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WHIRLWIND MINE <br />2009 Radon Emission Calculation Sheet <br /> Air <br />Circulation <br />Rate <br />Hours of <br />Operation <br />Ventilated Air <br />Volume <br />Average Radon <br />Concentration <br />Radon <br />Emission <br />Month/Year cfm hours Liter Ci/L Ci <br />January 2009 11,400 21 410,000,000 24.0 0.010 <br />February 2009 11,400 33 640,000,000 24.0 0.015 <br />March 2009 11,400 43 830,000,000 24.0 0.020 <br />Apri12009 11,400 28 540,000,000 85.5 0.046 <br />May 2009 11,400 49 950,000,000 85.5 0.081 <br />June 2009 14,725 30 750,000,000 85.5 0.064 <br />July 2009 3,130 17 90,000,000 120.9 0.011 <br />August 2009 2,420 77 320,000,000 120.9 0.039 <br />September 2009 2,420 46 190,000,000 120.9 0.023 <br />October 2009 2,420 36 150,000,000 30.0 0.005 <br />November 2009 2,420 48 200,000,000 30.0 0.006 <br />December 2009 2,480 21 89,000,000 30.0 0.003 <br />2009 Total 0.322