-------
-------
EPA-450/4-92-003
TOXIC MODELING SYSTEM LONG-TERM (TOXLT)
USER'S GUIDE
U.S. Environmental Protection Agency
Office of Air Quality Planning and Standards
Research Triangle Park, North Carolina 27711
November 1992
U.S. Environmental Protection Agency
Region 5, Library (PL-12J)
77 West Jackson Boulevard, 12th Floor
Chicago, IL 60604-3590
-------
DISCLAIMER
This document has been reviewed by the Office of Air Quality Planning and Standards, U.S.
Environmental Protection Agency, and approved for publication. Approval does not signify that the
contents necessarily reflect the view and policies of the U.S. Environmental Protection Agency, nor
does mention of trade names or commercial products constitute endorsement or recommendation for
use.
ii
-------
PREFACE
The Toxic Modeling System Long-Term (TOXLT) is a personal-computer-based model that has
been developed in conjunction with the release of the new version of the EPA's Industrial Source
Complex (ISC2) Dispersion Models (EPA, 1992) and the promulgation of the EPA's "A Tiered
Modeling Approach for Assessing the Risks Due to Sources of Hazardous Air Pollutants" (EPA-
450/4-92-001). The purpose of TOXLT is to assist in the evaluation of the lifetime cancer risks
and chronic noncancer hazards that may result from long-term exposure to toxic air pollutants.
The ISCLT2 model is used to simulate annual average pollutant concentrations which are then
used to estimate cancer risk levels or hazard index values at each user-specified receptor. These
outputs presume:
1) a hypothetical individual exists at each receptor,
2) no contribution from "background" sources (i.e., sources not specifically included in
the simulation); and
3) pollutant contributions in a mixture are additive (i.e., ther are no synergistic or
antagonistic interactions between pollutants).
Interpretation of TOXLT2 results should be mindful of the above mentioned assumptions and the
inherent limitations of the ISC2 dispersion model This document describes the modeling system
and provides instructions on its implementatioa
iii
-------
ACKNOWLEDGMENTS
The Toxic Modeling System Long-Term (TOXLT) User's Guide was written by J. W. Dunn,
Research Triangle Institute, Research Triangle Park, North Carolina. The work was funded by the
Environmental Protection Agency under Purchase Order No. 2D1482NALX, with Melissa Watkins
as Project Manager. Additional guidance was provided by David Guinnup, EPA, and helpful
insights into die structure of the Industrial Source Complex computer models were provided by
Roger Brode, Pacific Environmental Sciences, Research Triangle Park, North Carolina.
iv
-------
TABLE OF CONTENTS
DISCLAIMER "
PREFACE iii
ACKNOWLEDGMENTS iv
TABLE OF CONTENTS v
LIST OF FIGURES vii
LIST OF TABLES viii
1. INTRODUCTION , 1
1.1 BACKGROUND , 1
1.2 OVERVIEW OF TOXLT 1
1.3 MANUAL SCOPE AND ORGANIZATION 3
2. TOXLT ALGORITHMS 5
2.1 OVERVIEW 5
2.2 ISCLT2 ALGORITHM 7
2.3 RISK ALGORITHMS 7
2.4 RISK LIMITATIONS 12
2.5 SUMMARY OF TOXLT INPUTS AND OUTPUTS 12
3. PREPARING TOXLT INPUT FILES 13
3.1 PREPARATION OF ISCLT2 INPUT FILES 13
3.2 PREPARATION OF RISK INPUT PARAMETER FILE 18
4. EXECUTING THE TOXLT SYSTEM 23
4.1 SYSTEM REQUIREMENTS 23
4.2 EXECUTION PROCEDURE 26
4.2.1 Interactive Execution 26
4.2.2 Batch Execution 39
5. TOXLT OUTPUT 41
5.1 GENERAL OUTPUT 41
5.2 ISCLT2 PRINTOUT FILE 41
-------
5.3 RISK PRINTOUT FILES 41
6. EXAMPLE TOXLT APPLICATIONS 43
6.1 EXAMPLE NUMBER ONE 43
6.2 EXAMPLE NUMBER TWO 78
References 95
vi
-------
LIST OF FIGURES
2-1 TOXLT System Flow Diagram 6
3-1 An example ISCLT2 input file 14
4-1 TOXLT main menu screens with user responses underlined 27
4-2 TOXLT screen when Main Menu Options 1 or 3 are selected 32
I
4-3 RISK screen for Table Option selection (user responses underlined) 34
4-4 TOXLT screen when Table Option Q (quit) is selected and sequel to terminate 35
4-5 Example screen prompts and responses to create a RISK parameter control file
interactively t 37
6-1 Example #1 RISK input parameter file 44
6-2 Example ISCLT2 printable output file (partial listing) 46
6-3 Partial Listing of a RISK Basic Table Print File 53
6-4 Partial listing of an Example RISK Table Option 1 55
6-5 Partial listing of an example RISK Table Option 2 60
6-6 Partial listing of an example RISK Table Option 3 65
6-7 Partial listing of an example RISK Table Option 4 70
6-8 Example ISCLT2 input, Cartesian grid, Example 2, Tiered Modeling 79
6-9 Partial listing of a TOXXFILE, Tiered Modeling 82
6-10 RISK input parameter file, Tiered Modeling example 84
6-11 Partial Listing of RISK Table Option 4, Example #2 86
ss
vii
-------
LIST OF TABLES
2-1 Menu Options for RISK 11
3-1 Example RISK input parameter file (filename EXAMP1.DAT) 19
4-1 Example TOXLT batch input file, filename RESPONSE.INP 40
viii
-------
1. INTRODUCTION
1.1 BACKGROUND
Certain industrial facilities emit airborne toxic chemicals that can have serious health effects. The
task of estimating exceedances resulting from intermittent releases of such toxic chemicals is being
accomplished by the Toxic Modeling System Short-Term (TOXST) using short-term pollutant
concentrations from ISCST2 (Industrial Source Complex-Short Term). Subsequently, the Toxic
Modeling System Long-Term (TOXLT) computer system has been established to examine both the
lifetime cancer risks and the chronic noncancer hazard indexes associated with toxic pollutants.
This manual describes TOXLT and provides information on its operation. For guidance on the
interpretation of TOXLT results and its appropriate usage, the user should consult "A Tiered
Modeling Approach For Assessing The Risks Due To Sources of Hazardous Air Pollutants" (EPA,
1992).
1.2 OVERVIEW OF TOXLT
*
This manual describes the TOXLT (Toxic Modeling System Long-Term) system and its
component computer programs. TOXLT is an interactive, PC-based computer system that is
designed to assist users in analyzing the air quality impacts of long term releases of toxic materials
from industrial sources using long-term pollutant concentrations from ISCLT2 (Industrial Source
Complex Long-Term) computer model As such, limitations of the applicability of TOXLT are
identical to limitations of the applicability of the ISCLT2 model The TOXLT system is
comprised of three major components:
A main program that assists the user in executing ISCLT2 and the
risk computations and table generating portions of TOXLT;
The ISCLT2 Gaussian Dispersion Model (EPA, 1992, version dated
92273), which provides the dispersion estimates for the RISK post-
processor, and
The RISK post-processor program and its subroutines, which compute
and tabulate receptor-specific cancer risks and chronic noncancer
hazard indexes
TOXLT provides a menu of options, and the user must enter the appropriate control and input data
depending on the option selected. Transfer of data from ISCLT2 to RISK is handled automatically
-------
within the TOXLT system. RISK also provides menu options for selection of tables of cancer risk
and chronic noncancer hazard indexes.
ISCLT2 input and output files used within the TOXLT system are identical to those described in
the EPA's User's Guide For The Industrial Source (ISC2) Dispersion Models (EPA-450/4-92-008),
Vol. I with Addendum. The input files contain information on physical source parameters (e.g.,
location, stack parameters, etc.) and meteorological conditions. RISK uses the ISCLT2 input run
control file to set up the source and receptor grids and identify output file names used in ISCLT2.
RISK does not use the meteorological file(s). The ISCLT2 output files of dispersion estimates
used by RISK are referred to as TOXXFILEs, a standard user-specified option in ISCLT2.
RISK takes the receptor/source specific concentration 00 from ISGLT2 TOXXFILEs and
multiplies that concentration by a pollutant/source specific emission rate multiplier. This result is
multiplied by pollutant-specific unit cancer risk factors to determine cancer risks and by chronic
threshold concentration values to determine chronic noncancer indices. The risk factors, threshold
concentrations, and emission rate multipliers are user-provided input data to RISK. RISK uses
these data to create various tables and statistics..
The Toxic Modeling System Long-Term (TOXLT) is a personal-computer-based model that has
been developed in conjunction with the release of the new version of the EPA's Industrial Source
Complex (ISC2) Dispersion Models (EPA, 1992) and the promulgation of the EPA's "A Tiered
Modeling Approach for Assessing the Risks Due to Sources of Hazardous Air Pollutants" (EPA-
450/4-92-001). The purpose of TOXLT is to assist in the evaluation of the lifetime cancer risks
and chronic noncancer hazards that may result from long-term exposure to toxic air pollutants.
The ISCLT2 model is used to simulate annual average pollutant concentrations which are then
used to estimate cancer risk levels or hazard index values at each user-specified receptor. These
outputs presume:
1) a hypothetical individual exists at each receptor;
2) no contribution from "background" sources (i.e., sources not specifically included in
the simulation); and
3) pollutant contributions in a mixture are additive (i.e., ther are no synergistic or
antagonistic interactions between pollutants).
Interpretation of TOXLT2 results should be mindful of the above mentioned assumptions and the
inherent limitations of the ISC2 dispersion model This document describes the modeling system and
provides instructions on its implementation.
-------
1.3 MANUAL SCOPE AND ORGANIZATION
This user's guide provides information needed to develop input data for and execute the TOXLT
system on an IBM-compatible personal computer (PC). Although TOXLT will run on most IBM-
compatible PCs using some version of Microsoft (MS) DOS, the minimum recommended system
requirements for acceptable performance are: 80286- or 80386-based IBM-compatible PC with
monochrome monitor, math co-processor, a 40MB hard disk, MS-DOS 3.2 or higher, and 640K RAM.
This user's guide describes the algorithms of TOXLT, input parameters, formats for input parameters,
and the output produced. It concentrates on aspects of the RISK algorithm, since it is assumed that
the user is familiar with the preparation of the input data for and the interpretation of the output data
from the ISGLT2 algorithm or has access to the ISC2 User's Guide.
The user's guide consists of six sections. Section 1 provides a general introduction to the TOXLT
system. Section 2 describes the principal concepts, applications, and algorithms of the TOXLT
system. Section 3 contains a description of the content and formats of the input files for the system.
Section 4 provides information needed to execute the system on an IBM-compatible PC. Section 5
describes the output produced by the system. Finally, Section 6 presents an example application of the
system for two test cases with input and output data listings.
-------
2. TOXLT ALGORITHMS
2.1 OVERVIEW
In this section, the TOXLT algorithms are briefly described. An overview of the entire TOXLT
system is shown in Figure 2-1. TOXLT consists of two main algorithms:
The ISCLT2 Gaussian Dispersion Model (EPA, 1992, version dated
92273), which provides the dispersion estimates, and
The TOXLT program, with RISK post-processor, that assists the user
in creating pollutant-specific output files.
Information needed to prepare input data is presented in Section 3. Information needed to prepare the
ISCLT2 input data (i.e., the preprocessed meteorological data file and the ISCLT2 control data file) is
provided in the ISC2 User's Guide Vol I with Addendum (EPA, 1992) although two example input
files and information on the proper specifications of the ISCLT2 model options and source emission
rates are presented in Section 3 herein.
-------
f INPUT DATA A
\_ STAR data J
/INPUT DATA A
Cancer risk factors,
chronic noncancer .^
emission rates as
\ functions of source /
\and pollutant J
TOXLT Main
Program
ISCLT2
Subroutine
*
/OUTPUT DATAA
[ Concentration versus
1 source and receptor
V for unit emissions 7
i
RISK
Subroutines
t
OPERATION
Set the units and produce
tables of risk and hazard
for a particular pollutant
versus source and
receptor
t
OPERATION
Produce summary tables
of total risk and hazard
versus source and/or
receptor
*
OPERATION
Perform statistical
operations to obtain
various user specified
output
*
/OUTPUT DATA^N
I User specified sorted data
\User specified tables J
(|ND>-*
*
^
/e
/ p
?
1
\ c
\N
MVBMH^H
^ -^
X^/IENU N
\Control data/
^^^ ^^^*
/o\
/ p \
\ o /
xy
^*- ~».^
^Control data^
. ^
\
)
Figure 2-1 TOXLT System Flow Diagram
-------
2.2 ISCLT2 ALGORITHM
The algorithm for the ISCLT2 dispersion model is described in detail in the ISC2 User's Guide Vol II.
It is assumed that the reader is familiar with that algorithm or has access to the user's guide. The
ISCLT2 model included in the TOXLT system is the version dated 92273 (with the TOXXFELE
option). A copy of this version was converted from a stand-alone, executable main program to a
subroutine that is called by TOXLT. Specific changes included insertion of "SUBROUTINE ISCLT2"
as the first statement, a passed flag to indicate to ISCLT2 whether to merely set up input data or
continue on into calculation of concentrations, and a RETURN statement instead of STOP to enable
returning to TOXLT. In addition, the user is prompted by the TOXLT system to provide the ISCLT2
input and output file names; this is a change in ISCLT2 usage where the user provides the names on
the PC DOS command line when executing ISCLT2. These modifications are sufficiently simple and
straightforward as to permit similar modification in the event of future changes to ISCLT2. The
resulting ISCLT2 subroutine code is available from the EPA Technology Transfer Network SCRAM
bulletin board.
Note that although the ISCLT2 algorithm has been incorporated as a subroutine into the TOXLT
system, the primary, stand-alone main program version of ISCLT2 can still be run separately and
independently to provide input to the TOXLT system by specifying the TOXXFILE option when
ISCLT2 is to be executed. The name of the TOXXFILE subsequently can be provided to the TOXLT
system under its option to "run RISK only."
2.3 RISK ALGORITHMS
There are two algorithms in RISK. One is for the computation of cancer risks; the other is for
computation of chronic noncancer hazard index values. Lifetime cancer risk is obtained by
multiplication of the pollutant concentration by a unit cancer risk factor. The chronic noncancer
hazard index is obtained by dividing source/receptor concentration by a chronic threshold
concentration.
The cancer risk algorithm requires the following input data: the receptor/source-specific concentrations
X from ISCLT2, pollutant-specific unit cancer risk factors, and pollutant/source-specific emission rates.
