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Homepage » Lesson 10 » Lesson 10.2
In Lesson 7, you imported data for point, non-point (area), non-road mobile and on-road mobile sources from the NEI for the counties surrounding. Let's take a closer look at these sources before we get started on adding sources to your reservation's project.
 TEISS Exercise: In this exercise you will use the Reports function to identify the largest sources of PM10, NOx and SOx pollution in your area.
Launch TEISS and open your reservation's project. Use the Reports button on the main toolbar to access the Reports window. First, take a look at the Total Emissions: Total by Source Type Bar Chart report. In the advanced location filter, select all of the counties you imported data for. In the advanced pollutant filter, select only PM10, NOx and SOx and/or SO2.
!!Note: In the reports advanced pollutant filter, look at PM10 (Includes filterable and condensable)
In this example report, which includes only point and area sources, you can see that the majority of SO2 in this area is emitted by point sources. |
By looking at the bar charts for each pollutant, you may notice that one source type emits more pollution than the others. For example, the majority of SO2 in your area may be emitted by point sources. Or the majority of PM10 may be emitted by area sources. Your next question would be what point sources emit SO2 in my area? Or, what area sources are emitting all that PM10? To get the answers to these questions, use the individual source type pie charts.
The Area Sources: "Total by SCC2 Category- Pie Chart" example below shows us that the majority of PM10 emitted by area sources in that area is from "Miscellaneous Area Sources" with another big slice of the pie coming from "Mobile Sources." Mobile sources is pretty clear, but what is meant by "Miscellaneous Area Sources"? You can use the Area Sources: "Total by SCC Code" report to get more detail.
By looking down the PM10 column of the table report below, you would see that Forest Wildfires were the specific kind of miscellaneous source that produced 21,000 tons.
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In the example below, you can see that 3 point sources have the largest slices of the VOC emissions pie.
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 TURN IN: Worksheet for largest sources from Region 7 workshop.
When you look at the area sources that produce the most air pollution in the counties surrounding you, consider that those area sources might also be important on your reservation. Be sure to include those area sources in your inventory.
The information you have just developed on which off-reservation sources are the largest emitters of these 3 pollutants should be summarized in an Off-Reservation Emissions section of your final EI report. You should use the same procedure to determine what source types and specific sources are the largest for any other pollutants that your tribe is concerned about. The information you develop on point sources, particularly, can be used to determine if your tribe wants to track permit activity and/or enforcement actions at those sources.
If your tribe has no on-reservation sources that you wish to inventory, or if you are doing a "first cut" EI, to prove to EPA that there are sources on your reservation that are not included in the NEI, you could be done with a Level 4 EI at this point. In a Level 4 EI, all you must do is look at the existing data and use it to define your problems and concerns. By writing a report summarizing what you found in the existing data, and detailing what it means to your reservation you have completed a Level 4 EI. The standard reports provided by TEISS can be used as figures in your Level 4 report.
End of Lesson 10.2
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