numbers for EPA's
regulations are listed in 40 CFR part 9 and 40 CFR chapter 15.

C. Regulatory Flexibility Act

    EPA has determined that it is not necessary to prepare a regulatory
flexibility analysis in connection with today's action.
    For purposes of assessing the impacts of today's amendments on
small entities, small entity is defined as (1) a small business as
defined by the Small Business Administration's regulations at 13 CFR
121.202; (2) a small governmental jurisdiction that is a government of
a city, county, town, school district, or special district with a
population of less than 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. The small

business size standard for the affected industries (NAICS 325181,
Alkalies and Chlorine Manufacturing; and NAICS 325188, All Other Basic
Inorganic Chemical Manufacturing) is a maximum of 1,000 employees for
an entity.
    After considering the economic impacts of today's final rule
amendments on small entities, EPA has concluded that today's action
will not have a significant economic impact on a substantial number of
small entities. The final rule amendments will not impose any
requirements on small entities.

D. Unfunded Mandates Reform Act

    Title II of the Unfunded Mandates Reform Act of 1995 (UMRA), Public
Law 104-4, establishes requirements for Federal agencies to assess the
effects of their regulatory actions on State, local, and Tribal
governments and the private sector. Under UMRA section 202, EPA
generally must prepare a written statement, including a cost-benefit
analysis, for proposed and final rules with ``Federal mandates'' that
may result in expenditures by State, local, and Tribal governments, in
the aggregate, or by the private sector, of $100 million or more in any
1 year. Before promulgating an EPA rule for which a written statement
is needed, UMRA section 205 generally requires EPA to identify and
consider a reasonable number of regulatory alternatives and adopt the
least costly, most cost-effective, or least burdensome alternative that
achieves the objectives of the rule. The provisions of UMRA section 205
do not apply when they are inconsistent with applicable law. Moreover,
UMRA section 205 allows EPA to adopt an alternative other than the
least-costly, most cost-effective, or least burdensome alternative if
the Administrator publishes with the final rule an explanation why that
alternative was not adopted. Before EPA establishes any regulatory
requirements that may significantly or uniquely affect small
governments, including Tribal governments, it must have developed under
UMRA section 203 a small government agency plan. The plan must provide
for notifying potentially affected small governments, enabling
officials of affected small governments to have meaningful and timely
input in the development of EPA regulatory proposals with significant
Federal intergovernmental mandates, and informing, educating, and
advising small governments on compliance with the regulatory
requirements.
    Today's final amendments contain no Federal mandates (under the
regulatory provisions of title II of the UMRA) for State, local, or
Tribal governments. EPA has determined that the final amendments do not
contain a Federal mandate that may result in expenditures of $100
million or more for State, local, and Tribal governments, in the
aggregate, or the private sector in any 1 year. Thus, today's final
amendments are not subject to the requirements of UMRA sections 202 and
205.

E. EO 13132: Federalism

    Executive Order 13132 (64 FR 43255; August 10, 1999) requires EPA
to develop an accountable process to ensure ``meaningful and timely
input by State and local officials in the development of regulatory
policies that have federalism implications.'' ``Policies that have
federalism implications'' is defined in the EO to include regulations
that 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.''
    The final rule amendments do not have federalism implications. They
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 EO 13132. None of the affected facilities
are owned or operated by State governments. Thus, EO 13132 does not
apply to the final amendments.

F. EO 13175: Consultation and Coordination With Indian Tribal
Governments

    Executive Order 13175 (65 FR 67249; November 6, 2000) requires EPA
to develop an accountable process to ensure ``meaningful and timely
input by Tribal officials in the development of regulatory policies
that have Tribal implications.'' The final rule amendments do not have
Tribal implications, as specified in EO 13175. They 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. No Tribal governments own facilities
subject to the HCl Production NESHAP. Thus, EO 13175 does not apply to
the final amendments.

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

    EO 13045 (62 FR 19885; April 23, 1997) applies to any rule that:
(1) Is determined to be ``economically significant'' as defined under
EO 12866, and (2) concerns an environmental health or safety risk that
EPA has reason to believe may have a disproportionate effect on
children. If the regulatory action meets both criteria, EPA must
evaluate the environmental health or safety effects of the planned rule
on children, and explain why the planned regulation is preferable to
other potentially effective and reasonably feasible alternatives
considered by the Agency. EPA interprets EO 13045 as applying only to
regulatory actions that are based on health or safety risks, such that
the analysis required under section 5-501 of the EO has the potential
to influence the regulation. The final rule amendments are not subject
to EO 13045 because they are based on technology performance and not on
health or safety risks.

