[Federal Register Volume 77, Number 20 (Tuesday, January 31, 2012)]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2012-2026]
ENVIRONMENTAL PROTECTION AGENCY
Conference on Air Quality Modeling
AGENCY: U.S. Environmental Protection Agency (EPA).
ACTION: Notice of conference.
SUMMARY: The EPA will be hosting the Tenth Conference on Air Quality
Modeling on March 13-15, 2012. Section 320 of the Clean Air Act (CAA)
requires a conference to be held every 3 years. The purpose of the
conference is to provide an overview of the latest features of the
agency's preferred air quality models and to provide a forum for public
review and comment on how the agency determines and applies air quality
models in the future.
DATES: Comments: Comments on how the agency determines and applies air
quality models must be received on or before April 16, 2012.
Conference: The conference will be held on March 13 through 15,
2012, from 8:30 a.m. to 5:00 p.m. Requests to speak at the conference
should be submitted to the individual listed below by March 5, 2012.
ADDRESSES: Comments: Submit your comments, identified by Docket ID No.
EPA-HQ-OAR-2012-0056 by one of the following methods:
http://www.regulations.gov: Follow the on-line
instructions for submitting comments. This is the EPA's preferred
method for receiving comments.
Email: Comments may be sent by electronic mail (email) to
[email protected], Attention Docket ID No. EPA-HQ-OAR-2012-0056.
Fax: Fax your comments to (202) 566-9744, Attention Docket
ID No. EPA-HQ-OAR-2012-0056.
Mail: Send your comments to: Air and Radiation Docket and
Information Center, Environmental Protection Agency, Mailcode: 2822T,
1200 Pennsylvania Ave. NW., Washington, DC 20460, Attention Docket ID
Hand Delivery or Courier: Deliver your comments to EPA
Docket Center, 1301 Constitution Ave. NW., Room 3334, Washington, DC.
Such deliveries are only accepted during the Docket's normal hours of
operation, and special arrangements should be made for deliveries of
Instructions: Direct your comments to Docket ID No. EPA-HQ-OAR-
2012-0056. The EPA's policy is that all comments received will be
included in the public docket without change and may be made available
online at http://www.regulations.gov, 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 http://www.regulations.gov or email. The http://www.regulations.gov Web site
is an ``anonymous access'' system, which means the EPA will not know
your identity or contact information unless you provide it in the body
of your comment. If you send an email comment directly to the EPA
without going through http://www.regulations.gov, your email 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, the 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 the EPA cannot read your comment
due to technical difficulties and cannot contact you for clarification,
the 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 information about the
EPA's public docket, visit the EPA Docket Center homepage at http://www.epa.gov/epahome/dockets.htm.
Docket: All documents in the docket are listed in the http://www.regulations.gov index. Although listed in the index, some
information is not publicly available, e.g., CBI or other information
whose disclosure is restricted by statute. Certain other material, such
as copyrighted material, will be publicly available only in hard copy
form. Publicly available docket materials are available either
electronically in http://www.regulations.gov or in hard copy at the Air
Docket in the EPA Docket Center, EPA West, Room 3334, 1301 Constitution
Ave. NW., Washington,
DC. This docket facility is open from 8:30 a.m. to 4:30 p.m., Monday
through Friday, excluding legal holidays. The Docket telephone number
is (202) 566-1742; fax (202) 566-9744.
Background Information: Additional information and a more detailed
agenda are electronically available at http://www.epa.gov/ttn/scram/10thmodconf.htm.
Conference: The conference will be held in the EPA Auditorium, Room
C111, 109 T.W. Alexander Drive, Research Triangle Park, NC 27711.
FOR FURTHER INFORMATION CONTACT: George Bridgers, U.S. Environmental
Protection Agency, Office of Air Quality Planning and Standards, Air
Quality Assessment Division, Mail Code C439-01, Research Triangle Park,
NC 27711; telephone: (919) 541-5563; fax: (919) 541-0044; email
address: [email protected].
I. General Information
A. What should I consider as I prepare my comments for the EPA?
1. Submitting CBI. Do not submit this information to the EPA
through www.regulations.gov or email. Clearly mark the part or all of
the information that you claim to be CBI. For CBI information in a disk
or CD ROM that you mail to the EPA, mark the outside of the disk or CD
ROM as CBI and then identify electronically within the disk or CD ROM
the specific information that is claimed as CBI. In addition to one
complete version of the comment that includes information claimed as
CBI, a copy of the comment that does not contain the information
claimed as CBI must be submitted for inclusion in the public docket.
Information so marked will not be disclosed except in accordance with
procedures set forth in 40 CFR part 2.
2. Tips for Preparing Your Comments. When submitting comments,
Identify the rulemaking by docket number and other
identifying information (subject heading, Federal Register date and
Follow directions. The agency may ask you to respond to
specific questions or organize comments by referencing a Code of
Federal Regulations (CFR) part or section number.
Explain why you agree or disagree; suggest alternatives
and substitute language for your requested changes.
Describe any assumptions and provide any technical
information and/or data that you used.
If you estimate potential costs or burdens, explain how
you arrived at your estimate in sufficient detail to allow for it to be
Provide specific examples to illustrate your concerns, and
Explain your views as clearly as possible, avoiding the
use of profanity or personal threats.
