Approval and Promulgation of Implementation Plans Indiana:
Revised Mobile Source Inventories and Motor Vehicle Emissions Budgets
for 2005 and 2007 Using MOBILE6
[Federal Register: August 26, 2004 (Volume 69, Number 165)]
[Rules and Regulations]
[Page 52427-52431]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr26au04-5]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 52
[R05-OAR-2004-IN-0003; FRL-7806-5]
Approval and Promulgation of Implementation Plans Indiana:
Revised Mobile Source Inventories and Motor Vehicle Emissions Budgets
for 2005 and 2007 Using MOBILE6
AGENCY: Environmental Protection Agency (EPA).
ACTION: Direct final rule.
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SUMMARY: EPA is approving Indiana's August 6, 2004, submittal of
revised mobile emission inventories and 2005 and 2007 motor vehicle
emissions budgets (MVEBs) which have been developed using MOBILE6, an
updated model for calculating mobile emissions of ozone precursors.
These inventories and associated motor vehicle emissions budgets are
part of the 1-hour ozone attainment plan approved for the Northwest
Indiana area. The Northwest Indiana area consists of Lake and Porter
Counties in Indiana. The State's submittal meets a commitment by the
State of Indiana to revise and resubmit the MVEBs using MOBILE6 methods
within two years following EPA's release of MOBILE6, provided that
transportation conformity is not determined without adequate MOBILE6-
based MVEBs during the second year. The lack of approved motor vehicle
emissions budgets has resulted in an administrative freeze on
transportation conformity in this area. The approval of these budgets
will allow transportation conformity determinations to be made in
Northwest Indiana.
DATES: This ``direct final'' rule is effective on October 12, 2004,
unless EPA receives adverse written comments by September 27, 2004. If
adverse comment is received, EPA will publish a timely withdrawal of
the rule in the Federal Register and inform the public that the rule
will not take effect.
ADDRESSES: Submit comments, identified by Docket ID No. R05-OAR-2004-
IN-0003 by one of the following methods: Federal eRulemaking Portal:
http://www.regulations.gov. Follow the on-line instructions
for submitting comments.
E-mail: bortzer.jay@epa.gov.
Fax: (312) 886-5824.
Mail: You may send written comments to: J. Elmer Bortzer, Chief,
Air Programs Branch, (AR-18J), Environmental Protection Agency, 77 West
Jackson Boulevard, Chicago, Illinois 60604.
Hand delivery: Deliver your comments to: J. Elmer Bortzer, Chief,
[[Page 52428]]
Air Programs Branch (AR-18J), U.S. Environmental Protection Agency,
Region 5, 77 West Jackson Boulevard, 18th floor, Chicago, Illinois 60604.
Such deliveries are only accepted during the Regional Office's
normal hours of operation. The Regional Office's official hours of
business are Monday through Friday, 8:30 a.m. to 4:30 p.m. excluding
Federal holidays.
Instructions: Direct your comments to Docket ID No. R05-OAR-2004-
IN-0003. EPA's policy is that all comments received will be included in
the public docket without change, including any personal information
provided, unless the comment includes information claimed to be
Confidential Business Information (CBI) or other information whose
disclosure is restricted by statute. Do not submit information that you
consider to be CBI or otherwise protected through regulations.gov, or
e-mail. The federal regulations.gov Web site is an ``anonymous access''
system, which means EPA will not know your identity or contact
information unless you provide it in the body of your comment. If you
send an e-mail comment directly to EPA without going through
regulations.gov, your e-mail address will be automatically captured and
included as part of the comment that is placed in the public docket and
made available on the Internet. If you submit an electronic comment,
EPA recommends that you include your name and other contact information
in the body of your comment and with any disk or CD-ROM you submit. If
EPA cannot read your comment due to technical difficulties and cannot
contact you for clarification, EPA may not be able to consider your
comment. Electronic files should avoid the use of special characters,
any form of encryption, and be free of any defects or viruses. For
additional instructions on submitting comments, go to Section I of the
SUPPLEMENTARY INFORMATION section of the related proposed rule which is
published in the Proposed Rules section of this Federal Register.
