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conservative or worst case emissions estimates since these sources emit higher amounts of <br />pollutants per unit of energy consumed than LDDT would. <br />Table 4 Annual Direct Criteria and GHG Emissions (Tons) <br />Source Tti -pe <br />PMy,�'; <br />PM2.; <br />VOC <br />CO + <br />NO, <br />s02 <br />co, ; <br />CHa <br />N,O <br />ALL APEN <br />124.15 <br />14.26 <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Reported Sources <br />Vent Construction <br />1.97 <br />0.51 <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />Fugitives <br />Fuel Storage Tanks <br />NA <br />NA <br />3.992 <br />NA <br />NA <br />NA <br />NA <br />NA <br />NA <br />(XA) <br />Emergency <br />0.01 <br />0.01 <br />0.01 <br />0.14 <br />0.13 <br />0.00 <br />19.43 <br />0.00 <br />ND <br />Generator (TBD) <br />Methane Sources <br />NA <br />NA <br />ND <br />NA <br />NA <br />NA <br />19,011 <br />923 <br />NA <br />(VAM) <br />Methane Sources <br />GVB <br />NA <br />NA <br />ND <br />NA <br />NA <br />NA <br />ND <br />ND <br />NA <br />Misc. Heating <br />0.17 <br />0.42 <br />0.67 <br />6.28 <br />10.89 <br />0.42 <br />10,468 <br />0.17 <br />0.08 <br />Equipment <br />Underground & <br />Surface Mining <br />2.16 <br />2.10 <br />3.22 <br />14.48 <br />17.81 <br />0.34 <br />1,580.86 <br />0.09 <br />0.04 <br />Equipment <br />Pick -ups (Mine <br />0.06 <br />0.06 <br />0.09 <br />1.26 <br />0.13 <br />0.04 <br />186.10 <br />ND <br />ND <br />Operations) <br />Vent Construction <br />(Heavy Equipment <br />0.11 <br />0.10 <br />0.13 <br />0.68 <br />1.39 <br />0.02 <br />139.34 <br />0.01 <br />0.00 <br />& Worker Trips) <br />1 ND = No Data, NA = Emission type not applicable to the source. <br />2 Emissions based on General APEN exemption (XA) threshold in attainment area (< 2.0 tpy) x 2 tanks. <br />3 Mobile sources emissions are for exhaust only. <br />Indirect Emissions <br />Electrical energy consumed at the site (mine and electric rail) can reasonably be expected to <br />produce emissions from the supplying source, unless that source is some form of renewable <br />energy. It is possible to provide rough estimates of emissions resulting from mine electricity <br />consumption if the annual energy consumption data is known. Reasonable emissions estimates <br />can be made for some pollutants (NOx, SO2, CO2, N20, & C114) by making use of EPA's <br />Emissions & Generation Resource Integrated Database (eGRID). The eGRID tool is a <br />comprehensive inventory of environmental attributes of electric power systems and is based on <br />available plant- specific data for all U.S. electricity generating plants that provide power to the <br />electric grid and report data to the U.S. government, including the following agencies: EPA, the <br />Energy Information Administration (EIA), and the Federal Energy Regulatory Commission <br />(FERC). Emissions data collected by EPA is integrated with generation data from EIA to <br />produce useful values like pounds of emissions per megawatt -hour (lb /MWh), which allows <br />direct comparison of the environmental attributes of electricity generation by state, U.S. total, <br />company, and by three different sets of electric grid boundaries. Table 5 provides an estimate of <br />indirect emissions for the mine's electrical consumption data for 2011. The most recent data <br />available online (2005) suggests Colorado imports only 1 -3 percent of its total electricity demand <br />on an annual basis. For the practical purposes of this EA, the BLM considers Colorado to be <br />neither a net energy exporter, nor importer, and therefore all indirect emissions estimates from <br />mine and rail electricity consumption are based on Colorado source data. <br />DOI- BLM -CO- 110- 2012- 0023 -EA 22 <br />