Approval and Promulgation of Implementation Plans; New Source Review;
State of Nevada, Clark County Department of Air Quality Management
[Federal Register: June 2, 2004 (Volume 69, Number 106)]
[Proposed Rules]
[Page 31056-31068]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr02jn04-25]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 52
[NV052-0079; FRL-7669-3]
Approval and Promulgation of Implementation Plans; New Source Review;
State of Nevada, Clark County Department of Air Quality Management
AGENCY: Environmental Protection Agency (EPA).
ACTION: Proposed rule.
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SUMMARY: This action is a proposed partial approval and partial
disapproval of several rules that were submitted as a revision of the
Clark County portion of the Nevada State Implementation Plan (SIP). We
had approved a similar version of these rules into the Nevada SIP in
1999. See 64 FR 25210 (May 11, 1999). Our approval was appealed to the
U.S. Court of Appeals for the Ninth Circuit, which vacated the 1999
approval and remanded our approval of the rules for further
consideration. See Hall v. EPA, 273 F.3d 1146 (9th Cir. 2001). This
proposed partial approval and partial disapproval of the rules for the
reasons discussed more fully below responds to the issues raised in the
court's remand.
The rules at issue in this proposed action were adopted by the
Clark County Department of Air Quality Management for issuing permits
for new or modified stationary sources in Clark County to comply with
the applicable permitting requirements under parts C and D of title I
of the Clean Air Act as amended in 1990 to prevent significant
deterioration in attainment areas and to attain the National Ambient
Air Quality Standards in nonattainment areas. EPA is also proposing to
approve as a revision to the Nevada SIP a State regulation prohibiting
the construction of major new or modified sources under exclusive State
jurisdiction in the nonattainment areas within Clark County. The
intended effect of this proposed action is to ensure that the Clark
County Department of Air Quality Management's permitting rules are
consistent with Ninth Circuit's ruling in Hall v. EPA and with the
requirements of the Clean Air Act, as amended in 1990. EPA is also
proposing to amend the appropriate section of the Code of Federal
Regulations to reflect the successful court challenge to an EPA
approval of previous versions of these local rules. Lastly, under
section 110(k)(6) of the Act, EPA is proposing to correct or clarify
certain previous final rulemaking actions taken by EPA on revisions to
the Clark County portion of the Nevada SIP. EPA is taking comments on
this proposal and plans to follow with a final action.
DATES: Comments on this proposed rule must be received in writing by
July 2, 2004.
ADDRESSES: Written comments on this action should be addressed to
Gerardo Rios, Chief, Permits Office, Air Division (AIR-3), EPA Region
IX, 75 Hawthorne Street, San Francisco, California, 94105.
You can inspect copies of the State's submittals, EPA's technical
support documents (TSDs), and other supporting documentation relevant
to this action, during normal business hours at Air Division, EPA
Region IX, 75 Hawthorne Street, San Francisco, California 94105.
You may also see copies of the State's two submittals at the Nevada
Division of Environmental Protection, 333 W. Nye Lane, Room 138, Carson
City, Nevada 89706. The State's submittal of DAQM's amended rules is
available at the Clark County Department of Air Quality Management, 500
S. Grand Central Parkway, Las Vegas, Nevada 89155.
FOR FURTHER INFORMATION CONTACT: Roger Kohn, EPA Region IX, Air
Division, Permits Office (AIR-3), at (415) 972-3973 or
kohn.roger@epa.gov.
SUPPLEMENTARY INFORMATION: Throughout this document, ``we,'' ``us'' and
``our'' refer to EPA.
Table of Contents
I. Evaluation of Clark County New Source Review Rules
A. The State's Submittal
B. EPA's Evaluation and Action
II. Corrections to, or Clarification of, the Clark County Portion of
Nevada State Implementation Plan
III. Proposed Action and Public Comment
IV. Statutory and Executive Order Reviews
I. Evaluation of Clark County New Source Review Rules
A. The State's Submittal
Table 1 lists the rules addressed by this proposal with the dates
that they were adopted by the local air agency, the Clark County
Department of Air Quality Management (DAQM), or were adopted by the
State Environmental
[[Page 31057]]
Commission (SEC), and submitted by the State air agency, the Nevada
Division of Environmental Protection (NDEP), to EPA as revisions to the
Nevada State Implementation Plan (SIP).
Table 1.--Submitted Rules
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Agency Rule # Rule title Adopted Submitted
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DAQM... 0.............. Definitions............ 10/07/03 10/23/03
DAQM... 11............. Ambient Air Quality 10/07/03 10/23/03
Standards.
DAQM... 12............. Preconstruction Review 10/07/03 10/23/03
for New or Modified
Stationary Sources.
DAQM... 52.8........... Gasoline Dispensing 10/07/03 10/23/03
Facilities--Section 52
Offset Program.
DAQM... 58............. Emission Reduction 10/07/03 10/23/03
Credits.
DAQM... 59............. Emission Offsets...... 10/07/03 10/23/03
SEC.... NAC 445B. 22083 Construction, major 03/29/94 11/20/03
modification or
relocation of plants to
generate electricity
using steam produced by
burning of fossil fuels.
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On November 18, 2003, the submittal containing DAQM's rules was
found to meet the completeness criteria in 40 CFR part 51, appendix V,
which must be met before formal EPA review.
DAQM's predecessor agency (the Clark County Health District)
adopted earlier versions of the Clark County New Source Review (NSR)
rules, then numbered section 1 (Definitions), section 11 (Ambient Air
Quality Standards), and section 15 (Source Registration), at various
times from 1979 through 1981, which we approved into the Clark County
portion of the Nevada SIP at various times in 1981 and 1982.
Specifically, we approved different defined terms of section 1
(Definitions) into the applicable SIP on three occasions in 1981 and
1982. See 46 FR 21758 (April 14, 1981), 46 FR 43141 (August 27, 1981),
and 47 FR 26620 (June 21, 1982). We approved section 11 (Ambient Air
Quality Standards) into the applicable SIP on August 27, 1981 (46 FR
43141). We approved different subsections of section 15 (Source
Registration) into the applicable SIP on two occasions in 1981 and
1982. See 46 FR 21758 (April 14, 1981) and 47 FR 26620 (June 21, 1982).
Pursuant to the Clean Air Act Amendments of 1990 (CAA or Act),
Clark County revised their NSR rules, then contained in local sections
0, 12, and 58, and in 1995, EPA proposed to approve with a contingency,
and disapprove in the alternative, these revised rules into the SIP.
See 60 FR 38777 (July 28, 1995). Following our 1995 proposed action,
Clark County revised their NSR rules (sections 0, 12, and 58) to
address the contingency identified by EPA and re-submitted them via
NDEP to EPA. In 1999, we found the contingency to have been satisfied
and approved the revised NSR rules into the SIP. See 64 FR 25210 (May
11, 1999). Our 1999 final action was challenged, and in 2001, the U.S.
Court of Appeals for the Ninth Circuit vacated our approval of Clark
County's NSR rules (specifically, sections 0, 12, and 58, as submitted
and acted on in 1999). See Hall v. EPA, 273 F.3d 1146 (9th Cir. 2001).
The court vacated our approval on the grounds that EPA did not have
an adequate basis under section 110(l) of the Act to conclude that
substitution (i.e., replacement or supercession) of the pre-existing
NSR SIP rules (sections 1, 11, and 15) with the new NSR rules (sections
0, 12, and 58) would not interfere with attainment of the NAAQS for
carbon monoxide (CO) and particulate matter with an aerodynamic
diameter less than or equal to a nominal 10 micrometers (PM-10) (i.e.,
the two pollutants for which a sub-region of Clark County, Las Vegas
Valley, is designated nonattainment) by the applicable attainment
deadlines. In recognition of this ruling, we are proposing to delete
and reserve the paragraphs in section 1470 (``Identification of plan'')
of 40 CFR part 52, subpart DD (Nevada) that codified our 1999 approval
(i.e., 40 CFR 52.1470(c)(37) and (38)) to clarify that, until the
effective date of EPA's final approval of the submitted NSR rules into
the SIP, sections 1, 11, and 15 (as approved by EPA in 1981 and 1982)
represent the applicable SIP NSR rules in Clark County.
Subsequently, Clark County adopted revised NSR rules (then
contained in local sections 0, 11, 12, 58, and 59) on December 4, 2001.
This version of the Clark County NSR rules, excluding section 11, was
submitted to EPA by NDEP by letter dated February 25, 2003. We did not
take action on that submittal, which has been superceded by DAQM's
adoption of additional revisions to the Clark County NSR rules (now
expanded to include section 52, subsection 52.8, as well as sections 0,
11, 12, 58 and 59) on October 7, 2003 and NDEP's re-submittal to EPA
dated October 23, 2003. In this notice, we refer to this latest
submittal of the DAQM NSR rules (sections 0, 11, 12, 52.8, 58, and 59)
as the ``DAQM NSR submittal.'' While we can act on only the most
recently submitted version, we have reviewed materials provided with
previous submittals. The TSD provides additional background information
on the various NSR SIP submittals for Clark County.
EPA revised its federal regulations implementing Parts C and D of
the CAA on December 31, 2002, and those revisions became effective on
March 3, 2003. Because Clark County had submitted a version of its
revised NSR rules to us specifically in response to the court's 2001
ruling in Hall v. EPA, EPA is now evaluating DAQM's NSR submittal based
on the federal NSR regulations that were in effect at the time of the
ruling in Hall v. EPA (prior to December 31, 2002). This proposed
rulemaking, therefore, does not establish any precedent for evaluating
whether a proposed NSR SIP fulfills the requirements of the revised NSR
regulations that were published December 31, 2002. The evaluation in
this proposed rulemaking of DAQM's NSR submittal is limited to whether
the submittal meets the requirements of the federal NSR regulations as
they existed at the time of the ruling in Hall v. EPA, prior to
revision on December 31, 2002.
