              US Environmental Protection Agency
                   Office of Mobile Sources
              NONROAD Emissions Inventory Model

NR-NOTE3.TXT  October 16, 1998

This is one item in a series of notes being issued concerning the
DRAFT EPA NONROAD model, which was released on June 18, 1998, and
distributed at the workshop in Chicago on June 25.  Issues that
were known at the time of release are covered in a separate
Release Notes document, which was included on the distribution
CD. 


1) Reminder of review dates for technical reports

Comments on the Draft EPA NONROAD model and most of the technical
reports that were due by August 18, 1998.  Comments on the three
technical reports that were issued around early September are due
November 15, 1998.  These reports are: Geographic Allocation
(NR-014), Refueling (NR-013), and Deterioration (NR-011). 


2)  Geographic Allocation Maps now available

These maps are provided as an addendum to the technical report:
"Geographic Allocation of State Level Nonroad Engine Population
Data to the County Level," NR-014, that was recently released
(9/16/98) for a 60 day review period.  However, the posting of
these maps does not constitute an extension of the 60 day review
period.  These maps show county-level indicators used in the
model to allocate equipment population for the entire US.  These
GIF format files can be viewed using any web browser, many word
processors such as WordPerfect or MS-Word, and most other
software for viewing graphic image files. 


3) Updated Model and Data Files

The updated files listed below are ZIP'd to simplify some of the
downloads and so that the date stamps on the data files will be the
same on your computer after you download and unZIP them as they are on
the EPA systems.  This will help you keep track of the versions in use
and will help us provide support as needed.  If you are unfamiliar
with unZIPing files, please see the information provided on the EPA
NONROAD web site.


3a) Graphical User Interface (GUI) Updated (GUI02.ZIP -> NR-GUI.EXE)

The new version allows running both the reporting utility and the
core model directly from the GUI.  Other changes include removing
the need for user selection of an Output filename, since the GUI
automatically forces this to be the same as the OPTion filename
but with .OUT as the extension.  The same name with a .MSG
extension is given to the Message file.  Also, bugs were fixed
that would cause the GUI to crash if the user tried to Add
Equipment without first specifying which equipment to add, and
many of the Advanced Options were cleaned up to list the proper
input files.  The new file should be placed in your main
\nonroad\ directory. 


3b) Core Model Updated (NONRD02.ZIP -> NONROAD.EXE)

The upper limit allowed for gasoline RVP has been increased from
14 to 16 psi.  Also, the speed of the model has been greatly
increased when doing multi-county or multi-state runs.  The new
file should be placed in your main \nonroad\ directory.  Note
that a future version of the core model and equipment population
data files (*.POP) will allow different average horsepowers for
each horsepower range within each equipment type (SCC).  The
version provided here just uses the midpoint of the HP range in
all calculations, so your current POP files will work with this
one, and modified POP files will be provided at the same time the
newer core model is distributed. 


3c) Reporting Utility Updated (REPORT02.ZIP -> REPORTS.MDB)

Some small enhancements have been made to make it more user
friendly and function more reliably with the Graphic User
Interface.  The new file should be placed in your
\nonroad\reports\ subdirectory. 


3d) Phase-in Data File Updated (TECH02.ZIP -> TECH.DAT)

The diesel engine phase-in data was updated to use numbers from
the recent final nonroad diesel rulemaking rather than the
proposed rulemaking.  Also, phase-in data for gasoline
snowblowers was corrected (2-stroke and 4-stroke had been
switched).  The new file should be placed in your
\nonroad\data\tech\ subdirectory. 


3e) Emission Factor Files Updated (EMF02.ZIP -> *.EMF)

In the exhaust THC, CO, NOx, and BSFC data files the emission
factors for large 4-stroke spark-ignition engines (over 25 hp)
were updated to match the test data from CARB (Southwest Research
Institute report).  For exhaust THC, CO, and NOx revisions were
also made to the recreational marine inputs to reflect data
collected in connection with the 1996 recreational marine final
rule.  Also, all emission factors for gasoline snowblowers were
corrected (2-stroke and 4-stroke had been switched). 

Also, the crankcase emission factors (file crank.emf) were
further updated to more accurately reflect small spark-ignition
engine crankcase emission controls and allow modeling future
years with or without including controls on crankcase emissions.
These new files should be placed in your \nonroad\data\emsfac\
subdirectory. 


3f)  Deterioration Factor Files Updated (DET02.ZIP -> *.DET)

The deterioration for inboard recreational marine engines
(4-stroke gasoline, tech types M3, M10, M11, M12, and M16) was
set equal to the other large 4-stroke engines in the model (tech
type G4GT25).  Also, for the large 4-stroke engines (G4GT25) the
"b" factor in the deterioration equation was corrected from 1.0
to 0.5 per technical report NR-011.  Lastly, all the small
spark-ignition NOx deterioration factors were set to zero.
Further changes to these small engine DF's for phase 2 controls
are expected as that rule proceeds toward finalization.  These
new files should be placed in your \nonroad\data\detfac\
subdirectory. 


3g)  Seasonal Allocation File Updated (SEASON02.ZIP -> SEASON.DAT)

The main change was to add the records necessary to allow US
Total seasonal model runs.  These inputs for FIPS code 00000 were
derived by doing 50-State model runs for each month of the year
plus one annual total run, and then calculating the ratio of the
monthly 50-state to the annual 50-state emission totals for each
type of equipment.  One other change was to add records for
commercial snowblowers (SCC 22xx004036).  The new file should be
placed in your \nonroad\data\season\ subdirectory.


3h)  Activity File Updated (ACTIV02.ZIP -> ACTIVITY.DAT)

The spark-ignition recreational marine engine activities were
changed to match what was used in the 1996 EPA final rule.  The
new file should be placed in your \nonroad\data\activity\
subdirectory.


Thank you,
NONROAD Engine Emission Modeling Team
Assessment and Modeling Division, US EPA

Email:  nonroad@epa.gov
Fax:    734-214-4939
Web:    www.epa.gov/oms/nonrdmdl.htm
US mail:  US EPA Assessment and Modeling Division
          2000 Traverwood Drive
          Ann Arbor MI 48105
