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WHIRLWIND MINE <br />Radon Emission Calculations <br /> Air <br />Circulation <br />Rate <br />Hours of <br />Operation <br />Ventilated Air <br />Volume Average <br />Radon <br />Concentration <br />Radon <br />Emission <br />Month/Year cfm hours Liter CI/L Ci <br />September 2008 41,000 189 13,200,000,000 18.5 0.244 <br />October 2008 41,000 207 14,400,000,000 16.4 0.236 <br />November 2008 41,000 171 11,900,000,000 16.4 0.195 <br />December 2008 5,700 32 310,000,000 16.4 0.005 <br />2008 Total 4.681