2020-10-27_PERMIT FILE - C1981035 (22)

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designated as Attainment for all criteria pollutants based on monitoring results that were below the applicable NAAQS (all Colorado communities are currently in attainment of all NAAQs except the Front Range 03 control area, which is in nonattainment [moderate] for the eight-hour 03 standard). Table 2.2-1 National Ambient Air Quality Standards Pollutant Primary/ Averaging National Form Secondary Time Standard Carbon Not to be exceeded more than once a Monoxide(CO) Primary 8-hour 9 ppm year 1-hour 35 ppm Lead Primary and Rolling 3- 0.15 pg/m3 Not to be exceeded secondary month average Nitrogen 98th percentile of 1-hour daily Dioxide(NO2) Primary 1-hour 100 ppb maximum concentration,averaged over 3 years Primary and Annual 53 ppb Annual Mean secondary Ozone Primary and Annual fourth-highest daily maximum (03) secondary 8-hour 0.070 ppm 8-hr concentration,averaged over 3 years Particle Pollution PM2.5 Primary Annual 12 pg/m3 Annual mean,averaged over 3 years Secondary Annual 15 pg/m3 Annual mean,averaged over 3 years Primary and 24-hour 35 pg/m3 98th percentile,averaged over 3 years Secondary PM10 Primary and 24-hour 150 pg/m3 Not to be exceeded more than once secondary per year on average over 3 years Sulfur Dioxide 99th percentile of 1-hour daily (S02) Primary 1-hour 75 ppb maximum concentrations,averaged over 3 years Secondary 3-hour 0.5 ppm Not to be exceeded more than once per year n/a 3-hour* 700 µg/m3 Not to be exceeded more than once in any twelve-month period Source: http://www.epa.gov/air/criteria.htmi as of October 2015 µg/m3= micrograms per cubic meter of air ppm=parts per million, ppb=parts per billion *State standard established by the Colorado Air Quality Control Commission The CAA also divides areas where air quality is already cleaner than required by federal standards into three classes, and specifies the increments of SOz, NO2 and particulate pollution allowed in each class as regulated by the Prevention of Significant Deterioration (PSD) regulations (40 CFR 52.21). Class I areas include international and national parks, wilderness, and other pristine areas; allowable increments of new pollution in these areas are very small. Class 11 areas include all attainment and not classifiable areas, which are not designated as Class 1; allowable increments of new pollution in these areas are modest. Dunn Ranch Area LBA and Mining Plan Modification 5 Technical Resources Report