Make sure to submit your comments by the comment period
The Guideline on Air Quality Models (hereafter, called the
Guideline, which is found in Appendix W to 40 CFR part 51), is used by
the EPA, states and industry to prepare and review new source permits,
source permit modifications, and State Implementation Plan submittals
and revisions. The Guideline serves as a means by which national
consistency is maintained in air quality analyses. We originally
published the Guideline in April 1978, and it was incorporated by
reference in the regulations for the Prevention of Significant
Deterioration of Air Quality in June 1978. We revised the Guideline in
1986, and updated it with supplement A in 1987, supplement B in July
1993, and supplement C in August 1995. We published the Guideline as
Appendix W to 40 CFR part 51 when we issued supplement B. We
republished the Guideline in August 1996 (61 FR 41838) to adopt the CFR
system for labeling paragraphs.
To support the process of developing and revising the Guideline
during the period 1977-1988, we held the First, Second, and Third
Conferences on Air Quality Modeling as required by CAA Section 320 to
help standardize modeling procedures. These modeling conferences
provided us with comments on the Guideline and associated revisions,
thereby helping us introduce improved modeling techniques into the
In October 1988, we held the Fourth Conference on Air Quality
Modeling to advise the public on new modeling techniques and to solicit
comments to guide our consideration of any rulemaking needed to further
revise the Guideline. We held the Fifth Conference in March 1991, which
served as a public hearing for the proposed revisions to the Guideline.
In August 1995, we held the Sixth Conference as a forum to update our
available modeling tools with state-of-the-science techniques and for
the public to offer new ideas. The Seventh Conference was held in June
2000 and served as a public hearing for the proposed changes to the
recommended air quality models in Appendix W including the CALPUFF
modeling system, AERMOD modeling system, and ISC-PRIME model. We held
the Eighth Conference on Air Quality Modeling in September 2005, which
provided details on changes to these recommended air quality models,
including the Notice of Data Availability published in September 2003
related to the incorporation of the PRIME downwash algorithm in the
AERMOD dispersion model in response to comments received from the
Seventh Conference, and details on available methods for model
performance evaluation. Additionally, at the Eighth Conference, there
was a panel of experts discussion on the use of state-of-the-science
prognostic meteorological data for informing the dispersion models.
The most recent conference was the Ninth Conference on Air Quality
Modeling held in October 2008. The conference began with an overview
presentation and review of Appendix W and plans to reinstitute the
Model Clearinghouse. Several presentations were made on non-guideline
applications of dispersion models as well as a continuation of
discussions from the Eighth Conference on the use of prognostic
meteorological data with respect to informing the Appendix W models.
Updates were provided on the regulatory status, recent coding changes,
and future development of the AERMOD modeling system, the EPA's
preferred model for near-field regulatory applications, and the CALPUFF
modeling system, the EPA's preferred model for long-range transport of
criteria pollutants and their impacts on Federal Class I areas. The
Ninth Conference concluded with a collection of presentations reviewing
the available model evaluation methods and reviewing new and emerging
models and techniques for future consideration under Appendix W. The
proceedings, including supporting material and public comments
received, are found in Docket No. EPA-HQ-OAR-2008-0604.
III. Public Participation
The Tenth Conference on Air Quality Modeling will be open to the
public; no admission fee is charged and there is no formal
registration. The conference will begin the first morning with
introductory remarks by the presiding EPA official. The following
topics will be presented:
A. Appendix W overview;
B. Model Clearinghouse update;
C. Currently preferred air quality models (AERMOD and CALPUFF)
status and updates;
D. Review of prognostic meteorological data processing tool for
dispersion models, MMIF;
E. Modeling for compliance demonstration of the PM2.5
National Ambient Air Quality Standards (NAAQS) including discussion of
the draft PM2.5 (primary and secondary) modeling guidance;
F. Modeling for compliance demonstration of the 1-hour
NO2 and SO2 NAAQS including presentations from
the AERMOD Implementation Workgroup NO2 and SO2
G. Review of new and emerging models/techniques for future
consideration under Appendix W to address long-range transport and
H. Other presentations by the public.
Those wishing to speak at the conference, whether to volunteer a
presentation on a special topic or to offer general comment on any of
the modeling techniques scheduled for presentation, should contact the
EPA at the address given in the FOR FURTHER INFORMATION CONTACT section
(note the cutoff date). Such persons should identify the organization
(if any) on whose behalf they are speaking and the length of the
presentation. If a presentation of general comments is projected to be
longer than 10 minutes, the presenter should also state why a longer
period is needed. Persons failing to submit a written notice but
desiring to speak at the conference should notify the presiding officer
immediately before the conference, and they will be scheduled on a
The conference will be conducted informally and chaired by an EPA
official. There will be no sworn testimony or cross examination. A
verbatim transcript of the conference proceedings will be produced and
placed in the docket. Speakers should bring extra copies of their
presentation for inclusion in the docket and for the convenience of the
recorder. Speakers will also be permitted to enter written comments
into the record. Additional written statements or comments should be
sent to the OAR Regulatory Docket (see ADDRESSES section). A transcript
of the proceedings and a copy of all written comments will be
maintained in Docket ID No. EPA-HQ-OAR-2012-0056, which will remain
open until April 16, 2012, for the purpose of receiving additional
Dated: January 25, 2012.
Mary E. Henigin,
Acting Director, Office of Air Quality Planning and Standards.
[FR Doc. 2012-2026 Filed 1-30-12; 8:45 am]
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