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Mr. R K Hancock, III <br />Mr. Charles M. Machovec <br />• Apri14, 2005 <br />Page 2 of 10 <br />This letter addresses the additional outstanding requirements and summarizes the new <br />modeling results. Presented aze the emission calculations for the TAHR, new wind <br />erosion calculations based on the new meteorological data, meteorological data <br />processing procedwes, and modeling methodologies and results. For detailed <br />information on the HGTI facility please see the above referenced document. <br />Emission Calculation for the TAHR <br />Emissions for the TAHR were calculated using the same emission equation as in the <br />December 2004 permit application, from the Compilation of Air Pollutant Emission <br />Factors (AP-42) Volume I, Section 13.2.2: <br />Q (lbs l YMT) = k(121a `~ /b E <br />where: l l l l <br />TSP PMlo <br />k= 4.9 1.5 <br />a= 0.7 0.9 <br />b= 0.45 0.45 <br />• W=65 tons (mean weight) <br />E=0.75 (90 precipitation days with rain 0.01 inches or more) <br />Using the above equation and variables provides an emission factor of 8.094 lbs/VMT for <br />TSP and 2.088 IbsJVMT for PMIO. The roundtrip road distance is 7.713 miles. <br />The TAHR will be controlled with water and chemical dust suppressants to achieve 80% <br />control (see Emission Factor Document for AP-42, Section 13.2.2, Unpaved Roadr, Final <br />Report (MRI, 1998). The maximum amount of coal transported in any day will be 8,500 <br />tons, not to exceed 2,000,000 tons per yeaz. Dividing the daily maximum by 16 <br />operating hours per day gives an hourly average of 531 tons, or a total of 58.541 <br />VMTs/how. Thus, the average maximum hourly emissions for PMIO will be: <br />Q,,. = C2.0~~ s 1158.5 ~rVNIT l~l - 0.8~ <br />Qn, = 24.451bs / hr /I <br />Annual emissions are based on a throughput capacity of two million tons per yeaz, with <br />220,391.4 VMTs. Thus annual emissions will be: <br />I• <br />44 Inverness Drive East f Building C ~ Englewood, Colorado 80112 <br />303Y790-1332 ~ Fax 303/790-7820 <br />www.mcvehil-monned.com <br />