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5. Loading (by front-end loader or similar means) <br /> Emission Factor = 0 . 003 lb/ton (Ref. 5) <br /> Production Rate = 250 ,000 ton/year <br /> Operation 5 days/week, 52 weeks/year <br /> Annual : 0 .003 x 250 ,000 = 750 lb/year = 0 . 375 ton/year <br /> 24-hour: 750 x 1 = 2. 89 lb/day = 0 .12 lb/hour <br /> 5x52 <br /> 6. Gravel Haul Trucks <br /> Emission Factor = 3. 36 lb/mile (Ref. 5) <br /> Mileage: 23 trips per day on unpaved roads, 1 . 23 miles <br /> round trip, 5 days/week , 52 weeks/year <br /> Control = 50% due to watering <br /> Annual: 3. 36 x 23 x 1 .23 x 5 x 52 x 1/2 = 12 , 357 lb/year = <br /> 6.18 ton/year <br /> 24-hour: 12, 357 x 1 = 47. 5 lb/day = 1. 98 lb/hour <br /> 5x52 <br /> • References <br /> 1. U.S. Environmental Protection Agency, 1975 : <br /> Compilation of Air Pollutant Emission Factors , AP-42 . <br /> Research Triangle Park, N.C. <br /> 2. National Crushed Stone Association, 1979 : An <br /> Investigation of Particulate Emissions from Con- <br /> struction Aggregate Crushing Operations and <br /> Related New Source Performance Standards. (Section II - <br /> Particulate emissions from stone crushing operations - <br /> Monsanto Research Corporation) Washington D.C. <br /> 3. Cowherd, C. , et al, 1974 : Development of Emission <br /> Factors for Fugitive Dust Sources. EPA - 450/3-74-037. <br /> Midwest Research Institute, Kansas City , Missouri . <br /> • 4. U.S. Environmental Protection Agency, 1979 : EPA <br /> Region VIII Interim Policy Paper on the Air Quality <br /> Review of Surface Mining Operations . Denver, Colo. <br /> 5. Wyoming Department of Environmental Quality, 1979 : <br /> Fugitive Dust Emission Factors . Memo from Charles A. <br /> Collins, Air Quality Division, Cheyenne, Wyoming. <br /> G-22 <br />