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

    Today's action is not subject to EO 13211, ``Actions Concerning
Regulations That Significantly Affect Energy Supply, Distribution, or
Use'' (66 FR 28355; May 22, 2001) because it is not a significant
regulatory action under EO 12866.

I. National Technology Transfer and Advancement Act

    As stated in the proposed rule, section 12(d) of the National
Technology Transfer and Advancement Act (NTTAA) of 1995 (Pub. L. 104-
113; 15 U.S.C 272 note), directs EPA to use voluntary consensus
standards in their regulatory and procurement activities unless to do
so would be inconsistent with applicable law or otherwise
impracticable. Voluntary consensus standards are technical standards
(such as material specifications, test methods, sampling procedures, or
business practices) developed or adopted by one or more voluntary
consensus bodies. The NTTAA directs EPA to provide Congress, through
OMB, explanations when the Agency decides not to use available and
applicable voluntary consensus standards. The final rule amendments do
not involve changes to the technical standards in the final rule.
Therefore, EPA is not considering the use of any voluntary consensus
standards in the final amendments.

J. Congressional Review Act

    The Congressional Review Act (CRA), 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 my 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.
EPA will submit a report containing the final rule amendments 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 final rule amendments in the Federal Register. A
major rule cannot take effect until 60 days after it is published in
the Federal Register. The final rule amendments are not a ``major
rule'' as defined by 5 U.S.C. 804(2). The final rule amendments will be
effective April 7, 2006.

List of Subjects in 40 CFR Part 63

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

    Dated: March 31, 2006.
Stephen L. Johnson,
Administrator.

0
For the reasons set forth in the preamble, title 40, chapter I, part 63
of the Code of Federal Regulations is amended as follows:

PART 63--[AMENDED]

0
1. The authority citation for part 63 continues to read as follows:

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

Subpart NNNNN--[Amended]

0
2. Section 63.8985 is amended by revising paragraphs (b)(4) and (c) to
read as follows:

Sec.  63.8985  Am I subject to this subpart?

* * * * *
    (b) * * *
    (4) 40 CFR part 63, section 63.994, subpart SS, National Emission
Standards for Closed Vent Systems, Control Devices, Recovery Devices
and Routing to a Fuel Gas System or a Process.
* * * * *
    (c) An HCl production facility is not subject to this subpart if it
is located following the incineration of chlorinated waste gas streams,
waste liquids, or solid wastes, and the emissions from the HCl
production facility are subject to section 63.113(c), subpart G,
National Emission Standards for Organic Hazardous Air Pollutants from
the Synthetic Organic Chemical Manufacturing Industry for Process
Vents, Storage Vessels, Transfer Operations, and Wastewater.
* * * * *

0
3. Section 63.8990 is amended by revising paragraph (b)(4) to read as
follows:

Sec.  63.8990  What parts of my plant does this subpart cover?

* * * * *
    (b) * * *
    (4) Each emission stream resulting from leaks from equipment in HCl
service.
* * * * *

0
4. Section 63.9000 is amended by:
0
a. Revising paragraph (a);
0
b. Revising the introductory text of paragraph (c);
0
c. Adding paragraph (c)(4); and
0
d. Adding paragraph (d).

Sec.  63.9000  What emission limitations and work practice standards
must I meet?

    (a) With the exceptions noted in paragraphs (c) and (d) of this
section, you must meet the applicable emission limit and work practice
standard in table 1 to this subpart for each emission stream listed
under Sec.  63.8990(b)(1) through (4) that is part of your affected
source.
* * * * *
    (c) The emission streams listed in paragraphs (c)(1) through (4) of
this section are exempt from the emission limitations, work practice
standards, and all other requirements of this subpart.
* * * * *
    (4) Emission streams from HCl process vents, HCl storage tanks, and
HCl transfer operations that are also subject to 40 CFR part 63,
subpart EEE, National Emission Standards for Hazardous Air Pollutants
for Hazardous Waste Combustors, or 40 CFR 266.107, subpart H, Burning
of Hazardous Waste in Boilers and Industrial Furnaces.
    (d) The emission limits for HCl storage tanks in table 1 to this
subpart do not apply during periods of planned routine maintenance of
HCl storage tank control devices. Periods of planned routine
maintenance of each HCl storage tank control device, during which the
control device does not meet the emission limits specified in table 1
to this subpart, shall not exceed 240 hours per year.

