United States
Environmental Protection
Agency
Hazardous Waste Engineering
Research Laboratory
Cincinnati OH 45268
Research and Development
EPA/600/S2-86/064 Nov. 1986
x°/EPA Project Summary
User's Guide for the
Automated Inhalation
Exposure Methodology (IBM):
Addendum I
F. R. O'Donnell and A. C. Cooper
The Inhalation Exposure Methodol-
ogy (IEM) is an interactive system of
computer programs that provides an
estimate of the population distribution
around a chosen site and estimates of
annual-average, ground-level, air con-
centrations of pollutants released from
one or more sources at an industrial
complex located at the site and of the
population exposures associated with
the releases. The addendum summa-
rized herein presents revised output ta-
bles for the example problem given in
the IEM User's Guide. These revisions
result from corrections made to the at-
mospheric dispersion code after publi-
cation of the original document. The full
report also provides information on
preparation and manipulation of IEM
input data files.
This Project Summary was devel-
oped by EPA's Hazardous Waste Engi-
neering Research Laboratory, Cincin-
nati, OH, to announce key findings of
the research project that is fully docu-
mented in a separate report of the same
title (see Project Report ordering infor-
mation at back).
Introduction
The Inhalation Exposure Methodol-
ogy (IEM) is an integrated system of
computer programs that estimates
(1) near-field (within 50 km), annual-
average, ground-level air concentra-
tions of pollutants released from one or
more sources at an industrial complex
and (2) population exposures associ-
ated with the releases.1 The IEM was
developed to provide automatic access
to and linkage of on-line (1) meteorolog-
ical data, (2) population data, (3) a
slightly modified version (called
ISCLTM) of the long-term version of the
Industrial Source Complex (ISCLT) dis-
persion model, and (3) a concentration-
exposure estimation program (CONEX).
It produces various tables of concentra-
tion and exposure estimates. Although
IEM can be applied to a variety of prob-
lems, its principal use has been in esti-
mating annual-average pollutant con-
centrations and associated human
exposures in the vicinity of hazardous
waste incineration, treatment, and dis-
posal facilities.
An interactive version of the IEM sys-
tem has been implemented for use by
contractors and staff of the U.S. Envi-
ronmental Protection Agency, on the
IBM system at the National Computer
Center, Research Triangle Park, North
Carolina.
The full report also provides informa-
tion on preparation and manipulation of
IEM input data files. Topics covered in-
clude: (1) methods for manually creat-
ing and editing input files, (2) specific
instructions for creating, editing, and
using the four input data sets,
(3) comments on running IEM using
monthly and seasonal meteorological
data, and (4) comments on the default
values built into the IEM.
Revised Output Tables
The full report presents revised sam-
ples of IEM output tables for the exam-
ple problem in the IEM User's Guide.1
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The ISCLTM program used to produce
the original example-problem output
tables did not contain recent corrections
suggested by the authors of the ISCLT
computer code. The revised tables,
which are given in Appendix A of the
complete addendum, illustrate current
IEM outputs and replace the tables
given in Appendix E of the original IEM
User's Guide.
File Preparation and
Manipulation
The full report also provides informa-
tion about the preparation and manipu-
lation of IEM input data files. The report
outlines general procedures for manip-
ulating files using OBS (WYLBUR) on
the IBM system of the USEPA National
Computer Center, Research Triangle
Park, N.C. The following topics are cov-
ered.
• File Creation
• File Saving and Replacement
• File Deletion
• File Editing
• File Concatenation
In addition, the complete addendum
provides more detailed information on
the form of data files used by IEM. The
following areas are discussed:
1. Introduction of a user-specific me-
teorological data base in IEM by
manually creation of a MET input
data file.
2. Introduction of a user-specific pop-
ulation data base in IEM by manu-
ally creation of a POP input data
file.
3. Manual creation and/or editing of
the ISCLTM and the CONEX input
data files.
Reference
1. O'Donnell, F. R., P. M. Mason, J. E.
Pierce, G. A. Holton, and E. Dixon,
User's Guide for the Automated In-
halation Exposure Methodology
(IEM), EPA-600/2-83-029, U.S. Envi-
ronmental Protection Agency, Cin-
cinnati, Ohio (April 1983).
F.R. O'Donnell is with Oak Ridge National Laboratory, Oak Ridge. TN37831; andA.
C. Cooper is with University of Tennessee, Knoxville, TN 37916.
Benjamin L Blaney is the EPA Project Officer (see below).
The complete report, entitled "User's Guide for the Automated Inhalation
Exposure Methodology (IEM): Addendum 1," (Order No. DE 85-013629; Cost:
$11.95, subject to change) will be available only from:
National Technical Information Service
5285 Port Royal Road
Springfield, VA22161
Telephone: 703-487-4650
The EPA Project Officer can be contacted at:
Hazardous Waste Engineering Research Laboratory
U.S. Environmental Protection Agency
Cincinnati, OH 45268
United States
Environmental Protection
Agency
Center for Environmental Research
Information
Cincinnati OH 45268
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