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• The highest quarterly average radon concentration recorded during previous <br />monitoring in 2008 and 2009 was used. The highest recorded average concentration <br />was 120.9 pCi/L, measured from July through September 2009. <br />Emissions of 0.07 Ci of radon from the mine portal were calculated as shown in the <br />attached 2010 Radon Emission Calculation Sheet. The calculations are based on <br />ventilation flow rates, hours of operation, and the conservative radon concentration <br />described above. <br />Radon modeling for 2010 was conducted based on the calculated emissions, distance to <br />the nearest receptor, and a mean wind speed of 2.0 m/s. The effective dose equivalent to <br />the nearest resident calculated by COMPLY-R was 0.0039 mrem for 2010, which is <br />substantially below the regulatory limit of 10 mrem/year. The output print out from the <br />COMPLY-R program is attached. <br />The Whirlwind Mine is operated by Mr. Dick White, General Manager and this report <br />was prepared by Zach Rogers, Environmental Engineer. <br />"I certify under penalty of law that I have personally examined and am familiar with the <br />information submitted herein and based on my inquiry of those individuals immediately <br />responsible for obtaining the information, I believe that the submitted information is true, <br />accurate and complete. I am aware that there are significant penalties for submitting false <br />information including the possibility of fine and imprisonment. See, 18 U.S.C. 1001." <br />Stephen Antony <br />Vice President/Chief Operating Officer <br />Energy Fuels Resources Corporation <br />Please feel free to contact me at (303) 974-2151 if you need any additional information. <br />Sincerely, <br />Z c o s, E. <br />Environmental Engineer <br />Attachment <br />Cc: Dick White, Frank Filas (Energy Fuels) <br />Scott Gerwe (BLM, Grand Junction) <br />Russ Means (DRMS, Grand Junction Field Office)