0
5. Section 63.9015 is amended by revising paragraph (a) to read as
follows:

Sec.  63.9015  When must I conduct subsequent performance tests?

    (a) You must conduct all applicable performance tests according to
the procedures in Sec.  63.9020 on the earlier of your title V
operating permit renewal or within 5 years of issuance of your title V
permit. For emission points meeting the outlet concentration limits in
table 1 to this subpart without the use of a control device, all
applicable performance tests must also be conducted whenever process
changes are made that could reasonably be expected to increase the
outlet concentration. Examples of process changes include, but are not
limited to, changes in production capacity, production rate, feedstock
type, or catalyst type, or whenever there is replacement, removal, or
addition of recovery equipment. For purposes of this paragraph, process
changes do not include: process upsets and unintentional, temporary
process changes.
* * * * *

0
6. Section 63.9025 is amended by revising the introductory text of
paragraph (a) to read as follows:

Sec.  63.9025  What are my monitoring installation, operation, and
maintenance requirements?

    (a) For each operating parameter that you are required by Sec.
63.9020(e) to monitor, you must install, operate, and maintain each CMS
according to the requirements in paragraphs (a)(1) through (6) of this
section.
* * * * *

0
7. Section 63.9045 is amended by:
0
a. Removing and reserving paragraph (e); and
0
b. Revising paragraph (f).

Sec.  63.9045  What notifications must I submit and when?

* * * * *
    (e) [Reserved]
    (f) You must submit the Notification of Compliance Status,
including the performance test results, within 240 calendar days after
the applicable compliance dates specified in Sec.  63.8995.
* * * * *

0
8. Section 63.9050 is amended by:
0
a. Revising paragraphs (b)(1) and (2);
0
b. Revising the introductory text of paragraph (c); and
0
c. Adding paragraphs (c)(8) through (c)(10).

Sec.  63.9050  What reports must I submit and when?

* * * * *
    (b) * * *
    (1) The first compliance report must cover the period beginning on
the compliance date that is specified for your affected source in Sec.
63.8995 and ending on June 30 or December 31, whichever date is the
first date

following the end of the first calendar half after the compliance date
that is specified for your source in Sec.  63.8995 (i.e., June 30,
2006, for sources existing on April 17, 2006).
    (2) The first compliance report must be postmarked or delivered no
later than July 31 or January 31, whichever date follows the end of the
first calendar half after the compliance date that is specified for
your affected source in Sec.  63.8995 (i.e., July 31, 2006, for sources
existing on April 17, 2006).
* * * * *
    (c) The compliance report must contain the following information in
paragraphs (c)(1) through (10) of this section.
* * * * *
    (8) If you did not make revisions to your site-specific monitoring
plan and/or LDAR plan during the reporting period, a statement that you
did not make any revisions to your site-specific monitoring plan and/or
LDAR plan during the reporting period. If you made revisions to your
site-specific monitoring plan and/or LDAR plan during the reporting
period, a copy of the revised plan.
    (9) If you meet the outlet concentration limit in table 1 to this
subpart without the use of a control device for any emission point,
verification that you have not made any process changes that could
reasonably be expected to increase the outlet concentration since your
most recent performance test for that emission point.
    (10) The information specified in paragraphs (c)(10)(i) and (ii) of
this section for those planned routine maintenance operations that
caused or may cause an HCl storage tank control device not to meet the
emission limits in table 1 to this subpart, as applicable.
    (i) A description of the planned routine maintenance that was
performed for each HCl storage tank control device during the reporting
period. This description shall include the type of maintenance
performed and the total number of hours during the reporting period
that the HCl storage tank control device did not meet the emission
limits in table 1 to this subpart, as applicable, due to planned
routine maintenance.
    (ii) A description of the planned routine maintenance that is
anticipated to be performed for each HCl storage tank control device
during the next reporting period. This description shall include the
type of maintenance necessary, planned frequency of maintenance, and
lengths of maintenance periods.
* * * * *

0
9. Section 63.9055 is amended by adding paragraph (b)(6) to read as
follows:

Sec.  63.9055  What records must I keep?