Docket: All documents in the docket are listed in the EDOCKET index
at http://www.epa.gov/edocket. Although listed in the index, some
information is not publicly available, i.e., Confidential Business
Information (CBI) or other information whose disclosure is restricted
by statute. Publicly available docket materials are available either
electronically in EDOCKET or in hard copy at Environmental Protection
Agency, Region 5, Air and Radiation Division, 77 West Jackson
Boulevard, Chicago, Illinois 60604. (We recommend that you telephone
Patricia Morris, Environmental Scientist, at (312) 353-8656 before
visiting the Region 5 office.) This facility is open from 8:30 a.m. to
4:30 p.m., Monday through Friday, excluding legal holidays.
FOR FURTHER INFORMATION CONTACT: Patricia Morris, Environmental
Scientist, Criteria Pollutant Section, Air Programs Branch (AR-18J),
EPA Region 5, 77 West Jackson Boulevard, Chicago, Illinois 60604, (312)
353-8656. morris.patricia@epa.gov.
SUPPLEMENTARY INFORMATION:
I. General Information
A. Does This Action Apply To Me?
B. How Can I Get Copies of This Document and Other Related Information?
C. How and To Whom Do I Submit Comments?
II. What Is the Background for This Action?
III. What Action Is EPA Taking Today?
IV. What Changes Were Made to the Northwest Indiana 1-Hour Ozone MVEBs?
V. What is Transportation Conformity?
VI. What is a MVEB?
VII. How Does This Action Change Implementation of Transportation
Conformity for the Northwest Indiana Area?
VIII. What Is the Action?
IX. Did Indiana Hold A Public Hearing?
X. Statutory and Executive Order Review
I. General Information
A. Does This Action Apply To Me?
This action is rulemaking on a non-regulatory planning document
intended to ensure the continued progress toward good air quality in
the Northwest Indiana (Lake and Porter Counties) Area. This action will
allow transportation planning to proceed in Northwest Indiana.
B. How Can I Get Copies of This Document and Other Related Information?
1. The Regional Office has established an electronic public
rulemaking file available for inspection on EDOCKET and a hard copy
file which is available for inspection at the Regional Office. EPA has
established an official public rulemaking file for this action under
Docket ID No. R05-OAR-2004-IN-0003. The official public file consists
of the documents specifically referenced in this action, any public
comments received, and other information related to this action.
Although a part of the official docket, the public rulemaking file does
not include Confidential Business Information (CBI) or other
information whose disclosure is restricted by statute. The official
public rulemaking file is the collection of materials that is available
for public viewing at the Air Programs Branch, Air and Radiation
Division, EPA Region 5, 77 West Jackson Boulevard, Chicago, Illinois
60604. EPA requests that if at all possible, you contact the person
listed in the For Further Information Contact section to schedule your
inspection. The Regional Office's official hours of business are Monday
through Friday, 8:30 a.m. to 4:30 p.m. excluding Federal holidays.
2. Electronic Access. You may access this Federal Register document
electronically through the regulations.gov Web site located at
http://www.regulations.gov where you can find, review, and
submit comments on Federal rules that have been published in the Federal
Register, the Government's legal newspaper, and are open for comment.
For public commenters, it is important to note that EPA's policy is
that public comments, whether submitted electronically or in paper,
will be made available for public viewing at the EPA Regional Office,
as EPA receives them and without change, unless the comment contains
copyrighted material, CBI, or other information whose disclosure is
restricted by statute. When EPA identifies a comment containing
copyrighted material, EPA will provide a reference to that material in
the version of the comment that is placed in the official public
rulemaking file. The entire printed comment, including the copyrighted
material, will be available at the Regional Office for public inspection.
C. How and To Whom Do I Submit Comments?
You may submit comments electronically, by mail, or through hand
delivery/courier. To ensure proper receipt by EPA, identify the
appropriate rulemaking identification number by including the text
``Public comment on proposed rulemaking Region 5 Air Docket ``R05-OAR-
2004-IN-0003'' in the subject line on the first page of your comment.
Please ensure that your comments are submitted within the specified
comment period. Comments received after the close of the comment period
will be marked ``late.'' EPA is not required to consider these late
comments.
