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COMPASS-EI–Manual – Chapter 4

Page

CHAPTER 4: CONTAMINANT MAINTENANCE

4.1 About Contaminant Maintenance

Contaminant Maintenance

is accessed by a menu selection under the

File

menu item at the top,

left corner of the

C&C

screen. This feature allows users to edit the Contaminant information (not

emissions!) to make using the program more convenient. All headings on the display screen may
be used as sort keys simply by clicking on the

heading

to sort the list. To reduce the number of

items shown in the list, users can enter all or part of the

Contaminant Code

Contaminant Name

CAS Number

next to the filter line located near the top of the screen. The appropriate filter key

should also be selected to identify whether the information entered by the user relates to a
Contaminant Code, Contaminant Name, or CAS Number. If, for example, you wish to see all
contaminants with a name beginning with “ETHYL,” then the appropriate filter key selection
would be

Contaminant Name like

. Then type ETHYL in the blank to the right. The list may also

be filtered by

Criteria Pollutant Category

by making a selection from the Category filter

dropdown list.

There are five different editing functions that users may perform in Contaminants Maintenance,
as explained in the following paragraphs:

1. If emissions will be copied into the EI from an external database or spreadsheet, or from

the COMPASS-Calcs module, the COMPASS-Pipeline module provided by PDC Corp
will expect each Contaminant Code to be associated with the CAS Number under which
the emissions have been calculated and stored in the data table. This linking is only
required for users that will use the Pipeline module. Only emissions for which the CAS
Number and Contaminant Code have been associated will be copied to the EI emissions
database.

In COMPASS-Calcs, to link Contaminants with CAS Numbers, click on the

CASNo

field

and either enter the correct CAS Number, or double-click on this field to view CAS
Numbers that appear in the COMPASS-Calcs module. In cases where there is an exact
name match on both lists, the matching CAS Number will be highlighted automatically;
otherwise, a list of COMPASS-Calcs CAS Numbers will be displayed. The user may
double-click on any CAS Number in the list to insert the CAS Number into the
Contaminants data table for the selected contaminant.

2. From

the

Contaminant Maintenance

main screen (See

Figure 4.1

), the

Ozone Factor

, also

known as a temperature adjustment factor, can be input or edited for a contaminant.
temperature adjustment factors are used in Ozone Season daily rate emission calculations.
These calculations are performed during the Data Pipeline procedure and by a selection
in the

Emissions Maintenance

(Global) menu. A rate of 1.00 will result in a unit

conversion of tons/year into pounds/day of a contaminant for those sources that operate
25% in all seasons of the year. A rate of 2.00 will result in an emission rate two times
higher than would be calculated based on a simple conversion. Ordinarily, adjustment
factors greater than 1.00 will only be entered for volatile chemicals that evaporate more
rapidly in warm temperatures.