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<br />Figure 3.2-4 <br />Emission Factors for Mining Operations <br />Unpaved Roads: Emission Factor = EF = 5.9 s s <br />12 30 <br />(VMT = Vehicle Mile travelled) <br />Load-in EF = 0.0018 S U <br />5 5 lb/ton <br />2 <br />M <br />2 <br />Load-Out EF = 0.0018 S U <br />5 5 <br />2 <br />M Y <br />~ 6 <br />• Stockpile EF = 0.10 K s d lb/ton <br />Maintenance 1.5 235 <br />Stockpile Wind <br />Erosion EF = 0.05 <br />W 0.8 d lb/VMT <br />3 365 <br />s D d f lb/ton <br />1.5 90 235 15 <br />Exposed Bare <br />Area Erosion EF = 3400 e s f <br />50 15 25 <br />PE <br />50 <br />Where: s = Silt content (coal or road <br />surface) T <br />S = av. vehicle speed (mph) <br />W = av. vehicle wt. (tons) <br />d = dry days per year <br />~ M - surface moisture content % <br />U - mean wind speed (mph) <br />lbs/Acre/Yr <br />Y = effective loader capacity (Yd) <br />K = activity factor <br />D = duration of storacie (days) <br />f = % of time wind speed exceeds 12 mph <br />e - surface erodibilit.y <br />PE = PrecipitationlEvaportaion Index <br />*This table was developed by the Colorado Air Pollution Control Division <br />(APCD), Department of Health. <br />• <br />3- 7 <br />