United States
Environmental Protection
Agency
Office of Air Quality
Planning and Standards
Research Triangle Park, NC 27711
EPA-454/R-92-001
May 1992
EPA
INTERAGENCY WORKGROUP ON
AIR QUALITY MODELING (IWAQM)
WORK PLAN RATIONALE
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EPA-454/R-92-001
INTERAGENCY WORKGROUP ON
AIR QUALITY MODELING (IWAQM)
WORK PLAN RATIONALE
U.S. Environmental Protection Agency
Region 5, Library (PL-12J)
77 West Jackson Boulevard, 12th Floor
Chicago, !L 60604-3590
Office of Air Quality Planning and Standards
Technical Support Division (MD-14)
Research Triangle Park, North Carolina 27711
May 1992
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NOTICE
The information in this document has been reviewed in its
entirety by the U.S. Environmental Protection Agency (EPA), and
approved for publication as an EPA document. Mention of trade
names, products, or services does not convey, and should not be
interpreted as conveying official EPA approval, endorsement, or
recommendation.
ii
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PREFACE
The Interagency Workgroup on Air Quality Modeling (IWAQM)
was formed to provide a focus for development of technically
sound regional air quality models for regulatory assessments of
pollutant source impacts on Federal class I areas. Meetings were
held with personnel from interested Federal agencies, viz. the
Environmental Protection Agency, the U.S. Forest Service, the
National Park Service and the Fish and Wildlife Service. The
purpose was to review respective regional modeling programs, to
develop an organizational framework, and to formulate reasonable
objectives and plans that could be presented to management for
support and commitment. The members prepared a memorandum of
understanding (MOU) that incorporated the goals and objectives of
the workgroup and obtained signatures of management officials in
each participating Agency. Although no States are signatories,
their participation in IWAQM functions is explicitly noted in the
MOU.
This Status Report and Work Plan Rationale is the first
document published by IWAQM in an effort to inform the sponsoring
Agencies and other interested parties about IWAQM activities.
IWAQM members anticipate issuing additional publications related
to the Workgroup's further plans, progress toward meeting goals
and objectives, the results of model evaluation studies, proposed
and final recommendations on modeling systems for regulatory
applications, and other topics related to specific objectives in
the MOU.
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ACKNOWLEDGEMENTS
The members of IWAQM acknowledge the special efforts of the
Chairman, Mark Scruggs of the National Park Service, for adroitly
managing the preparation of this document, John Viroont of the
National Park Service for composing the contents and John Irwin
of the Environmental Protection Agency for developing the Work
Plans and implementing the program for funding them.
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CONTENTS
PREFACE iii
ACKNOWLEDGEMENTS iv
FIGURES Vi
I. BACKGROUND 1
II. OBJECTIVES 1
III. APPROACH , 1
IV. MEASURES 2
V. MODEL ATTRIBUTES 3
VI. CANDIDATE MODELS 4
VII. CURRENT STATUS 4
VIII. RECOMMENDED ACTIONS 4
IX. REFERENCES ' H
APPENDIX A. MEMORANDUM OF UNDERSTANDING 12
APPENDIX B. LISTING OF WORKGROUP MEMBERS 16
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FIGURES
Number Page
1 WORK PLAN - PHASE 1, 1992 5
2 PROJECT TIMELINE - PHASE 1 5
3 WORK PLAN - PHASE 2 8
4 PROJECT TIMELINE - PHASE 2 9
5 PROJECT TIMELINE - PHASE 2 (CONT.) 10
Vi
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I. BACKGROUND
The United States Environmental Protection Agency (EPA), the
United States Forest Service (USFS), the United States Fish and
Wildlife Service (FWS), and the National Park Service (NPS) have
entered into a memorandum of understanding (MOU) to cooperate in
the developing, testing, and applying of air quality
dispersion/simulation models (Appendix A). These models are
needed to estimate pollutant concentrations on a regional scale,
including the individual and cumulative impacts of proposed and
existing sources on Air Quality Related Values (AQRVs),
Prevention of Significant Deterioration (PSD) increments, and
National Ambient Air Quality Standards (NAAQS), with emphasis on
Federal class I areas. To carry out this agreement a working
group has been formed, known as the Interagency Workgroup for Air
Quality Modeling (IWAQM). A list of workgroup members is given
in Appendix B.
