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Mr. R K Hancock, III <br />Mr. Charles M. Machovec <br />• Apri14, 2005 <br />Page 3 of 10 <br />_ 2.0881bs 220,391.4 VM7' tons 1- 0.80 <br />Q'" ( hMT , yr ) 20001bs)( <br />Q~, = 46.02 tons / yr <br />As coal hauling will follow a 16 hour per day, 6 day per week, 52 week per year <br />schedule, this is equivalent to an annualized rate of 23.05 lbs/hour. <br />Wind Erosion <br />The wind erosion emissions from disturbed areas were recalculated due to the new <br />meteorological data set. Detailed calculations are presented in Attachment A. As <br />presented in the December 2004 application, any hourly wind speed over 8.43 m/s will <br />generate emissions, and 103 hours of a possible 8,436 valid hours exceed this threshold. <br />These 103 hours of winds had velocities ranging from 8.46 to 14.82 mis. The estimated <br />uncontrolled emission factor for PMIO is calculated to be 1,2701bs/Acre-yr. For seven <br />acres total, the uncontrolled annual emissions are 4.4 tons per year and 2.2 tons per yeaz <br />controlled. <br />Processing of Meteorological Data <br />Mr. Machovec emailed to MMA on Mazch 1, 2005 one yeaz of the Mt. Zirkel <br />meteorological data collected from December 1, 1994 through November 30, 1995. The <br />first 14 days were missing, however the remainder of the data set was neazly 100% <br />complete. These data were processed via MPRM, along with mixing heights from Grand <br />Junction. Mixing height data were generated using EPA's Mixing Height program. The <br />two data file inputs to this program are upper air data from the twice daily radiosondes <br />and corresponding surface data, both from the National Climatic Data Center (NCDC). <br />As requested by Mr. Machovec, the MRRM calms processing was set at 0.22 (OS CLM <br />0.22) when processing the Mt. Zirkel surface data through Stage 1. Besides the first 14 <br />days, missing data were substituted using lineaz interpolation because MPRM will not <br />run unless there is no missing data. The first fourteen days were marked as missing for <br />the final pre-processed data file, per directive of APCD. The input control files, resultant <br />data files, and generated reports from each stage (Stage 1 through 3) aze presented on CD <br />in Attachment B. <br />Modeling MethodoloQV and Results <br />Modeling was performed for the HGTI using the pre-processed Mt. Zirkel meteorological <br />data. Modifications from the December 2004 analysis also include increased wind <br />erosion emissions and inclusion of the TAHR. The procedure for the modeling as well as <br />modeling pazameters for the sources followed directives and guidance from several <br />• APCD emails received during the course of this project. <br />44lmerness Drive East ~ Building C ~ Englewood, Colorado 80112 <br />303/790-1332 ~ Fax 303/790-7820 <br />www.mcvehil-mannett.com <br />