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

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Appendix G Air Quality Analysis Modeling Report 4.4 Emission Sources and Modeled Emission Rates (Far-Field Analysis) Emission sources modeled in CALPUFF-Cite were established similarly to those modeled in AERMOD, as described in Section 3.4 of this Report. All emission sources and activities are the same, and the project is divided into three distinct phases (railroad construction, mine area/transmission line/haul road construction, and production), with distinct timelines for each project phase. However, rather than establishing all emission sources as area sources in the model, the transmission line, railroad, and haul roads were characterized as volume sources in CALPUFF-Cite. Table 4-2 provides a summary of the emission sources included in each phase of the far-field analysis. Table 4-2 SUMMARY OF EMISSION SOURCES INCLUDED IN FAR-FIELD ANALYSIS, BY PROJECT PHASE Phase 2 Phase 1 Construction: Mine Area / Phase 3 r Emission Source Railroad Production Transmission Line /Haul Construction Roads Volume 1: Transmission Line X Volume 2: Railroad X Volume 3: Haul Roads X Area: Mine Area X X 1Mine area emissions during production phase include emissions from vehicle traffic on mine area roads. The transmission line, railroad, and haul road emission sources used in the far-field (CALPUFF- Lite) analysis are not "bounded," as they were in the near-field (AERMOD) analysis. The full extent of the proposed transmission line, railroad, and haul road (14.5, 14.5, and 4.6 miles, respectively) are included in the CALPUFF-Cite-defined emission sources. Refer to Figure 3-1 for an illustration of these emission sources, but note that Figure 3-1 does not show the full extent of these emission sources as represented in CALPUFF-Cite. Detailed source parameters used in the far-field analysis are provided in Table 4-3. G-21 DBMS 533