The unit cancer risk for a toxic pollutant is the lifetime cancer risk for a person exposed to the
pollutant at an annual average level (concentration) of 1.0 ug/m3.
Thus,
Risk (of cancer) = Unit Risk * Concentration.
-------
Unit Risk has dimensions of (ug/m3)"1 or, generally, reciprocal concentration, so that "Risk" is
dimensionless.
RISK computes lifetime cancer risk as
R = X *c*P*u
where:
X = average annual concentration, (pg/m3)
c ss the emission rate multiplier, dimensions discussed below
p = the amount of the pollutant as a mass percentage of the total emissions from
the source, dimensionless
u = the pollutant unit cancer risk, (ug/m3)'1 - *
The emission rate multiplier is provided to enable the user to conveniently deal with situations such as
the following. Perhaps it is desired to modify source emission rates used in a particular ISCLT2 run
by either an increase or decrease of some factor c. The resulting concentrations, x» will be
proportionately increased or decreased and can be re-computed conveniently as (%<:) without re-
running ISCLT2 to obtain the new %. Thus the user can easily engage RISK in "what-if' scenarios
when multiple sources are involved by increasing emissions of some sources and decreasing others to
observe the impact on risk at various receptors. As another example situation, it could happen that
the concentration as computed by some ISCLT2 run is not in units of ug/m3, which would cause the
product Oc'«) not to be dimensionless. Thus % is to be replaced by (% c) where c is to be
specified so that (x 'c) has dimensions compatible with those of unit risk, u.
The fact that not all the emissions from a source comprise a single constituent (toxic) is accounted for
by the mass percentage factor, p. Thus, if toxic / constitutes p percent by mass of the emissions from
a source, the resulting concentration of constituent i is (x p). Note that when multiple toxics are
emitted from a source, their individual mass percentages p need not sum to 100 percent The RISK
post-processor calculates total cancer risk at a receptor by summing the cancer risks due to each
pollutant at that receptor (additive assumption).
8
-------
The chronic noncancer hazard algorithm of the RISK program requires the following input data:
receptor/source-specific concentrations x from ISCLT2, pollutant-specific chronic threshold
concentration values, and pollutant/source-specific emission rates.
Thus,
Hazard (index) = Concentration / Threshold Value.
The threshold concentration value has dimensions of (jig/in3) so that "Hazard" is dimensionless.
RISK computes chronic noncancer hazard index values as
R=X*c*p*A
where: % = average annual concentration, (ug/m3)
c = the emission rate multiplier, dimensions discussed below
p = the amount of the pollutant as a mass percentage of the total emissions from
the source, dimensionless
h = I/the pollutant chronic noncancer threshold = l/(pg/m3)
The RISK post-processor calculates the total hazard index at each receptor by summing the hazard
index values for each pollutant/source combination at each receptor (additive assumption).
In the following discussion of output table options available within RISK,
"risk" = lifetime cancer risk, and
"hazard" = chronic noncancer hazard index.
The input data are used to create a basic table and, optionally, four other tables. The selection of the
optional tables is menu-driven within RISK as shown in Table 2-1. The basic table is so-called
because all other tables are derived from it It is created by application of the foregoing algorithms to
each source/receptor combination for each pollutant The result is a table of the lifetime cancer risk
and the chronic noncancer hazard index associated with a particular pollutant at each receptor and for
each source. Selecting an option also automatically initiates a ranking of the data in the table. The
ranked top ten and average of each table are saved in the same table file.
-------
NOTE: In the following discussion of the various Table Options, Option #4 should be processed as
specified in the EPA's "A Tiered Modeling Approach For Assessing The Risks Due To Sources Of
Hazardous Air Pollutants" (EPA, 1992).
Table Option #1 is merely a re-formatting of the basic table and is intended both to reduce the number
of lines in the table and to improve readability. This option will produce a table of risks and a table
of hazards for each pollutant considered. Additionally, tables of the ten largest risks and of the ten
largest hazards for each pollutant by receptor and source are included as part of the file. The top ten
are presented in descending order.
NOTE: If you do not want to analyze hazards, all hazard threshold values should be entered by the
user as zero. RISK tests for this "all-zero" condition, and produces no hazard table whenever all
hazard thresholds are zero. This applies to cancer risks as well as hazards for any of the tables
produced under the other options.
Option #2 in Table 2-1 (the risk and the hazard for a particular pollutant due to all sources) is created
by summing the data in the basic table over all sources. A table of risks and one of hazards as a
function of receptor over all sources will exist for each pollutant. Also, tables of the ten largest risks
and hazards for each pollutant as a function of receptor from all sources are included; and the values
are presented in ranked order.
The total risk and the total hazard due to all pollutants as a function of source and receptor (Option #3
in Table 2-1) are found by summing the data in the basic table over the individual pollutants. The
result is a table showing the total risk and one showing the total hazard at each receptor and for each
source. As a part of this analysis, tables of the ten largest values of the total risk and of the toted
hazard as a function of each receptor and each source are developed. The values are presented in
ranked order.
Finally, the total risk and the total hazard at each receptor due to all pollutants and all sources (Option
#4 in Table 2-1) are obtained by summing the data in the basic table over pollutants and sources. The
result will be one table for total risk and one for total hazard at each receptor due to emissions of all
pollutants from all sources. Tables giving the receptors having the ten largest values of total risk and
of total hazard over all pollutants and all sources are included and presented in ranked order. Included
in the tables is the contribution of each source to the total risk. Also included are tables that break out
the contribution of each pollutant and each source to the ten largest values.
Each table or set of tables is placed into a file that can be accessed after exiting from the TOXLT
system by simply invoking the TYPE" or "PRINT" command at the DOS prompt
10
-------
TABLE 2-1: Menu Options for RISK
Note: "risk" = lifetime cancer risk
"hazard" = chronic noncancer hazard index
OPTION #1:
The risk and the hazard for each pollutant at each receptor and for each source; and the ten largest
risks and hazards as a function of receptor for each pollutant and source.
OPTION #2:
The risk and the hazard for each pollutant at each receptor due to all sources; and the ten largest
risks and hazards as a function of receptor, due to all sources.
OPTION #3:
The total risk and the total hazard at each receptor from all pollutants and each source; and the ten
largest total risks and total hazards from all pollutants as a function of receptor for each source.
OPTION #4:
The total risk and the total hazard at each receptor from all pollutants due to all sources; and the
ten largest total risks and hazards from all pollutants and sources as a function of receptor.
11
-------
2.4 RISK LIMITATIONS
Accuracy and applicability of RISK results are governed by the accuracy of ISCLT2 concentration
calculations and the user's certainty in the accuracy of the unit cancer risks, threshold concentrations,
and the pollutant component mix in the emissions for each emitting source modeled. In addition, the
accuracy of risk and hazard calculations is limited by the applicability of the additive assumptions for
pollutant mixtures to the situation being simulated.
2.5 SUMMARY OF TOXLT INPUTS AND OUTPUTS
As illustrated in Figure 2-1, TOXLT applications involve the execution of the ISCLT2 Gaussian
dispersion model followed by execution of the RISK program. The ISCLT2 subroutine provided with
TOXLT reads the same file of input parameters and meteorological data used with the standard
ISCLT2 model described in the ISC2 User's Guide Vol. I. As noted in Section 3.1, the TOXXFDLE
option must be specified in the ISCLT2 input parameter file so that ISCLT2 will prepare the file of
screened dispersion estimates required by the RISK model.
Typically in most ISCLT2 applications, a source emission rate of 1 g/s is specified in the ISCLT2
input parameter file. In some situations, however, other emission rates may be used. The emission
rate multiplier in the RISK user-supplied input file will enable compatibility between emission rates,
calculated concentrations, and pollutant unit risk factors. What is critical is that the product of the
ISCLT2 emission rate, whether 1 g/s or otherwise, and the RISK emission rate multiplier be equal to
the actual emission rate of the source under study. Additionally, it should be emphasized that the
appropriate emission rate input values for TOXLT are annual average emission rates which have been
converted to units of grams per second. Note further mat mis is not necessarily the emission rate of
an individual pollutant; that rate is accounted for by specifying the pollutant's mass percentage of the
total emission.
RISK requires as input the dispersion TOXXFILE(s) produced by ISCLT2 and an input parameter
file that provides information pertaining to the particular toxics to be analyzed.
Outputs produced by TOXLT include the standard ISCLT2 printout as described in the ISC2 User's
Guide VoL I and the RISK program printout files as described in Sections 2.3 and 5.3.
12
-------
3. PREPARING TOXLT INPUT FILES
In the previous chapter we presented an overview of the input and output files associated with the
TOXLT system, particularly those of the RISK program. In this chapter we provide a detailed
description of the contents and formats of the input files. Output files are described in Section 5 and
presented in detail in the examples in Section 6.
3.1 PREPARATION OF ISCLT2 INPUT FILES
ISCLT2 uses joint frequency distributions of wind speed class, by wind direction sector, by stability
category, known as STAR summaries (for STability ARray). These data are discussed in detail in the
ISC2 User's Guide Vol. I (EPA, 1992). Note that these data arc read from a file separate from the
input control file. The identification (name) of the STAR file is included in the ISCLT2 input control
file.
The ISCLT2 input file of control parameters is identical in content and format to the "card image input
file" of the ISCLT2 model as described in the ISC2 User's Guide Vol. I (EPA, 1992). Certain
options must be specified in the input parameters so that ISCLT2 will produce the desired dispersion
estimate output file. Specifically:
an averaging period of either ANNUAL or PERIOD must be specified
a TOXXFDLE for the chosen averaging period must be specified
Figure 3-1 shows an example ISCLT2 input listing. This file is similar to the example ISCLT2 input
file that was available on the EPA SCRAM Bulletin Board in May 1992. The example has been
annotated with «« symbols to indicate pertinent options for TOXLT. Lower case has been used to
indicate changes from the SCRAM bulletin board original, and some of the original has been
commented out with ** symbols in the first two columns, an ISCLT2 feature. The output associated
with this particular input file will be presented in Section 6.
13
-------
a file in same directory as TOXLT.EXE
Long Term Model, ISCLT2.
utfil.nam
in lower case and
O CM M
O ft, 10
rH T3
«J A EH O
.J g
U 1
10 U EH EH
O O
O -tJ «
I < X §
4 -< 6-1
r7 b -C «
U (31 0) 3
Q VB -H XJ C
0 -«3 EH C
S Z <0
M
EH itf
^ f*t
o B v v
CO W V rP V
H EH V < V
V 06 V
S S V D V
ca EH ofi
s -o
{£ 4J O O
O 3 Z -H
b O O U
Z *°S,
a: | EH z
EH O D CO
co M m! W
2 «< r3 Z « Z
U ij O 5 rH H
EH h Oi Oi fH fa
8
CM
O
o
r»
rH
rH
O
0
o
CM
^*
O O
o
m
en
.
EH 0
2 0
H rH
O
Oi
iH iH
g § 5
H H 2
EH EH -2
Oj < CU
5 y o
EH O 01
CO M CO
CO CO CO
CM
O
o
r»
rH
rH
0
O
o
CM
m
o o
o
in
o o
t
. ^r o
hH rH VO V0
O rH rH
Ol
CM CM CM CM
Z S EH Q
O 3 O W
H a ae s
EH 2 g g
U U H H
0 2 D D
ij co to OQ
o o o o
CO CO CO CO
1)
«:
I
V
c
-------
o
*
z
H
O
Oi
CO
LOCATION
O
CO
CM
r»
rH
O
CM
*
O
m
o
o
rH
CO
SRCPARAM
O
CO
o
CO
*
VO
rH
CO
BUILDHGT
O
CO
o
o
CO
«
VO
rH
CO
BUILDHID
O
CO
o
4 POINT
LOCATION
O
CO
CM
r»
rH
o
CM
a
CJ
H
i
i.
<« Another
V
V
o
u
4>
O
ts
STARTING
£
N i
£7 c
O *
-u :
o t
2 S
-H <
INPUTFIL
D
j
3
J
1)
D
J
<
5
0
*
t
3
>|
-4
o
rH
ANEMHGHT
§
g
H
1
CO
rH
CM
CM
r-
co
rH
SURFDATA
§
§
co
oo
cr>
rH
CO O
?! <
CO H
rH CO
UAIRDATA
STARDATA
tc
*J
ex
§
£2
"ex
3
£
-------
to
w EH
1
z
H
t-3
Cd
«
CO
Ed
f«1
K
o
Ed
£
Ed
OS
D
EH
3
Cd
S
W
EH
OS
H
<
EH
5S
Cd
H
CO
as
o
EH
CO
9
EH
CO
0)
EH
CO
0
EH
CO
OQ
i4*
EH
co
CO
EH
CO
to
EH
O
in
EH
y
^1*
EH
5
co
EH
d
CM
EH
O
rH
EH
0
1 0
1 00
1 oo
1 CM
1 O
i co'
1 00
1 CM
1 O
1
1 co
1 00
1 CM
1 0
1 co'
1 CO
1 CM
1 0
1
1 CO
1 00
1 CM
1 0
1
1 oo
1 00
1 CM
o
CO
00
CM
0
co
CO
CM
o
co
CO
CM
o
CO
oo
CM
o
CO
oo
CM
0
oo
oo
CM
o
CO
00
CM
o
CO
00
CM
o
oo
CO
CM
o
CO
oo
CM
o
CO
co
CM
o
CO
00
CM
o
CO
oo
CM
0
00
oo
CM
o
CO
00
CM
o
00
oo
CM
o
00
CO
CM
0
CO
00
CM
1
^^
co
A
Ed
EH
M
JJJ
«H>
EH
H
W
A
B
rH
o
z
M
X
M
*
1
co
co
CO EH
Ul
O
CM
ooooooooooooooooooo
+ + + + + + + + + + + + + + + + + + +
CdCdCdCdCdCdCdCdCdCdCdCdCdCdCdCdCdCdCd
inooooomoooooinooooo
CM m in
CM
o 'inin
oooooooooooo
o o o o
EdfidEdEdEdEdEdCdEdEdEdEdEdCd
m m »*
o o o
r -r -r -r +
Ed Ed Ed Ed Ed
inooooomoooooinooooo
CMininooocMinmooo
CM
rH CM rH rH «H rH rH
CM in in
CM rH rH
O O
in
O CM
rH CM
^^^^lOin^^^^ioin** *'* m m T
ooooooooooooooooooo
-r-r-r + -4--r-r + -t--f-H--rH-H-H--r-r-T--r
CdEdCdEdCdCdCdEdEdEdCdEdCdCdCdCdCdCdCd
moooooinooooomoooooin
CMininooocMmmooocMintnooocM
CMlHiHfHrHrHCMrHrHrHrHrHCMrHrHrHfHrHCM
*f*r*f*fir>tet'*f'*'*''*'tr>ir>'*'
ooooooooooooooooooo
J.-I.J.J.J.J.J.J.J.J.J. + + + + + + + 4.