Coincidentally, Congress recognized the need to support the
development of such a modeling capability. A special
appropriation bill sponsored by Representative Tom Bliley of
Virginia granted EPA $700,000 (for fiscal year 1992) for
"identifying and evaluating sources of visibility impairment in
class I areas." The work plan described herein has been tailored
to be consistent with, and responsive to, this special
appropriation.
II. OBJECTIVES
The objective of IWAQM is to review existing modeling
techniques to recommend a credible, regional scale model capable
of providing the necessary information to assess AQRVs in class I
areas as well as attainment of the NAAQS and regional scale PSD
increment consumption. It is desired that the computer resources
needed to access the recommended modeling system for most
applications be comparable to resources typically available to
State and local air pollution control agencies. This promotes
(but does not limit) the computer requirements to those of a
Reduced Instruction Set Computer (RISC) architecture work station
or a high-end personal computer.
III. APPROACH
Following several meetings and deliberations the IWAQM
intends to implement a phased approach in order to satisfy the
modeling needs described above. Phase 1 consists of reviewing
EPA guidance and recommending a modeling approach to meet the
immediate need for a regional scale model for ongoing permitting
activity. This recommendation will likely be based on current
EPA guidance and existing empirical models. During Phase 2 the
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workgroup will augment Phase 1 with a review of other available
models and make a recommendation of the most appropriate modeling
techniques. This recommendation will likely represent a
compromise between the current modeling state-of-science and best
available operational computer capabilities. The IWAQM
recognizes this later recommendation may change the initial,
first phase, interim recommendation. In Phase 3 the workgroup
will add more advanced modeling techniques to its consideration
and recommend a more permanent solution, probably representing a
greater level of scientific and computer hardware sophistication.
During Phase 1 and 2, improvements to existing modeling
systems will likely be identified. The products of Phase 2 and 3
are anticipated to be models which have been thoroughly tested
and appraised. The final Phase (3) will consider the long-term,
optimum modeling needs.
In order to focus this effort, increase the chance for
success in at least certain scenarios, and to meet an articulated
immediate need of permitting authorities, and the EPA, IWAQM will
address only sulfur and nitrogen derived pollutants in the
immediate future. We acknowledge that there are other pollutants
such as photochemical oxidants that may injure components of the
natural ecosystem, but assessment by IWAQM of the modeling needs
and development of oxidant effects modules is postponed until a
later date.
IV. MEASURES
Based on the information available to the IWAQM, the
committee has compiled a preliminary list of measures that AQRV
models must be able to address to be useful for the Federal Land
Managers (FLMs) in their deliberations of the impact on federal
lands. These measures are somewhat different for each component
of the natural ecosystem and include estimates for the
concentration of a variety of chemical species, pollutant
exposure, pollutant deposition, and total pollutant loading for a
variety of averaging times and units. The specific list of
measures for assessing effects on visibility, aquatic, and
terrestrial ecosystems is indicated below.
Visibility
The modeling system must be capable of assessing visibility
effects of coherent plumes and regional haze from sulfur-based
and nitrogen-based air pollutants, organics, elemental carbon,
soil, and process derived fugitive emissions. It is important
that the modeling system be able to simulate averaging periods as
short as 1-hour. At a minimum, the system must be capable of
producing concentrations of particles, SO^, NO^, and NO,. The
modeling system must account for the oxidation mechanisms in the
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formation of SO^ and NOj. The system must account for both the
gaseous and aqueous phase oxidation pathways for SOT. Relative
humidity fields must be included for visibility analysis. In
addition to the atmospheric transport and dispersion model
results, data must be available regarding the vertical profiles
of relative humidity and temperature as a function of time of
day, season and location. These are required for a visibility
effect calculation in a post-processor or independent visibility
effects module.
