Transcript PowerPoint Slides

Minor Source
Emissions Inventory
Educational Tutorial
“Emission Factors”
Brian Gedlinske
Environmental Specialist
Objectives
• Provide general guidance on selecting an
Emission Factor (EF)
• Review resources available for locating EFs
EF Resources
Tutorial Focus
• Stack Testing Data
• AP42 http://www.epa.gov/ttn/chief/ap42/index.html
• WebFIRE http://cfpub.epa.gov/webfire/
• DocDNA https://dna1.documentdna.com/index.jsp?URL_CONTEXT=/iowadnr
IDNR EI Web Site
http://www.iowadnr.gov/InsideDNR/RegulatoryAir/EmissionsInventory/
MinorSources.aspx
Link to EPA’s TANKS software program
Source Classification Code Spreadsheet (aka SCC numbers)
EF Hierarchy
Select and use the most representative EF
Hierarchy
Most Preferred EF
 Continuous emission monitoring (CEM)
 Stack Testing Results
 Mass/Material Balance
 EPA EFs – “A” rating is best, “E” & “U” ratings less reliable
 Vendor Supplied EFs – e.g., manufacturer of equipment
provides stack test data
 Engineering Estimate
EPA EF Ratings
 A = Excellent. EF is developed primarily from A and B rated source test data taken
from many randomly chosen facilities in the industry population.
 B = Above average. EF developed primarily from A or B rated test data from a
moderate number of facilities.
 C = Average. EF developed primarily from A, B, and C rated test data from a
reasonable number of facilities.
 D = Below average. EF developed primarily from A, B and C rated test data from
a small number of facilities.
 E = Poor. EF developed from C and D rated test data from a very few number of
facilities.
 U = Unrated. EF developed from source tests which have not been thoroughly
evaluated, research papers, modeling data, or other sources that may lack supporting
documentation.
Stack Testing Information
Review cover page or Initial Performance Testing Requirements section
(typically Section 12) of Air Quality Construction Permit
 Indicates if stack test was required – if so, data should be available
 Contact the IWRC via MSEI web site or
 IDNR stack testing staff at
 http://www.iowadnr.gov/InsideDNR/RegulatoryAir/Compliance/StackTesting.aspx
Stack Test
Results most easily
found in a stack test
summary page
Usually results are for
particulate matter (PM)
May need to find EFs for other
pollutants
Results expressed in
lbs/hr – use the average
stack test value as your
Emission Factor
EF Resources
• AP42 http://www.epa.gov/ttn/chief/ap42/index.html
Scan AP42 Web site for appropriate chapter based on your process
Drill down to find an EF
Examples:
Grain Elevator – Grain Receiving Operations EF
EF Resources
• WebFIRE http://cfpub.epa.gov/webfire/
Examples:
• Emission factor for a Grain Receiving – Hopper Truck SCC number
from AP42 – 30200552
EF Resources
• DocDNA – an electronic database for retrieving archived
air quality bureau records
https://dna1.documentdna.com/index.jsp?URL_CONTEXT=/iowadnr
• User ID: airquality
• Password: iowadnr1
• Potentially useful for finding…
 Previously submitted construction permit applications
 Engineering evaluations – may provide engineering estimates for
emission factors
 Stack test results
• Search database by seven digit facility number
For Additional Assistance
• Contact the IWRC via the IWRC’s MSEI web site or
call 1-800-422-3109.