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Emissions of criteria pollutants from Twentymile Coal (Permit 931101204), all activities and <br />insignificant sources, together with the permit emission limits for the Sage Creek Mine (Permit <br />10R01175F) must be combined for determination of major source thresholds for Operating <br />Permit purposes. <br />The owner or operator of this facility must calculate monthly emissions based on the calendar <br />month. <br />Compliance with the annual limits must be determined on a rolling twelve (12) month total. By <br />the end of each month a new twelve month total is calculated based on the previous twelve <br />months' data. The permit holder must calculate actual emissions each month and keep a <br />compliance record on site or at a local field office with site responsibility for Division review. <br />The owner or operator must use the emission factors found in Attachments A and B to calculate <br />emissions and show compliance with the limits. The owner or operator must submit an Air <br />Pollutant Emission Notice (APEN) and receive a modified permit prior to the use of any other <br />method of calculating emissions. <br />2_ The particulate emission control measures listed in Attachment C (as approved by the Division) <br />must be applied to the particulate emission producing sources as required by Regulation No. 1, <br />Section III.D.1.b. <br />The following control equipment must be maintained and operated to ensure satisfactory <br />performance. The owner or operator must monitor compliance with this condition through the <br />results of approved compliance tests (when required), compliance with the Operating and <br />Maintenance Plan, compliance records, and other methods as approved by the Division. <br />(Reference: Regulation Number 3, Part B, III.E.) <br />Facility <br />Equipment ID <br />AIRS <br />Point <br />Control Device <br />Controlled <br />Pollutants <br />5010 <br />110 <br />Baghouse <br />PM, PM10i PM2.5 <br />5014 <br />114 <br />Baghouse <br />PM, PM10i PM2.5 <br />5017 <br />117 <br />Baghouse <br />PM, PM101 PM2.5 <br />5023 <br />123 <br />Baghouse <br />PM, PM10i PM2.5 <br />5301 <br />190 <br />Wet Scrubber <br />PM, PM10, PM2.5 <br />5302 <br />191 <br />Wet Scrubber <br />PM, PM10, PM2.5 <br />5303 <br />192 <br />Wet Scrubber <br />PM, PM10i PM2.5 <br />5304 <br />193 <br />Wet Scrubber <br />PM, PM101 PM2.5 <br />��COLORADO <br />I Air Pollution Control Division <br />Oeparun %of Putbc Health 6 Ernaorvnent <br />Page 3 of 26 <br />