CdCdWCdCdWWH
H I
W EH | CdCdCdtdUCdCdCdcbtd
inooooomoooo__. _ _
CMininooocMinmooocMinm
CMrHrHrHrHfHCMrHrHrHrHrHCM
O in O O O O O
O O O
COEHrtlffJrHCMOO'J'intOrHCMOO
m
rH CM 00
m
AAA&AAOOOQ&OA&AAA
wtfatatauauzzzzzz" ~~
CO
H M H H
* f tf *jf
& if &* if
H M M M H H
QtQtaiQiOjOu*'********^
cocococococococacoc/icoco
o
«K
*^
1
§
X
U
co
I
<*.<**< **'*<,'<'* <-*<*l * <*.
* « * *
-------
^« * J Z
CO
V
"S,
X
u
I
en
-------
33, PREPARATION OF RISK INPUT PARAMETER FILE
The example RISK input parameter file in Table 3-1 shows the percentage composition of four
pollutants for each of the four ISCLTZ-modeled stacks in the ISCLT2 input example (Figure 3-1
above). Since the unit cancer risk factors for each pollutant are in precisely reciprocal units of the
ISCLT2-calculated concentration, namely ug/m3, the emission rate multipliers are shown as 1.0 If, for
example, the ISCLT2 emission rates had been specified as 2g/s instead of Ig/s, the emission rate
multipliers should be 0.5. Note that each Line Number 15 through 18 corresponds to one of the four
ISCLT2-tnodeled stacks and contains the Source Number, emission rate multiplier, and four mass
percentages, one for each of the four pollutants.
18
-------
TABLE 3-1 Example RISK input parameter file (filename EXAMP1.DAT)
Line
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
12
13
14
Record
Type*
1
2
3
3
4
3
3
4
3
3
4
3
3
4
5
5
5
5
Example of Actual
Entries in File
RISK run ID
4
8.3e-6
1.0
Pollutant_A
1.3e-5
1.0
PoUutant_B
l.Oe-4
1.0
Pollutant_C
6.8e-5
1.0
Pollutant_D
1 1.0 4.0 2.0 1.33 1.
2 1.0 .1 .1 .1 .1
3 1.0 0. 0. 0. .1
4 1.0 10. 0 10. 0.
Corresponding RISK Internal Parameter Names
RunID
NumTox
unitrs(l)
hazard(l)
ToxNam(I)
unitrs(2)
hazaid(2)
ToxNam(2)
unitrs(3)
hazaid(3)
ToxNam(3)
unitrs(4)
hazard(4)
ToxNam(4)
idum,convf(l),percen(l,l),percen(2,l),percen(3,l),percen(45i)**
idum,convf(2),percen(l^),percen(2^),percen(3,2),percen(4,2)
idum,convf(3),pereen(l,3),percen(2,3),percen(3,3),percen(4,3)
idum,convf(4),percen(l,4),percen(2,4),percen(3,4),percen(4,4)
"Corresponds to record types described in text
**percen (i j) is the mass percentage of the i-th pollutant in the j-th source.
19
-------
Free format is used throughout the file except for textual material, e.g., the RISK run identification, an
80-character string, and the pollutant names, 40-character strings. Descriptions of the individual
records in the input file follow.
Record 1
RunID Title of the RISK run; up to 80 characters
Record!
NumTox Number of air toxics being modeled; limit = 20
Record types 3 and 4, which follow, occur NumTox times.
Record Type 3
UnitRs Unit risk factor for this toxic in units of (ug/m3)'1 or
Hazard Chronic noncancer threshold concentration for this toxic in
units of (ug/m3)
Record Type 4
ToxNam Identification of this air toxic; limit = 20 characters
The number of Record Type 5, which follows, should equal the number of sources. The user should
know the number of sources, nsource, from the associated ISCLT2 run.
Record Type 5
idum Source identification number, 1 through nsource. While not
necessarily equal to the source identifications used by ISCLT2
(which might be 1001, 1002,.. for example), the numbers
should coincide in order.
convf Emission rate multiplier that relates ISCLT2 emissions rate,
concentrations, and unit risk factors and threshold
concentrations. Enter 1.0 as the default value.
20
-------
percen The amount of each of the NutnTox pollutants as a mass
percentage of the emissions from this source. There should be
NumTox values of percen. The values can be continued onto
as many following records as necessary.
The input parameter file may be created by using a word processor or text editor, or it can be created
interactively by executing the TOXLT system and going to the "run RISK" option in the main menu.
When RISK prompts you for the name of the input parameter file, enter a blank. RISK will then
proceed to prompt you for the data necessary to construct the input parameter file.
21
-------
-------
4. EXECUTING THE TOXLT SYSTEM
4.1 SYSTEM REQUIREMENTS
TOXLT is designed to be executed on an IBM-compatible personal computer (PC). While the
TOXLT system has been tested fully only on an Intel 80386-based IBM-compatible PC with math
coprocessor, the executable version available on the EPA SCRAM bulletin board should run on any
IBM-compatible PC, with or without a math coprocessor. Faster machines are recommended for
higher performance, but are not necessarily required. MS DOS 5.0 was used in testing the TOXLT
system, but some other versions of DOS may serve as welL To insure acceptable performance, the
minimum recommended system configuration is a 286-based PC with a 40 MB hard-disk drive,
monochrome monitor, 640K RAM, and DOS 3.2 or higher.
TOXLT disk storage requirements are largely a function of the complexity of the dispersion modeling
scenario and the number of table options selected. Disk storage requirements for a complex of four
emissions sources are as follows:
4 pollutants. 36 receptors 2 pollutants. 112 receptors
TOXLT executable program code 485 Kb 485 Kb
ISCLT2 input data 7 Kb 7 Kb
Meteorological data (seasonal) 24 Kb
Meteorological data (annual) 6 Kb
ISCLT2 printed output 85 Kb 37 Kb
ISCLT2 TOXXFILE output 12 Kb 35 Kb
ISCLT2 errormsg output 1 Kb 1 Kb
RISK input data 1 Kb 1 Kb
RISK output (all 4 options selected) 105 Kb 114 Kb
Totals 572 Kb 538 Kb
The sizes of the ISCLT2 output files are determined by the number of receptors and sources specified
and the time interval represented by the STAR meteorological data. Data for twelve months would
require a larger file than seasonal (four periods) or annual (one period) data . The difference between
the ISCLT2 printed output file sizes above is attributable to the difference between a four-seasonal
STAR summary and an annual STAR summary.
TOXLT memory (RAM) requirements depend on parameter values set in the ISCLT2 include file
MAIN1LT.INC. These parameter values determine the dimensions of arrays that are dependent on the
number of sources, the number of receptors, and the number of receptor grid networks. Since the user
may need to change these values for his own application (the ISC2 User's Guide gives specific
23
-------
instructions), it can only be stated that the memory requirement of TOXLT slightly exceeds that of
ISCLT2.
The TOXLT system comprises source code, executable code, and example input data as follows:
Source Code
TOXLT.FOR
INCLUDE.FOR
SUBISCLT.FOR
INPANN.FOR
CALC1LT.FOR
CALC2LT.FOR
CALC3LT.FOR
COSETLT.FOR
INPSUMLT.FOR
MESETLT.FOR
METEXTLT.FOR
OUSETLT.FOR
OUTPUTLT.FOR
PRISELT.FOR
RESETLT.FOR
SETUPLT.FOR
SIGMASLT.FOR
SOSETLT.FOR
MAIN1LT.INC
MAIN2LT.INC
MAIN3LT.INC
Utility Files
TOXLTCMP.BAT
TOXLTLNK.BAT
The TOXLT main program and subroutines
TOXLT "include" file
ISCLT2 main program modified to a subroutine entry
A TOXLT subroutine to read ISCLT2 TOXXFILE output
ISCLT2 subrountines
ISCLT2 "include" files. MAIN1LT.INC has been modified to allow
up to 80 sources per run, rather than 100 sources as originally used by
ISCLT2. If the user wishes to modify MAIN1LT.INC, see the ISC2
User's Guide Vol. I for complete instructions.
A utility file to compile TOXLT routines without linking
A utility file to link TOXLT and ISCLT2 routines
24
-------
TOXLT.LRF
README.TXT
Executable Code
TOXLT.EXE
Example Data
TEST-LT1.INP
TEST-LT1.OUT
TEST-LT1.TOX
RDU87.STR
EXAMP1.DAT
BASIC1.OUT
TEST-LT2.INP
A link response file used by TOXLTLNK.BAT
TOXLT brief infonnation ffle
A compiled and linked version of the TOXLT system, ready to
execute; developed using Version 5.1 of the Microsoft FORTRAN
Optimizing Compiler. This executable code has been compiled to run
on any PC-compatible computer, with or without a numeric
coprocessor. The system needs 640Kb conventional memory and a 40
Mb hard disk as minimum hardware requirements. This program has
been tested fully on Intel 80386 and 80486-based PC-compatibles.
An ISCLT2 input parameter file based on the sample run supplied
with the ISCLT2 package; example includes 4 pollutants, 4 stacks,
polar receptor grid, and seasonally-averaged meteorological data
Example 1 ISCLT2 output file
Example 1 ISCLT2 TOXXFILE output
Example 1 meteorological data input file; 4 season STAR summary for
Raleigh-Durham, 1987
Example 1 RISK input parameter file to be used in conjunction with
TEST-LT1.INP; 4 toxics.
Example 1 TOXLT basic table output file
Example 2 ISCLT2 input parameter file based on the example in
EPA's "A Tiered Modeling Approach for Assessing the Risks Due to
Sources of Hazardous Air Pollutants;" example includes 2 pollutants, 4
stacks, rectangular receptor grid, and annually-averaged meteorological
data
TEST-LT2.OUT Example 2 ISCLT2 output file
25
-------
TEST-LT2.TOX Example 2 ISCLT2 TOXXFILE output
LASM64.STR Example 2 meteorological data input file; annual STAR summary for
Los Angeles-Santa Monica, 1964
EXAMP2.DAT Example 2 RISK input parameter file to be used in conjunction with
TEST-LT2.INP; 2 toxics.
BASIC2.OUT Example 2 TOXLT basic table output file
The FORTRAN programs in TOXLT were developed using the Microsoft FORTRAN Optimizing
Compiler, Version 5.1.
4.2 EXECUTION PROCEDURE
The TOXLT system may be executed in either interactive or batch mode. In either case, for proper
execution, it is required that all executable TOXLT code be located in the same directory on the user's
hard disk. Input files for ISCLT2 and RISK may reside in other directories. ISCLT2 input must be
set up in advance of running TOXLT1. RISK inputs, on the other hand, may be entered manually
while running under TOXLT.
4.2.1 Interactive Execution
After downloading the executable file into a directory on the hard disk, the user enters the command
TOXLT to begin execution. The program is operated through a series of menu screens. The main
menu is shown in Figure 4-1.
1 The executable version of the TOXLT program available on the SCRAM bulletin board may
be downloaded and executed "as is" by following the directions in the README.TXT file available
on the bulletin board. Source code versions of TOXLT obtained from SCRAM must be compiled: with
the Microsoft Fortran Optimizing Compiler, Version 5.1. For further information on compiling
TOXLT source code, consult the README.TXT file.
26
-------
TOXLT System, Version 1.00
20 August 1992
Research Triangle Institute
I Please press the key to continue
A function will be activated to cause TOXLT
to pause and allow you to read TOXLT messages until
any key is pressed. You should deactivate the
function for a batch run.
Do you wish to activate function during this run [Y/n]
Do you wish to read the Introduction? (y/N): Y
figure 4-1 TOXLT main menu screens with user responses underlined
27
-------
« TOXLT Introduction » Page #1
Welcome to TOXLT, in the third tier of EPA'a Tiered
Modeling system to calculate and report receptor-
specific cancer risks and chronic non-cancer hazard
indices from all air toxics produced by a modeled
source. Sources are modeled with EPA's Industrial
Source Complex Long Term (ISCLT2) computer model to
provide annual average concentration predictions for
each source Unit cancer risks and chronic noncancer
concentration thresholds are user-provided. You enter
1. the names of ISCLT2 input and output files from a
previous or, alternatively, the current execution
of ISCLT2,
2. the name of a control parameter file previously
or, alternatively, to be created that contains:
a. TOXLT run identification,
b. the number of air toxics to be modeled,
c. the unit cancer risk, chronic noncancer
concentration threshqld, and ID of each air
toxic.
Press for more...
figure 4-1 TOXLT main menu screens with user responses underlined
28
-------
ii -.... !. ... . L. mm .,. - ! mi ..in .. 111 .. -. in .-... irt«»rT-I-
I « TOXLT Introduction » Page #2 I
I 3. for each emissions source/ a units conversion I
I factor and the amount of each air toxic as a
I mass percentage of total emissions.
Instead of the control file (2), you can make all
entries from the terminal keyboard and save the
entries to a file for later use.
For new users, there are example ISCLT2 input files
(TEST-LT1.INP and TEST-LT2.INP), and example RISK
input files (EXAMP1.DAT and EXAMP2.DAT). To get
started, enter these names when TOXLT prompts. The
examples use TOXXFILEs that contain concentrations
for a complex comprising 4 stacks, use different
averaging intervals (PERIOD and ANNUAL), and use
different example toxics. You can use any of the
output table options that RISK offers; examples of
these are available as files named OPTION[m].EX[n],
and BASICTBL.EX[n], m - 1 to 4, n - 1 to 2.
,L^^^^^^^_^__^^^ _ ^^^^ ^_ ji _, __
~ ^-^TT-^" --~4-- 4_ .). *L_W_ ««, ._..-".C Iin-IBJ-T -_-!-! -L J- T^_U-^« _ ^ _-.
Press to continue
Do you wish to read the Introduction again ? (y/N):N
Figure 4-1 TOXLT main menu screens with user responses underlined
29
-------
« TOXLT System Main Menu »
(1) Run ISCLT2 Only.
(2) Run RISK Only.
(3) Run Both ISCLT2 and RISK.
(4) or (Q) Exit.
Please select one of the options > .3,
Enter the name of the ISCLT2 input file;teat-It1.inp
Enter the name of the ISCLT2 output file;teat-It1.out
. . Calling subroutine ISCLT2 . .