There is no previous version of Nevada Administrative Code (NAC)
445B.22083 (Construction, major modification or relocation of plants to
generate electricity using steam produced by burning of fossil fuels)
approved, or submitted for approval, into the Nevada SIP.
Submitted DAQM sections 0, 11, 12, 52.8, 58, and 59 represent a
comprehensive revision to Clark County's NSR program and are intended
to satisfy the requirements under both part C (prevention of
significant deterioration)(PSD) and part D (nonattainment new source
review) of
[[Page 31058]]
title I of the Act as those parts relate to permitting of major new
sources or major modifications as well as provide for a minor source
permitting program as required under section 110(a)(2)(C) of the Act.
Submitted DAQM section 0 (Definitions) consists of definitions of all
terms relating to new sources and modifications to existing sources of
air pollution. As is the case for existing SIP section 1 (Definitions),
DAQM section 0 also contains numerous definitions of terms used in
prohibitory rules not related to NSR. Some of these prohibitory rules
are already approved into the SIP (e.g., SIP section 53 (Oxygenated
Gasoline Program)) while others are expected to be approved into the
SIP in the near future (e.g., DAQM section 54 (Cleaner Burning
Gasoline) and DAQM sections 90 through 94 (related to various fugitive
dust sources)). Therefore, with respect to submitted DAQM section 0, we
are proposing to approve the entire rule, not just those definitions
related to NSR, however, as explained later in this notice, we are
proposing to retain in the SIP certain definitions from existing SIP
section 1 because they are needed for various existing SIP rules
unaffected by this action.
DAQM section 11 sets forth the current national ambient air quality
standards (NAAQS). DAQM section 12 sets forth the source permitting
requirements, including those related to applicability, control
technology (i.e., Lowest Achievable Emission Rate (LAER) or Best
Available Control Technology (BACT)), offsets, and public notice. DAQM
subsection 52.8 contains offset requirements for new or modified
gasoline dispensing facilities whose annual through-put is more than
3.6 million gallons of gasoline per year. DAQM section 58 establishes
procedures for the creation, banking, and use of emission reduction
credits, and DAQM section 59 establishes offset requirements for new or
modified sources. NAC 445B.22083 is a State regulation prohibiting the
construction of major new or modified sources under exclusive State
jurisdiction in the nonattainment areas within Clark County. The TSD
has more information about these rules.
B. EPA's Evaluation and Action
SIP Revision Procedural Requirements
The Act requires States to observe certain procedural requirements
in developing implementation plans and plan revisions for submission to
EPA. Sections 110(a)(2) and 110(l) of the Act provide that each
implementation plan or revision submitted by a State must be adopted
after reasonable notice and public hearing. Section 172(c)(7) of the
Act provides that plan provisions for nonattainment areas shall meet
the applicable provisions of section 110(a)(2).
DAQM held a public hearing on October 7, 2003 to entertain public
comment on revisions to the following local air pollution regulations:
sections 0, 11, 12, 52.8, 58 and 59. Notice for that hearing was
provided by advertisement in a newspaper of general circulation in the
applicable area on three separate days in September 2003. On October 7,
2003, the amended rules were adopted by DAQM and submitted to the
State. On October 23, NDEP submitted the amended rules to EPA for
approval as a revision to the Nevada SIP. We find that this process
satisfies the procedural requirements under sections 110(a)(2), 110(l)
and 172(c)(7) of the Act.
With respect to NAC 445B.22083, the Nevada SEC held a public
hearing on March 3, 1994 to entertain public comment on the submitted
rule. Notice for that hearing was provided by advertisement in a
newspaper of general circulation in the applicable area on three
separate days in February 1994. On March 3, 1994, the Nevada SEC
adopted the submitted rule, which was subsequently renumbered in 2002
to its current codification as NAC 445B.22083. On November 20, 2003,
NDEP submitted NAC 445B.22083 to EPA for approval as a revision to the
Nevada SIP. We find that this process satisfies the procedural
requirements under sections 110(a)(2), 110(l), and 172(c)(7) of the Act.
General Nonattainment and PSD Requirements
We have evaluated DAQM's NSR SIP submittal described above against
the applicable requirements of section 110 and parts C and D of (title
I) of the Act and the implementing regulations at 40 CFR 51.160 through
51.166 (July 1, 2002). We also relied upon the following materials in
the review of this submittal: General Preamble for the Implementation
of Title I of the Clean Air Act Amendments of 1990 (see 57 FR 13498,
April 16, 1992), EPA's Emission Offset Interpretive Ruling (40 CFR part
51, appendix S), and EPA's policy document entitled, ``Improving Air
Quality with Economic Incentive Programs,'' that was published in
January 2001.
We note that, on December 31, 2002, EPA published a final notice
revising regulations governing NSR programs (``Federal NSR
regulations'') mandated by parts C and D of title I of the Act. See 67
FR 80186. These revisions include changes in the NSR applicability
requirements for modifications to allow sources more flexibility to
respond to rapidly changing markets and to plan for future investments
in pollution control and prevention technologies. We selected March 3,
2003 as the effective date for our revision to the Federal NSR
regulations. Normally, we would be evaluating the Clark County NSR SIP
submittal on the basis of the current Federal NSR regulations, which
would include these most recent revisions, but in light of the unusual
circumstances surrounding EPA's review process for the Clark County NSR
rules, i.e., court vacature of a fully-approved set of NSR rules, we
have not evaluated the submitted NSR rules for consistency with the
revised Federal NSR regulations but have evaluated them instead against
the Federal NSR regulations that were in effect when the rules were
being revised to address issues raised by EPA in the wake of the Hall
decision. Like other State and local agencies, Clark County must adopt
and submit revisions to its SIP-approved NSR rules implementing the
minimum program requirements set forth in the revised Federal NSR
regulations no later than January 2, 2006. See 67 FR 80186, at 80240
(December 31, 2002). Given this approach to our evaluation of the DAQM
NSR submittal, the reader should refer to the 2002 version of 40 CFR
parts 51 and 52 (revised as of July 1, 2002) where citations are made
herein to the those parts of the CFR.
Nonattainment NSR Requirements
The Act requires all States with nonattainment areas to submit, by
November 15, 1992, nonattainment NSR provisions that comply with part D
(of title I) of the Act and the related implementing regulations. The
Las Vegas Valley (hydrographic area #212), a sub-region within
Clark County, was designated as a nonattainment area for both the
carbon monoxide (CO) and particulate matter (PM-10) NAAQS under the
Clean Air Act Amendments of 1990, and thus, the nonattainment NSR
requirements apply to that area. Las Vegas Valley is currently
classified as a ``serious'' nonattainment area for both the CO and PM-
10 NAAQS. See 40 CFR 81.329.
First, it should be noted that, pursuant to State law, the State of
Nevada, not a local air or health district, has jurisdiction over
plants which generate electricity by using steam produced by the
burning of fossil fuel within the State of Nevada. The applicable State
law, now codified in Nevada Revised Statutes (NRS)
[[Page 31059]]
445B.500, was approved by EPA as a SIP revision in 1980 as NRS
445.546(4). See 45 FR 46384 (July 10, 1980). Thus, within Clark County,
the State, not DAQM, has jurisdiction over such plants that are
located, or that will be constructed, in that county (including the
nonattainment area). This exclusion is reflected in submitted DAQM
section 12, subsection 12.1.3.2.
The Nevada State Environmental Commission (SEC), the administrative
body responsible for the air quality regulations implemented by NDEP,
has not adopted a preconstruction permit program that complies with
part D of the Act (i.e., Nonattainment NSR) for the nonattainment area
within Clark County. Normally, because NDEP has jurisdiction over a
particular category of stationary sources in a nonattainment area
(i.e., Las Vegas Valley), the State would be required to adopt and
submit a Nonattainment NSR program for new major sources or major
modifications within the applicable source category in the
nonattainment area. However, EPA is not requiring the State to submit
Nonattainment NSR rules for Las Vegas Valley because the Nevada SEC
adopted a regulation (NAC 445B.22083) that prohibits new power plants
or major modifications to existing power plants under State
jurisdiction within the Las Vegas Valley nonattainment area, and NDEP
has submitted that regulation to EPA as a revision to the SIP. We
propose to approve this regulation into the Nevada SIP to resolve the
regulatory gap that would otherwise exist in connection with NSR for
sources under NDEP jurisdiction within the nonattainment area of Clark
County.
With respect to the DAQM NSR submittal, we have concluded that it
meets the applicable Nonattainment NSR requirements on the basis of the
following findings:
1. The DAQM NSR submittal provides for calculation of emissions
offsets based on the same emissions baseline used in the demonstration
of reasonable further progress as required by section 173(a)(1)(A) of
the Act (see DAQM section 0, ``emission reduction credit'' and
``baseline emissions''), provides for emissions offsets to be obtained
when the construction permit for a new or modified source is issued and
to be in effect by the time the new or modified source commences
operation as required by section 173(c)(1) of the Act (see DAQM section
59, subsection 59.4.2.6), provides for emissions increases from new
major sources or major modifications to be offset by real reductions in
actual emissions as required by section 173(c)(1) of the Act (see DAQM
section 0, ``emission reduction credit (ERC),'' and specifically
paragraph (b) of that definition: ``Section 58 emission reduction
credit'', and DAQM section 59, subsection 59.1.5), prohibits emissions
reductions otherwise required by the Act from being used for NSR offset
purposes as required by section 173(c)(2) of the Act (see DAQM section
0, ``surplus,'' and DAQM section 59, subsection 59.4.2.1), and provides
for appropriate limitations on ``prior shutdown'' emission reduction
credits as required in 40 CFR 51.165(a)(3)(ii)(C) (see DAQM section 58,
subsection 58.3.2.5.3).
