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~. .....• ..- .- Annual Arithmetic 50 Uglm3 .. Same as primary standard • 50 pg(m' PM,o Mean 24-hour 150 /m Same as rima standard 150 /m Fine Particulate Annual Arithmetic 15 pg/m3 Same as primary standard - tt PM M Mean a er ( 2.5) 24-hour 65 /m Same as rima standard - Average Annual 0.03 ppm _ Sulfur Dioxide 80 /m (SOz) 24-hour 0.14 m _ - See Note e 3-Hour - 1,300 /m Source: EPA 2003, CDPHE 2002a a. National Ambient Air Quality Standards (other than 03, particulate matter, and those based on annual averages or annual arithmetic mean) are not to be exceeded more than once per year. b. Colorado Ambient Air Quality Standards (other than annual averages) are not to be exceeded more than once per year. c. National Primary Standards: The levels of air quality necessary, with an adequate margin of safety, to protect the public health. d. National Secondary Standards: The levels of air quality necessary to protect the public welfare from any known or anticipated adverse effects of pollution. e. The Colorado SOz standard contains more detail than can be easily displayed in this table. SOz is not a pollutant of interest for this Environmental Assessment, and therefore, the detail is not included. Impacts of Alternative A, No Action, on Air Quality Under Alternative A, No Action, the Dickerson Pit would not expand. Impacts on air quality in the analysis area would continue as the result of current mining operations at the pit, which are expected to last for another 1'to 3 years. Current operations at the pit that would contribute to emissions of particulate matter are blasting, crushing, screening, vehicle traffic, and reclamation grading. Particulate matter emissions would be greatest during crushing operations. Particulate matter emissions would be controlled through the use of water trucks, a water storage tank, two small sump pumps, and spray bars on the cone crusher and stacking conveyors. The operation of combustion engines, used on the crushers, conveyors, and trucks, would produce increased emission levels of nitrogen oxide, carbon monoxide, carbon dioxide, and SOz, which would quickly dissipate as the air moves off site. The operator and/or the contractor operating the equipment would comply with all state air quality regulations and permitting requirements. The possibility exists for leaks or spills of hydrocarbon products used on site. Spilled hydrocarbon products could volatize and enter the atmosphere. W ith the mitigation measures and prompt response in the event of a spill, these impacts could be localized, with minor, intermittenUshort term adverse impacts on air quality. Therefore, with mitigation, the continuing mining operations at the Dickerson Pit would result in localized, mostly intermittenUshort term, negligible to minor, adverse impacts on air quality within the analysis area. Cumulative Impacts Under Alternative A, cumulative impacts on air quality throughout the park could result from the continuing operation of the nonfederal mineral operation within the park combined with other activities that could contribute to air quality impacts in the area of analyses. These include routine maintenance of park roads; park, commercial, and recreational vehicle use; and public recreational activities such as motor boating. Natural and prescribed fires would also add to air pollution. Activities outside the park that would contribute to impacts on air quality include various land development projects, road building and maintenance, vehicle emissions, and fires. As a result of these activities, cumulative impacts on air qualily in the park are expected to be 37