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TABLE 4.1 ENERGY FUELS RESOURCES CORPORATION -WHIRLWIND MINE WASTE DUMP EMISSIONS -CRITERIA POLLUTANTS Emission Source: Pollutants: Emission Factor From: Wiud Erosion of Waste Dump TSP and PMro AP-42, Section 13.2.5 Industrial Wind Erosion Explanation: Emissions of TSP and PM,u from wind erosion of stockpiles are calculated as a function of fastest mile wind speed, threshold velocity, the number of disturbances per year, the erosion potential, and particle size. The fastest mile windspeed is used to calculate an equivalent friction velocity, which varies based on the area of [he stockpile. [n cases where the equivalent friction velocity exceeds the threshold velocity, emissions occur. Emission quani[ities from wind erosion are obtained using a series of equations. These multiplications yield an emission rate in grams per occurance. These quantities are summe dover all the periods to determine emissions in tons per year. Waste rock will be added to the waste dump on a daily basis, resulting in one disturbance for each operating day. Waste rock will be dumped in a berm along [he crest of the waste dump and subsequently pushed onto the face of the waste dump. The areas of daily disturbance are calculated based on [he maximum daily production of waste rock [o be dumped and pushed onto the face and [he surface area of the face of the waste dump. Surface Area Equations: SAw,o=SAr+SA, SAr= L * W SA,= W * t * (1 +Angw,oz)zn t = (Haz * AnSa)/L W =Minimum Value of Wno or (P * SV)/(Haz *Anga) L = (Hwoz+(Hwn*AnSwu)z)irz Where: SAwo =Total Daily Surface Area of Disturbance of Waste Dump (ftZ or mZ) SAr= Surface Area of Disturbance on Face of Waste Dump (ftz) SA, =Surface Area of Disturbance on Top of Waste Dump (ftZ) L = Length of waste dump face from crest [o toe (ft) W = Width of Stockpile (ft) t =Average thickness of waste rock on waste dump face (ft) Anger =Slope of waste dump face Hn =Average height of waste rock berth prior to pushing over edge (ft) Anga = Slope of the waste rock berm prior to pushing over edge (ft) W~ =Average width of front edge of the waste dump (ft) SV =Specific volume ofore and waste rock (ft'/[on) P =Daily production rate of waste rock (ton/day) Hwo =Maximum height of waste dump (ft)