2. The DAQM NSR submittal provides for an analysis of alternative
sites, sizes, production processes, and environmental control
techniques as a prerequisite to issuing construction permits to new
major sources or major modifications of nonattainment pollutants as
required by section 173(a)(5) of the Act (see DAQM section 12,
subsection 12.1.4.1(k)), provides for a definition of ``stationary
source'' that includes certain internal combustion engines as required
by section 302(z) of the Act (see DAQM section 0, ``stationary
source''), and provides for a demonstration that all other major
stationary sources under the same ownership as the proposed source are
in compliance with the Act as required by section 173(a)(3) of the Act
(see DAQM section 12, subsection 12.8.2(b)).
3. The DAQM NSR submittal provides for opportunities for, and due
consideration of, public comment as required by 40 CFR 51.161 and
provides for substantive requirements for new or modified minor sources
as required in 40 CFR 51.160 through 51.164 (see the pollutant-specific
requirements in DAQM section 12, subsection 12.2 and the notice and
public hearing requirements in DAQM section 12, subsections 12.3.2,
12.3.3, and 12.3.4).
4. The DAQM NSR submittal provides for appropriate stack height
limitations as required in 40 CFR 51.118(a) (see DAQM section 12,
subsection 12.5.4), provides for appropriate review of a source or
modification which becomes major due to a relaxation in a federally-
enforceable limit as required in 40 CFR 51.165(a)(5)(ii) (see DAQM
section 0, ``major modification'' and ``stationary source''), provides
for additional requirements for any new major source or major
modification that may have an impact on visibility in any mandatory
Class I Federal Area as required in 40 CFR 51.307(b)(2) (see DAQM
section 12, subsection 12.12), provides for appropriate consideration
of fugitive emissions as required in 40 CFR 51.165(a)(1)(iv)(C) (see
DAQM section 0, paragraph (b)(1) under ``stationary source''), and
provides for application of the Lowest Achievable Emission Rate (LAER)
on all new major sources and major modifications of nonattainment
pollutants as required in section 173(a)(2) of the Act (see DAQM
section 12, subsections 12.2.2.2, 12.2.4.2, and 12.2.23.2 for PM-10,
and subsections 12.2.7.3 and 12.2.9.3 for CO).
5. The DAQM NSR submittal provides for, as required under subpart 3
of part D of title I of the Act, appropriate thresholds for major
sources and major modifications in ``serious'' CO nonattainment areas
(see DAQM section 0, ``stationary source'' and ``major modification'')
in which stationary sources are not significant contributors to ambient
CO levels (see EPA's proposed finding related to the impact of
stationary sources on ambient CO levels in Las Vegas Valley in 68 FR
4141, at 4154 (January 28, 2003)), and provides for an appropriate
offset ratio (see DAQM section 59, subsection 59.1.4, table 59.1.2).
6. The DAQM NSR submittal provides for, as required under subpart 4
of part D of title I of the Act, appropriate thresholds for major
sources and major modifications in ``serious'' PM-10 nonattainment
areas (see DAQM section 0, ``stationary source'' and ``major
modification'') in which PM-10 precursors (e.g., oxides of nitrogen,
sulfur dioxide, and volatile organic compounds) do not contribute
significantly to PM-10 levels which exceed the standards in the area
(see EPA's proposed finding related to the impact of PM-10 precursors
in Las Vegas Valley in 68 FR 2954, at 2958 (January 22, 2003)), and
provides for an appropriate offset ratio (see DAQM section 59,
subsection 59.1.4, table 59.1.2).
The TSD provides additional information on our evaluation of the
DAQM NSR submittal relative to Nonattainment NSR requirements.
PSD NSR Requirements
Part C of title I of the Act contains the provisions, including
preconstruction permit requirements for new major sources or major
modifications, for the prevention of significant deterioration (PSD) of
air quality in areas designated as ``attainment'' or ``unclassifiable''
for the NAAQS. EPA's regulations for PSD permit programs are found in
40 CFR 51.166 and 40 CFR 52.21. Except for CO and PM-10 in Las Vegas
Valley (hydrographic area #212), Clark County is designated as
``attainment'' or ``unclassifiable'' for the NAAQS. See 40 CFR 81.329.
EPA offers States (and local air districts) two mechanisms by which
to
[[Page 31060]]
administer PSD permitting programs. First of all, EPA may delegate the
PSD permitting authority of 40 CFR 52.21 to a State or air district.
For instance, EPA has provided a partial delegation of authority to
NDEP to administer the Federal PSD program (set forth in 40 CFR 52.21).
See 68 FR 52837 (September 8, 2003). Thus, NDEP and EPA now share
responsibility for administering the PSD program as it relates to major
new, or major modifications at, plants which generate electricity by
using steam produced by the burning of fossil fuel in Clark County
(note that, in the nonattainment portion of Clark County (Las Vegas
Valley), such new or modified plants are prohibited under NAC 445B.22083).
Alternatively, a State or air district may develop its own PSD
program meeting the requirements of 40 CFR 51.166, and submit these
rules for inclusion in the applicable SIP. The DAQM NSR submittal has
been submitted for EPA approval under 40 CFR 51.166 as well as the
nonattainment NSR provisions discussed in the previous subsection of
this notice. With respect to the DAQM NSR submittal, we have concluded
that it meets the applicable PSD NSR requirements on the basis of the
following findings:
1. The DAQM NSR submittal provides for implementation of best
available control technology (BACT) for new major sources or major
modifications as required in section 40 CFR 51.166(j) (see DAQM section
12, subsections 12.2.3.2, 12.2.4.2, and 12.2.5.2 (PM-10); subsections
12.2.8.2, 12.2.9.3, and 12.2.10.2 (CO); subsections 12.2.11.2,
12.2.12.3, and 12.2.13.2 (volatile organic compounds (VOC));
subsections 12.2.14.4 and 12.2.15.2 (oxides of nitrogen
(NOX)); and subsections 12.2.16.2 (sulfur dioxide
(SO2)), 12.2.17.2 (lead (Pb)), and 12.2.19.7 (non-criteria
pollutants subject to PSD)).
2. The DAQM NSR submittal provides for an appropriate air quality
analysis, including pre-application air monitoring and post-
construction monitoring, as required in 40 CFR 51.166(m) (see DAQM
section 12, subsections 12.2.4.4, 12.2.4.5, 12.2.5.4, and 12.2.5.5 (PM-
10); subsections 12.2.9.2, 12.2.10.4, and 12.2.10.5 (CO); subsections
12.2.12.2, 12.2.13.4, and 12.2.13.5 (VOC); subsections 12.2.14.3,
12.2.15.4 and 12.2.15.5 (NOX); subsections 12.2.16.4 and
12.2.16.5 (SO2); subsections 12.2.17.4 and 12.2.17.5 (Lead);
subsections 12.2.19.1 and 12.1.19.2 (non-criteria PSD pollutants;
subsections 12.5.5 (PSD monitoring significance levels), 12.6.1 (pre-
construction ambient air monitoring requirements), and 12.6.2 (post-
construction ambient air monitoring requirements)).
3. The DAQM NSR submittal establishes the appropriate maximum
allowable ambient air increments (see DAQM section 12, subsections
12.2.3.5, 12.2.4.6, and 12.2.5.6 (PM-10); subsections 12.2.14.3 and
12.2.15.6 (NOX); subsection 12.2.16.6 (SO2)) and
ambient air ceilings (see DAQM section 12, subsections 12.2.3.5(b),
12.2.4.6(c), and 12.2.5.6(c) (PM-10); subsections 12.2.9.2 and
12.2.10.4(c) (CO); subsections 12.2.12.2 and 12.2.13.4(b) (VOC);
subsections 12.2.14.3 and 12.2.15.6(c) (NOX); subsections
12.2.16.6(c) (SO2) and 12.2.17.4 (Lead)) as required in 40
CFR 51.166(c) and (d). DAQM implements the ambient air ceilings by
reference to submitted DAQM section 11, which contains the current NAAQS.
4. The DAQM NSR submittal provides for completion of appropriate
additional impact analyses related to visibility, soils, and vegetation
and appropriate additional air quality impact analysis related to
general land use development as required in 40 CFR 51.166(o) (see DAQM
section 12, subsections 12.2.4.7 and 12.2.5.7 (PM-10); subsections
12.2.9.2 and 12.2.10.6 (CO); subsections 12.2.12.2 and 12.2.13.6 (VOC);
subsections 12.2.14.3 and 12.2.15.7 (NOX); and subsections
12.2.16.7 (SO2), 12.2.17.6 (Lead), and 12.2.19.3 (non-
criteria PSD pollutants)).
5. The DAQM NSR submittal provides for the appropriate Class II PSD
classification for all areas in Clark County based on their adopted
maximum allowable ambient air increments discussed above.
6. The DAQM NSR submittal provides for protection of air quality
related values (including visibility) in Class I areas as required in
40 CFR 51.166(p) (see DAQM section 12, subsections 12.2.4.6(b),
12.2.4.8, 12.2.5.6(b), and 12.2.5.8 (PM-10); subsections 12.2.9.2 and
12.2.10.7 (CO); subsections 12.2.12.2 and 12.2.13.7 (VOC); subsections
12.2.14.3, 12.2.15.6(b), and 12.2.15.8 (NOX); subsections
12.2.16.6(b) and 12.2.16.8 (SO2); subsection 12.2.17.7
(Lead); subsection 12.3.1.2(b) (notification of the Federal Land
Manager (FLM) or other appropriate Federal official); subsection
12.3.4.4 (framework for coordination between DAQM and the FLM or other
appropriate Federal official concerning potential impacts to Class I
areas)).
7. The DAQM NSR submittal provides for agency and public
participation as required in 40 CFR 51.166(p)(1) and 51.166(q) (see
DAQM section 12, subsections 12.3.1.2(b), 12.3.2, and 12.4.4)).
The TSD provides additional information on our evaluation of the
DAQM NSR submittal relative to PSD NSR requirements.
