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Reclamation of the project site is planned to occur intermittently throughout the project's I;. 56-year operational period and potentially longer. k Regional emissions generated during project-related operations include emissions of fugitive dust and emissions generated by stationary and mobile sources (NO, ROG, SOX, CO, and PM,,.) Implementation of the proposed project would generate regional emissions i from three sources: fugitive dust associated with mining and reclamation activities, exhaust emissions from mobile sources, and plant emissions. These sources and related impacts are discussed as follows: Fugitive Dust (PM,o) Emissions Mining and reclamation activities are a source of fugitive dust (PM,,) emissions that can have a substantial temporary impact on local air quality. Fugitive dust emissions are associated with land clearing, ground excavation, cut and fill operations, and heavy f " equipment travel on unpaved roadways. Dust emissions vary substantially from day to day, depending on the level of activity, the specific operations, and weather conditions. Table 4.5-5 presents the estimated PM,,emissions associated with mining and reclamation activities on the project site. Emission estimates are based on EPA AP-42 emission factors and methodology obtained from the Sacramento Air Quality Management District's ` Air Quality Thresholds of Significance, as recommended by the SJVUAPCD. As indicated, the proposed mining, reclamation, and material transport activities would generate an d k estimated 3,083.4 lbs/day of PM,,) emissions. Despite the use of dust control measures, the projected level of PM,o emissions would exceed the SJVUAPCD interim significance threshold of 15 tons/year (82 lbs/day). Therefore, operational PM,() emissions for these alternatives would, by themselves, be considered a significant adverse impact. IC la ff i { Draft Environmental Impact Report 4-73 ER-96-3 � i