+Now Processing STAR Data For WINTER
Now Processing STAR Data For SPRING
Now Processing STAR Data For SUMMER . *
Now Processing STAR Data For FALL
Now Processing WINTER Data For PERIOD Average.
Now Processing SPRING Data For PERIOD Average.
Now Processing SUMMER Data For PERIOD Average.
Now Processing FALL Data For PERIOD Average.
Figure 4-1 TOXLT main menu screens with user responses underlined
30
-------
After selecting one of the options on the main menu, additional menus appear, and the user is
requested to enter appropriate file names (including the drive and path name if necessary) for the
required ISCLT2 and/or RISK input and output files. If file names arc entered without drive/path
specifiers, files must be located in the directory from which TOXLT was invoked. TOXLT restricts
the length of ISCLT2 and RISK file names to 40 characters.
A TOXLT session continues in a sequence of steps. At each step, TOXLT checks to be sure that the
specified input files exist If a required file is not present, the user is prompted to enter a new file
name. The first step creates ISCLT2 output files (choices (1) or (3) from the main menu, Rgure 4-1).
It is here that the user enters the names of input and output files. The ISCLT2 parameter file is
required. In order for ISCLT2 to the compute dispersion estimates (concentrations), a meteorological
data file is required. Other ISCLT files such as the TOXXFILE and a permanent error message file
are named in the ISCLT input file. Subsequent steps require the RISK parameter input file (see for
example Table 3-1) and appropriate user responses. The main menu response shown in Figure 4-1 is
3, indicating that ISCLT2 in addition to RISK is to be executed. This option is selected for example
purposes because it demonstrates most of the screens and options that a user will encounter. In the
event options 1, 2, or 4 are selected, the actual-sequences a user would observe would be different but
would still be a subset of the full sequence resulting from option 3.
The user is then prompted to provide names for the ISCLT2 input file and the name of the file to
contain ISCLT2 print-out Names of any output TOXXFILEs are contained in the ISCLT2 input file.
The user is encouraged to be patient while ISCLT2 runs because execution times of 30 minutes to one
hour were experienced on a 386 machine for ISCLT2 test cases of 4 sources and 12 sources, 32
receptors in each case.
Following completion of ISCLT2, there is a sequence of screens shown in Figure 4-2 that will appear
announcing the beginning of RISK execution. Note that the user response for the name of the RISK
control input file is EXAMP1.DAT. which is described in Table 3-1. Associated with that prompt are
instructions to the effect that a blank filename, i.e., the effect of the user simply pressing the
key, will cause RISK to prompt the user to enter the data from the keyboard instead of
RISK reading the data from a file. In the event of only, the resulting sequence of prompts
will direct the user to make entries similar to those in the third column ("Example of Actual Entry in
File") of Table 3-1, and simultaneously RISK will write the keyboard entries to a file, which the user
might desire to edit and use in a subsequent session. These entries will be shown and discussed later.
31
-------
I _^ _r ^^ ^^iin^j !_ !__ -M- LI_M _ - _mmm _ _ .--«» i.. - i. -TIT f-
I « Preparing input/output files for RISK run » I
Enter name of RISK toxics input file
( Or press for keyboard entry) >exaapl.dat
** Note: RISK will create a basic table file containing all results.
Enter RISK basic table output filename > basicl.out
Calling subroutine COMPUT
Figure 4-2 TOXLT screen when Main Menu Options 1 or 3 are selected
32
-------
Figure 4-3 shows the screens that appear after the user selects table option 4 and then finally Quits to
return to the TOXLT main menu. The user responses are shown underlined. Note that output
filenames are a matter of the user's'preference; the name OPTION4.OUT, for example, indicates an
intent to use a naming convention that will indicate each file's corresponding table option. Figure 4-4
shows the return to the main menu upon entering Quit in Figure 4-3 and a user response of Q to
terminate TOXLT processing.
33
-------
(1)
(2)
(3)
(4)
« RISK OUTPUT OPTIONS »
Table Options
The risk and hazard index for each pollutant
at each receptor and for each source.
The risk and hazard index for each pollutant
at each receptor due to all sources.
The total risk and total hazard index from all
pollutants at each receptor from each source.
The total risk and total hazard index from all
pollutants at each receptor from all sources.
(0) RISK Basic Table only
(Q) Return to the main menu
Note: "risk" - lifetime cancer risk
"hazard index" - chronic noncancer hazard index
Please select one of the options"> .4
Enter RISK table output filename > option4.out
Calling subroutine COMPUT
Computing Risk
Computing Hazard
FIGURE 4-3. RISK screen for Table Option selection (user responses underlined)
34
-------
« RISK OUTPUT OPTIONS »
(1)
(2)
(3)
(4)
Table Options
The risk and hazard index for each pollutant
at each receptor and for each source.
The risk and hazard index for each pollutant
at each receptor due to all sources.
The total risk and total hazard index from all
pollutants at each receptor from each source.
The total risk and total hazard index from all
pollutants at each receptor from all sources.
(0) RISK Basic Table only
(Q) Return to the main menu
Note: "risk" » predicted cancer risk
"hazard index" - predicted noncancer hazard index!
Please select one of the -options >
« TOXLT System Main Menu »
-+
I
(1) Run ISCLT2 Only.
(2) Run RISK Only.
(3) Run Both ISCLT2 and RISK.
(4) or (Q) Exit.
Please select one of the options
*** TOXLT terminated at your request. Goodbye.
C:\
FIGURE 4-4. TOXLT screen when Table Option Q (quit) is selected and sequel to terminate.
35
-------
Figure 4-5 shows example prompts and responses that a TOXLT user encounters to create a RISK
input parameter file. This sequence occurs when a blank response has been entered for the RISK
input parameter filename in Figure 4-3 instead of "exampl.dat" as shown in that Figure. It was in fact
this sequence that created the example file EXAMP1.DAT.
36
-------
Enter name of RISK toxics input file
(Or press for keyboard entry) ~>
Enter a filename to save your entries
( Or press for no file save) > exampl.dat
Keyboard Entry
******************
Enter an identification for this RISK run (80 characters max): RISK run control information
enter number of air toxics (<21): 4
Enter Unit Cancer Risk, Chronic Noncancer Threshold, and ID of each pollutant
Pollutant number 1
Unit Cancer Risk: 8.3e-6
Chronic Noncancer Threshold: 1.0
Pollutant ID: Pollutant A
Pollutant number 2
Unit Cancer Risk: 1.3e-5
Chronic Noncancer Threshold: 1.0
Pollutant ID: Pollutant B
Pollutant number 3
Unit Cancer Risk: l.Oe-4
Chronic Noncancer Threshold: 1.0
Pollutant ID: Pollutant C
Pollutant number 4
Unit Cancer Risk: 6.8e-5
Chronic Noncancer Threshold: 1.0
Pollutant ID: Pollutant D
For each of 4 sources, enter the units conversion factor, and the
amount of each air toxic as a mass percentage of total emissions of the source.
FIGURE 4-5. Example Screen Prompts and Responses to Create a
RISK Parameter Control File Interactively
37
-------
For source number # 1, ID: 1
Units conversion factor 1
Percent of emissions for toxic Pollutant_A : 4
Percent of emissions for toxic Pollutant_B ; 2
Percent of emissions for toxic PoIlutant_C : 1.3333
Percent of emissions for toxic Pollutant_D : 1
For source number # 2, ID: 2
Units conversion factor: 1
Percent of emissions for toxic Pollutant_A : 0.1
Percent of emissions for toxic Pollutant_B : 0.1
Percent of emissions for toxic Pollutant_C : 0.1
Percent of emissions for toxic Pollutant_D : O.I
For source number # 3, ID: 3
Units conversion factor: _1_
Percent of emissions for toxic Pollutant_A . : 0
Percent of emissions for toxic Pollutant_B : 6
Percent of emissions for toxic Pollutant_C : 0
Percent of emissions for toxic Pollutant_D : 0.1
For source number # 4, ID: 4
Units conversion factor: 1
Percent of emissions for toxic Pollutant_A : 10
Percent of emissions for toxic Pollutant_B : 0
Percent of emissions for toxic Pollutant_C : 10
Percent of emissions for toxic Pollutant_D : 0
****************** gj^j Of Keyboard Entry ******************
FIGURE 4-5. Example Screen Prompts and Responses to Create a
RISK Parameter Control File Interactively
38
-------
422 Batch Execution
TOXLT can be executed as a batch job as well as being run interactively. Batch execution could be
desirable when a long ISCLT2 run is anticipated. To execute TOXLT in batch mode, the user should
enter at the PC DOS prompt a sequence similar to the following:
C:\TOXLT < RESPONSE.INP > TOXLTRUN.OUT
where RESPONSE.INP is a response file containing the equivalent user responses to the TOXLT
menu items. An example response file is shown in Table 4-1. Note that the entries in the table are
similar to the sequence of user responses in an interactive session with the exception that Line Number
2 would be a "Y" response in an interactive session. The pauses that occur between screen displays
and user prompts when executing in interactive mode are undesirable in batch mode, and for that
reason, Line Number 2 is provided to override the pauses.
39
-------
TABLE 4-1 Example TOXLT batch input file, filename RESPONSE.INP
Line
(Record)
Number
Example
of Actual
Entries in
File
Comments
8
9
10
19
20
A blank record to respond to the "press to
continue" prompt
n To respond negatively to the PAUSE (Y/N)? prompt
n To respond negatively to the Read Instructions? prompt
3 Main menu response - execute both ISCLT2 and RISK
test-Itl.inp Name of an ISCLT2 input file
test-It Lout Name of the ISCLT2 output print file
exampLdat An input data file for RISK parameters; in this case the
example shown in Table 3-1 is being referred to
basictbl.out Name of the file to receive the RISK basic table
4 Select Table Option 4
option4.out Name of the file to receive Table 4
q "Quit RISK" response
q "Exit TOXLT" to DOS
40
-------
5. TOXLT OUTPUT
5.1 GENERAL OUTPUT
Files suitable for printing ate the principal output of TOXLT. In addition to these files, users may
want to examine the ISCLT2 printout file and the TOXXFILE(s) to verify the proper operation of the
ISCLT2 model Note that all print files assume standard FORTRAN printer width of 132 characters
and format carriage control in column one.
5.2 ISCLT2 PRINTOUT FILE
Printable output files produced by the modified ISCLT2 model included in the TOXLT system are
identical in format and content to the standard ISCLT2 output as described in the ISC2 User's Guide,
Volume I. Users needing additional information about this file should refer to the User's Guide. An
example printable output file is given in Section 6.
S3 RISK PRINTOUT FILES
RISK produces printable output files that are formatted using FORTRAN carriage control characters in
column one. Examples of typical RISK outputs can be found in Chapter 6. All RISK printout files
repeat on the first page the file name information specified by the user at the input prompts. The
remaining pages of RISK printouts show the results of the risk calculations.
41
-------
6. EXAMPLE TOXLT APPLICATIONS
In this chapter we present two TOXLT applications. To date, there have been few applications of
TOXLT to actual toxic release situations. Therefore, the examples presented are somewhat artificial in
nature and only loosely based on actual release scenarios. They nevertheless serve to illustrate the
basic procedures involved in TOXLT applications. The first example is based on the ISCLT2 test case
on the EPA SCRAM bulletin board. The second example is based on the example in the EPA's "A
Tiered Modeling Approach For Assessing The Risks Due To Sources Of Hazardous Air Pollutants"
(EPA-450/4-92-001, March 1992). The ISCLT2 input data are available on the EPA SCRAM bulletin
board. The example chronic noncancer threshold concentrations in the first example were arbitrarily
chosen to be 1.0; the unit cancer risk values are actual values. The unit cancer risk data and chronic
noncancer threshold concentrations for the second example were provided by David Guinnup, EPA
OAQPS.
6.1 EXAMPLE NUMBER ONE
This is the same example used to demonstrate input data preparation in Section 3. Continuous release
of four air toxics from a complex of four co-located stacks is modeled in this example. ISCLT2 was
run using four seasons of meteorological data to generate annual ground level concentration estimates
at an array of 36 receptors located along 9 circular arcs comprising 4 receptors each. The usual rate of
1 g/s was used as the emission rate for each source. Individual source contributions are contained in
the ISCLT2 TOXXFILE specified in the input data file TEST-LT1.INP (Fig. 3-1). Data for the four
air toxics are contained in the RISK input parameter file EXAMP1.DAT, Figure 6-1.
43
-------
EXAMP1.DAT:
4
8.3e-6
1.0
Pollutant_
1.3e-5
1.0
Pollutant_
l.Oe-4
1.0
Pollutant
6.8e-5
1.0
Pollutant
1 1.0
2 1.0
3 1.0
4 1.0
RISK run control info, for 4-stack ISCLT2 example from SCRAM bboard.
number of air toxics to be modeled.
unit cancer risk, toxic A
chronic noncancer hazard threshold, toxic A
A ID of A
unit cancer risk, toxic B
chronic noncancer hazard threshold, toxic B
B ID of B
unit cancer risk, toxic C
chronic noncancer hazard threshold, toxic C
C ID of C
unit cancer risk, toxic D
chronic noncancer hazard threshold, toxic D
ID of D
1.3333 1. units conversion & % of A, B, C, and D in stack 1
1 .1 units conversion & % of A, B, C, and D in stack 2
0. 0.1 units conversion & % of A, B, C, and D in stack 3
10. 0. units conversion & % of A, B, C, and D in stack 4
D
"4.
.1
0.
10
2.
.1
0.
. 0
FXGORK 6-1 Example fl RISK input parameter file
44
-------
After creating the ISCLT2 input parameter and meteorological data files and the RISK input parameter
file, the TOXLT system is invoked, and option 3 (execute both ISCLT2 and RISK) from the main
menu (Figure 4-1) is selected. Although option 3 will cause TOXLT to branch immediately into the
RISK post-processor upon completion of the ISCLT2 run, the ISCLT2 printable output file should be
examined at some point in time to insure that the model inputs were read properly and that the model
executed as expected. For this example run, the ISCLT2 printable output file should appear as shown
in Figure 6-2.
45
-------
c
i-l
(0
H
JJ
10
a
01
s
u
ul
H TJ
O V
0 «
U fl 0
fij: 8
0>3 ""
C In C
33"
0 0
01 H
u a< 6
C §
o o
H O
JJ
a B
u e
*H O
*» -H
H JJ
TJ 14
sa
«
« «
EN ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
TH TERRAIN ( FLAGPOLES
2 > I
«*
0
Ou
ss
K
tr>
0)
EH
O U O
z as ac
«4 M M
ca H H
o
u
RURAL
jJ U O
S X *
a o u.
f" ° S.