Section 110(l) of the Act
Section 110(l) of the Act prohibits EPA from approving any revision
of a SIP if the revision would interfere with any applicable
requirement concerning attainment and reasonable further progress, or
any other applicable requirement of the Act. For attainment pollutants
in attainment areas, our evaluation considers first whether a submitted
SIP revision would be as stringent as the provision in the existing
applicable implementation plan that it would supercede. If so, then no
further analysis is generally required. But, even if we cannot conclude
that a SIP revision is as stringent as the corresponding provision in
the applicable implementation plan, we may still approve the revision
so long as it can be shown that the revision would not interfere with
any applicable requirement concerning attainment and reasonable further
progress, or any other applicable requirement of the Act.
For nonattainment pollutants in nonattainment areas, one court has
ruled that our evaluation must extend beyond the issue of whether the
submitted SIP revision is as stringent as the existing SIP provision
that it would supercede and consider the submitted SIP revision in
light of current ambient air quality and nonattainment planning
requirements within the applicable nonattainment area. See Hall v. EPA,
273 F.3d 1146 (9th Cir. 2001). No other court has yet decided this
issue. In nonattainment areas too, we may approve SIP relaxations under
section 110(l) so long as they would not interfere with any applicable
requirement concerning attainment and reasonable further progress, or
any other applicable requirement of the Act (such as section 193 of the
Act, discussed in the next section of this TSD).
Based on the detailed pollutant-by-pollutant evaluation we provide
in the TSD (and summarize herein), which includes an evaluation of the
incremental SIP strengthenings and relaxations in the context of
pollutant emission sources, trends, air quality conditions, and
planning requirements, we conclude that approval of the DAQM NSR
submittal (and thereby replacement or supercession of the existing SIP
NSR rules) would not interfere with any applicable requirement
concerning attainment and reasonable further
[[Page 31061]]
progress, or an other applicable requirement of the Act.
Most of the significant differences between the two NSR programs
(SIP-approved versus the DAQM NSR submittal) are pollutant-specific
rather than of general applicability. There are, however, two
differences of general applicability that warrant discussion here: the
emissions test used to define a stationary source modification and the
basis for the minor (referred to as ``non-major'' under the submitted
DAQM NSR program) source baseline date.
First, the DAQM NSR submittal would replace a ``potential-to-
potential'' test with an ``actual-to-potential'' test for evaluating
proposed stationary source modifications (see existing SIP section 1,
``modification'' (1.52)). As a result, the existing SIP rule fails to
require NSR review for modifications at major sources, which involve a
significant net emissions increase in actual emissions, but no increase
in the potential to emit. In contrast, the DAQM NSR submittal provides
for the more protective ``actual-to-potential'' test for evaluating
proposed modifications at major sources. This would represent a general
strengthening of the NSR program compared to the existing SIP NSR
program. For additional Agency discussion on the relative stringency of
these two different tests for determining applicability of requirements
for modifications, see our final rule on recent NSR revisions at 67 FR
80186 at 80204-80206 (December 31, 2002).
Second, through the definition of ``baseline concentration'' in SIP
section 1, the existing SIP established a uniform minor source baseline
date of August 7, 1977 in the various PSD baseline areas (which derive
from the areas designated as attainment or unclassifiable by EPA under
section 107(d) of the Act) within Clark County. This definition is
consistent with EPA's 1978 final PSD regulations. However, the court in
the Alabama Power decision set aside EPA's definition (from the 1978
PSD regulations) in favor of the statutory definition of the term (see
section 169(4) of the Act), which links the baseline concentration to
the ambient concentration that exists at the time of the first PSD
application in a given area. See Alabama Power Co. v. Costle, 636 F.2d
323, at 375-376 (D.C. Cir. 1979). EPA's PSD regulations have long since
been revised to reflect the court's holding (see 40 CFR 51.166(b)(13)).
While the definition of ``baseline concentration'' in DAQM section
0 is consistent with the current EPA definition, EPA approval of this
definition to supercede the SIP definition would have the effect of
untriggering (completely) the minor source baseline dates for PM and
SO2 in those section 107(d) attainment or unclassifiable
areas in which no source or modification has submitted a complete PSD
application or would have a significant impact. Examples of such areas
include Frenchman Flat (hydrographic area (HA) 160), Indian Springs
Valley (HA 161), and Pahrump Valley (HA 162).
For those areas in which a source or modification has submitted a
complete PSD application or would have a significant impact, EPA
approval would have the effect of establishing a new minor source
baseline date for PM or SO2 or both, i.e., from August 7,
1977 to various different (more recent) dates in the applicable areas.
Examples include Las Vegas Valley (HA 212), which would have a new
minor source baseline date for SO2 of April 25, 1996
(triggered by a complete PSD application submitted by TIMET) and Black
Mountains (HA 215), which would have a new minor source baseline date
for PM of December 14, 1990 (triggered by a complete PSD application
submitted by NCA #2).
Arguably, untriggering (or re-establishing new, more recent) minor
source baseline dates represents a relaxation because a greater level
of air quality degradation would be allowed compared to a regulatory
scheme in which the baseline date and concentration is set uniformily
for all areas at August 7, 1977. However, this particular type of
change aligns the Clark County NSR program with the statute (see
section 169(4) of the Act) and thus, can also be viewed as a correction
rather than as a relaxation. We conclude, therefore, that approval of
the DAQM NSR submittal would serve the Congressional purposes described
in the Alabama Power decision, and that the untriggering (or re-
setting) of PSD minor source baseline dates in Clark County under these
circumstances would be consistent with section 110(l) of the Act.
Section 110(l) prohibits interference with any applicable requirement
of the Act, and in this case the SIP revision will bring the Clark
County program in line with the requirements of the Act as interpreted
by the court. Thus, EPA concludes that approval is consistent with
section 110(l). We also note that our approval of the DAQM NSR
submittal would have little practical effect on the PSD program as it
is being administered currently by DAQM since DAQM has not been
administering the program under the assumption that there is a uniform
county-wide minor source baseline date (i.e., as provided for in the
existing SIP NSR program) but rather under the assumption that the
minor source baseline date is triggered on an area-by-area basis by the
submittal of the first complete PSD application in a given area.
Carbon Monoxide (CO). As noted previously, a sub-region within
Clark County, the Las Vegas Valley (hydrographic area #212), is
designated as a ``serious'' nonattainment area for the CO NAAQS. Clark
County has developed and adopted a ``serious area'' attainment plan
which relies primarily on the Federal motor vehicle control program,
and State and local wintertime gasoline specifications (such as DAQM
sections 53 (Oxygenated Gasoline Program) and 54 (Cleaner Burning
Gasoline), and an ``enhanced'' motor vehicle inspection and maintenance
program to demonstrate attainment of the CO NAAQS by the applicable
attainment date (year 2000). We have proposed approval of this plan.
See 68 FR 4141 (January 28, 2003) for our proposed approval of the Las
Vegas Valley ``serious area'' CO attainment plan. The rest of the
county is designated unclassifiable/attainment for the CO NAAQS. See 40
CFR 81.329.
Approval of the DAQM NSR submittal (and thereby replacement or
supercession of the existing SIP NSR rules) would represent an
incremental relaxation in the control technology requirement for new or
modified non-major CO sources within Las Vegas Valley (i.e., from LAER
to BACT), but would also represent an incremental strengthening by
imposing more stringent offset requirements. The offset requirements
would be strengthened in two respects: the threshold for the offset
requirement would be lowered to 70 tons per year (tpy) from 100 tpy and
the offset ratio would be increased to 2:1 from 1:1. Given (1) that the
more inclusive ``actual-to-potential test'' would replace the
``potential-to-potential'' test for evaluating source modifications;
(2) that the incremental relaxation in the control technology
requirement would replace the highest level of control (LAER) with the
next highest (BACT) level of control and this incremental difference is
offset by an incremental strengthening in the offset requirement; (3)
that DAQM section 12 prohibits new or modified CO stationary sources
with potentials to emit (PTEs) greater than 50 tpy in the downtown CO
``hot spot'' area; (4) that the Las Vegas Valley ``serious area'' CO
attainment plan assumes growth in non-major stationary CO sources
(i.e., does not assume that the CO emissions from non-major sources
would be offset), concludes that stationary sources are
[[Page 31062]]
not a significant contributor to CO levels in the valley, and does not
rely on stationary source controls to demonstrate attainment; and (5)
that EPA has proposed approval of the CO attainment demonstration based
on on-road motor vehicle controls, we have concluded that the
supercession of the existing SIP NSR program by the submitted NSR
program would not interfere with the CO attainment strategy or any
other applicable requirement of the Act.
Particulate Matter (PM-10). As noted previously, Las Vegas Valley
(hydrographic area #212), is designated as a ``serious''
nonattainment area for the PM-10 NAAQS. Clark County has developed and
adopted a ``serious area'' attainment plan which relies primarily on
prohibitory rules regulating fugitive dust sources, including vehicle
travel over paved and unpaved roads and construction activity, to
demonstrate attainment of the PM-10 NAAQS by year 2006. We have
proposed approval of this plan. See 68 FR 2954 (January 22, 2003) for
our proposed approval of the Las Vegas Valley ``serious area'' PM-10
attainment plan. The rest of the county is designated on a hydrographic
area basis as ``unclassifiable'' for the PM-10 NAAQS, see 40 CFR
81.329, but PM-10 NAAQS violations have been recorded in Apex Valley,
which borders Las Vegas Valley to the north.
