2020-06-25_REVISION - C1981035 (3)

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Table 2.2-2 Federal Prevention of Significant Deterioration Limits Pollutant Averaging Time Maximum Allowable Increase(µg/m3) Class I Area Class II Area Class III Area PM2.5 Annual 1 4 8 24-hour 2 9 18 PM10 Annual 4 17 34 24-hour 8 30 60 S02 Annual 2 20 40 24-hour 5 91 182 3-hour 25 512 700 NO2 Annual 2.5 25 50 µg/m3=micrograms per cubic meter of air The CAA also enacted the New Source Performance Standards (NSPS) and National Emissions Standards for Hazardous Air Pollutants (NESHAP) for specific types of equipment located at new or modified stationary pollutant sources. NSPS regulations limit emissions from source categories to minimize the deterioration of air quality. Stationary sources are required to meet these limits by installing newer equipment or adding pollution controls to older equipment that reduce emissions below the specified limit.The Project Area would include equipment that is subject to various NSPS in 40 CFR Part 60, Subpart Y. NSPS and NESHAP standards also apply to the locations of final coal combustion. The CAA Amendments of 1990 introduced a new facility-wide Federal Operating Permit program. Federal Operating Permits,also known as Title V permits,are required for facilities with the potential to emit more than 100 tpy of a regulated pollutant, 10 tpy of any single hazardous air pollutant (HAP), or 25 tpy of any combination of HAPs and considered to be major sources of air quality emissions. No NAAQS exist for HAPs; instead emissions of these pollutants are regulated by a variety of laws (e.g., NESHAPs)that target the specific source class and industrial sectors for stationary, mobile, and product use/formulations. However,Title V permitting is still required if HAP emissions rise above the defined thresholds. The mine's potential to emit is below the requirements to obtain a Federal Operating Permit and, therefore, it would not be subject to Title V permitting.Title V operating permit requirements are typically applicable for the locations of final coal combustion. Both the Pueblo and Tijeras cement facilities have Title V permit applicability. The PSD regulations described previously also regulate the degradation of Air Quality Related Values (AQRV) in Class I areas. The authority to protect AQRVs in federally mandated Class I areas is to be done as part of the pre-construction permitting process of major sources.AQRVs include all resources sensitive to changes in air quality and typically include visibility degradation, pollutant deposition on vegetation and water bodies, and acidification of sensitive water bodies. Dunn Ranch Area LBA and Mining Plan Modification 7 Technical Resources Report