Aquatic Ecosystems
The modeling system must provide information needed to
assess the ecological effects of deposited pollutants onto water
surfaces .and through hydrologic processes, such as lake and
stream acidification, for monthly, seasonal, and annual periods.
The modeling system must be capable of calculating both dry and
wet deposition of SO£ and NO^, which necessitates precipitation
calculations. The atmospheric model needs to generate the
parameters necessary to run independent hydrologic and chemical
assessment models and to estimate the amount of deposition of
toxic chemicals.
Terrestrial Ecosystems
The modeling system must provide information needed to
evaluate the terrestrial effects, such as tissue damage or
mortality or decreases in growth, of atmospheric pollutants from
toxics, sulfur dioxide, sulfuric acid mist, herbicides, and
pesticides for averaging times ranging from 1-hour to several
years. The atmospheric model should characterize the pollutant
contribution to the ecosystem in terms of deposition, total
loading, and ambient concentration.
V. MODEL ATTRIBUTES
The models thus far considered by IWAQM are on both Eulerian
and Lagrangian frameworks and meet the following criteria:
A. Use spatially and temporally varying meteorological
fields to include, precipitation, wind, and
temperature.
B. Include at least first order sulfur and nitrogen
oxidation chemistry.
C. Include treatment for effects of complex terrain on the
meteorological fields in consideration of land use and
on the transport and dispersion.
D. Treat extended periods of regional stagnation.
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E. Couple pollutant transport, dispersion, and deposition
with meteorological fields.
F. Include cloud and aqueous phase chemistry which allows
the calculation of chemical transformation and direct
cloud impacts on terrain.
G. Account for the effects of aerosol/particle size
distribution on radiative transfer processes.
H. Include treatment of wet and dry deposition processes.
I. Include a modeling domain of North America (RADM-
boundary) for purposes of establishing boundary
conditions. The specific model domain is capable of
being specified on a case-by-case basis.
The IWAQM may identify other desirable qualities of the
modeling system in the course of its review. The models
identified do not necessarily need to meet all of the
aforementioned criteria initially, but should be structured such
that they can be easily modified to meet these criteria.
VI. CANDIDATE MODELS
To initiate Phase 1 evaluations, IWAQM identified a
preliminary list of existing regional scale models which
currently meet, or with minor modifications, will satisfy the
criteria identified above. All of these models empirically
determine the meteorological fields to which a dispersion model
is applied. As such, they represent models that rank, in level
of sophistication and operational complexity, somewhere between
traditional single-source Gaussian and first-principle models.
These models are:
ARM3 (Morris et al., 1988)
MESOPUFF-II (Scire et al. , 1984)
CALMET/CALPUFF (Scire et al., 1990a,b)
NUATMOS/CITPUFF (ROSS et al., 1988)
VII. CURRENT STATUS
Results of preliminary sensitivity tests with ARM3 and
MESOPUFF-II suggest that an unqualified application of those
models to an arbitrary scenario may be unadvisable. These tests
call to question the ability of these models to generate
physically reasonable meteorological fields (particularly mixing
height). In part, the questionable results occur because the
models must attempt to generate meteorological fields from
observations that are significantly separated in space and time.
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VIII. RECOMMENDED ACTIONS
Phase 1
As shown in Figures 1 and 2, the Work Plan and timeline
for Phase 1, the NPS will continue to conduct sensitivity
analyses of ARM3 and MESOPUFF-II, to determine which of these
FIGURE 1. WORK PLAN - PHASE 1, 1992
1A. SENSITIVITY ANALYSES OF
MESOPUFF-II, ARM3 (EXAMINATION OF
GENERATED METEOROLOGICAL AND
CONCENTRATION FIELDS).
2A. VISIBILITY MODULE (FIRST ORDER
APPROXIMATION) .