In general, approval of the DAQM NSR submittal would strengthen the
SIP by updating the PM increments in terms of PM-10 (rather than total
suspended particulate (TSP)). EPA replaced the PM NAAQS, measured as
TSP, with new PM NAAQS, measured as PM-10, in 1987. See 52 FR 24634
(July 1, 1987). With respect to Las Vegas Valley, approval of the DAQM
NSR submittal (and thereby replacement or supercession of the existing
SIP NSR rules) would represent an incremental relaxation in the control
technology requirement for new or modified non-major PM-10 sources
(i.e., from the most stringent level of control, LAER to the next
highest level of control, BACT), and in the offset requirement (from
``federal'' to ``local'' offsets) for new or modified sources with PTEs
from 15 tpy (as adjusted from 25 tons TSP) to 70 tpy, but it would also
represent an incremental strengthening by establishing a more stringent
offset ratio (2:1) to replace the current ratio (1:1). Given (1) that
the more inclusive ``actual-to-potential test'' would replace the
``potential-to-potential test'' for evaluating source modifications;
(2) that the offsetting effects of these changes to the NSR program
would ensure a negligible effect on PM-10 emissions; (3) that the
submitted NSR program conforms to that PM-10 attainment plan in that
the plan assumes BACT- rather than LAER-level of control for new or
modified non-major sources in Las Vegas; (4) that the Las Vegas Valley
``serious area'' PM-10 attainment plan concludes that stationary
sources are not a significant contributor to PM-10 NAAQS violations in
the valley, and does not rely on stationary source controls to
demonstrate attainment; and (5) that EPA has proposed approval of the
demonstration based on fugitive dust controls, we have concluded that
the supercession of the existing SIP NSR program by the submitted NSR
program would not interfere with the PM-10 attainment strategy or any
other applicable requirement of the Act.
With respect to Apex Valley, the incremental relaxation in the
control technology requirement (from LAER to BACT) and the elimination
of any offset requirement, when viewed in isolation, could appear to
potentially interfere with attainment of the PM-10 NAAQS in that area
given the monitored incidence of PM-10 NAAQS violations in the area.
However, EPA recognizes that Clark County is in the process of
extending additional regulatory controls to existing PM-10 sources in
the Apex Valley and to developing a Natural Events Action plan to
address those PM-10 NAAQS violations that result from high wind events
that occur there, and in that context, EPA believes that the
incremental relaxation in requirements for new or modified stationary
sources would not interfere with attainment of the PM-10 NAAQS in Apex
Valley since the attainment strategy, by necessity, will focus on
existing sources and high-wind-driven fugitive dust.
Ozone. Las Vegas Valley (hydrographic area #212) was
designated as a nonattainment area for the ozone NAAQS in 1978.
Pursuant to the Clean Air Act Amendments of 1977, Clark County
developed and adopted the Las Vegas Valley Air Quality Implementation
Plan in 1978 as an attainment plan for the ozone NAAQS. This plan was
revised in 1980 and then again in 1984. The attainment strategy relied
primarily on the Federal motor vehicle emission control program, the
NSR program (i.e., existing SIP sections 1, 11, and 15), and various
stationary source prohibitory rules (including SIP sections 33, 50, 51,
52, and 60), which relate to sources of chlorine (found to be a
significant ozone precursor in Las Vegas Valley) and VOC sources, such
as petroleum product storage and handling. We approved these plan
submittals at various times (see, e.g., 51 FR 29923, August 21, 1986).
Based on monitoring data documenting the necessary decrease in peak
ozone concentrations, we redesignated Las Vegas Valley as
``attainment'' for the (one-hour) ozone NAAQS in 1986. See 51 FR 41788
(November 19, 1986). Since then, peak ozone levels have remained
relatively constant at 0.09 parts per million (ppm) to 0.10 ppm, but
peak levels in recent years have approached the one-hour standard of
0.12 ppm. The current (one-hour) ozone NAAQS designation for Clark
County is unclassifiable/attainment. See 40 CFR 81.329.
Approval of the DAQM NSR submittal (and thereby replacement or
supercession of the existing SIP NSR rules) would represent an
incremental relaxation in the control technology requirement for new or
modified non-major VOC sources within Las Vegas Valley (i.e., from LAER
to BACT), however, the DAQM NSR submittal extends LAER level of control
to new or modified major VOC sources proposed for certain locations
adjacent to, and generally upwind of Las Vegas Valley (i.e., Eldorado
Valley and Ivanpah Valley. In these adjacent areas, the applicable
control technology requirement under the existing SIP NSR rules is
BACT. Given that the 1980's-era ozone attainment strategy relies on
several important VOC regulatory elements that would not be affected by
our action on the NSR program, e.g., stationary source prohibitory SIP
rules (i.e., SIP sections 33, 50, 51, 52, and 60) and motor vehicle
tailpipe and fuel regulations promulgated by EPA under title II of the
Act, and that the incremental relaxation in the control technology
requirement for new or modified sources of VOC in Las Vegas Valley
would replace the highest level of control (LAER) with the next highest
level of control (BACT) and would be partially offset by an incremental
strengthening in that requirement in upwind areas, we have concluded
that the approval of the DAQM NSR submittal (and thereby replacement or
supercession of the existing SIP NSR rules) would not interfere with
continued attainment of the one-hour ozone NAAQS or any other
applicable requirement of the Act. We note that Clark County has been
designated as nonattainment for the eight-hour ozone NAAQS, which EPA
established in 1997 (62 FR 38856, July 19, 1997) and which will in time
replace the existing (one-hour) ozone NAAQS. 69 FR 23858, 23919-23920
(April 30, 2004). Additional changes to the DAQM NSR program will be
required on a schedule
[[Page 31063]]
to be established by EPA in a final rule implementing the eight-hour
ozone NAAQS. See 69 FR 23951, 23985-23986 (April 30, 2004).
Nitrogen Dioxide (NO2). Clark County is designated on a
hydrographic area basis as unclassifiable/attainment for the
NO2 NAAQS. See 40 CFR 81.329. Ambient NO2
concentrations are well below (approximately 50%) the applicable NAAQS.
As a general matter, approval of the DAQM NSR submittal would
strengthen the SIP by establishing NO2 PSD increments and
requiring the related NO2 PSD increment consumption analysis
for new major sources or major modifications in Clark County. Within
Las Vegas Valley, approval of the DAQM NSR submittal (and thereby
replacement or supercession of the existing SIP NSR rules) would relax
the control technology requirement for new or modified sources of
NOX (from LAER to BACT), but this relaxation would be offset
by the special restrictions established in DAQM section 12 for new or
modified NOX sources in the urbanized core of Las Vegas.
From the standpoint of continued attainment of the NO2
NAAQS, while the net effect (negative or positive) of these offsetting
regulatory changes is difficult to predict, it would not be expected to
be significant given that the relaxed control technology requirement is
from the highest level of control (LAER) to the next highest level of
control (BACT) rather than an elimination of the control technology
requirement completely and given that, as noted above, ambient
NO2 concentrations are well below the applicable NAAQS.
Thus, we have concluded that the supercession of the existing SIP NSR
program by the submitted NSR program would not interfere with continued
attainment of the NO2 NAAQS or any other applicable
requirement of the Act.
Sulfur Dioxide (SO2). Clark County is designated on a
hydrographic area basis as unclassifiable/attainment for the
SO2 NAAQS. See 40 CFR 81.329. SO2 monitoring data
collected in Las Vegas Valley in the early 1980's indicate that the
highest ambient concentrations were between 5% and 22% of the
respective NAAQS depending upon the averaging period. Monitoring data
from year 2002 show little change in ambient SO2
concentrations relative to conditions in the early 1980's.
Approval of the DAQM NSR submittal (and thereby replacement or
supercession of the existing SIP NSR rules) would represent an
incremental relaxation in the control technology requirement for new or
modified SO2 sources within Las Vegas Valley (i.e., from
LAER to BACT) and an incremental relaxation in the ambient
SO2 standards used in the impact analyses conducted as part
of the permit application process for new or modified sources
(comparing the SO2 ambient standards in existing SIP section
11 with submitted DAQM section 11). From the standpoint of continued
attainment of the SO2 NAAQS, EPA concludes that the
incremental relaxation of the control technology requirement in Las
Vegas Valley for new or modified sources of SO2 is not
significant given that the relaxed requirement is from the highest
level of control (LAER) to the next highest level of control (BACT)
rather than an elimination of the control technology requirement
completely and given that ambient SO2 concentrations
continue to be well below the applicable NAAQS. Also, NDEP has
jurisdiction over one of the principal sources of SO2 (coal-
burning power plants) in Clark County, and the control technology
requirements for SO2 emissions from those sources are
unaffected by this action. Finally, the incremental relaxation in
SO2 ambient air quality standards used in the permit
application evaluation process is consistent with continued attainment
of the NAAQS since the revised ambient standards in submitted DAQM
section 11 accurately reflect the current NAAQS for SO2.
Thus, we have concluded that supercession of the existing SIP NSR
program by the submitted NSR program would not interfere with continued
attainment of the SO2 NAAQS or any other applicable
requirement of the Act.
Lead. EPA promulgated the NAAQS for lead (Pb) in 1978. See 43 FR
46246 (October 5, 1978). Ambient lead levels collected in Las Vegas
Valley during the late 1970's were found to violate the NAAQS. To
provide for the attainment and maintenance of the lead NAAQS in the
valley, Clark County adopted the State Implementation Plan Revision for
Ambient Lead in Las Vegas Valley, Clark County, Nevada (dated February
11, 1980). EPA approved this plan as a SIP revision in 1982. See 47 FR
28374 (June 30, 1982). This lead (Pb) attainment plan predicted
attainment of the lead NAAQS prior to 1982 primarily based on the
declining lead content of motor vehicle gasoline, and indeed, maximum
quarterly concentrations were much less than the NAAQS by the mid-1980's.