For detailed instructions on submitting public comments and on what
to consider as you prepare your comments see the ADDRESSES section and
the section I General Information of the SUPPLEMENTARY INFORMATION
section of the related proposed rule which is published in the Proposed
Rules section of this Federal Register.
[[Page 52429]]
II. What Is the Background for This Action?
In November of 1999, EPA issued two memoranda \1\ to articulate its
policy regarding states that incorporated MOBILE5-based interim Tier 2
standard \2\ benefits into their State Implementation Plans (SIPs) and
MVEBs. Although these memoranda primarily targeted certain serious and
severe ozone nonattainment areas, EPA has implemented this policy in
all other areas that have made use of federal Tier 2 benefits in air
quality plans from EPA's April 2000 MOBILE5 guidance, ``MOBILE5
Information Sheet #8: Tier 2 Benefits Using MOBILE5.'' All
states whose attainment demonstrations or maintenance plans include
interim MOBILE5-based estimates of the Tier 2 standards were required
to make a commitment to revise and resubmit their MVEBs within either
one or two years of the final release of MOBILE6 in order to gain SIP
approval.
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\1\ Memoranda, ``Guidance on Motor Vehicle Emissions Budgets in
1-Hour Ozone Attainment Demonstrations,'' issued November 3, 1999,
and ``1-Hour Ozone Attainment Demonstrations and Tier2/Sulfur
Rulemaking,'' issued November 8, 1999. Copies of these memoranda are
on EPA's Web site at http://www.epa.gov/otaq/transp/traqconf.htm.
\2\ The final rule on Tier 2 Motor Vehicle Emissions Standards
and Gasoline Sulfur Control Requirements (``Tier 2 standards'') for
passenger cars, light trucks, and larger passenger vehicles was
published on February 10, 2000 (65 FR 6698).
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EPA officially released the MOBILE6 motor vehicle emissions factor
model on January 29, 2002 (67 FR 4254). Thus, the effective date of
that Federal Register action constituted the start of the two-year time
period in which Indiana was required to revise the maintenance plan
SIPs using the MOBILE6 model.
MOBILE5b, as released, did not allow the user to estimate the
emission reduction credits for the Tier 2/Low Sulfur rule. This
situation existed since the Tier 2 rule was promulgated after the
release of MOBILE5b. Therefore, in order to allow areas that wanted to
claim emission reduction credit for the Tier 2/Low Sulfur rule to
estimate the benefits, EPA provided a method to estimate those
reductions. This MOBILE5b approximation methodology represented the
information available for use in on-road mobile source modeling at that
time when MOBILE5b was the approved model. EPA recognized these
approximations could change as more data are analyzed and incorporated
into the next version of the MOBILE model, MOBILE6. EPA required areas
that used the MOBILE5b approximation method to resubmit MVEBs
recalculated with MOBILE6. Specifically, EPA established a policy that
MVEBs would not be approved as being adequate for purposes of
conformity unless the SIP also included an enforceable commitment to
revise and resubmit the MVEBs using MOBILE6 methods within one year
after the EPA released MOBILE6 or, alternatively, within two years
following the release of MOBILE6, provided that transportation
conformity is not determined in the area without adequate MOBILE6-based
MVEBs during the second year. Based on this policy, EPA required
Indiana to update the MVEBs in the 1-hour ozone attainment
demonstration for Northwest Indiana within two years after the release
of MOBILE6. In addition, any new conformity analysis in the area cannot
be found to conform during the second year until MVEBs based on MOBILE6
calculations are found adequate (November 13, 2001, 66 FR 56944). For a
more detailed explanation of EPA's rationale for this policy, please
refer to the January 18, 2002, ``Policy Guidance on the Use of MOBILE6
for SIP Development and Transportation Conformity'' (http://www.epa.gov/
otaq/models/mobile6/m6policy.pdf).