IB. EXAMINATION OF THE COUPLING OF 1A AND 2A.
1C. DOCUMENT RECOMMENDED APPROACH. |
FIGURE 2. PROJECT TIMELINE - PHASE 1
1992
MONTH
1
2
3
4
5
6
7
8
TASK 1
UU ' ' ' :
siais.it ma* ;
ftMUKSXS '"-'''••
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RECOMHSNOBD
APPROACH ' :
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TASK 2
2JW
vistsitiTSr
MODULE
models will best meet the immediate needs of State and permitting
authorities. The NPS will also document a simple visibility
module that relates the change in atmospheric extinction with
model-estimated sulfate and nitrate concentrations and couple
this module with the meteorological and dispersion model
recommended during this phase.
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Phase 2
The IWAQM has discussed the relative merits of various
empirical modeling approaches for producing four dimensional
meteorological fields. From the discussions, a number of serious
disadvantages to empirical approaches have been identified. The
disadvantages of empirical approaches could be resolved using a
model, based on the primitive equations of motion of the
atmosphere. The disadvantage to this, however, is that such
models typically require technical staff with a high degree of
expertise in this area and extensive computer resources. This
latter requirement has been drastically eased with the rapid
advent of new computer technologies. The need for highly
specialized staff, however, does not meet one of the essential
needs identified by IWAQM, namely, a system that can be
implemented by an individual State with limited resources.
During its discussions, IWAQM has identified a possibly
viable alternative. A primitive equation meteorological model
with four dimensional data assimilation, MM4-FDDA, has been
successfully run for a number of cases under the NAPAP program
(Stauffer and Seaman, 1990 and Stauffer et al., 1991). This
model is available to the EPA Office of Research and Development
(ORD) . The system has previously been run with an 80 kilometer
resolution. We suggest that the 80 kilometer resolution
meteorological fields, generated on an hourly basis by the MM4-
FDDA system, be used as the base input to the various meso-scale
modeling systems being examined by the IWAQM. These fields would
eventually be generated by ORD for the continental United States
for an entire year, but first, the viability of this approach
would be demonstrated with a smaller data set.
Ultimately the desire is to use all of the meteorological
fields generated by the primitive equation model as direct input
to the air quality model(s) chosen by the IWAQM. The IWAQM
recommends an interim approach using these meteorological fields
to generate "soundings" every 80 kilometers and then using these
as input to the various meteorological drivers of the chosen air
quality models.
Phase 2 has been prepared to implement this proposed
alternative solution. The Work Plan and timeline is shown in
Figures 3, 4 and 5. We anticipate that the plan can be
implemented with the funds from the special appropriation (for
EPA, USFS, and NFS contractor support) with some supplemental NFS
project funds in 1992 and 1993, and in-kind services from the
EPA, NPS, and USFS. Briefly the plan calls for:
The NPS to proceed with the modification of the NPSAQMS and
MESOPUFF-II so that these models can use the meteorological
fields prepared by MM4-FDDA, conduct sensitivity analyses
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with MM4-FDDA data, and document model adaptations and
sensitivity test results.
The USFS to proceed with modification of the CITPUFF/NUATMOS
so that these models can similarly use the MM4-FDDA meteoro-
logical data, conduct sensitivity analyses, and document
model adaptations and results of sensitivity test results.
EPA ORD to generate and provide access to gridded MM4-FDDA
meteorological data.
EPA OAQPS to hire a contractor to conduct a similar
assessment of the CALPUFF model and conduct an assessment of
the performance of all the models on the preliminary list
given above.
EPA to provide a special tracer data base on which to
conduct additional model sensitivity analyses.
- The EPA and NPS to retain a contractor to develop and
document a visibility module (representing a substantial
upgrade of the module proposed in Phase 1) to add to the
complete IWAQM modeling package.
The EPA to retain a contractor to update the visibility
workbook to improve VISCREEN parameter interpretations, to
correct any errors in the PLUVUE II code, and clarify the
discussion on the application and interpretation of PLUVUE
II.