In general, the DAQM NSR submittal represents a strengthening of
the SIP with respect to lead in those portions of Clark County that lie
outside of Las Vegas Valley but an incremental relaxation of the SIP
within Las Vegas Valley. However, from the standpoint of continued
attainment of the lead NAAQS in Las Vegas Valley, the relaxation of
certain NSR requirements for new or modified stationary sources of lead
(de minimis exemptions, a BACT control technology requirement rather
than LAER, elimination of offsets) would not interfere with continued
attainment of the lead NAAQS nor any other requirement of the Act
because the incremental relaxation of the control technology
requirement is from the highest level of control (LAER) to the next
highest level of control (BACT) rather than an elimination of the
control technology requirement completely and because the DAQM NSR
submittal continues to ensure that permits are not issued to new or
modified sources that would cause a violation of the lead NAAQS (see
DAQM section 12, subsection 12.2.17.4(c)). Moreover, the overwhelming
influence of mobile sources to the historical lead NAAQS violations,
which would be unaffected by approval of the DAQM NSR submittal, and
the low background lead concentrations further ensure that supercession
of the existing NSR SIP program with the submitted NSR SIP program
would not interfere with continued attainment of the lead NAAQS or any
other requirement of the Act.
Section 193 of the Act
Section 193 of the Act, which was added by Congress in the Clean
Air Act Amendments of 1990, includes a savings clause which provides,
in pertinent part: ``No control requirement in effect, or required to
be adopted by an order, settlement agreement, or plan in effect before
November 15, 1990, in any area which is a nonattainment area for any
air pollutant may be modified after November 15, 1990, in any manner
unless the modification insures equivalent or greater emission
reductions of such air pollutant.'' This section of the Act does not
clearly apply to revisions in NSR programs, but we have evaluated the
DAQM NSR submittal on the assumption that section 193 does apply. NSR
program revisions are inherently difficult to evaluate with respect to
changes in emissions reductions because NSR covers all types of
stationary sources and provides for case-by-case evaluations of control
technology requirements whether the applicable requirement is BACT or
LAER (see 40 CFR 51.166(b)(12) and 40 CFR 51.165(a)(1)(xiii)). In the
context of the DAQM NSR submittal, a determination of whether the
submitted NSR program would provide for equivalent or greater
[[Page 31064]]
emission reductions relative to the existing SIP NSR program is further
complicated by the comprehensive nature of the changes. The DAQM NSR
submittal represents a wholesale revision affecting the substance,
procedure, and format of the Clark County NSR program. Nevertheless, we
can identify three parameters that most closely link to relative
changes in emissions reductions from new or modified stationary
sources: the test for evaluating source modifications, the control
technology review, and the requirements for offsets, including offset
thresholds, offset ratios, and the other specifications for creation
and use of offsets. As explained below, relaxation in some of these
parameters is offset by countervailing strengthenings in other
parameters with the net result that we can conclude that the submitted
NSR program will provide for equivalent or greater emissions reductions
as the existing SIP NSR program (which pre-dates the 1990 Clean Air Act
Amendments) for the two applicable nonattainment pollutants, CO and PM-10.
Test for Source Modifications. As noted previously, the submitted
DAQM NSR program would establish the more inclusive test (``actual to
potential'') for evaluating source modifications and thereby replace
the existing SIP NSR program's ``potential-to-potential'' test, with
the result that a greater number of source modifications would be
subject to new source review and the related requirements of BACT or LAER.
Control Technology Requirements. Under the existing SIP NSR
program, the highest level of control (LAER) applies to all new or
modified sources of CO or PM in the nonattainment area. In contrast,
under the submitted DAQM NSR program, the next highest level of
control, BACT, applies to new or modified sources of CO and PM with
PTEs less than 70 tpy. Under the submitted NSR program, LAER applies at
70 tpy or greater for CO and PM-10.
Offsets Requirements. Offsets requirements refer to applicable
thresholds, ratios, and specifications such as whether offsets are
surplus, permanent, quantifiable and federally enforceable. With
respect to offset thresholds, for CO, offsets under the existing SIP
NSR program apply to sources or modifications with PTEs greater than
100 tpy, whereas, under the submitted NSR program, offsets apply at 70
tpy. For PM, offsets under the existing SIP NSR program apply to
sources or modifications with PTEs greater than 25 tpy (based on TSP,
which is roughly equivalent to 15 tpy PM-10). The corresponding
threshold under the submitted NSR program is 70 tpy of PM-10. With
respect to offset ratios, for both CO and PM, the existing SIP NSR
program establishes a 1:1 ratio whereas the submitted NSR program
establishes a more stringent a 2:1 ratio. With respect to specific
characteristics of offsets, DAQM section 59 requires that offsets be
surplus, permanent, quantifiable and federally enforceable as defined
in DAQM section 0. See DAQM section 59, subsection 59.4.2.1, and the
related definitions in DAQM section 0. Section 15 does not have any
similar requirements for offsets.
Evaluation for Carbon Monoxide. First, as noted above, the
submitted program would establish the more inclusive ``actual-to-
potential'' test for evaluating source modifications. Second, the
submitted program would establish a lower threshold for triggering
offset requirements (70 tpy under the submitted NSR program versus 100
tpy under the existing SIP NSR program), would establish a higher
offset ratio (2:1 versus 1:1), and would establish the requirements for
creation and use of offsets (surplus, permanent, quantifiable and
federally enforceable) that ensure that emissions increases are truly
offset. Thus, two of the three parameters strongly support a conclusion
that the submitted program would provide equivalent or greater CO
emissions reductions relative to the existing SIP NSR program.
One of the three parameters, the control technology requirement, is
more stringent for non-major sources under the existing SIP NSR program
than under the submitted program. The existing SIP NSR program requires
LAER-level of control for non-major CO sources whereas the submitted
DAQM NSR program requires BACT-level of control for such sources. The
emissions reductions associated with application of LAER-level of
control relative to those associated with application of BACT-level of
control depend upon the type and size of proposed sources or
modifications. In some instances, due to the ``top-down'' approach used
in BACT analyses, which requires justification for not selecting LAER-
level of control before evaluating less stringent levels of control,
BACT is equivalent to LAER. This ``top-down'' approach for determining
BACT is described in detail in Chapter B of EPA's Draft New Source
Review Workshop Manual (October 1990). In most other instances, the
differences in emissions limitations between the two levels of control
are relatively small, particularly in relation to emissions that would
otherwise result from an uncontrolled source.
Thus, we have concluded that the CO emissions increase associated
with the incremental relaxation associated with the control technology
requirement for non-major sources, which should be relatively minor
given the small difference between emissions limitations under BACT
versus LAER in most circumstances, would be more than compensated for
by the more inclusive test for source modifications, the lower CO
offset threshold, the higher CO offset ratio, and the establishment of
other requirements for offsets that ensure that they truly offset
emissions from applicable new sources or modifications.
Evaluation for Particulate Matter. As noted above, the submitted
DAQM NSR program would establish the more inclusive ``actual-to-
potential'' test for evaluating source modifications.
The second parameter, the control technology requirement (LAER), is
more stringent for non-major sources under the existing SIP NSR program
than under the submitted program (BACT). As described above for CO,
however, the difference between the emissions reductions associated
with application of LAER-level of control relative to those associated
with application of BACT-level of control typically ranges from minor
to none at all.
With respect to requirements for PM offsets, the differences
between the existing SIP and submitted NSR programs are particularly
difficult to evaluate. On one hand, the existing SIP NSR program has
established a lower offset threshold at 25 tpy of TSP (which is roughly
equivalent to 15 tpy of PM-10), compared to 70 tpy of PM-10 under the
submitted program. On the other hand, the existing program has
established a lower offset ratio (1:1 versus 2:1).
Moreover, the ``quality'' of the offsets under the existing program
is lower than that required under the submitted program in two
respects. First, unlike the submitted program, the existing SIP NSR
program does not require that offsets be surplus, permanent,
quantifiable and federally enforceable and thus does not ensure that
increases in emissions are truly offset. Second, the existing SIP NSR
program allows TSP offsets to be used to offset increases in PM
emissions. Depending upon the particle size distribution of those TSP
offsets, it is possible that increases in PM-10 emissions under the
existing SIP NSR program would not be offset by PM-10 offsets at all.
In other words, a new source that generates particulate matter that is
largely or entirely of the particle size constituting PM-10 could be
``offset'' under the existing program
[[Page 31065]]
by another source whose PM emissions are largely or entirely of a
particle size not constituting PM-10 but still constituting TSP (TSP
includes particles roughly 30 microns in diameter or less). In such
circumstances, the PM-10 emissions increase at the new source would be
at most only partially offset since the ``offsets'' do not, or only
partially, constitute PM-10. In contrast, the submitted program, while
it does not require offsets for as many new sources as the existing
program (due to the higher offset threshold), does require that PM-10
emissions increases be offset by PM-10 offsets, i.e., where offsets are
required.
In conclusion, while we recognize the significant trade-offs in
emission reduction potential between the two NSR programs with respect
to PM-10, we have concluded that the PM-10 emissions increase
associated with the incremental relaxation associated with the control
technology requirement for non-major sources and the higher offset
threshold would be more than compensated for by the more inclusive test
for source modifications, the higher PM-10 offset ratio, the
establishment of other requirements for offsets that ensure that they
truly offset emissions from applicable new sources or modifications,
and the requirement to use PM-10 offsets rather than TSP offsets, only
some fraction of which constitutes PM-10.
Conclusion. For the reasons set forth above, we propose to find
that the submitted DAQM NSR program insures equivalent or greater
emissions reductions of CO and PM-10 as compared to the existing SIP
NSR program in compliance with section 193 of the Act.
Proposed Partial Approval
Pursuant to section 110(k)(3) of the Act, we propose a partial
approval of the submitted NSR rules. With the exceptions listed in the
following subsection of this notice, we propose approval of the
submitted NSR rules, including DAQM sections 0, 11, 12, 58, and 59 and
NAC 445B.22083, based on our determination that the rules comply with
applicable statutory and regulatory provisions requiring regulation of
stationary sources in general and requiring permit programs for major
stationary sources in particular, including section 110(a)(2)(C) and
parts C and D of title I of the Act. In support of this recommendation,
we have concluded that our approval of the submitted NSR rules (and
thereby replacement or supercession of the existing SIP NSR rules),
i.e., with the partial exception for certain definitions in existing
SIP section 1, complies with section 110(l) of the Act because the
untriggering (or re-setting) of the minor source baseline dates for PM
and SO2 would be consistent with the statutory purpose of
linking such dates with collection of actual air quality data and
because the relaxation of certain control technology and offset
requirements would not interfere with the strategy for attainment of
the CO and PM-10 NAAQS in Las Vegas Valley or the continued attainment
of the other NAAQS in Clark County.