* * * * *
    (b) * * *
    (6) Records of the planned routine maintenance performed on each
HCl storage tank control device including the duration of each time the
control device does not meet the emission limits in table 1 to this
subpart, as applicable, due to planned routine maintenance. Such a
record shall include the information specified in paragraphs (b)(6)(i)
and (ii) of this section.
    (i) The first time of day and date the emission limits in table 1
to this subpart, as applicable, were not met at the beginning of the
planned routine maintenance, and
    (ii) The first time of day and date the emission limits in table 1
to this subpart, as applicable, were met at the conclusion of the
planned routine maintenance.

0
10. Section 63.9075 is amended by revising the definitions of
``Equipment in HCl service'' and ``HCl production facility'' to read as
follows:

Sec.  63.9075  What definitions apply to this subpart?

* * * * *
    Equipment in HCl service means each pump, compressor, agitator,
pressure relief device, sampling connection system, open-ended valve or
line, valve, connector, and instrumentation system in an HCl production
facility that contains 30 weight percent or greater of liquid HCl or 5
weight percent or greater of gaseous HCl at any time.
* * * * *
    HCl production facility is defined in Sec.  63.8985(a)(1).
* * * * *

0
11. Table 1 in subpart NNNNN is revised to read as follows:

 Table 1 to Subpart NNNNN of Part 63.--Emission Limits and Work Practice
                                Standards
   [As stated in Sec.   63.9000(a), you must comply with the following
  emission limits and work practice standards for each emission stream
                   that is part of an affected source]
------------------------------------------------------------------------
                                         You must meet the following
           For each . . .              emission limit and work practice
                                                   standard
------------------------------------------------------------------------
1. Emission stream from an HCl       a. Reduce HCl emissions by 99
 process vent at an existing source.  percent or greater or achieve an
                                      outlet concentration of 20 ppm by
                                      volume or less; and
                                     b. Reduce Cl2 emissions by 99
                                      percent or greater or achieve an
                                      outlet concentration of 100 ppm by
                                      volume or less.
2. Emission stream from an HCl       Reduce HCl emissions by 99 percent
 storge tank at an existing source.   or greater or achieve an outlet
                                      concentration of 120 ppm by volume
                                      or less.
3. Emission stream from an HCl       Reduce HCl emissions by 99 percent
 transfer operation at an existing    or greater or achieve an outlet
 source.                              concentration of 120 ppm by volume
                                      or less.
4. Emission stream from leaking      a. Prepare and operate at all times
 equipment in HCl service at          according to an equipment LDAR
 existing and new sources.            plan that describes in detail the
                                      measures that will be put in place
                                      to detect leaks and repair them in
                                      a timely fashion; and
                                     b. Submit the plan to the
                                      Administrator for comment only
                                      with your Notification of
                                      Compliance Status; and
                                     c. You may incorporate by reference
                                      in such plan existing manuals that
                                      describe the measures in place to
                                      control leaking equipment
                                      emissions required as part of
                                      other federally enforceable
                                      requirements, provided that all
                                      manuals that are incorporated by
                                      reference are submitted to the
                                      Administrator.
5. Emission stream from an HCl       a. Reduce HCl emissions by 99.4
 process vent at a new source.        percent or greater or achieve an
                                      outlet concentration of 12 ppm by
                                      volume or less; and
                                     b. Reduce Cl2 emissions by 99.8
                                      percent or greater or achieve an
                                      outlet concentration of 20 ppm by
                                      volume or less.
6. Emission stream from an HCl       Reduce HCl emissions by 99.9
 storage tank at a new source.        percent or greater or achieve an
                                      outlet concentration of 12 ppm by
                                      volume or less.

7. Emission stream from an HCl       Reduce HCl emissions by 99 percent
 transfer operation at a new source.  or greater or achieve an outlet
                                      concentration of 120 ppm by volume
                                      or less.
------------------------------------------------------------------------

0
12. Table 3 in subpart NNNNN is revised to read as follows:

 Table 3 to Subpart NNNNN of Part 63.--Performance Test Requirements for
                     HCl Production Affected Sources
    [As stated in Sec.   63.9020, you must comply with the following
 requirements for performance tests for HCl production for each affected
                                 source]
------------------------------------------------------------------------
 For each HCl process vent and
 each HCl storage tank and HCl
 transfer operation for which                            Additional
     you are conducting a          Using . . .       Information . . .
performance test, you must . .
               .
------------------------------------------------------------------------
1. Select sampling port         a. Method 1 or 1A  i. If complying with
 location(s) and the number of   in appendix A to   a percent reduction
 traverse points.                40 CFR part 60     emission limitation,
                                 of this chapter.   sampling sites must
                                                    located at the inlet
                                                    and outlet of the
                                                    control device prior
                                                    to any releases to
                                                    the atmosphere (or,
                                                    if a series of
                                                    control devices are
                                                    used, at the inlet
                                                    of the first control
                                                    device and at the
                                                    outlet of the final
                                                    control device prior
                                                    to any releases to
                                                    the atmosphere); or
                                                   ii. If complying with
                                                    an outlet
                                                    concentration
                                                    emission limitation,
                                                    the sampling site
                                                    must be located at
                                                    the outlet of the
                                                    final control device
                                                    and prior to any
                                                    releases to the
                                                    atmosphere or, if no
                                                    control device is
                                                    used, prior to any
                                                    releases to the
                                                    atmosphere.
2. Determine velocity and       Method 2, 2A, 2C,  .....................
 volumetric flow rate.           2D, 2F, or 2G in
                                 appendix A to 40
                                 CFR part 60 of
                                 this chapter.
3. Determine gas molecular      a. Not applicable  i. Assume a molecular
 weight.                                            weight of 29 (after
                                                    moisture correction)
                                                    for calculation
                                                    purposes.
4. Measure moisture content of  Method 4 in        .....................
 the stack gas.                  appendix A to 40
                                 CFR part 60 of
                                 this chapter.
5. Measure HCl concentration    a. Method 26A in   i. An owner or
 and Cl2 concentration from      appendix A to 40   operator may be
 HCl process vents.              CFR part 60 of     exempted from
                                 this chapter.      measuring the Cl2
                                                    concentration from
                                                    an HCl process vent
                                                    provided that a
                                                    demonstration that
                                                    Cl2 is not likely to
                                                    be present in the
                                                    stream is submitted
                                                    as part of the site-
                                                    specific test plan
                                                    required by Sec.
                                                    63.9020(a)(2). This
                                                    demonstration may be
                                                    based on process
                                                    knowledge,
                                                    engineering
                                                    judgment, or
                                                    previous test
                                                    results.
6. Establish operating limits                      .....................
 with which you will
 demonstrate continuous
 compliance with the emission
 limits in Table 1 to this
 subpart, in accordance with
 Sec.   63.9020(e)(1) or (2).
------------------------------------------------------------------------

0
13. Table 5 in subpart NNNNN is revised to read as follows:

    Table 5 to Subpart NNNNN of Part 63.--Continuous Compliance With
            Emission Limitations and Work Practice Standards
    [As stated in Sec.   63.9040, you must comply with the following
  requirements to demonstrate continuous compliance with the applicable
  emission limitations for each affected source and each work practice
                                standard]
------------------------------------------------------------------------
                                For the following
                                     emission
                                  limitation and    You must demonstrate
        For each . . .            work practice    continuous compliance
                                  standard . . .          by . . .

------------------------------------------------------------------------
1. Affected source using a      a. In Tables 1     i. Collecting the
 caustic scrubber or water       and 2 to this      scrubber inlet
 scrubber/adsorber.              subpart.           liquid or
                                                    recirculating liquid
                                                    flow rate, as
                                                    appropriate, and
                                                    effluent pH
                                                    monitoring data
                                                    according to Sec.
                                                    63.9025, consistent
                                                    with your monitoring
                                                    plan; and
                                                   ii. Reducing the data
                                                    to 1-hour and daily
                                                    block averages
                                                    according to the
                                                    requirements in Sec.
                                                      63.9025; and

