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Because the Deserado Mine is primarily a source of PM10 emissions, only the recent monitoring <br />data for particulate matter is shown below. More so than other pollutants, PM10 is a localized <br />pollutant where concentrations vary considerably. Thus, local average and maximum <br />concentrations of PMIo are more meaningful than averages covering large regions or the entire <br />state. The data below is presented for qualitative purposes only. <br />Table 7. Localized Monitoring Data (2010) <br />I <br />sources: Colorado Air Quality Data Report 2010, available at http:// www. colorado .aov /airquality /tech.aspxx <br />Potential Impacts Analysis for Criteria Pollutants <br />A detailed air quality assessment, including modeling, of the mine was conducted for previous <br />permit modifications (2003) authorizing production capacities that are still currently in effect. <br />The current APCD permit issued by the State authorizes up to 3.2 million tons of Run of the <br />Mine (ROM) coal to be produced and processed annually. ROM coal includes any produced <br />waste aggregates separated from the coal product that is sold from the mine. According to the <br />CDPHE modeling review report the maximum 24 -hour impact from the coal mine is 113.13 <br />µg /m3, at or beyond the permit boundary. When a background of 34 µg /m3 is added, the <br />cumulative impact is 147.13 µg /m3. This is below the federal standard of 150 µg /m3. The <br />maximum annual impact beyond the permit boundary is 38.21 µg /m3. When a background of 10 <br />µg /m3 is added, the cumulative impact is 48.21 µg /m3. This was below the federal annual PM10 <br />standard of 50 µg /m3, which has since been rescinded. Subsequently APCD issued the approved <br />modified permit for the mine. <br />With respect to all mobile sources at the site, emissions from these sources are not expected to <br />impact regional air quality due to the fact that they are a very small portion of the existing county <br />inventory and are not significant by themselves. No increase in the current use is expected by <br />the potential approval of the LBA, and current air quality in the region (i.e. attainment) should <br />not be affected by their continued use. <br />DOI- BLM -CO- 110- 2012- 0023 -EA 25 <br />PM10 <br />P2.5 <br />County <br />Location <br />Annual <br />24 <br />' fir' <br />24 <br />1 <br />Ave. <br />Annual <br />Hour <br />Hour <br />Ex, <br />Delta <br />Delta - Health Dept 560 Dodge St. <br />23.4 <br />125 <br />0 <br />Rifle - Henry Building 144 E. 3 <br />25.5 <br />59 <br />0 <br />< 3 yrs <br />< 3 yrs <br />Garfield <br />Data <br />Data <br />Parachute - Elem. School 100 E. 2 <br />22.5 <br />125 <br />0 <br />Grand Junction - Pitkin 6451/4 Pitkin <br />Ave. <br />26.8 <br />171 <br />1 <br />Mesa <br />Grand Junction - Powell 650 South <br />Ave. <br />22.9 <br />155 <br />0 <br />9.3 <br />34.5 <br />Clifton - Hwy. 141 & D Rd. <br />23 <br />189 <br />3 <br />I <br />sources: Colorado Air Quality Data Report 2010, available at http:// www. colorado .aov /airquality /tech.aspxx <br />Potential Impacts Analysis for Criteria Pollutants <br />A detailed air quality assessment, including modeling, of the mine was conducted for previous <br />permit modifications (2003) authorizing production capacities that are still currently in effect. <br />The current APCD permit issued by the State authorizes up to 3.2 million tons of Run of the <br />Mine (ROM) coal to be produced and processed annually. ROM coal includes any produced <br />waste aggregates separated from the coal product that is sold from the mine. According to the <br />CDPHE modeling review report the maximum 24 -hour impact from the coal mine is 113.13 <br />µg /m3, at or beyond the permit boundary. When a background of 34 µg /m3 is added, the <br />cumulative impact is 147.13 µg /m3. This is below the federal standard of 150 µg /m3. The <br />maximum annual impact beyond the permit boundary is 38.21 µg /m3. When a background of 10 <br />µg /m3 is added, the cumulative impact is 48.21 µg /m3. This was below the federal annual PM10 <br />standard of 50 µg /m3, which has since been rescinded. Subsequently APCD issued the approved <br />modified permit for the mine. <br />With respect to all mobile sources at the site, emissions from these sources are not expected to <br />impact regional air quality due to the fact that they are a very small portion of the existing county <br />inventory and are not significant by themselves. No increase in the current use is expected by <br />the potential approval of the LBA, and current air quality in the region (i.e. attainment) should <br />not be affected by their continued use. <br />DOI- BLM -CO- 110- 2012- 0023 -EA 25 <br />