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EnErgy Fuds Resources <br />February 22, 2010 <br />Mrs. Angelique Diaz <br />USEPA Region 8, Indoor Air Program <br />1595 Wynkoop St. <br />Mail Code: 8P-AR <br />Denver, CO 80202-1129 <br />(303) 312-6017 <br />Re: 2009 Radon Emissions Modeling for the Whirlwind Mine <br />Dear Mrs. Diaz, <br />Please see the attached 2009 Radon Emissions Modeling Report for the Whirlwind Mine. <br />The Whirlwind Mine is an underground uranium mine located at 30100 5110 Road in <br />Gateway, Colorado. The effective dose equivalent of radon exposure to the nearest <br />resident, school or office to an underground uranium mine is required to be calculated by <br />40 CFR 61 Subpart B. The radon effective dose equivalent was calculated using the <br />COMPLY-R program. <br />The mine is operated by Mr. Dick White, General Manager and this report was prepared <br />by Zach Rogers, Environmental Engineer. Radon was measured using Landauer Radtrak <br />Environmental Monitors placed in the mine decline, near the portal. The mine portal is <br />the only ventilation point of the Whirlwind Mine. The following parameters were used to <br />calculate the radon effective dose equivalent: <br />• The flow rate at the portal was measured on a monthly basis. Refer to the attached <br />Radon Emissions Calculation Sheet for the monthly measured flow rates and hours of <br />operation. <br />• The nearest public receptor is a part-time resident, located approximately 600 meters <br />northwest of the mine portal. <br />• The average wind speed was assumed to be 2.0 m/s (COMPLY-R default value). <br />• The Whirlwind Mine was on stand-by during 2009 with maintenance activities in the <br />mine being conducted throughout the year. <br />• Average radon concentrations were measured on a quarterly basis. Refer to the <br />attached Radon Emissions Calculation Sheet for the quarterly radon concentrations. <br />• A total calculated value of 0.322 Ci of radon was emitted from the mine portal. The <br />calculation was based on ventilation flow rates, hours of operation, and radon <br />concentrations. See attached Radon Emissions Calculation Sheet. <br />Energy Fueis, inc. 4-1 Union Blvd., Smite 60 0 <br />lViVw.ePffl yV ilcis.CO1V Lakewood, Colorado 8022'n <br />Phone: 303-974-2 14 <br />Fay:: 303-9 7=}-2141