IWAQM will use the information thus generated to make a
recommendation as to the most appropriate modeling technique(s)
for use in assessing AQRVs in class I areas as well as regional
scale PSD increment consumption.
The final, major activity in Phase 2 (II) is the regulatory
proposal of the recommended modeling technique(s) for use in
assessing the impact on AQRVs, PSD regional increment consumption
and the NAAQS in class I areas. This is anticipated to involve
publishing a notice in the Federal Register and soliciting public
comments on proposed revisions to the Guideline on Air Quality
Models. There will be a public hearing/meeting, review of public
comments, preparation of responses and final rulemaking. IWAQM
will also arrange for training on the recommended system as well
as publication of the user's manuals and related regulatory
guidance.
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FIGURE 3. WORK PLAN - PHASE 2
1A. INDIVIDUAL ANALYSES
OF METEOROLOGICAL
PROCESSORS
- (NFS XNHOUSE)
- (USFS/EPA
CONTRACTOR)
- (EPA CONTRACTOR)
2A. SENSITIVITY
METEOROLOGICAL DATA
(USE EXISTING DATA)
3A. VISCREEN UPDATE
- (EPA CONTRACTOR)
IB. COMPARISON/SUMMARY
OF SENSITIVITY ANALYSES
OF METEOROLOGICAL
PROCESSORS
- (EPA CONTRACTOR)
2B. RETRIEVAL/DATA
MANAGEMENT SYSTEM
3B. STATE-OF-PRACTICE
VISIBILITY MODULE
- (NFS CONTRACTOR)
- (EPA CONTRACTOR)
1C. IWAQM EVALUATION OF
SENSITIVITY ANALYSES OF
METEOROLOGICAL
PROCESSORS
2C. CONSTRUCT MM4-
FDDA DATA ARCHIVE
(NEW GENERATION)
- (EPA CONTRACTOR)
ID. INDIVIDUAL ANALYSES
OF DISPERSION MODELS
(COMMON METEOROLOGICAL
PROCESSOR)
- (NFS INHOUSE)
- (USPS/EPA
CONTRACTOR)
- (EPA CONTRACTOR)
2D. EVALUATION MM4-
FDDA DATA SET
(SPECIAL EVALUATION
DATA)
- (EPA CONTRACTOR)
IE. COMPARISON/SUMMARY
OF SENSITIVITY ANALYSES
OF DISPERSION MODELS
- (EPA CONTRACTOR)
IF. IWAQM EVALUATION OF
SENSITIVITY ANALYSES OF
DISPERSION MODELS
1G. EVALUATION OF PHASE
1 AND 2 MODEL SYSTEMS
- (EPA CONTRACTOR)
1H. IWAQM SUMMARY
RECOMMENDATIONS
II. REGULATORY REVIEW
AND DISSEMINATION
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FIGURE 4. PROJECT TIMELINE - PHASE 2
1992
MONTH
TASK 1
TASK 2
TASK 3
10
11
12
3A.
HETEOROLOGIGAL
2B..
at '
METEOROUX3ICAL
PROCESSORS ?
3B.
Phase 3
It is premature to scope out future IWAQM activities in
detail. We anticipate that IWAQM will continue to conduct
sensitivity analyses and evaluation of models in Phase 2,
consider other modeling alternatives, and investigate the
feasibility of adding modules for estimating terrestrial and
aquatic ecosystems effects. As progress is made, IWAQM will
periodically report on its findings and recommendations for
future activities.
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FIGURE 5. PROJECT TIMELINE - PHASE 2 (CONT.)
1993/
1994
MONTH
TASK 1
TASK 2
TASK 3
IB, 1WAQK SUHMMHf
09 DISPERSION
MODEL SENSITIVITY
RESULTS - """,.
2A. AND 2B.
iCQNTIMUED FROM
1S92
IF, IWAQM
BVM#«TIO»?