III. What Action Is EPA Taking Today?
EPA is approving revisions to the Indiana SIP submitted by the
Indiana Department of Environmental Management (IDEM). The SIP revision
request was originally submitted on July 2, 2004, with a request to
parallel process the draft revision. The state public comment period
ended on July 30, 2004, and IDEM submitted the final SIP revision
request on August 6, 2004. The State's revisions update the MVEBs for
the years 2005 and 2007 and also update the projected mobile source
emissions (upon which the MVEBs are based) using MOBILE6 for Lake and
Porter Counties in Indiana, which are part of the Chicago 1-hour severe
ozone nonattainment area. These revisions meet the requirements
established in the final approval of the attainment demonstration
(November 13, 2001, 66 FR 56944). These revisions also meet the
criteria in the January 18, 2002, Guidance document, ``Policy Guidance
on the Use of MOBILE6 for SIP Development and Transportation Conformity.''
IV. What Changes Were Made to the Northwest Indiana 1-Hour Ozone MVEBs?
Indiana revised MVEBs and mobile source emissions using MOBILE6.2,
the current version of MOBILE6, and using the latest population and
transportation model updates. The revised 2005 MVEB for the Lake and
Porter County area is 15.18 tons per summer day (tpd) for Volatile
Organic Compounds (VOC). The revised 2007 MVEBs for the Lake and Porter
County area are 12.37 tpd VOC and 63.33 tpd for Nitrogen Oxides
(NOX) (Please refer to the table below for details.)
Table 1 below summarizes the revised motor vehicle emissions
inventories for VOC for the Lake and Porter County area in pounds (lbs)
per summer day. These revised inventories were developed using the
latest planning assumptions, including vehicle registration data,
vehicle miles traveled (VMT), speeds, fleet mix, and SIP emission
control measures. These inventories meet the Rate of Progress (ROP)
targets for the Lake and Porter County area. Indiana was required to
reduce VOC emissions by nine percent between 2002 to 2005. In the
original ROP Plan, Indiana had additional emission reductions above and
beyond what was required. The approved ROP Plan had an extra reduction
of 7,852 lbs. per summer day. The extra creditable reductions were
primarily from the shutdown of certain steel operations. The Indiana
ROP Plan was approved as part of the attainment demonstration approval
on November 13, 2001, (66 FR 56944).
Northwest Indiana Anthropogenic Emissions
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State Source category VOC 1990 VOC 2005 VOC 2007
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Indiana.... Point.......... 350,771 98,560 99,579
Area........... 83,821 65,669 66,595
Mobile......... 71,560 30,351 24,738
Nonroad........ 23,367 16,611 13,326
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[[Page 52430]]
Total........................... 529,519 211,191 204,238
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The Indiana submittal also addresses the 6% ROP emission reduction
needed for the years 2005 to 2007. Again, Indiana had additional VOC
emissions in the originally approved ROP Plan. These additional
emissions are above and beyond the 3% contingency requirements which
were also met and approved. Indiana has used the additional, excess
emissions reductions by allocating them to the mobile source sector for
the emissions budgets. By using the excess emission reductions, Indiana
no longer has additional excess ROP emissions in the approved ROP Plan.
IDEM and EPA also reviewed planning assumptions for the point,
area, and nonroad source categories to ensure there have been no major
changes since approval of the attainment demonstration. The emissions
for point, area, and nonroad source categories are shown in Table 1, in
addition to the mobile source emissions.
EPA has articulated its policy regarding the use of MOBILE6 in SIP
development in its ``Policy Guidance on the Use of MOBILE6 for SIP
Development and Transportation Conformity'' \3\ and ``Clarification of
Policy Guidance for MOBILE6 in Mid-course Review Areas.'' \4\
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\3\ Memorandum, ``Policy Guidance on the Use of MOBILE6 for SIP
development and Transportation Conformity,'' issued January 18,
2002. A copy of this memorandum can be found on EPA's Web site at
http://www.epa.gov/otaq/transp/traqconf.htm.
\4\ Memorandum, ``Clarification of Policy Guidance for MOBILE6
SIPs in Mid-course Review Areas,'' issued February 12, 2003. A copy
of this memorandum can be found on EPA's Web site at http://www.epa.gov/
otaq/transp/traqconf.htm.
