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
Table 3-1
SUMMARY OF AREA SOURCES INCLUDED IN NEAR-FIELD
ANALYSIS, BY PROJECT PHASE

Det"med "Area" Source Phase 1
Railroad
Construction Phase 2
Construction: Mine Area/
Transmission Line/Haul Roads Phase 3
Productionr
Area L Transmission Line X
Area 2: Railroad X
Area 3: Haul Roads X
Area 4: Mine Area X X
1Mine area emissions during the production phase include emissions from vehicle traffic on mine area roads.
The transmission line, railroad, and haul road area sources used in the near-field analysis were
defined according to the proposed land use application and right of way (ROW) in order to keep
the analysis within the "near-field," or in other words, centralized to the area where the most
emissions will occur over all project phases. Figure 3-2 illustrates the modeled area sources and
the modeling receptor network. Notice in Figure 3-2 that all defined area sources for the analysis
are located within the proposed land use area, even though some of the sources (transmission
lines, railroad, and haul roads) will extend farther out than the proposed land use area. This
approach to defining the near-field area sources provides for a more centralized approach, and is
considered to be a conservative review of the highest near-field impacts since the highest
emission rates are expected to occur near the mine area. Emissions from construction along the
transmission lines, railroad, and haul roads further out than these defined areas are considered in
the far-field analysis, discussed in the next section. Detailed area source parameters used in the
near-field analysis are provided in Table 3-2.
Table 3-2
AREA SOURCE PARAMETER DETAIL, NEAR-FIELD ANALYSIS (AERMOD)
Lower Left Lower Left Source Initial Z Percentage
Parameter ~ Corner Corner Base Release Dimension GIS Derived of Emissions

Area Source ~, r
Easting r
Northing
Elevation Height

(
)
(Sigma- Z) Area
Z
(
) Z
Modeled
(m) (m) (m) m (m) m (%)
Area Source 1 11%
(Transmission Llne) 174192.7 4361281.8 1,560 3 2.8 76,348 (89% reduction)
Area Source 2 16%
(Ra1lYOad) 1732202 4361325.3 1,560 3 2.8 619,200 d
i
(84% re
uct
on)
Area Source 3 g6%
(Haul ROaC1S) 171780.7 4363103.5 1,700 3 2.8 309,802 (14% reduction)
Area Source 4 100%
(Mine Area) 173193.3 4362935.1 1,700 3 2.8 4,562,020 d
ti
(no re
uc
on)
`Projected Coordinate System = UTM NAD 83 Zone 13 North
This column is explained in Section 3.4.1 of this Report.
C7-g
DBMS 520