0ISPKRSION
OF 1-Y8AR
DATABASE USJUG
lffl4~FDDA
ccanswocsoar
AVAILABLE DATA;
VISIBILITY MODULE
FROW
2D,
OF ffii4~FDDA
DATA SET
3B.
.CONTINOED
FROM 1992
10
11
12
(FBOM
2|
?OR USER,
o? TIKAI, PHAS® 2
DISSEMINATION
10
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IX. REFERENCES
Morris, R.E., Kessler, R.C., Douglas, S.G., Styles, K.R., and
Moore, G.E., (1988): Rocky Mountain Acid Deposition
Model Assessment: Acid Rain Mountain Mesoscale Model
(ARM3). EPA-600/3-88/042, NTIS PB89-124408,
Environmental Protection Agency, Research Triangle
Park, NC, 318 pp.
Ross, D.G., Smith, I.N., Manins, P.C., and Fox, D.G., (1988):
Diagnostic wind field modeling for complex terrain:
model development and testing. J. Appl. Meteor.,
27(7):785-796.
Scire, J.S., Insley, and Yamartino, R.J., (1990a): Model
Formulation and User's Guide for the CALMET Dispersion
Model. California Air Resources Board, Sacramento, CA,
278 pp.
Scire, J.S., Strimaitis, D.G., and Yarmartino, R.J., (1990b):
Model Formulation and User's Guide for the CALPUFF
Dispersion Model. California Air Resources Board,
Sacramento, CA, 344 pp.
Scire, J.S., Lurmann, F.W., Bass, A., and Hanna, S.R., (1984):
User's Guide to the Mesopuff II Model and Related
Processor Programs. EPA-600/8-84-013. NTIS PB84-
181775. Environmental Protection Agency, Research
Triangle Park, NC, 214 pp.
Stauffer, D.R. and Seaman, N.L., (1990): Use of four-
dimensional data assimilation in a limited-area
mesoscale model. Part I: Experiments with synoptic-
scale data. Mon. Wea. Rev., (118):1250-1277.
Stauffer, D.R., Seaman, N.L. and Binkowski, F.S., (1991): Use
of four-dimensional data assimilation in a limited-area
mesoscale model. Part II: Effect of data assimilation
within the planetary boundary layer. Mon. Wea. Rev.,
(119):734-754.
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APPENDIX A
NPS AGREEMENT NO. 1443-MU-001-92-002
MEMORANDUM OF UNDERSTANDING
AMONG THE
U.S. ENVIRONMENTAL PROTECTION AGENCY
U.S. FOREST SERVICE
U.S. FISH AND WILDLIFE SERVICE
AND THE
NATIONAL PARK SERVICE
Article I. This agreement is entered into to foster cooperation among the
United States Environmental Protection Agency (EPA), the United
States Forest Service (USFS), the United States Fish and
Wildlife Service (FWS) and the National Park Service (NPS) in
developing, testing, "and applying air quality
dispersion/simulation models. This agreement is pursuant to
Section 320 of the Clean Air Act (42 U.S.C. 7620) and Sections
901(b) and 816 of the Clean Air Act Amendments of 1990, which
respectively amend and add Section 103(e)(3) and Section
169B(a)(l)(C) to the Clean Air Act (42 U.S.C. 7403(e)(3) and
7492). Specifically, the agreement relates to the development,
evaluation, and application of mathematical modeling techniques
that can be used to estimate pollutant concentrations on a
regional scale, including the individual and cumulative impacts
of proposed and existing sources on air quality related values
(AQRVs), PSD increments, and National Ambient Air Quality
Standards (NAAQS), with emphasis on Federal class I areas. The
output from such models is needed by Federal Land Managers, and
others, to make informed decisions regarding the protection of
natural resources.
Article II. Advanced air quality simulation modeling techniques that can
assess the regional impacts from air pollutant emissions have
historically not been readily available or frequently applied.
