1. 1 Emissions Inventory Overview–Part 2 Melinda Ronca-Battista, ITEP

2. 2 Quantifying Emissions Emission Factor ◦ Conversion factor provided by EPA (AP-42) or other source to quantify emissions ◦ E.g., lbs mercury emitted per ton of coal burned Activity ◦ Collected by YOU ◦ Process data (tons of coal burned, hours of operation) ◦ Control measures (efficiency/presence of control equipment or procedures) Estimates Emission rate for a single pollutant ◦ E.g., 10 pounds/year mercury from small power plant

3. 3 Quantifying (cont.) Basic estimating equation E = EF x A Control efficiency equation E = A x EF X (1-ER/100) Where ◦ E = Emissions rate (TEISS calculates) ◦ EF = Emission factor (TEISS provides) ◦ A = Activity (You collect and enter into TEISS) ◦ ER = overall emission reduction efficiency (%)  Emission reduction (ER) efficiency not as important in simpler calculations

4. 4 Where do I get activity data? Process activity ◦ Directly from source ◦ From permits ◦ Monitoring/CEMs ◦ Questionnaires/Surveys Control efficiency ◦ Engineering estimates ◦ From permits

5. 5 Point Sources–Data Elements Location (address, lat/long) Stack parameters ◦ Height ◦ Diameter ◦ Flowrate ◦ Exit gas temperature

6. 6 Point Sources–Data Elements (cont.) Process-level information ◦ Flow diagram ◦ Materials being consumed (type and amount) ◦ Sub-processes involved ◦ Boiler throughput ◦ Operating schedules ◦ Control devices/efficiencies See the AERR for details

7. 7 Point Source Data for TEISS Location (address, lat/long) Facility/Site Name Release Points Emission Unit ◦ Processes  Control Equipment?  Period (Time Frame)  Emissions

8. 8 Nonpoint Source Data Location (your reservation) Process information Control equipment/measures ◦ Period (time frame)  Emissions

9. 9 Nonpoint Source Data Elements Process information ◦ Types of operations  Gasoline storage tank refilling  Unpaved roads ◦ Emissions (e.g. VOCs, PM) ◦ “Activity data” needed to calculate emissions  Type of refilling process (splash or submerged)  VMT, vehicle weight, speed, silt content, etc. ◦ Pollution-management practices or control measures  Dust abatement with water or petro-based chemical

10. 10 Mobile Source Data Elements Vehicle Miles Traveled (VMT) Road surface types Vehicle types & use Off-road sources & use ◦ Engine types, hours of use, season, etc. Mobile source data or emissions factors will typically come from other sources (DOT, air district, etc.) Adjust data according to your reservation (“top-down approach”)

11. 11 Mobile Source Data On-Road and Non-Road ◦ Location (your reservation)  Processes  Period  Emissions

12. 12 Fire Data Special Case: covers large area, like nonpoint sources, but in defined location like point sources New EPA format and TEISS 2.0 treat fires as EVENTS

13. 13 In Summary, a Final EI is… A list of air pollution sources ◦ For a defined area (reservation) ◦ For a defined time period (e.g., a year) Information about each source (address, activities/processes occurring at a facility) Estimate of emission rate for each source Information on how you determined sources and emissions estimates

14. 14 An EI can also contain… Charts/graphs to display and summarize quantitative data Maps Background information or other information about your area related to emissions/sources Copies of surveys, calculations used, references, etc.