                                                   iii. Maintaining the
                                                    daily average
                                                    scrubber inlet
                                                    liquid or
                                                    recirculating liquid
                                                    flow rate, as
                                                    appropriate, above
                                                    the operating limit;
                                                    and
                                                   iv. Maintaining the
                                                    daily average
                                                    scrubber effluent pH
                                                    within the operating
                                                    limits.
2. Affected source using any    a. In Tables 1     i. Conducting
 other control device.           and 2 to this      monitoring according
                                 subpart.           to your monitoring
                                                    plan established
                                                    under Sec.   63.8(f)
                                                    in accordance with
                                                    Sec.   63.9025(c);
                                                    and
                                                   ii. Collecting the
                                                    parameter data
                                                    according to your
                                                    monitoring plan
                                                    established under
                                                    Sec.   63.8(f); and
                                                   iii. Reducing the
                                                    data to 1-hour and
                                                    daily block averages
                                                    according to the
                                                    requirements in Sec.
                                                      63.9025; and
                                                   iv. Maintaining the
                                                    daily average
                                                    parameter values
                                                    within the operating
                                                    limits established
                                                    according to your
                                                    monitoring plan
                                                    established under
                                                    Sec.   63.8(f).
3. Affected source using no     a. In Tables 1     i. Verifying that you
 control device.                 and 2 to this      have not made any
                                 subpart..          process changes that
                                                    could reasonably be
                                                    expected to change
                                                    the outlet
                                                    concentration since
                                                    your most recent
                                                    performance test for
                                                    an emission point.
4. Leaking equipment affected   a. In Table 1 to   i. Verifying that you
 source.                         this subpart.      continue to use a
                                                    LDAR plan; and
                                                   ii. Reporting any
                                                    instances where you
                                                    deviated from the
                                                    plan and the
                                                    corrective actions
                                                    taken.
------------------------------------------------------------------------

0
14. Table 7 in subpart NNNNN is revised to read as follows:

           Table 7 to Subpart NNNNN of Part 63.--Applicability of General Provisions to Subpart NNNNN
 [As stated in Sec.   63.9065, you must comply with the applicable General Provisions requirements according to
                                                 the following]
----------------------------------------------------------------------------------------------------------------
                                                                Applies to subpart
            Citation                      Requirement                  NNNNN                  Explanation
----------------------------------------------------------------------------------------------------------------
Sec.   63.1.....................  Initial applicability       Yes.
                                   determination;
                                   applicability after
                                   standard established;
                                   permit requirements;
                                   extensions; notifications.
Sec.   63.2.....................  Definitions...............  Yes...................  Additional definitions are
                                                                                found in Sec.   63.9075.
Sec.   63.3.....................  Units and abbreviations...  Yes.
Sec.   63.4.....................  Prohibited activities;      Yes.
                                   compliance date;
                                   circumvention,
                                   severability.
Sec.   63.5.....................  Construction/               Yes.
                                   reconstruction
                                   applicability;
                                   applications; approvals.
Sec.   63.6(a)..................  Compliance with standards   Yes.
                                   and maintenance
                                   requirements-
                                   applicability.
Sec.   63.6(b)(1)-(4)...........  Compliance dates for new    Yes...................  Sec.   63.8995 specifies
                                   or reconstructed sources.                           compliance dates.
Sec.   63.6(b)(5)...............  Notification if commenced   Yes.
                                   construction or
                                   reconstruction after
                                   proposal.
Sec.   63.6(b)(6)...............  [Reserved]................  Yes.
Sec.   63.6(b)(7)...............  Compliance dates for new    Yes...................  Sec.   63.8995 specifies
                                   or reconstructed area                               compliance dates.
                                   sources that become major.
Sec.   63.6(c)(1)-(2)...........  Compliance dates for        Yes...................  Sec.   63.8995 specifies
                                   existing sources.                                   compliance dates.
Sec.   63.6(c)(3)-(4)...........  [Reserved]................  Yes.
Sec.   63.6(c)(5)...............  Compliance dates for        Yes...................  Sec.   63.8995 specifies
                                   existing area sources                               compliance dates.
                                   that become major.
Sec.   63.6(d)..................  [Reserved]................  Yes.
Sec.   63.6(e)(1)-(2)...........  Operation and maintenance   Yes.
                                   requirements.
Sec.   63.6(e)(3)...............  SSM plans.................  Yes.
Sec.   63.6(f)(1)...............  Compliance except during    Yes.
                                   SSM.
Sec.   63.6(f)(2)-(3)...........  Methods for determining     Yes.
                                   compliance.
Sec.   63.6(g)..................  Use of an alternative non-  Yes.
                                   opacity emission standard.
Sec.   63.6(h)..................  Compliance with opacity/    No....................  Subpart NNNNN does not
                                   visible emission                                    specify opacity or
                                   standards.                                          visible emission
                                                                                standards.