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Consistent with this policy guidance, Indiana's August 6, 2004,
submittal includes urban airshed modeling results to show that its 1-
Hour Ozone Attainment Demonstration Plan continues to demonstrate
attainment using revised MOBILE6 inventories for the Northwest Indiana
area and the entire Lake Michigan area. The State's methodology for the
urban airshed modeling consisted of modeling the critical episode from
1995 with the increased emissions in Northwest Indiana to determine if
attainment will still be predicted by the established 2007 attainment
date. The emissions were increased by a 5% margin to assure that, even
with extra emissions, the area would demonstrate attainment. The
modeling showed that the regional strategy met the three benchmarks in
EPA's 1-hour attainment test (``Guidance on Use of Modeled Results to
Demonstrate Attainment of the Ozone NAAQS'', June 1996). The benchmarks
set limits on the number of modeled exceedance days. All three of the
benchmarks were met by the modeling that considered increased emissions.
Indiana's August 6, 2004 submittal satisfies the conditions
outlined in EPA's MOBILE6 Policy guidance, and demonstrates that the
new levels of motor vehicle emissions calculated using MOBILE6 continue
to support achievement of the projected attainment of the 1-Hour Ozone
NAAQS by the attainment date of November 15, 2007, for the Northwest
Indiana area.
V. What Is Transportation Conformity?
Transportation conformity means that the level of emissions from
the transportation sector (i.e., cars, trucks and buses) must be
consistent with the requirements in the SIP to attain and maintain the
National Ambient Air Quality Standard (NAAQS). The Clean Air Act, in
section 176(c), requires conformity of transportation plans, programs
and projects to a SIP's purpose of attaining and maintaining the NAAQS.
On November 24, 1993, EPA published a final rule establishing criteria
and procedures for determining if transportation plans, programs and
projects funded or approved under Title 23 United States Code or the
Federal Transit Act conform to the SIP. EPA revised the Transportation
Conformity Rule on August 7, 1995 (60 FR 40098), November 14, 1995 (60
FR 57179), and August 15, 1997 (62 FR 43780), and codified the
revisions under 40 CFR part 51, subpart T and 40 CFR part 93, subpart
A--Conformity to State or Federal Implementation Plans of
Transportation Plans, Programs, and Projects Developed, Funded or
Approved Under Title 23 United States Code or the Federal Transit Laws
(62 FR 43780). The transportation conformity rules require the
comparison of an ozone nonattainment area to the actual projected
emissions from cars, trucks and buses on the highway network, to the
MVEB established by the SIP. The Northwest Indiana area has an approved
attainment demonstration. EPA's approval of the attainment
demonstration on November 13, 2001, (66 FR 56944) established interim
MVEBs for transportation conformity purposes. These SIP revisions
revise the MVEBs and reestablish the MVEBs for transportation
conformity purposes.
VI. What Is a MVEB?
A MVEB is the projected level of controlled emissions from the
transportation sector (mobile sources) that is estimated in the SIP.
The SIP controls emissions through regulations, for example, on fuels
and exhaust levels for cars. The MVEB concept is further explained in
the preamble to the November 24, 1993, transportation conformity rule
(58 FR 62188). The preamble also describes how to establish the MVEB in
the SIP and revise the MVEB. The transportation conformity rule allows
the MVEB to be changed as long as the total level of emissions from all
sources remains below the attainment level of emissions.
VII. How Does This Action Change Implementation of Transportation
Conformity for the Northwest Indiana Area?
In today's action, EPA is approving revisions to the 2005 and 2007
MVEBs for the Indiana portion of the Chicago 1-hour ozone nonattainment
area. The revised 2005 MVEB for the Northwest Indiana area is 15.18 tpd
for VOC. The revised 2007 MVEBs for the Lake and Porter County area are
12.37 tpd for VOC and 63.33 tpd for NOX.
As a result of these findings, the Northwest Indiana area must use
the revised 2005 and 2007 MVEBs for future conformity determinations
effective on the date of this action. EPA's approval of the MVEBs
removes the administrative freeze on transportation conformity on the
area and allows the area to demonstrate conformity.