H Z
O =) ul >
U « < W
0 a u> M
-H H M Ul
H O4 Z SH
"M Q M U
U tJ fr4 SB
W Q fid S
M o > ca
S 2 H
EH S U
O OS Cw
M Q K K
iii*
alia
Cu 04 06 H
a
u
s
ca
M
M
(U
8
M
START
8
o
a
r
-i
o
' 0
0
0 0
o
m
en
.
SO '
0
M rH
O
04
It f4
!i
(4 3
2 ca
88
0
0
o
' o
0
01
o o
o
in
en
0 0
» 0
EH 0
as o « «
M rH «> VO
O «-i M
o<
01 01 01 01
SX (H Q
SUM
M 2 x at
< & 3 3
y o M M
Q ee o o
i-l ca a o
So o o
« Ul Ul
01
o
a
r*
i-i
(-4
0
O
o
OI
o o
0
in
en
o o
V O
H o en «n
Z 0 * 41
M rH U> VJ>
2 rt rt
en en en en
Ills
S 3 3
o a M M
o a: a a
3 ca a n
8888
01
o
o
i-H
O
O
o
01
en
O 0
0
in
en o
o
o
*r a
Ei 0 en f-l
Z 0 * *
M f-4 U> VO
O 4-1 ft
Cb
» «r « »
Z I fr4 Q
° 2 S 9
O U M M
S « => =>
i-i to co a
8888
j
ij
a. a
SRCGR
FINIS
O O
ca ca
rl
4-1
4J
a
4->
3
O
.Q
!0
JJ
a
-H
-I
a
s
o
co
CD
1
05
X
M
S
n!
-------
en
H
4J
J-l
*
a
O
O
O
O
O
O
O
VO
o oooooooo
o oooooooo
oooooooo
o oooooooo
o
«
oooooooo
o
*
o
Cu O
N Oi
o
4J
-S3
.22
0) Q
°5
*:
TS M
II
O
U O
O -
&4 O
-P
a
4J
3
O
.a
HJ
.u
c
H
M
a
Csl
E-i
J
0
c*l n} (*^ 1*1 <*> ro ro
oooooooo
O O rH ^ ^ ^H pH r^ ^ »H
m
CM O
CM oooooooo
MOUHMMUCuCuCuCuU
222222222222
MOOOOOOOOOOOOS
fr^ Oj fli f&i Ot flu CU flU 04 CU 01 CU CU 0)
SaaaaaooaaaooM o
MHMMMMMMMMWMZJ:
Hoso6i»;«ia!cea:«B5o!asa:i-i o
a
U
a
ui
o
a
£
<
a
(I
a
a
« o
««X
V O<
X 1 ^
1) «
h n c
ouo
H X -H
LC 4J
M D» «
c e
^ * u
a c o
4J U *4-t
* it c
Cu * 11
ui
u
1.
Ul «
g"
O> jj
C r-l
iH 3
4-1 a-H
ui O a
01
g
U
K
d:
t-l «
£
< 4 <
*» 4J *>
000
H l-l H
cu a;
S2
CH 2
V U>
IH m
in o
o CM
CM
-------
NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE *** 09/30/92
ITH TERRAIN t FLAGPOLES *** 09:51:10
**
O
Cu
- VERSION 92273 *** *** TEST RUM
**»
.'SCLT2
^1
*
*
«
i rH
I
I
U
:S
O4
EH
J
£
Q
O
Oj
3
Cu
G OPTIONS USED: CONC RURAL ELEV
M
i
«
«
«
DEL SETUP OPTIONS SUMMARY ***
tion Values.
0 1 «
X u
1 U
*»*
etup For Calculation of Average CONCe
co
1 M
1 rH
: 1
i *
RURAL Dispersion.
0
a
rH
«
«
iradients.
.dings.
W rH
si
Regulatory DEFAULT Options:
. Final Plume Rise.
. Stack-tip Downwash.
. Buoyancy-induced Dispersion.
. Default Hind Profile Exponents.
, Default Vertical Potential Temperatl
, "Upper Bound" Values For Supersquat
, No Exponential Decay for RURAL Mode
rHCMrn^mwr-
0
a
rH
1
«
its Receptors on ELEV Terrain.
Uf
8
£
rH
«
its FLAGPOLE Receptor Heights.
8
o
<
rH
o
c >»
H a
5 g
rH a
ilates 4 STAR Average (s) for the Fol
Sea
S
3
rH
41
«
nd Annual: 0
a
Calculates PERIOD Averages.
o
rH
H
*
0
0
O
O
0
O
o
o
O rH
0 .H
0 rH
O rH O
(I a rH
X M H
4J 0 3
CMC
O M C
*z*
?£§
-IB*
a c
o o
rH «
ncludes 4 STAR Summaries for the Fol
Sea
IH
0
rH
H
Bu
<
*I
S
9
jp(s); and 36 Receptor (s)
o
u
u
eludes: 4 Source (s); 1 Source
e
M
I
3
«
ssumes A Pollutant Type of: OTH
<
rH
e
g
*
Ql
C
^
u
M
3 Continue RUNnlng After the Setup Te
£
.u
o
i/i
rH
I
«
[nput to TOXX Model (TOXXFILE Keyword)
r 1
U
0
U-l
3ns Selected:
L Outputs External File(s) of Values :
-H V
HI
0 X
4J
§.
4J
g
*
-H
4J
CO
(0
H
4J
U
(0
a
0)
l-f
H
4J
3
a
4J
3
o
ra
u
c
H
M
a
O
to
<0
(0
M
ft
4)
bi
oo
-------
u
o
o
o
o
4J
o o
«J
Gu
H
4J
05
< C
O
a
CM
E-t
J
CJ
UJ
O W 3
O (/) K
-v (3
ss§
sy
0 X
nil
D> C S
s o
H 4J
jsa
o.
c
rt 4J
3
H O
«J
-H
JJ E
I) U
o o
4J U
2
0»
H
Pa
4J -rt
-------
CM 0
cn IH
O tH
co in
cn cn
o o
* *
* *
* *
ca
cn
5
cn
u
EH
in
§
i
o
u\
L - BASED ON !
FLAGPOLES
EW ISCLT MODE]
rH TERRAIN t ]
Is
z
ct
EH
Ul
CH
tt *
« *
* *
*
CO
r-
a
oa
CO
3
co
§
M
CU
o
u
M
J
§
X
41
ft
«
CACK STACK BUILDING EMISSION RATE
co
<
ca
9
EH
CO
H
cn
,*
a
oa
EH
2
$
H
CO
VI
M
H
oa
ffl
*
z
CT VEL. DIAMETER EXISTS SCALAR VARY
4/SEC) (METERS) BY
X
M 1
1
1
P* O
x ca i
Cd Q
1
EH CO
X 06 1
(9 oa
M EH I
ca oa
X X 1
i
V) 1
>' U 1
ca EH
^3 M 1
Y El
1 (METERS) (Ml
X
(METERS)
^^
U 1
Cd
V) 1
CO 1
35
rf 1
K
O 1
i
EH in
%< '
£ g i
oa i
5 IH
(A
1
i
0
o
rH
tH
O
O
CM
CO
0
in
o
o
0
0
oa
o
o
0
0
*H
O
H
ca
»
0
CM
O
c
tH
O
O
CM
Q
0
in
CO
o
0
0
0
oa
o
o
0
0
H
o
CM
cn
ca
x
o
o
r-
o
o
o
o
o
o
ca
o
o
o
o
tH
o
cn
Cd
o
CM
O
P-
tH
O
O
CO
0
in
CO
o
o
0
CO
o
oa
o
0
o
0
tH
o
Ci
0
t
Cl
E-
It
r
4 i-
3 *
!:
o Z
1 !
a
o
CM
1
g
V
1
7
1)
m
O
%
o
M
3!
8
ca
CU
CO
o
H
as
t
0
oa
oa
CU
CO
Q
Z
« M
30
u
< oa
1 CU
ca
o
i 5
a
oa
oa
Cu
ca
Q
w
O
oa
oa
CU
CO
g
f*
M
*
>» V)
^
K
U 0
ca m
gCM
H
m cn
>»
> X
06
80
0
oa m
°
^fi
*r co
^
> X
K
O o
U o
EH
< u>
CO CO
i!
C3 O
M m
W CO
So
§o
(/)
g °i
v^
tH ca
> X
Q O
oa m
SJ
^
Si
Wl
1
Bl *
H 1
a -
.dooooooo
.00000000
00000000'
00000000
0
0
Q
tH
o
0
o
s
in
o
1 0
o
- 0
n o
d
2
a
d
3
^
ooooooooooooo
ooooooooooooo
ooooooooooooo
oooooooo. ooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
ooooooooooooo
CD tO GO CO ^0 GD CM in 10 GO 4* O in
OOOOtHtHtHCMtHOOOO
ooooooooooooo
ooooooooooooo
ooooooooooooo
»fM»r-co«
OOOOiHtHtHvHOOOOO
ooooooooooooo
ooooooooooooo
ooooooooooooo
inoinoinoinouoomoin
rofM
tHtHiHtHCMfMCMCMCM
.00000000
.00000000
,00000000
OOOOOOOO'
o
o
^*
o
0
o
0
o
o
0
o
o
o
m
CO
.00000000
.00000000
OOOOOOOO'
oooooooo
o
o
^*
o
o
o
o
CM
CM
o
o
o
o
in
r»
CO
tH
0
o
o
tH
II
Ou
cn
Cd
M
u
z
I
oa
K
Ou
0
2
ca
cn
c
H
JJ
CO
m
a
0)
H
-H
4-J
a
jj
o
H
M
a
cN
CH
J
O
iy)
H
'9.
3
x!
Id
(B
U
§
-------
m «C
o o a,
Cn
H
JJ
n
H
4J
M
«J
a
a>
H
M-J
a
4J
3
O
*
4J
c
H
M
a
CM
£1
J
O
B.
n
o
u
u
JB
c
Cu
CN
K
U
n
a
g
(0
X
w
-------
At the beginning of RISK post-processor execution, the user will be prompted to provide a name for
the basic table that is to be computed and written to a file; the creation of the table and writing it to a
file are not options in RISK. Figure 6-3 is a partial listing of the RISK basic table for Example 1.
The first few lines of text, which occur in all RISK tables, are to enable the user to establish
correspondence between the sources that were modeled in ISCLT2 and the risk factors associated with
the pollutants being modeled. Thus some consideration should be given to the naming of the ISCLT2
and RISK runs and the RISK input parameter file. The "by" statement, i.e., source by receptor angle
by receptor grid ring by pollutant, follows a convention used in statistical studies to indicate which
index (or variable) is changing faster(est) and which is slower(est). The variable named last,
"pollutant" in this case, varies fastest As seen in the table, the pollutant index changes value every
record (1, 2, 3, 4, 1, 2,...) while the first-named variable, "source," has not changed in the first 14
records of this partial listing. A "by" statement occurs in all RISK print tables. The leading integer in
Figure 6-3 is a count of the records in this file. Since there are four sources, four grid angles, nine
grid rings, and four pollutants, there are (4x4x9x4=) 576 records in this file.
52
-------
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Cancer Risk., Hazard Index, and Concentration for:
each Source by Receptor by Pollutant
Record Receptor index
Source
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
3
3
3
3
4
4
Y-grid
-1
-1
-1
-1
-1
-1
-1
-1
-2
-2
-2
-2
-3
-3
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
.OOOE-05
Pollutant
X-grid index
1.250E+02
1.250E+02
1.250E+02
1.250E+02
2.500E+02
2.500E+02
2.500E+02-
2.500E+02
4.000E+02
4.000E+02
4.000E+02
4.000E+02
8.000E+02
8.000E+02
1
2
3
4
1
2
3
4
1
2
3
4
1
2
0
0
0
0
2
1
9
4
5
4
2
1
2
2
Risk
. OOOE+00
.OOOE+00
.OOOE+00
.OOOE+00
.278E-0.9
.784E-09
.149E-09
. 666E-09
.467E-07
.281E-07
.196E-06
.120E-06
.663E-06
.085E-06
Hazard
0
0
0
0
2
1
9
6
6
3
2
1
3
1
Index
.OOOE+00
.OOOE+00
.OOOE+00
.OOOE+00
.745E-04
.372E-04
.149E-05
.862E-05
.587E-02
.293E-02
.196E-02
.647E-02
.208E-01
.604E-01
C
0
0
0
0
6
6
6
6
1
1
1
1
8
8
Concentration
OOOE+00
OOOE+00
OOOE+00
OOOE+00
862E-03
862E-03
862E-03
862E-03
647E+00
647E+00
647E+00
647E+00
8.020E+00
8.020E+00
(deleted portion)
570
571
572
573
574
575
576
4
4
4
4
4
4
4
35
35
35
36
36
36
36
1
1
1
2
2
2
2
. 600E+04
. 600E+04
.600E+04
.OOOE+04
.OOOE+04
.OOOE+04
.OOOE+04
-7.800E-04
-7.800E-04
-7.800E-04
-9.700E-04
-9.700E-04
-9.700E-04
-9.700E-04
2
3
4
1
2
3
4
0
1
0
8
0
1
0
.OOOE+00
.306E-05
.OOOE+00
.571E-07
.OOOE+00
.033E-05
.OOOE+00
0
1
0
1
0
1
0
.OOOE+00
.306E-01
.OOOE+00
.033E-01
.OOOE+00
.033E-01
.OOOE+00
1.306E+00
1.306E+00
1.306E+00
1.033E+00
1.033E+00
1.033E+00
1.033E+00
Figure 6-3 Partial Listing of a RISK Basic Table Print File
53
-------
Figures 6-4 through 6-7, which show examples of the tables obtained by RISK options one through
four, are multi-part tables. The first part is the table proper, and the following pan is the statistical, or
"Top Ten," analysis of the table. Figure 6-4 shows a partial listing of the file obtained by selection of
Table Option 1. This table shows for each pollutant the risk from each source at each receptor. The
partial listing shown is for Pollutant A. The listings for the other three pollutants are similar. The
"top ten" section of the table is, again, for Pollutant A and shows the ten receptors of highest risk
caused by each contributing source.
54
-------
c
o
H
JJ
a
o
X!