Proposed Partial Disapproval
We are also proposing a partial disapproval of the DAQM NSR
submittal. A discussion of the individual subsections of the submittal
that we are proposing to disapprove is provided in the following
paragraphs.
1. We propose to disapprove submitted DAQM section 12, subsections
12.2.18 (HAP sources in Clark County) and 12.2.20 (Additional
Requirements for Stationary Sources with Beryllium, Mercury, Vinyl
Chloride, or Asbestos Emissions in Clark County) to avoid potential
confusion or conflict with the Federal NESHAPS/MACT regulatory program.
Regulations governing hazardous air pollutant (HAP) emissions are
generally not appropriate for incorporation into SIPs, which are
intended under the Act to assure attainment and maintenance of the
criteria air pollutants.
2. We propose to disapprove DAQM section 52, subsection 52.8
(Section 52 Offset Program), because it cannot be evaluated properly in
the absence of a SIP submittal of the entire rule (section 52). DAQM
revised subsection 52.8 to clarify the date when the emission reduction
credit program will expire, but the emission reduction credit program
is not a part of existing SIP section 52, different portions of which
were approved by EPA in 1981 (see 46 FR 21758, April 14, 1981) and in
1982 (see 47 FR 26386, June 18, 1982). Thus, consideration of this
latest revision should be conducted only as part of an evaluation of
the entire rule (i.e., DAQM section 52).
A partial disapproval is appropriate in this instance given the
explanation provided above and given that these three subsections
(i.e., DAQM section 12, subsections 12.2.18 and 12.2.20, and DAQM
section 52, subsection 52.8) are easily severable from the overall NSR
submittal.
Recommendations for Improvements to DAQM NSR Rules
The TSD describes rule deficiencies that do not preclude full
approval of the DAQM NSR submittal but are recommended for the next
time DAQM modifies the rules. These recommendations relate to such
topics as use of consistent terms, greater coordination with NDEP
concerning increment consumption, and consideration of any analysis of
the impact of a major source or major modification on air quality
related values in Class I areas provided by a Federal Land Manager or
other Federal official during the permit application review period and
provision of an explanation in the public notice in those instances
which DAQM disagrees with a finding of such Federal official.
II. Corrections to, or Clarification of, the Clark County Portion of
Nevada State Implementation Plan
In pertinent part, section 110(k)(6) of the Act provides that
whenever EPA determines that the EPA action approving, disapproving, or
promulgating any plan or plan revision (or part thereof) was in error,
EPA may in the same manner as the approval, disapproval, or
promulgation revise such action as appropriate without requiring any
further submission from the State. Such determination and the basis
thereof shall be provided to the State and public. The EPA interprets
this provision to authorize the Agency to make corrections to an
approval, disapproval, or promulgation of a SIP revision when it is
shown to EPA's satisfaction that an error occurred in failing to
consider or inappropriately considering information available to EPA at
the time of the approval, disapproval, or promulgation, or the
information made available at the time of approval, disapproval, or
promulgation is subsequently demonstrated to have been clearly inadequate.
Over the years, EPA has taken numerous actions on revisions to the
Clark County portion of the Nevada SIP. In the process, EPA has made
certain errors, or took certain actions that warrant clarification,
which are the subject of this proposed action. Each proposed correction
or clarification is summarized below. The TSD for this proposed action
provides additional discussion of these rules.
SIP section 1, subsections 1.79, Significant Source of Total
Chlorides, and 1.94, Total Chlorides. In the preamble to our final rule
approving these defined terms into the SIP (46 FR 43141; August 27,
1981), we said that we were taking no action on these two subsections,
but then we proceeded to codify them in the ``Identification of plan''
section of 40 CFR part 52, subpart
[[Page 31066]]
DD (Nevada). As a result, we inadvertently approved these two
subsections of local rule, SIP section 1 (Definitions), into the Clark
County portion of the Nevada SIP. We are proposing now to delete these
terms from the SIP and to codify this deletion by revising the
appropriate paragraph under 40 CFR part 52, subpart DD (Nevada),
section 1470 (Identification of plan).
Former SIP section 12, Upset, Breakdown, or Scheduled Maintenance.
EPA originally approved this rule into the SIP in 1973. See 38 FR 12702
(May 14, 1973). In 1981, we reversed course and disapproved it and
codified this disapproval by amending 40 CFR part 52, section 1478
(then entitled ``Rules and Regulations''). See 46 FR 43141 (August 27,
1981). Subsequently, Clark County renumbered its air pollution
regulations and submitted a local rule (section) 25 also entitled
``Upset, Breakdown, or Scheduled Maintenance,'' which we disapproved in
1984. See 49 FR 10259 (March 20, 1984). In that 1984 final rule, we
codified our disapproval of submitted section 25 by amending 40 CFR
52.1483, but we also removed and reserved 40 CFR 52.1478 which had
included the 1981 disapproval language related to section 12 (Upset,
Breakdown, or Scheduled Maintenance). (Note that 40 CFR 52.1478 has
subsequently been renamed ``Extensions.'') The end result of this
sequence of rulemaking is that, while section 12 (Upset, Breakdown, or
Scheduled Maintenance), originally approved by EPA in 1973, is no
longer approved into the Nevada SIP (ever since disapproval action in
1981), the current codification of the Nevada SIP in subpart DD
(Nevada) of 40 CFR part 52 is not clear on this point. Therefore, we
are proposing to clarify the status of former SIP (now disapproved)
section 12 (Upset, Breakdown, or Scheduled Maintenance), as submitted
on January 19, 1973, by revising the appropriate paragraph under 40 CFR
part 52, subpart DD (Nevada), section 1470 (Identification of plan).
SIP Section 15, Prohibition of Nuisance Conditions. EPA approved
this rule into the Nevada SIP in 1973. See 38 FR 12702 (May 14, 1973).
Clark County later renumbered its air quality regulations, and we
subsequently approved a new local rule (section) 15 (Source
Registration) into the SIP. That new SIP section 15 (Source
Registration) had nothing to do with general nuisance conditions and
thus did not supercede the old SIP rule 15 (Prohibition of Nuisance
Conditions) in the Nevada SIP. However, general nuisance rules, such as
SIP section 15 (Prohibition of Nuisance Conditions) are not appropriate
for inclusion in SIPs, because they are not specifically directed at
the attainment and maintenance of the NAAQS, and therefore, we are
proposing to delete section 15 (Prohibition of Nuisance Conditions)
from the SIP and to codify this deletion by revising the appropriate
paragraph under 40 CFR part 52, subpart DD (Nevada), section 1470
(Identification of plan).
Disapproved section 25, subsection 25.1, untitled, but related to
upset, breakdown or scheduled maintenance. In 1981, we disapproved this
rule, which had been submitted to us on July 24, 1979. See 46 FR 43141
(August 27, 1981). Through that 1981 action, we listed this rule in the
``Identification of plan'' section of 40 CFR part 52, subpart DD
(Nevada) but canceled out the apparent approval by codifying the
corresponding disapproval in 40 CFR 52.1478. In 1984, we disapproved an
amended version of local Clark County rule, section 25 (Upset,
Breakdown, or Scheduled Maintenance), which had been submitted to us on
November 17, 1981. See 49 FR 10259 (March 20, 1984). In the 1984
action, we codified our disapproval of section 25 (Upset, Breakdown, or
Scheduled Maintenance), submitted on November 17, 1981, by amending 40
CFR 52.1483, but we also removed and reserved 40 CFR 52.1478 (then
entitled ``Rules and Regulations''), which had included the 1981
disapproval language related to section 25, subsection 25.2, as
submitted on July 24, 1979. By removing the disapproval language but
retaining the listing of section 25, subsection 25.1, in the
``Identification of plan'' section of 40 CFR part 52, subpart DD
(Nevada), we have inadvertently caused potential confusion as to the
status of this particular rule with respect to the Nevada SIP. To
eliminate this confusion, we are proposing to delete the listing of
section 25, subsection 25.1 (untitled, but related to upset, breakdown
or scheduled maintenance), by revising the appropriate paragraph under
40 CFR part 52, subpart DD (Nevada), section 1470 (Identification of
plan).
SIP section 29 (Odors in the Ambient Air). EPA originally approved
this rule into the SIP in 1973. See 38 FR 12702 (May 14, 1973). Clark
County later renumbered its air pollution regulations, and we
subsequently approved a new local rule (section) 29 (Sulfur Content in
Fuel Oil) into the SIP. See 46 FR 43141 (August 27, 1981). The new SIP
section 29 (Sulfur Content in Fuel Oil) was completely different than
the old SIP section 29 (Odors in the Ambient Air) and thus did not
supercede it, nor have we taken specific action to delete the old SIP
section 29 (Odors in the Ambient Air) from the Nevada SIP. Thus,
section 29 (Odors in the Ambient Air), submitted on January 19, 1973,
remains in the Nevada SIP. Odor nuisance rules are generally not
appropriate for inclusion in the SIP, because they are not specifically
directed at the attainment and maintenance of the NAAQS. Therefore, we
are proposing to delete section 29 (Odors in the Ambient Air),
submitted on January 19, 1973, from the Nevada SIP and to codify the
deletion by revising the appropriate paragraph under 40 CFR part 52,
subpart DD (Nevada), section 1470 (Identification of plan).