To date, the EPA, USFS, and NPS have independently explored,
with limited success, the adequacy of various computer-assisted
approaches. However, in order to ensure the development,
acceptance, and application of a consistent air quality
simulation modeling approach to our common air quality impact
assessments, the EPA, USFS, FWS, and NPS agree to form a
working group, to be known as the Inter-agency Work-group for
Air Quality Modeling (IWAQM). The Work-group shall meet at
least semi-annually and confer frequently by telephone. The
Work-group shall be comprised of at least one representative
from the EPA's Offices of Research and Development and Air
Quality Planning and Standards, an EPA Regional Office, the
NPS-Air Quality Division, the FWS-Air Quality Branch and the
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Article III,
USFS. A member of this group shall be selected as chair by the
Work-group and the chair shall be rotated among the members
annually.
The objectives of the Work-group shall include:
A. Review, on a continuing basis, the progress of
appropriate air quality simulation model development and
evaluation efforts occurring within each member's
organization, between members' organizations, or by
other relevant groups;
B.
E.
F.
G.
H.
Identify candidate air quality simulation modeling
techniques,the criteria by which the performance of
those modeling techniques shall be evaluated, and
sponsor suitable performance evaluations;
Provide the opportunity for State agencies
participate in Work-group functions;
to
Identify, following the performance evaluation, the most
appropriate air quality simulation modeling technique (s)
for use in class I analyses under various transport
conditions;
Ensure that all necessary documentation of the air
quality simulation modeling technique(s) and computer
codes judged acceptable by the Work-group are publicly
available, including user guides and other necessary
guidance;
Mutually conduct the necessary activities, to support
rulemaking, that will enable the adoption of the
acceptable air quality simulation modeling technique(s)
in EPA's Guideline on Air Quality Models (Revised'):
Mutually conduct training sessions on the use of the
accepted modeling technique(s);
Submit an annual report of its activities,
recommendations, and plans for the following year to
each organization signing this agreement.
Article IV.
Article V.
Article VI.
This MOU will remain in effect for five years from the date of
signature, at which time it will be reviewed.
This MOU does not create any enforceable rights or obligations
upon or in favor of any person or entity.
Key Officials
Key officials (technical personnel) representing each agency
are as follows:
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National Park Service
Mark Scruggs
National Park Service - AIR
P. 0. Box 25287
Denver, Colorado 80225-0287
John Vimont
National Park Service - AIR
P. 0. Box 25287
Denver, Colorado 80225-0287
U. S. Environmental Protection Agency
James Dicke
USEPA, OAQPS (MD-14)
Research Triangle Park, NC 27711
Jason Ching
USEPA, AREAL (MD-80)
Research Triangle Park, NC 27711
Alan Cimorelli
USEPA, Region 3 (3AM12)
841 Chestnut Street
Philadelphia, PA 19107
U. S. Forest Service
Richard W. Fisher
WO/WSA
USDA Forest Service
240 W. Prospect
Fort Collins, CO 80526
U. S. Fish and Wildlife Service
Bud Rolofson
National Park Service - AIR
P. 0. Box 25287
Denver, Colorado 80225-0287
Article VII. Termination: Any of the parties may terminate their
involvement in this agreement by providing 60 day written
notice to the other parties.
Article VIII. Nothing in this MOU impairs or in any vay affects the Federal
Land Manager's authority to utilize alternate modeling
techniques not agreed on by the parties herein, in order to
determine whether a proposed major emitting facility will have
an adverse impact on air quality related values in accordance
with Section 165(d) of the Clean Air Act (42 U.S.C. 7475(d)).
Nor does anything in this MOU affect or impair the EPA's role
in implementing the PSD provisions of the Clean Air Act. Each
party also reserves its right to submit comments on any
rulemaking or proposal in which modeling techniques are
selected or recommended.
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Article IX.
During the performance of this agreement, the participants
agree to abide by the terras of Executive Order 11246 on non-
discrimination and will not discriminate against any person
because of race, color, religion, sex or national origin. The
participants will take affirmative action to ensure that
applicants are employed without regard to their race, color,
religion, sex or national origin.