(0
CO
M
a:
e
o
H
U
I
§
*, i
c «
« 8
» m
o o
g s
00 O
in
o
i
tn
vo
I I
fid U
r-I A
m »
ro on
vo
o
u
vo
in
o\
o
o
o
o
u M
o o
o o
o
o
u
o
JJ O
<« M
^ §
r-4 Ul
(N CD
O O
O O
-t- +
ca u
o o
o o
o o
W
o
f
X
0
I
a -O
U -H
-d
* l!
s r
vo
o
ao
o
U M
in m
tn on
09
O
I
U
r-
m
on
1-4 VO V
o on
o o
+ i
IU U
O 09
o r-
O CM
vo
vo «r
vo oo
I
U
«M
CM
(M
O
o
m o
CM in
tH (M
o
o
o
o
00
o
o
o
CM
o
o
o
ti
2.
o
o
vo
o
I
ta
vo
vo
o
o
+
w
o
o
o
o
i
u
o
I
01
v
an
oo
o
o
o
o
vo
o
I
a
c-
-------
I
M
o
o
o
o
+ 00
H o o
o
o in
o 01
o
I O O
moo
m
01 o
en o
«M
I
I o o
MOO
<> .
o o
\a o
oo
-t I
I
ta
vo
m
rH
10
I
C
a
05
I o o
MOO
m
o o
p- o
o
VN CM
I
VO
o
I O O
MOO
rH
r- o
co o
i o o
MOO
vo
en o
o o
oo
H o o
^*
m o
m o
00
m i
.. -O -O
0 -H -rl
O U it
I****
I o o
MOO
rH «
00 O
in m
01
on i
O O
o o
in
CM
vo
o
I
m in
p- wi
vo
o
I
vo m
p- CM
8«H -H
U M
MOO
o
o o
o o
o
O 00
o
o
+ 00
u o o
o
o o
o o
o
o vo
MOO
o
o o
o o
o
o
+
u
o
o
.. -o -o
0 -rt *
O M M
a r T
o o
o o
oo o
m m
CM
en i
o
I O O
MOO
vo
oo m
rH CM
O
I O O
MOO
VO
m in
r- CM
o
I O O
MOO
VO .
vo m
T) T>
0 vl -r4
O M U
U (T> D>
M
U
!
m
^
.H
<0
A
.IJ
U
0
III
to
-------
5 8
rH U
O 3
a o
a _
o >, . o
a J3 «r
o
o
u
o
o
o
°i5
tJ a
c o
« u
u js
3 f
r-l C
o o
a-n
4
.. u
i£
5 S
OOOE+00
0
0
M U
O O
o o
o o
OOOE+00
0
o
o
o
u u
o o
o o
o o
a
o
O
O
o
OOOE+00
OOOE
u
0
o
H C
»
a «
88
u
u o
.. O 41
H "wo.
c x 8 e c
O 00 3O
H T) U C 2
U C
a HI > u o
O JO C -rt
a « e
0 U WO
2 * 3 M
AN i-i.fi
4 4 r-l O
H 33 O
C T3 M
C O O EH C Z HI
U M 3 X
C 06 l< 06
0 O
o - CM b
rt H frl
o
1
to
01
CM
0
1
I I
oa HI
ft CM r-l
CM (N
o o
I I
bi oa
CM vo
fH VO
in CM
CM CM
o o
I I
M U
^ vo
v en
en oo
in CM
CM CM
o o
i M
r-l CM
o
o
o
m
CM
en
in
o
o
oo
CM
o
o
CM
o
1
u
r-
n
o
CM
0
1
u
CM
o
I
00
r~
o
en en
o o
I I
b] ba
en o
CM «r
vo en
m tn
o o
I I
aa aa
r* ^"
VO IS)
r- en
0
&a
r-
m
O
U
O
1
U
en
VO
vo *r CM
00+300
o
en
C3
1
U
00
o
aa
VO
o
OOOE
m
O CM
1 O
U 1
o u
*T Cft
O VO
O
en TJ
0 4J
o o o o
I
U
CM
{S tj
2 SI
rH «T rH VO »
m <*) J3
O O 4J
I I
Cd U C
vo m -H
o en
en o a
rH r-l 3
O
o
o
o
o o
o o
V 00
o
o
o
o
o
o
o
o
o o
o o
o o
H H
in
-------
I O O
MOO
rH
Ot O
«r
in
CM
O
I o o
MOO
«
» O
ot o
01
O
I O O
u o o
at . .
01 O
m o
09
in
+ 00
woo
o '
o \n
o CM
CM
o
I O O
u o o
00
rH O
i- in
CM
P-
o
I O O
u o o
I <
M <
to
en
o
10
CM
o
o
+ 00
ta o o
o
o o
o m
CM
o
I o o
u o o
ni o
n o
01
o
I O O
a o o
r*>
rH o
o o
01
o
I O O
U o o
r-
o in
v CM
o
o
-t- o o
MOO
o
o o
o o
§
M
« o
o o
o
I O O
MOO
CM
O
I O O
MOO
rH
m o
»r m
CM
I- O
U O
o
o o
o o
00
o
rH <
O
1 O O
MOO
Ot
m in
O CM
rH
rH 1
rH
O
1 O O
MOO
Ol .
m in
0 CM
rH
rH 1
CM
O
1 O O
MOO
CD
pr| O
0 0
00 I
O.OOOE-fOO
2000.00
,00
s
-3
|
05
IM
O
Jt
c
I O O
u o o
m
oo o
o m
CM
I O
M O '
m o
rH in
> Ol
O
I O O
MOO
a* .
01 in
f CM
o
I O O
MOO
CM
on in
o CM
rH
CM
I O O
MOO
CM in
rH CM
I O O
U o o
in
CO O
o m
CM
I O O
MOO
«r «
in o
rH in
CM
rH I
O
I O O
MOO
Ot .
oi m
» CM
i o o
MOO
CM
on in
O CM
rH
Ol
?00
MOO
(*
CM m
rH CM
rH
CM I
^i
I
x
a
e
2!
-------
Figure 6-5 shows partial listings of the total risk and the total hazard from all sources at each receptor
for each pollutant The totals are, in effect, the summation over all sources in each row of Table
Option 1 in the previous Figure 6-4. The "top ten" section of this table gives listings of the receptors
of the ten highest total risks and the ten highest total hazards.
59
-------
Table Option 2:
Total Risk for each pollutant from all sources
by receptor
Pollutant number 1. Name: pollutant_A
Unit Cancer Risk: 8.300E-06
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Y-grid X-grid Total Risk from all sources
- .00 125.00 1.198E-04
*
.00 250.00 6.470E-05
.00 400.00 4.972E-05
.00 800.00 2.374E-05
.00 2000.00 9.039E-06
.00 4000.00 3.995E-06
.00 8000.00 1.638E-06
.00 16000.00 5.143E-07
.00 20000.00 3.934E-07
-125.00 .00 1.783E-04
deleted portion
8000.00 .00 3.866E-06
16000.00 .00 1.095E-06
20000.00 .00 8.657E-07
( end )
Figure 6-5 Partial listing of an example RISK Table Option 2
60
-------
Table Option 2:
Ten largest values of
total Risk for each pollutant from all sources
by receptor
Pollutant number 1. Name: pollutant_A
Unit Cancer Risk: 8.300E-06
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Average of 37 values in this table: 3.633E-05
Largest values and receptor coordinates
Rank
1
2
3
4
5
6
7
8
9
10
Y coordinate
-125. oa
125.00
.00
-250.00
250.00
.00
400.00
-400.00
.00
.00
X coordinate
.00
.00
125.00
.00
.00
-125.00
.00
.00
250.00
400.00
1.783E-04
1.753E-04
1.198E-04
9.676E-05
9.096E-05
8.874E-05
8.731E-05
7.816E-05
6.470E-05
4.972E-05
Delated portion:
risk for pollutants B, C, and D
Figure 6-5 Partial listing of an example RISK Table Option 2
61
-------
Table Option 2:
Total Hazard Index for each pollutant from all sources
by receptor
Pollutant number 1. Name: pollutant_A
Chronic Noncancer Concentration Threshold: l.OOOE+00
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Y-grid X-grid Total Risk from all sources
.00 125.00 1.443E+01
.00 250.00 7.795E+00
.00 400.00 5.990E+00
.00 800.00 2.861E+00
.00 2000.00 1.089E+00
.00 4000.00 4.813E-01
.00 8000.00 1.973E-01
.00 16000.00 6.196E-02
.00 20000.00 4.739E-02
-125.00 .00 2.148E+01
-250.00 .00 1.166E+01
deleted portion
8000.00 .00 4.657E-01
16000.00 .00 1.319E-01
20000.00 .00 1.043E-01
{ end )
figure 6-5 Partial listing of an example RISK Table Option 2
62
-------
Table Option 2:
Ten largest values of
total Hazard Index for each pollutant from all sources
by receptor
Pollutant number 1. Name: pollutant_A
Chronic Noncancer Concentration Threshold: l.OOOE+00
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Average of 37 values in this table: 4.377E+00
Largest values and receptor coordinates
Rank
1
2
3
4
5
6
7
8
9
10
Y coordinate
-125.00
125.00
.00
-250.00
250.00
.00
400.00
-400.00
.00
.00
X coordinate
.00
.00
125.00
.00
.00
-125.00
.,00
.00
250.00
400.00
2.148E+01
2.113E+01
1.443E+01
1.166E+01
1.096E+01
1.069E+01
1.052E+01
9.417E+00
7.795E+00
5.990E+00
. Deleted portion:
hazard indexes for pollutants B, C, and D
*
(end of table)
Figure 6-5 Partial listing of an example RISK Table Option 2
63
-------
While Table Options 1 and 2 in Figures 6*4 and 6-5 show risk and hazard by pollutant (i.e., for each
pollutant), the remaining tables show risk and hazard summed over all pollutants. Figure 6-6 shows a
partial listing of Table Option 3, the total risk and the total hazard from all pollutants at each receptor
from each source. For each source, the receptors having the ten largest values are shown in the "top-
ten" section of this table. The receptors are identified by their (x,y) coordinates.
64
-------
c
o
H
JJ
8-
<*
0)
rH
fr
m
0)
c
(0
1
utant
o
cu
numbe
s
u
3
O
01
m
0
ta
00
vo
o
i
u
o
1
H
CD
in
o
I
M
m
m
o
o o
M M
m r-
(M VO
V O
0
1
M
00
vo
vn
o
M
to
o
1
M
vo
o
1
M
VO
o
o o
I I
u w
in o-
O fH
to v en fH r*
3 8 i
-H 3
* O
s.
ffl
z
C
o
u
E O
O JJ
u a
3
a
c
a
o
-H
X
o
JJ
JJ M 0
*
1
JJ
O
H
g
g
JJ
9
O
04
X
o
14
I
o
M
in
o
r-
o
a
M
O
o
o
o
0
0
0
m
o
I
M
U
00
o
o
o
m
(N
0
0
m
o
I
H
m
M
m
o
fH fH in
o
M
on
o
I
M
to r-
o o
I i
M M
CM T
«r n s>
m q
on 4J
on js
o jj
I
at c
o -H
o
«r n
0
m 3
o
to
r*
in
Q "W
O O
O 0
O O>
g 2
« 0
c
f-l
W
H
10
-H
JJ
M
Oi
vo
I
vo
s
g.
H
fa
-------
o
o
+ 00
MOO
o .
o o
o o o
rH o
O O
CM
I
O
o
H- O O
MOO
O
o m
a\ o CM
in
o
I o o
MOO
m
01 o
rH O
in
o
I O O
MOO
c» v,
in
CM
vo
o
I O O
MOO
«> . .
01 O
VO O
00
VO
o
I O O
MOO
m
in o
o in
01
o
1 0 0
U 0 0
(M
0^*
0
1 0 0
MOO
oo
>n o
n m
01
o
rH M
O> C/l
1 g
CM M
s *
rH 1
g §
i 2
» !
A
rH
rH M
M "2
°8&
n u o
O VH «
3 U
rH J<
J B >,
> r} -Q
c*
rH
4J «
_ W
a o
O 41
H
O O U)
vw MM
« rJ
«! O
O CO Qi
o
00 O
V
in
vo
o
I O O
MOO
01 . .
VO O
CM
VO
o
1 O O
MOO
o
^- m
CO CM
VO
O
1 0 0
MOO
O
CN in
CA o in
(M fM
m
o
I o o
WOO
v
o in
en CN
.. -o -o
84 -H
M M
b D> D>
CO
0
H
4->
8-
JO
<0
El
CO
0)
.H
*
0)
W
0
C
-,H
H
4.J
Oi
vt>
-------
c
o
r-l
4J
a
o
£1
ID
EH
CO
H
OS
0)
rH
I
(0
0>
c
utanta
o
a
O
Of
I
§ i
9 Z
O 01
M M
(A 13
SO
0<
1 5
J Cv.
CD
Q vl
858E
9E-02
E+
02
964E
6E
72E-02
o
o
+
H
m
VO
VO
eg
o
&
m
to
O rH
O O
H M
<0 CM
in en
rH in
eg en
o o
i i
jvj m
o o
I I
U Cd
r- r-
O CM
en CM
en rH
o
I
o
i
CM
O
1
Cd
U
in
o
rH
O
1
M
VO
rH
r**
rH
O
1
u
p*
CO
o
rH
O
$
t
en
rH
O
1
u
en
rH
CM
O
Cd
in
fH
en
CM
o
1
o
en
o
1
U
m
CO
en
o
Cd
in
o
I
Cd
r-
eo
o
o
e T> w
a n <
c o .