SIP section 33, Chlorine in Chemical Processes. This local rule was
adopted on May 18, 1984, and was included in the Las Vegas Valley Air
Quality Implementation Plan, Post 1982 Update for Ozone, which was
adopted by Clark County on October 16, 1984, submitted by NDEP on
January 11, 1985, and approved by EPA as a SIP revision on August 21,
1986 (51 FR 29923). The codification of our approval of the post-1982
ozone plan, however, does not provide a separate listing of section 33,
which could result in confusion as to the status of that rule with
respect to the SIP. See 40 CFR 52.1470(c)(33). To clarify its status as
an approved part of the Nevada SIP, we are proposing to revise 40 CFR
52.1470(c)(33) to provide for a specific listing for section 33
(Chlorine in Chemical Processes).
SIP section 40, subsection 40.1, Prohibition of Nuisance
Conditions; SIP section 42, subsection 42.2, untitled but related to
nuisance from open burning; and SIP section 43, subsection 43.1, Odors
in the Ambient Air. These three rules were submitted to EPA on July 24,
1979. In 1981, we took final action on the portion of the July 24, 1979
submittal that included these three rules. See 46 FR 43141 (August 27,
1981). In that rulemaking, we indicated that we were taking no action
on the three rules, but we inadvertently listed them as approved into
the SIP. See 40 CFR 52.1470(c)(16)(viii). Therefore, we are proposing
to revise 40 CFR 52.1470(c)(16)(viii) to delete SIP section 40,
subsection 40.1 (Prohibition of Nuisance Conditions), SIP section 42,
subsection 42.2 (untitled but related to nuisance from open burning),
and SIP section 43, subsection 43.1 (Odors in the Ambient Air),
submitted on July 24, 1979, from the Nevada SIP.
Conclusion. EPA has reviewed the rules described above and
determined that they were previously approved in
[[Page 31067]]
error into the Clark County portion of the Nevada SIP (SIP sections
1.79, 1.94, 15, 29, 40.1, 42.2, and 43.1), or were previously
disapproved but not clearly identified as such in the CFR (former SIP
section 12 and disapproved submitted section 25.1), or were not clearly
listed as approved (SIP section 33). Deletion of those rules approved
in error into the SIP will not relax the applicable SIP and is
consistent with the Act. Therefore, EPA is proposing to delete them and
to clarify the status of the other listed rules under section 110(k)(6)
of the Act, which provides EPA with the authority to take these actions
without additional State submission.
III. Proposed Action and Public Comment
As authorized under section 110(k)(3) of the Act, EPA is proposing
a partial approval and partial disapproval of the revised Clark County
NSR rules into the Nevada SIP. We are proposing to approve submitted
DAQM sections 0, 11, 12 (except subsections 12.2.18 and 12.2.20), 58,
and 59 and submitted State regulation NAC 445B.22083. We are proposing
to disapprove submitted DAQM section 12, subsections 12.2.18 and
12.2.20, and submitted DAQM section 52, subsection 52.8.
If finalized, this action would incorporate those provisions of the
submitted rules that we are approving into the SIP and would not
incorporate those provisions that we are disapproving. Also, if
finalized as proposed, the submitted rules will supercede the existing
SIP rules that provide for permitting of new or modified stationary
sources in Clark County, including all of existing SIP sections 11 and
15, as well as most of the defined terms in existing SIP section 1, and
will withdraw EPA's nonattainment area visibility FIP authority as it
relates to new source review by DAQM in Clark County (see 40 CFR
52.1488(b)). If this partial disapproval is finalized, sanctions will
not be imposed under section 179 of the Act because the provisions that
we are proposing to disapprove are not required SIP submissions.
With respect to the two local rules entitled ``Definitions,'' if we
finalize this action as proposed, we would approve submitted DAQM
section 0 (Definitions) in its entirety, including those terms not
directly related to NSR, but we would retain 33 defined terms from SIP
section 1 (Definitions) because there are no equivalent, corresponding
terms and definitions in DAQM section 0, and thus, these terms may be
needed for existing SIP rules unaffected by this action. The 33 defined
terms from SIP section 1 to be retained include: Affected Facility
(1.1), Air Contaminant (1.3), Air Pollution Control Committee (1.6),
Area Source (1.11), Atmosphere (1.12), Board (1.16), Commercial Off-
Road Vehicle Racing (1.23), Dust (1.26), Existing Facility (1.28),
Existing Gasoline Station (1.29), Fixed Capital Cost (1.30), Fumes
(1.36), Health District (1.40), Hearing Board (1.41), Integrated
Sampling (1.44), Minor Source (1.50), Mist (1.51), New Gasoline Station
(1.57), New Source (1.58), NIC (1.60), Point Source (1.70), Shutdown
(1.78), Significant (unnumbered), Single Source (1.81), Smoke (1.83),
Source of Air Contaminant (1.84), Special Mobile Equipment (1.85),
Standard Commercial Equipment (1.87), Standard Conditions (1.88), Start
Up (1.89), Stop Order (1.91), Uncombined Water (1.95), and Vapor
Disposal System (1.97). The TSD provides additional information on the
proposed partial supercession of existing SIP section 1.
Second, in recognition of the vacature of our approval of previous
versions of the Clark County NSR rules in Hall v. EPA, we propose to
delete 40 CFR 52.1470(c)(36) and (37).
Third, under section 110(k)(6), we are proposing to correct certain
provisions of the Clark County portion of the Nevada SIP that were
incorporated into the SIP in error and to revise certain provisions of
the Clark County portion of the Nevada SIP that warrant clarification.
Specifically, we are proposing to delete SIP section 1, subsections
1.79 (Significant source of total chlorides'') and 1.94 (Total
Chlorides); SIP section 15 (Prohibition of Nuisance Conditions); SIP
section 29 (Odors in the Ambient Air); SIP section 40, subsection 40.1
(Prohibition of Nuisance Conditions); SIP section 42, subsection 42.2
(untitled but related to nuisance from open burning); and SIP section
43, subsection 43.1 (Odors in the Ambient Air), from the appropriate
paragraphs of section 1470 (``Identification of plan'') of 40 CFR part
52, subpart DD (Nevada). If finalized as proposed, this action will
delete these rules from the federally enforceable SIP. We are also
proposing to revise the appropriate paragraphs in 40 CFR 52.1470 to
clarify that former SIP section 12 (Upset, Breakdown, or Scheduled
Maintenance) and submitted section 25.1 (untitled, but related to
upset, breakdown, or scheduled maintenance) have been disapproved and
are not approved into the Nevada SIP, and to clarify that SIP section
33 (Chlorine in Chemical Processes) was, and continues to be, approved
into the Nevada SIP as part of our approval of the overall post-1982
ozone plan for Las Vegas Valley.
We are soliciting public comment on all aspects of this proposal.
These comments will be considered before taking final action. To
comment on today's proposal, you should submit comments by mail (in
triplicate if possible) as described in the ADDRESSES section listed in
the front of this document. EPA will consider any written comments
received by July 2, 2004.
IV. Statutory and Executive Order Reviews
Under Executive Order 12866 (58 FR 51735, October 4, 1993), this
proposed action is not a ``significant regulatory action'' and
therefore is not subject to review by the Office of Management and
Budget. For this reason, this action is also not subject to Executive
Order 13211, ``Actions Concerning Regulations That Significantly Affect
Energy Supply, Distribution, or Use'' (66 FR 28355, May 22, 2001). This
proposed action merely proposes to approve state law as meeting Federal
requirements and imposes no additional requirements beyond those
imposed by state law. Accordingly, the Administrator certifies that
this proposed rule will not have a significant economic impact on a
substantial number of small entities under the Regulatory Flexibility
Act (5 U.S.C. 601 et seq.). Because this rule proposes to approve pre-
existing requirements under state law and does not impose any
additional enforceable duty beyond that required by state law, it does
not contain any unfunded mandate or significantly or uniquely affect
small governments, as described in the Unfunded Mandates Reform Act of
1995 (Public Law 104-4).
This proposed rule also does not have tribal implications because
it will not have a substantial direct effect on one or more Indian
tribes, on the relationship between the Federal Government and Indian
tribes, or on the distribution of power and responsibilities between
the Federal Government and Indian tribes, as specified by Executive
Order 13175 (59 FR 22951, November 9, 2000). This action also does not
have Federalism implications because it does not have substantial
direct effects on the States, on the relationship between the national
government and the States, or on the distribution of power and
responsibilities among the various levels of government, as specified
in Executive Order 13132 (64 FR 43255, August 10, 1999). This action
merely proposes to approve a state rule implementing a Federal
standard, and does not alter the relationship or the
[[Page 31068]]
distribution of power and responsibilities established in the Clean Air
Act. This proposed rule also is not subject to Executive Order 13045
``Protection of Children from Environmental Health Risks and Safety
Risks'' (62 FR 19885, April 23, 1997), because it is not economically
significant.
In reviewing SIP submissions, EPA's role is to approve state
choices, provided that they meet the criteria of the Clean Air Act. In
this context, in the absence of a prior existing requirement for the
State to use voluntary consensus standards (VCS), EPA has no authority
to disapprove a SIP submission for failure to use VCS. It would thus be
inconsistent with applicable law for EPA, when it reviews a SIP
submission, to use VCS in place of a SIP submission that otherwise
satisfies the provisions of the Clean Air Act. Thus, the requirements
of section 12(d) of the National Technology Transfer and Advancement
Act of 1995 (15 U.S.C. 272 note) do not apply. This proposed rule does
not impose an information collection burden under the provisions of the
Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.).
List of Subjects in 40 CFR Part 52
Environmental protection, Air pollution control, Carbon monoxide,
Intergovernmental relations, Lead, Nitrogen dioxide, Ozone, Particulate
matter, Reporting and recordkeeping requirements, Sulfur oxides,
Volatile organic compound.
Dated: May 24, 2004.
Laura Yoshii,
Acting Regional Administrator, Region IX.
[FR Doc. 04-12412 Filed 6-1-04; 8:45 am]
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