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

Home Browse Search

Appendix G Air Quality Analysis Modeling Report Note that emissions from the various emission sources and activities listed earlier in this section may occur during any of the project phases, in any of the defined area sources. For example, fugitive dust and vehicle exhaust emissions will occur during all construction phases as well as during the production phase. Various construction equipment used in all area sources will similarly generate fugitive dust and vehicle exhaust emissions, and specific construction activities such as road scraping will occur in all area sources during construction. Once coal mining (Phase 3) begins, equipment used to haul coal around the mine site and away from the mine site will result in fugitive dust and vehicle exhaust emissions in the mine area. Ongoing production activities will also generate emissions from coal transfer points, stock piles, and coal processing activities. Emission summary tables are provided in Attachment B of this report and provide additional detail. Mitigation measures and emissions controls will be implemented to reduce particulate matter/fugitive dust emissions during construction and ongoing production activities. Fugitive emissions from all vehicles traveling on non-paved surfaces during all project phases will be controlled utilizing chemical suppressants applied to non-paved roads. Storage piles will be watered as necessary to limit wind erosion potential and reduce fugitive emissions. Most coal transfer points and processing activities during coal production will be enclosed and therefore will reduce fugitive particulate matter emissions. With regard to construction-related emissions (Area Sources 1, 2, and 3), modeled emissions are assumed to occur only during certain hours of the day. Information regarding average workday hours was provided by CAM or their selected engineering design consultants. 3.5 Near-Field Analysis (AERMOD) Results Predicted (modeled) maximum criteria pollutant concentrations are presented in Tables 3-5, 3-6, and 3.7. For each criteria pollutant, the maximum predicted (modeled) concentration is defined as: • NOX, SOz, PMio, and PM2.5 annual average -the highest modeled annual averaged values over all 5 years; • CO and SOz short term averaging (1-hr, 8-hr, 3-hr, 24-hr) -the highest of the first high values (for each receptor) over all 5 years; • PMio short term averaging (24-hr) -the highest of the second high values (for each receptor) over all 5 years; • PM2.5 short term averaging (24-hr) -the highest of the sixth high values (for each receptor) over all 5 years. Predicted (modeled) maximum criteria pollutant concentrations were added to applicable background concentrations and the total maximum predicted concentrations were compared to the applicable NAAQS and CAAQS. All total maximum predicted concentrations and the corresponding NAAQS/CAAQS values are presented in Tables 3-5, 3-6, and 3-7. For all project phases, none of the maximum predicted concentrations (modeled maximum concentration plus background concentration) exceed a NAAQS or CAAQS. Therefore, no negative near-field air quality impacts are anticipated from the proposed project. G- ll DBMS 523