O O rH
-H w u 2
*J C -H to H
c
o
S
t
-I O * S
H vw M Cd EH
0 -H Ol C 2 rH
A 4J VH 3 X
1 C « U tt!
30 O
o C -Q eg CD
U fH H K
a
«
iJ
I
rl
T3
O -H
4J
CM
o
U
vo
i
O
o » «
o
o
0
0
0
o
o
Cd
CO
a
o
o
VO
o
Cd Cd
en o
r- en
r~ CM
vo i
o o
I I
Cd Cd
en r-
vo en
r- in
o
i
Cd
in
en
CM
rH in T
O
o
0
0
o
o
o
0
r
X
2 «
" t,
vw D>
O I
X
m
CM
0
0
m
CM
o
o
CO
o o
o o
o o
eg v
0
0
o
o
o
0
0
0
o
a>
o
o
o
o
o
VO
O
o
o
o
o
o
eg
§
ti
O
1
M
CM
0
i
CO
rH
m
O
ta
CM
CM
VO
o
I
O
o
o
o
o
o
o
VO
u
in
O rH
I O
Cd I
o Cd
^ oo
O rH
o
I
ta
O 4J
I
Cd C
en -H
rH
en erj
V
o
o
O VH
O O
O 91
o eg
O M
eg 0
>
H
(0
H
4J
M
(0
Cu
V0
Eu
-------
o
o
+ 00
MOO
o
0
o
O
1 O O
MOO
CO
1- 0
mo
V
CM
CM
o
1 0 0
Moo
at
CM 0
mo
oo
m
o
+ 00
MOO
to >
CO O
fH O
o
o
+ 00
Woo
o
o in
O CM
00
o
0 0
OO
0
m
CM
CM
o
1 0 0
MOO
vo
01
o
in
CM
O
+ 00
MOO
«r a
in m
CM
U
ro
C:
O
41
0
0
fH
1
IM
O
a
0
3
*H
C
0
*»
&
H
a
u
c
4J
3
H
rH
*H
1
O
H
X
0
O
C
H
TJ
U
N
*
>H
41
0
4J
by source
^4
o
4J
Of
3
o
Ll
>,
S
i-f
4J
*J
U
H
KM
H
C
2
e
2
3
M
OS
control info, for 4-stack ISCLT2 ex.
c
3
Ul
M
OS
g
r-t
2
H
S
H
4J
-H
4J
C
0
e
2
CM
Jj
M
§
W
64
CLT MODEL - BASED ON SCRAM BBS TEST 1
RRAIN t FLAGPOLES
(0 M
M H
S 3-
SB M
«*
£
z
a
us
s
H
£
o
rH
f
X
0
0
fH
H
pi
gl f
X X
O
1 0 0
U 0 0
in f
CM 0
r- o
«tr
CO 1
O
1 O O
MOO
in
to o
fH o
O
1 O O
MOO
co
CM
m
CM
0
I o o
MOO
o
V 0
co m
CM
O
1 0 O
MOO
r»
fH in
I CM
fH
m
o
I O O
MOO
r- . f
to in
m CM
o
I O O
TOO
X
C CO
1
8!
o in
m CM
T> T>
0 -H -I
O U H
*4 Ot tfl
Sii
CM
o
1 0 O
U 0 0
o m
v CM
CM
o
1 0 0
MOO
iH *
in o
«r in
CM
r-
CM
O
1 O O
MOO
CO
n o
o o
CO 1
CM
o
1 0 0
H O 0
to .
r~ o
in o
CM
0
\ 0 0
MOO
00
vo o
f* m
CM
00 1
CM
O
I O O
MOO
at '
r- m
oo CM
o
I O O
MOO
o
o in
CO CM
o
I O O
MOO
at i
m m
«r CM
H i
8-4 -rt
U h
c co
ca
05
O
+ OO
MOO
in f
to o
oo o
f V
fH I
O O
o o
00 O
o o
o
+ 00
Moo
o
-f O O
MOO
o
r~ o
H m
CM
CM
o
H- O O
MOO
at . f
o o
co in
01
CM I
o
-t- o o
MOO
CO
in in
co CM
fH
-------
Table Option 4 shown in Figure 6-7 differs from the other three options in that it comprises three
sections instead of two. The first section is, in essence, simply the row sums of the previous table,
Option 3, Fig. 6-6, and shows at each receptor the total risk and the total hazard from all pollutants
and all sources. The second section, the "top-ten" receptors section, shows total risk and total hazard
with the individual source contributions broken out The third section breaks out the risk and hazard
even further by showing the individual pollutant contributions. This table presents the most detailed
information of all the tables about the causes, or sources, of risk and hazard at the ten most adverse
receptors in a grid network. This table represents the analysis prescribed in tier 3 analyses in the
EPA's "A Tiered Modeling Approach For Assessing The Risks Due To Sources Of Hazardous Air
Pollutants".
69
-------
Table Option 4:
Total Risk at each receptor from all pollutants and all sources
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Y-grid X-grid Total Risk
.00 125.00 1.581E-03
.00 250.00 8.545E-04
.00 400.00 6.571E-04
.00 800.00 3.139E-04
.00 2000.00 1.195E-04
.00 4000.00 5.283E-05
.00 8000.00 2.166E-05
.00 16000.00 6.802E-06
.00 20000.00 5.203E-06
-125.00 .00 2.354E-03
-250.00 .00 1.278E-03
deleted portion
16000.00 .00 1.448E-05
20000.00 .00 1.145E-05
(end)
rigur* 6-7 Partial listing of an example RISK Table Option 4
70
-------
Table Option 4:
Total Risk at each Top Ten receptor from all pollutants and all sources:
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exarapl.dat
- Source Contributions -
Y-grid X-grid Total Risk 1234
-125.00 .00 2.354E-03 6.133E-09 4.027E-05 9.920E-06 2.304E-03
125.00 .00 2.314E-03 6.028E-09 3.960E-05 8.840E-06 2.265E-03
.00 125.00 1.581E-03 O.OOOE+00 2.705E-05 6.717E-06 1.548E-03
-250.00 .00 1.278E-03 3.329E-09 2.185E-05 5.962E-06 1.250E-03
250.00 .00 1.201E-03 3.128E-09 2.054E-05 5.067E-06 1.175E-03
.00 -125.00 1.171E-03 3.050E-09 2.004E-05 4.357E-06 1.146E-03
400.00 .00 1.153E-03 3.005E-09 1.971E-05 5.832E-06 1.128E-03
-400.00 .00 1.033E-03 2.691E-09 1.763E-05 5.466E-06 1.010E-03
.00 250.00 8.545E-04 4.593E-11 1.461E-05 4.055E-06 8.358E-04
.00 400.00 6.571E-04 1.057E-11 1.125E-05 3.517E-06 6.423E-04
rigur« 6-7 Partial listing of an example RISK Table Option 4
71
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Total Risk at this receptor, rank: 1
Y-grid X-grid Total Risk
-125\00 " .00 2.354E-03
- Source Contributions -
Pollutant 1 2* 3 4
pollutant_A 7.815E-10 1.766E-06 O.OOOE+00 1.766E-04
pollutant_B 6.120E-10 2.765E-06 O.OOOE+00 O.OOOE+00
pollutant_C 3.138E-09 2.127E-05 O.OOOE+00 2.127E-03
pollutant_D 1.601E-09 1.446E-05 9.920E-06 O.OOOE+00
rigur* 6-7 Partial listing of an example RISK Table Option 4
72
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
BXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Total Risk at this receptor, rank: 2
Y-grid X-grid Total Risk
125.00 .00 2.314E-03
- Source Contributions -
Pollutant 1234
pollutant_A 7.682E-10 1.736E-06 O.OOOE+00 1.736E-04
pollutant_B 6.016E-10 2.719E-06 O.OOOE+00 O.OOOE+00
pollutant_C 3.085E-09 2.092E-05 O.OOOE+00 2.092E-03
pollutant_D 1.573E-09 1.422E-05 8.840E-06 O.OOOE+00
. deleted portion; tables for ranks 3 through 10 of Risk
Figure 6-7 Partial listing of an example RISK Table Option 4
73
-------
Table Option 4:
Total Hazard Index at each receptor from all pollutants and all sources
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Y-grid X-grid Total Risk
.00 125.00 3.003E+01
.00 250.00 1.623E+01
.00 400.00 1.248E+01
*
.00 800.00 5.960E+00
.00 2000.00 2.269E+00
.00 4000.00 1.003E+00
.00 8000,00 4.112E-01
.00 16000.00 1.291E-01
.00 20000.00 9.876E-02
-125.00 .00 4.470E+01
-250.00 .00 2.427E+01
-400.00 .00 1.961E+01
-800.00 .00 9.616E+00
-2000.00 .00 3.747E+00
deleted portion
16000.00 .00 2.749E-01
20000.00 .00 2.173E-01
(end)
Figure 6-7 Partial listing of an example RISK Table Option 4
74
-------
Table Option 4:
Total Hazard Index at each Top Ten receptor from all pollutants and all
sources
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
- Source Contributions -
Y-grid X-grid Total Hazard 1234
-125.00 .00 4.470E+01 3.725E+00 8.509E-01 1.459E-01 4.254E+01
125.00 .00 4.395E+01 3.662E+00 8.367E-01 1.300E-01 4.183E+01
.00 125.00 3.003E+01 O.OOOE+00 5.716E-01 9.879E-02 2.858E+01
-250.00 .00 2.427E+01 2.022E+00 4.617E-01 8.768E-02 2.309E+01
250.00 .00 2.280E+01 1.900E+00 4.340E-01 7.451E-02 2.170E+01
.00 -125.00 2.224E+01 1.853E+00 4.234E-01 6.407E-02 2.117E+01
400.00 .00 2.190E+01 1.825E+00 4.165E-01 8.576E-02 2.083E+01
-400.00 .00 1.961E+01 1.634E+00 3.725E-01 8.038E-02 1.865E+01
.00 250.00 1.623E+01 3.104E-02 3.087E-01 5.964E-02 1.544E+01
.00 400.00 1.248E+01 4.970E-03 2.378E-01 5.172E-02 1.186E+01
Figur* 6-7 Partial listing of an example RISK Table Option 4
75
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Total Hazard Index at this receptor, rank: 1
Y-grid X-grid Total Hazard Index
-125.00 .00 4.470E+01
- Source Contributions -
Pollutant 1234
pollutant_A 1.788E+00 2.127E-01 O.OOOE+00 2.127E+01
pollutant_B 8.941E-01 2.127E-01 O.OOOE+00 O.OOOE+00
pollutant_C 5.960E-01 2.127E-01 O.OOOE+00 2.127E+01
pollutant_D 4.470E-01 2.127E-01 1.459E-01 O.OOOE+00
rigur* 6-7 Partial listing of an example RISK Table Option 4
76
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP1.DAT: RISK run control info, for 4-stack ISCLT2 example from SCRAM
bboard.
From ISCLT2 run entitled:
TEST RUN FOR NEW ISCLT MODEL - BASED ON SCRAM BBS TEST CASE
WITH TERRAIN & FLAGPOLES
Name of RISK toxics input file: exampl.dat
Total Hazard Index at this receptor, rank: 2
Y-grid X-grid Total Hazard Index
125.00 .00 4.395E+01
- Stource Contributions -
Pollutant 1234
pollutant_A 1.758E+00 2.092E-01 O.OOOE+00 2.092E+01
pollutant_B 8.789E-01 2.092E-01 O.OOOE+00 O.OOOE+00
pollutant_C 5.859E-01 2.092E-01 O.OOOE+00 2.092E+01
pollutant_D 4.395E-01 2.092E-01 1.300E-01 O.OOOE+00
deleted portion; rankings 3 through 10 for Hazard Index
Figure 6-7 Partial listing of an example RISK Table Option 4.
77
-------
63 EXAMPLE NUMBER TWO
The second example of TOXLT application illustrates the culmination of sucessively higher degrees of
modeling refinement addressed in EPA's tiered modeling guidance. Figure 6-8 shows the input file
used for the initial step, execution of ISCLT2. Four sources, two pollutants, and a rectangular grid, as
opposed to a polar grid, are the major differences between this example and Example 1.
78
-------
** This is an example input for the ISC2 Long Term Model, ISCLT2. It follows
** the example facility described in "A Tiered Modeling Approach for Assessing
** the Risks Due to Sources of Hazardous Air Pollutants", (EPA-450/4-92-001,
** March 1992)
** The example data were developed to support TOXLT but can also be used with
** ISCLT2.
CO STARTING
TITLEONE
TITLETWO
errorfil
MODELOPT
AVERTIME
TERRHGTS
*» FLAGPOLE
POLLUTID
RUNORNOT
ELEVUNIT
CO FINISHED
SO STARTING
** location
SO LOCATION
TEST RUN FOR NEW TOXLT MODEL - BASED ON
RAMMET-processed met data from LA/Santa
errormsg.out
DFAULT CONC urban
annual
flat
OTH
run
FEET
Srcid Srctyp Xs Ys
sourcl POINT 35.0 .0
TIERED MODELING TEST CASE
Monica, 4 sources, 2 pollut
[ZsJ
.0
** parameters Srcid gm/sec Stkhgt(m) Stktmp(K) Stkvel(m/s) stkdiam(m)
SO SRCPARAM sourcl 1. 40.00 303.00 5.60 0.5
SO LOCATION sourc2 POINT 5.0 . -0 .0
SO SRCPARAM sourc2 1. 20.00 313.00 1.04 0.1
SO LOCATION sourc3 POINT .0 5.0 .0
SO SRCPARAM sourc3 1. 10.00 303.00 0.54 0.15
SO LOCATION sourc4 POINT .0 5.0 .0
SO SRCPARAM sourc4 1. 10.00 313.00 0.75 0.15
so srcgroup all
SO FINISHED
** The receptor grid is from lowerleft (-250,-250) to upperright (250,250) but
** the facility is inside this grid, from (-100,-100) to (100,100) and we
** want no receptors inside the fence line (they will be the maximum values -
** we want to see the maximum values that are outside the fence,
** i.e. non-employees). So, there are 4 rectangles that describe the receptor
*» grid:
RE STARTING
** From (x,y) to (x,y)
**1 (-250,-250)(-100,250)-250 -200 -150 -100 I -250 -200 -150 -100 -50 0 ditto
RE GRIDCART CAR1 STA
CAR1 XYINC -250. 4 50. -250. 11 50.
RE GRIDCART CARl END
*«2 (-50,-250) (50,-100) -50 0 50 I -250 -200 -150 -100
RE GRIDCART CAR2 STA
CAR2 XYINC -50. 3 50. -250. 4 50.
RE GRIDCART CAR2 END
**3 (-50,100) (50,250) -50 0 50 I 100 150 200 250
RE GRIDCART CAR3 STA
CAR3 XYINC -50. 3 50. 100. 4 50.
RE GRIDCART CAR3 END
**4 (100,-100)(250,250) 100 150 200 250 I -250 -200 -150 -100 -50 0-> rpt.
RE GRIDCART CAR4 STA
CAR4 XYINC 100. 4 50. -250. 11 50.
RE GRIDCART CAR4 END
RE FINISHED
6-8 Example ISCLT2 input, Cartesian grid, Example 2, Tiered Modeling
79
-------
ME STARTING
INPUTFIL iasm64.str FREE
ANEMHGHT 10.