No member or delegate to Congress, or resident Commissioner,
shall be admitted to any share or part of this agreement, or to
any benefit that may arise therefrom, but this provision shall
not be construed to extend to this agreement if made with a
corporation for its general benefit.
2 0 NO V 1991
National Park Service
' '2 199)
U.S.AEn^ironmental Protection^
' mcy
U.S. Forest Service \
1 ^ f-'T'
4. 0 I\J h
U.S. Fish and Wildlife Service
15
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APPENDIX B
LISTING OF WORKGROUP MEMBERS
Group Chairman
Mark Scruggs
National Park Service - AIR
P. O. Box 25287
Denver, Colorado 80225-0287
National Park Service
John Vimont
National Park Service - AIR
P. O. Box 25287
Denver, Colorado 80225-0287
U. s. Environmental Protection Agency
James Dicke1
USEPA, OAQPS (MD-14)
Research Triangle Park, NC 27711
Jason Ching1
USEPA, AREAL (MD-80)
Research Triangle Park, NC 27711
Alan Cimorelli
USEPA, Region 3 (3AM12)
841 Chestnut Street
Philadelphia, PA 19107
John Irwin1
USEPA, OAQPS (MD-14)
Research Triangle Park, NC 27711
U. S. Forest Service
Richard W. Fisher
WO/WSA
USDA Forest Service
240 W. Prospect
Fort Collins, CO 80526
U. S. Fish and Wildlife Service
Bud Rolofson
National Park Service - AIR
P. O. Box 25287
Denver, Colorado 80225-0287
1 On assignment from the National Oceanic and Atmospheric
Administration, U.S. Department of Commerce.
16
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i TtCHWCAL HEHOK"; DAI A
/Piijse mru Ir.s;r.ictio>is on the re.ers^ -.tyo/v <.v -.- -. .-.•:>•
1 REPORT NO J2.
EPA-454/R-92-001 |
4. TITLE ANDSUBTITLE
Interagency Workgroup on Air Quality Modeli
Work Plan Rationale
7. AUTHOR(S)
John S. Irwin
9. PERFORMING ORGANIZATION NAME AND ADDRESS
Office of Air Quality Planning and Standarc
Technical Support Division
U.S. Environmental Protection Agency
Research Triangle Park, N.C. 27711
12. SPONSORING AGENCY NAME AND ADDRESS
3 = EC1P'ENT'S ACCESSION NO.
|5 REPORT DATE
m l-naartn i ^ 1992
-iJV) \j.n»^-i/ jg PERFORMING ORGANIZATION CODE
(8 PERFORMING ORGANIZATION REPORT NC.
i
i
|10. PROGRAM ELEMENT NO.
is !
11. CONTRACT/GRANT NO.
113. TYPE OF REPORT AND PERIOD COVERED
i
'14. SPONSORING AGENCY CODE
15. SUPPLEMENTARY NOTES
16. ABSTRACT
This document presents a status report and workplan rationale for the operation of
the Interagency Workgroup on Air Quality Modeling (IWAQM) . The workgroup was formed
to provide a focus for development of technically sound regional air quality models
for regulatory assessments of pollutant source impacts on Federal class I areas.
This paper was published in an effort to inform the sponsoring Agencies and other
interested parties out IWAQM activities.
17. KEY WORDS AND DOCUMENT ANALYS.S
a. DESCRIPTORS
Air Pollution
Meteorology
Air Quality Dispersion Model
Visibility
Aerosols
18. DISTRIBUTION STATEMENT
Release Unlimited
b.lOENTIFIERS/OPES ENDED TERMS
New Source Review
Air Pollution Control
19. SECURITY CLASS This Report)
Unclassified
20. SECURtTv CLASS This pert)
Unclassified
c. COSATl Field 'Group
21. NO. OF PAGES
23
22. PRICE
EPA Form 2220-1 (Rev. 4-77)
PREVIOUS EOITION S OBSOLETE
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