VIII. What Is the Action?
EPA is approving Indiana's SIP revisions because they meet all of
the requirements of section 110 of the Clean Air Act, as interpreted by
EPA policy and guidance. Additionally, these SIP revisions meet the
applicable requirements of the Transportation Conformity Rule.
[[Page 52431]]
IX. Did Indiana Hold a Public Hearing?
Indiana held a public hearing on July 28, 2004 in Merrillville,
Indiana. The public comment period extended until July 30, 2004. No
comments were received during the comment period including at the
public hearing.
X. Statutory and Executive Order Reviews
Under Executive Order 12866 (58 FR 51735, October 4, 1993), this
action is not a ``significant regulatory action'' and therefore is not
subject to review by the Office of Management and Budget.
Executive Order 13211: Actions Concerning Regulations That
Significantly Affect Energy Supply, Distribution, or Use
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).
Regulatory Flexibility Act
This action merely approves state law as meeting Federal
requirements and imposes no additional requirements beyond those
imposed by state law. Accordingly, the Administrator certifies that
this 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.).
Unfunded Mandates Reform Act
Because this rule approves 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 (Pub. L. 104-4).
Executive Order 13175: Consultation and Coordination With Indian Tribal
Governments
This 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
(65 FR 67249, November 9, 2000).
Executive Order 13132: Federalism
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 approves a state rule implementing a
Federal standard, and does not alter the relationship or the
distribution of power and responsibilities established in the Clean Air
Act.
Executive Order 13045: Protection of Children From Environmental Health
and Safety Risks
This 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.
National Technology Transfer Advancement Act
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.
Paperwork Reduction Act
This 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.).
Congressional Review Act
The Congressional Review Act, 5 U.S.C. 801 et seq., as added by the
Small Business Regulatory Enforcement Fairness Act of 1996, generally
provides that before a rule may take effect, the agency promulgating
the rule must submit a rule report, which includes a copy of the rule,
to each House of the Congress and to the Comptroller General of the
United States. EPA will submit a report containing this rule and other
required information to the U.S. Senate, the U.S. House of
Representatives, and the Comptroller General of the United States prior
to publication of the rule in the Federal Register. A major rule cannot
take effect until 60 days after it is published in the Federal
Register. This action is not a ``major rule'' as defined by 5 U.S.C. 804(2).
Under section 307(b)(1) of the Clean Air Act, petitions for
judicial review of this action must be filed in the United States Court
of Appeals for the appropriate circuit by October 25, 2004. Filing a
petition for reconsideration by the Administrator of this final rule
does not affect the finality of this rule for the purposes of judicial
review nor does it extend the time within which a petition for judicial
review may be filed, and shall not postpone the effectiveness of such
rule or action. This action may not be challenged later in proceedings
to enforce its requirements. (See section 307(b)(2).)
List of Subjects in 40 CFR Part 52
Environmental protection, Air pollution control, Intergovernmental
relations, Nitrogen dioxide, Volatile organic compounds, Ozone.
Dated: August 12, 2004.
Steve Rothblatt,
Acting Regional Administrator, Region 5.
? Part 52, chapter I, title 40 of the Code of Federal Regulations is
amended as follows:
PART 52--[AMENDED]
? 1. The authority citation for part 52 continues to read as follows:
Authority: 42 U.S.C. 7401 et seq.
Subpart P--Indiana
? 2. Section 52.777 is amended by adding paragraph (aa) to read as follows:
Sec. 52.777 Control strategy: photochemical oxidants (hydrocarbons).
* * * * *
(aa) Approval--On August 6, 2004, Indiana submitted a revision to
the 1-hour ozone attainment plan for Lake and Porter Counties. The
revision consists of new motor vehicle emission estimates and new
MOBILE6 based motor vehicle emissions budgets. The motor vehicle
emissions budget for volatile organic compounds (VOCs) for Lake and
Porter Counties, Indiana for the 2005 interim Rate of Progress year is
now 15.18 tons per summer day (tpd). The 2007 motor vehicle emissions
budgets for the Lake and Porter Counties, Indiana are now 12.37 tpd VOC
and 63.33 tpd oxides of nitrogen.
[FR Doc. 04-19434 Filed 8-25-04; 8:45 am]
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