SURFDATA 23174 1964 LA
UAIRDATA 93197 1964 SANTA_MOMICA
STARDATA annual ~
no echo
*»
**
**
**
**
- AMBIENT AIR TEMPERATURE (DEGREES KELVIN) -
STAB
CAT 1
STAB
CAT 2
STAB
CAT 3
STAB
CAT 4
STAB
CAT 5
STAB
CAT 6
AVETEMPS annual
283.0 283.0 283.0 283.0 283.0 283.0
- MIXING LAYER HEIGHT (METERS) -
**
**
**
**
ME
AVEMIXHT
AVEMIXHT
AVEMIXHT
AVEMIXHT
AVEMIXHT
AVEMIXHT
FINISHED
SEAS
annual
annual
annual
annual
annual
annual
S
T
A
1
2
3
4
5
6
WS
CAT 1
.225E+04
.150E+04
.150E+04
.100E+04
.500E+03
.500E+03
WS
CAT 2
.225E+04
.150E+04
.150E+04
'.100E+04
.SOOE+03
.500E+03
WS
CAT 3
.225E+04
.150E+04
.150E+04
.100E+04
. 500E+03
.500E+03
WS
CAT 4
.225E+04
.1SOE>04
.150E+04
.100E+04
.,500E+03
."500E+03
WS
CAT 5
.225E+04
.1SOE+04
.150E+04
.100E+04
.500E+03
.SOOE-t-03
WS
CAT 6
.22SE+04
.150E+04
.150E+04
.100E+04
.SOOE-t-03
.500E+03
OU STARTING
TOXXFILE annual
OU FINISHED
all teat-lt2.tex <« Tho TOXXFILS definition
Vigux* 6-8 Example ISCLT2 input, Cartesian grid, Example 2, Tiered Modeling
-------
Figure 6-9 is a partial listing of the TOXXFBLE produced by ISCLT2 for this example. While the file
has been reduced to about one fourth its original size, the source/receptor locations which lead to the
maximum annual off-site concentrations for each of the source/pollutant combinations have been
retained and highlighted in italics. The letters X, Y, and Z correspond to the notation used in the
Tiered Modeling example to identify these particular receptors. ISCLT2 output alone cannot predict
source/pollutant concentrations, of course; it was necessary to exercise the RISK post-processor for the
case of the two toxics whose unit cancer risks and chronic noncancer concentration thresholds are
given in the RISK input parameter file shown in Figure 6-10.
81
-------
* ISCLT2 (92273) : TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING
TEST CASE
* MODELING OPTIONS USED:
* CONG URBAN FLAT DFAULT
TOXXFILE OF ANNUAL VALUES FOR SOURCE GROUP: ALL
* FOR A TOTAL OF 112 RECEPTORS.
* ITAB - 0; NXTOX - 4; NYTOX - 11
* FORMAT: (2 (1X,F13.5) , IX, F14.6, 1X,F8.2,2X,A6,2X,A8)
X Y CONG ZELEV AVE SOURCE
*
-250
-200
-150
-100
-250
-200
-150
-100
.00000
.00000
.00000
.00000
.00000
.00000
.00000
.00000
-250
-250
-250
-250
-200
-200
-200
-200
.00000
.00000
.00000
.00000
.00000
.00000
.00000
.00000
.331848
.337811
.412121
.496711
.433993
.423794
.425317
.519208
.00
.00
.00
.00
.00
.00
.00
.,.00
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
^ANNUAL
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
deleted portion
100.00000
150.00000
200.00000
250.00000
100.00000
X » 150.00000
200.00000
250.00000
100.00000
150.00000
deleted portion
100.00000
150.00000
200.00000
250.00000
Y >»100. 00000
150.00000
200.00000
250.00000
100.00000
150.00000
deleted portion
50.00000
50.00000
50.00000
50.00000
100.00000
100.00000
100.00000
100.00000
150.00000
150.00000
.00000
.00000
.00000
.00000
50.00000
50.00000
50.00000
50.00000
100.00000
100.00000
200.00000
250.00000
-100.00000
-100.00000
.613338
1.606743
1.757628
1.617165
.947600
1.875939
1.832422
1.613642
.731497
1.525235
8.703256
8.145411
7.066730
5.849576
9.058412
7.364129
6.223742
5.201357
8.420076
7.046633
7.772796
5.856500
00
00
00
00
00
00
00
00
00
00
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
SOURC1
,00 ANNUAL
.00 ANNUAL
.00 ANNUAL
.00 ANNUAL
,00 ANNUAL
,00 ANNUAL
.00 ANNUAL
.00 ANNUAL
.00 ANNUAL
.00 ANNUAL
SOURC2
SOURC2
SOURC2
SOURC2
SOURC2
SOURC2
SOURC2
SOURC2
SOURC2
SOURC2
.00 ANNUAL SOURC3
.00 ANNUAL SOURC3
Figure 6-10 Partial listing of a TOXXFILE, Tiered Modeling
»
82
-------
100.00000
150.00000
200.00000
250.00000
Z >»100. 00000
150.00000
200.00000
250.00000
100.00000
deleted portion
100.00000
150.00000
200.00000
250.00000
(end of the table)
-50.00000
-50.00000
-50.00000
-50.00000
.00000
.00000
.00000
.00000
50.00000
250.00000
250.00000
250.00000
250.00000
19.128920
13.843340
10.632010
8.136520
30.496410
20.952240
14.316360
10.210410
25.148780
3.153823
4.567720
5.159671
5.112795
00
00
00
00
00
00
00
00
00
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
ANNUAL
SOURC3
SOURC3
SOURC3
SOURC3
SOURC3
SOURC3
SOURC3
SOURC3
SOURC3
,00 ANNUAL SOURC4
.00 ANNUAL SOURC4
.00 ANNUAL SOURC4
.00 ANNUAL SOURC4
Figure 6-10 Partial listing of a TOXXF1LE, Tiered Modeling
83
-------
EXAMP2.DAT RISK toxic run control info Tiered Modeling Guidance, test-lt2.inp
2 number of air toxics to be modeled.
l.Oe-7 unit cancer risk, toxic A
20.0 chronic noncancer concentration threshold, toxic A
POLLUTANTJV ID of A
2.Oe-7 unit cancer risk, toxic B
5.0 chronic noncancer concentration threshold, toxic B
POLLUTANT_B ID of B
1 1.0 42. 0. units conversion & percent of A, and B in stack 1
2 1.0 3.5 1.5 units conversion & percent of A, and B in stack 2
3 1.0 0. 0.565 units conversion & percent of A, and B in stack 3
4 1.0 0.3.4 units conversion & percent of A, and B in stack 4
rigur* 6-10 RISK input parameter file, Tiered Modeling example
84
-------
Note in Fig. 10 that pollutant B is not in the emissions of stack 1, and A is not in the emissions of
stacks 3 and 4. The effects of these "zero pollutant" emission rates ate readily noticeable in Table
Option #4 as shown in Fig. 6-11, which gives the pollutant and source contributions to the receptors of
maximum risks and hazards. For brevity, only the two top ranked receptors are presented.
85
-------
Table Option 4:
Total Risk at each receptor from all pollutants and all sources
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
Y-grid X-grid Total Risk
-250.00 -250.00 1.101E-08
-250.00 -200.00 1.447E-08
-250.00 -150.00 1.892E-08 " "
-250.00 -100.00 2.630E-08
-200.00 -250.00 1.568E-08
deleted portion
250.00 100.00 3.764E-08
250.00 150.00 5.355E-08
250.00 200.00 6.186E-08
250.00 250.00 6.276E-08
(end)
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
86
-------
Table Option 4:
Total Risk at each Top Ten receptor from all pollutants and all sources:
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
- Source Contributions -
Y-grid X-grid Total Risk 1234
.00 100.00 2.861E-07 1.202E-14 5.657E-08 3.446E-08 1.951E-07
-100.00 .00 2.815E-07 1/182E-14 5.457E-08 3.373E-08 1.932E-07
50.00 100.00 2.505E-07 1.052E-14 5.888E-08 2.842E-08 1.632E-07
100.00 100.00 2.221E-07 9.329E-15 5.473E-08 2.463E-08 1.428E-07
.00 150.00 2.134E-07 8.964E-15 5.295E-08 2.368E-08 1.368E-07
-150.00 .00 1.988E-07 8.348E-15 4.997E-08 2.182E-08 1.270E-07
-50.00 100.00 1.871E-07 7.856E-15 4.127E-08 2.162E-08 1.242E-07
50.00 150.00 1.819E-07 7.640E-15 4.787E-08 1.969E-08 1.144E-07
-100.00 50.00 1.810E-07 7.600E-15 4.216E-08 2.051E-08 1.183E-07
100.00 .00 1.689E-07 7.095E-15 3.178E-08 2.045E-08 1.167E-07
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
87
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
Total Risk at this receptor, rank: 1
Y-grid X-grid Total Risk
.00 100.00 2.861E-07
- Source Contributions -
Pollutant 1 -2* 3 4
POLLUTANT_A 1.202E-14 3.046E-08 O.OOOE+00 O.OOOE+00
POLLUTANT B O.OOOE+00 2.611E-08 3.446E-08 1.951E-07
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
88
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
Total Risk at this receptor, rank: 2
Y-grid X-grid Total Risk
-100.00 .00 2.815E-07
.
- Source Contributions -
Pollutant 1234
POLLUTANT_A 1.182E-14 2.939E-08 O.OOOE+00 O.OOOE+00
POLLUTANT_B O.OOOE+00 2.519E-08 3.373E-08 1.932E-07
deleted portion, Total Risk, Ranks 3 through 10
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
89
-------
Table Option 4:
Total Hazard Index at each receptor from all pollutants and all sources
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP2.DAT RISK toxic run control info. Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
Y-grid X-grid Total Hazard Index
-250.00 -250.00 9.896E-03
-250.00 -200.00 1.306E-02
-250.00 -150.00 1.710E-02
-250.00 -100.00 2.401E-02
-200.00 -250.00 1.410E-02
deleted portion
250.00 100.00 3.425E-02
250.00 150.00 4.890E-02
250.00 200.00 5.624E-02
250.00 250.00 5.679E-02
(end)
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
90
-------
Table Option 4:
Total Hazard Index at each Top Ten receptor from all pollutants and all
sources
Pollutant number 0. Name: All Pollutants
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL r BASED ON TIERED MODELING TEST CASE
RAMMET-precessed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
- Source Contributions -
Y-grid X-grid Total Hazard 1 2 3 4
.00 100.00 2.709E-01 5.689E-03 4.134E-02 3.446E-02 1.951E-01
-100.00 .00 2.668E-01 5.603E-03 3.988E-02 3.373E-02 1.932E-01
50.00 100.00 2.347E-01 4.928E-03 4.303E-02 2.842E-02 1.632E-01
100.00 100.00 2.074E-01 4.355E-03 4.000E-02 2.463E-02 1.428E-01
.00 150.00 1.992E-01 4.183E-03 3.869E-02 2.368E-02 1.368E-01
-150.00 .00 1.853E-01 3.892E-03 3.652E-02 2.182E-02 1.270E-01
-50.00 100.00 1.759E-01 3.695E-03 3.016E-02"2.162E-02 1.242E-01
-100.00 50.00 1.696E-01 3.562E-03 3.081E-02 2.051E-02 1.183E-01
50.00 150.00 1.690E-01 3.550E-03 3.498E-02 1.969E-02 1.144E-01
100.00 .00 1.604E-01 3.368E-03 2.322E-02 2.045E-02 1.167E-01
figure 6-11 Partial Listing of RISK Table Option 4, Example #2
91
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
Total Hazard Index at this receptor, rank: 1
Y-grid X-grid Total Hazard Index
.00 100.00 2.709E-01
- Source Contributions -
Pollutant 1234
POLLUTANT_A 5.689E-03 1.523E-02 O.OOOE+00 O.OOOE+00
POLLUTANT B O.OOOE+00 2.611E-02 3.446E-02 1.951E-01
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
92
-------
Table Option 4:
The receptors of the ten largest values; contributing pollutants and sources
RISK run identification:
EXAMP2.DAT RISK toxic run control info, Tiered Modeling Guidance,
test-lt2.inp
From ISCLT2 run entitled:
TEST RUN FOR NEW TOXLT MODEL - BASED ON TIERED MODELING TEST CASE
RAMMET-processed met data from LA/Santa Monica,4 sources, 2 pollut
Name of RISK toxics input file: examp2.dat
Total Hazard Index at this receptor, rank: 2
Y-grid X-grid Total Hazard Index
-100.00 .00 2.668E-01
- Source Contributions -
Pollutant 1234
POLLUTANT_A 5.603E-03 1.469E-02 O.OOOE+00 O.OOOE+00
POLLUTANT_B O.OOOE+00 2.519E-02 3.373E-02 1.932E-01
deleted portion, Total Hazards, Ranks 3 through 10
(end)
Figure 6-11 Partial Listing of RISK Table Option 4, Example #2
93
-------
TECHNICAL REPORT DATA
(Please read Instructions on reverse before completing)
1. REPORT NO. 2.
EPA-450/4-92-003
4. TIUE AND SUBTITLE
Toxic Modeling System Long-Term (TOXLT)
User's Guide
7. AUTHORfS)
9. PERFORMING ORGANIZATION NAME AND ADDRESS
Research Triangle Institute
Post Office Box 12194
Research Triangle Park, NC 27709-2194
12. SPONSORING AGENCY NAME AND ADDRESS
U. S. Environmental Protection Agency
Office of Air Quality Planning and Standards
Technical Support Division
Research Triangle Park, NC 2771 1
3. RECIPIENTS ACCESSION NO.
5. REPORT DATE
November 1992
8. PERFORMING ORGANIZATION CODE
& PERFORMING ORGANIZATION REPORT NO.
10. PROGRAM ELEMENT NO.
11. CONTRACT/GRANT NO.
Purchase Order No. 2D1482NALX
13. TYPE OF REPORT AND PERIOD COVERED
14. SPONSORING AGENCY CODE
15. SUPPLEMENTARY NOTES
16. ABSTRACT
This document describes the Toxic Modeling System Long-Term (TOXLT) and provides instructions on its
implementation. TOXLT is a personal-computer-based model that has been developed in conjunction with the
release of the new version of the EPA's Industrial Source Complex Dispersion Models (EPA, 1992) and the
promulgation of the EPA's "A Tiered Modeling Approach for Assessing the Risks Due to Sources of Hazardous Air
Pollutants" (EPA-450/4-92-001). The purpose of TOXLT is to assist in the evaluation of the lifetime cancer risks and
chronic noncancer hazards that may result from long-term exposure to air pollutants.
17. KEY WORDS AND DOCUMENT ANALYSIS
a. DESCRPTORS
Air Pollution
Atmospheric Dispersion Modeling
Air Toxics
Risk Assessment
18. DISTRIBUTION STATEMENT
Release Unlimited
b. IDENTIFIERS/OPEN ENDED TERMS
1ft SECUHfTY CLASS (Stapor^
Unclassified
20. SECUBflY CLASS
-------
------- |