2008-02-22_APPLICATION CORRESPONDENCE - C2008086 ‎(40)‎

• Permit No: C2008086
• IBM Index Class Name: Application Correspondence
• Doc Date: 2/22/2008
• Doc Name: PDEIS Appendix G Air Quality Analysis Modeling Report
• Media Type: D
• Archive: No

Appendix G
Air Quality Analysis Modeling Report
3.4.2 Emission Rates
Total emissions for each of the proposed mine's emission sources and activities were estimated
based on detailed construction and equipment information supplied by CAM or its selected
engineering design consultants. Emission factors and methodologies recommended by the
USEPA were used in the calculations to the extent possible. For detailed emission calculation
summaries, refer to Attachment B of this Report. Table 3-3 is a summary of the total expected
emissions for the proposed Red Cliff Mine.
Table 3-3
PROJECTED EMISSION INCREASES FOR PROPOSED RED CLIFF MINE,
GROUPED BY PROJECT PHASE (tpy)i
Phase 2

Pollutant Phase 1
Construction: Mine Area / Phase 3
Railroad Construction Production
Transmission Line /Haul Roads
NOX 73.16 25.16 80.20
CO 0.05 0.023 0.04
SOX 23.97 8.36 24.34
PM10 27.71 15.71 9.57
PM2_5 84.10 49.54 24.13
1Tons per Year
Emission rates included in the near-field analysis are less than the total project emission rates
shown in Table 3-3. Since area sources 1-3 are bounded (as described in the previous section) in
order to conduct the near-field analysis, modeled emissions were calculated to represent these
bounded areas, rather than the entire areas for railroad construction, transmission line
construction, and mine area construction. In order to estimate emissions for the bounded area
sources, the total emissions were reduced by the appropriate fraction of the bounded area. For
example, the proposed rail spur for this project is estimated to span 14.5 miles; however, for this
near-field analysis, the rail spur length was bounded to 23 miles, or approximately 16 percent of
the expected total length. Accordingly, the total emissions for railroad construction were
reduced by 84%, so that only 16 percent of the total emissions were modeled for the 2.3 miles of
rail spur area source. The amount by which estimated emissions were reduced for each area
source is listed in the far right column of Table 3-2.
A summary of emission rates entered into AERMOD for the near-field analysis is provided in
Table 3-4. Emission rates are grouped according to the specific area source and are expressed as
both the long-term (tons per year, or tpy) and short-term (grams per second, or g/s) emission
rates. Note that for Area Source 4 (Mine Area), two sets of data are presented, for the
construction and the production phases. Emissions from Area Sources 1, 2, and 3 represent only
construction activities.
G-9
DBMS 521