Sec.   63.6(i)..................  Extension of compliance     Yes.
                                   with emission standards.
Sec.   63.6(j)..................  Presidential compliance     Yes.
                                   exemption.
Sec.   63.7(a)(1)-(2)...........  Performance test dates....  Yes...................  Except for existing
                                                                                affected sources as
                                                                                specified in Sec.
                                                                                63.9010(b).
Sec.   63.7(a)(3)...............  Administrator's Clean Air   Yes.
                                   Act section 114 authority
                                   to require a performance
                                   test.
Sec.   63.7(b)..................  Notification of             Yes.
                                   performance test and
                                   rescheduling.
Sec.   63.7(c)..................  Quality assurance program   Yes.
                                   and site-specific test
                                   plans.
Sec.   63.7(d)..................  Performance testing         Yes.
                                   facilities.
Sec.   63.7(e)(1)...............  Conditions for conducting   Yes.
                                   performance tests.
Sec.   63.7(f)..................  Use of an alternative test  Yes.
                                   method.
Sec.   63.7(g)..................  Performance test data       Yes.
                                   analysis, recordkeeping,
                                   and reporting.
Sec.   63.7(h)..................  Waiver of performance       Yes.
                                   tests.
Sec.   63.8(a)(1)-(3)...........  Applicability of            Yes...................  Additional monitoring
                                   monitoring requirements.                            requirements are found in
                                                                                Sec.   63.9005(d) and
                                                                                63.9035.
63.8(a)(4)......................  Monitoring with flares....  No....................  Subpart NNNNN does not
                                                                                refer directly or
                                                                                indirectly to Sec.
                                                                                63.11.
Sec.   63.8(b)..................  Conduct of monitoring and   Yes.
                                   procedures when there are
                                   multiple effluents and
                                   multiple monitoring
                                   systems.
Sec.   63.8(c)(1)-(3)...........  Continuous monitoring       Yes...................  Applies as modified by
                                   system O&M.                                         Sec.   63.9005(d).
Sec.   63.8(c)(4)...............  Continuous monitoring       Yes...................  Applies as modified by
                                   system requirements                                 Sec.   63.9005(d).
                                   during breakdown, out-of-
                                   control, repair,
                                   maintenance, and high-
                                   level calibration drifts.
Sec.   63.8(c)(5)...............  Continuous opacity          No....................  Subpart NNNNN does not
                                   monitoring system (COMS)                            have opacity or visible
                                   minimum procedures.                                 emission standards.
Sec.   63.8(c)(6)...............  Zero and high level         Yes...................  Applies as modified by
                                   calibration checks.                                 Sec.   63.9005(d).
Sec.   63.8(c)(7)-(8)...........  Out-of-control periods,     Yes.
                                   including reporting.
Sec.   63.8(d)-(e)..............  Quality control program     No....................  Applies as modified by
                                   and CMS performance                                 Sec.   63.9005(d).
                                   evaluation.
Sec.   63.8(f)(1)-(5)...........  Use of an alternative       Yes.
                                   monitoring method.
Sec.   63.8(f)(6)...............  Alternative to relative     No....................  Only applies to sources
                                   accuracy test.                                      that use continuous
                                                                                emissions monitoring
                                                                                systems (CEMS).
Sec.   63.8(g)..................  Data reduction............  Yes...................  Applies as modified by
                                                                                Sec.   63.9005(d).
Sec.   63.9(a)..................  Notification requirements-- Yes.
                                   applicability.
Sec.   63.9(b)..................  Initial notifications.....  Yes...................  Except Sec.   63.9045(c)
                                                                                requires new or
                                                                                reconstructed affected
                                                                                sources to submit the
                                                                                application for
                                                                                construction or
                                                                                reconstruction required
                                                                                by Sec.   63.9(b)(1)(iii)
                                                                                in lieu of the initial
                                                                                notification.
Sec.   63.9(c)..................  Request for compliance      Yes.
                                   extension.
Sec.   63.9(d)..................  Notification that a new     Yes.
                                   source is subject to
                                   special compliance
                                   requirements.
Sec.   63.9(e)..................  Notification of             Yes.
                                   performance test.
Sec.   63.9(f)..................  Notification of visible     No....................  Subpart NNNNN does not
                                   emissions/opacity test.                             have opacity or visible
                                                                                emission standards.
Sec.   63.9(g)(1)...............  Additional CMS              Yes.
                                   notifications--date of
                                   CMS performance
                                   evaluation.
Sec.   63.9(g)(2)...............  Use of COMS data..........  No....................  Subpart NNNNN does not
                                                                                require the use of COMS.
Sec.   63.9(g)(3)...............  Alternative to relative     No....................  Applies only to sources
                                   accuracy testing.                                   with CEMS.
Sec.   63.9(h)..................  Notification of compliance  Yes...................  Except the submission date
                                   status.                                             specified in Sec.
                                                                                63.9(h)(2)(ii) is
                                                                                superseded by the date
                                                                                specified in Sec.
                                                                                63.9045(f).
Sec.   63.9(i)..................  Adjustment of submittal     Yes.                    ..........................
                                   deadlines.
Sec.   63.9(j)..................  Change in previous          Yes.                    ..........................
                                   information.
Sec.   63.10(a).................  Recordkeeping/reporting     Yes.                    ..........................
                                   applicability.
Sec.   63.10(b)(1)..............  General recordkeeping       Yes...................  Sec.  Sec.   63.9055 and
                                   requirements.                                       63.9060 specify
                                                                                additional recordkeeping
                                                                                requirements.
Sec.   63.10(b)(2)(i)-(xi)......  Records related to SSM      Yes.                    ..........................
                                   periods and CMS.
Sec.   63.10(b)(2)(xii).........  Records when under waiver.  Yes.                    ..........................
Sec.   63.10(b)(2)(xiii)........  Records when using          No....................  Applies only to sources
                                   alternative to relative                             with CEMS.
                                   accuracy test.
Sec.   63.10(b)(2)(xiv).........  All documentation           Yes.                    ..........................
                                   supporting initial
                                   notification and
                                   notification of
                                   compliance status.
Sec.   63.10(b)(3)..............  Recordkeeping requirements  Yes.                    ..........................
                                   for applicability
                                   determinations.

Sec.   63.10(c).................  Additional recordkeeping    Yes...................  Applies as modified by
                                   requirements for sources                            Sec.   63.9005 (d).
                                   with CMS.
Sec.   63.10(d)(1)..............  General reporting           Yes...................  Sec.   63.9050 specifies
                                   requirements.                                       additional reporting
                                                                                requirements.
Sec.   63.10(d)(2)..............  Performance test results..  Yes...................  Sec.   63.9045(f)
                                                                                specifies submission
                                                                                date.
Sec.   63.10(d)(3)..............  Opacity or visible          No....................  Subpart NNNNN does not
                                   emissions observations.                             specify opacity or
                                                                                visible emission
                                                                                standards.
Sec.   63.10(d)(4)..............  Progress reports for        Yes.                    ..........................
                                   sources with compliance
                                   extensions.
Sec.   63.10(d)(5)..............  SSM reports...............  Yes.                    ..........................
Sec.   63.10(e)(1)..............  Additional CMS reports--    Yes...................  Applies as modified by
                                   general.                                            Sec.   63.9005(d).
Sec.   63.10(e)(2)(i)...........  Results of CMS performance  Yes...................  Applies as modified by
                                   evaluations.                                        Sec.   63.9005(d).
Sec.   63.10(e)(2)..............  Results of COMS             No....................  Subpart NNNNN does not
                                   performance evaluations.                            require the use of COMS.
Sec.   63.10(e)(3)..............  Excess emissions/CMS        Yes.                    ..........................
                                   performance reports.
Sec.   63.10(e)(4)..............  Continuous opacity          No....................  Subpart NNNNN does not
                                   monitoring system data                              require the use of COMS.
                                   reports.
Sec.   63.10(f).................  Recordkeeping/reporting     Yes.                    ..........................
                                   waiver.
Sec.   63.11....................  Control device              No....................  Facilities subject to
                                   requirements--applicabili                           subpart NNNNN do not use
                                   ty.                                                 flares as control
                                                                                devices.
Sec.   63.12....................  State authority and         Yes...................  Sec.   63.9070 lists those
                                   delegations.                                        sections of subparts
                                                                                NNNNN and A that are not
                                                                                delegated.
Sec.   63.13....................  Addresses.................  Yes.                    ..........................
Sec.   63.14....................  Incorporation by reference  Yes...................  Subpart NNNNN does not
                                                                                incorporate any material
                                                                                by reference.
Sec.   63.15....................  Availability of             Yes.                    ..........................
                                   information/
                                   confidentiality.
----------------------------------------------------------------------------------------------------------------

[FR Doc. 06-3309 Filed 4-6-06; 8:45 am]

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