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(U/5)1.3 <br /> Emission (lbs/ton) = k*(0.0032)* -- <br /> -(x,1(M/2)1.4 <br /> /2)1.. <br /> where: <br /> k = particle size multiplier (0.35 for PM-10) <br /> U = mean windspeed in miles per hour (10 mph typically) <br /> M = material moisture content (10% during the dry season) <br /> The resulting emission factor is 0.0027 lbs/ton. Daily emissions were estimated on the handling of <br /> 1152 cubic yards at 1.6 tons/cu. yard, or 1843 tons/day. The resulting emission is 5.0 pound/day. <br /> Storaee Losses <br /> Storage losses were estimated using an emission factor taken from Table 8-24-4 of AP-42. The wind <br /> erosion from stripped or graded overburden is 0.38 tons per acre per year, or 2.08 pounds per day per <br /> acre. It was assumed that disturbed but untreated area would average about 1 acre, providing a daily <br /> emission of 2.1 pounds per day. <br /> Vehicle and Equipment Emissions <br /> Truck emissions were estimated using emission factors generated by the EMFAC7-PC computer <br /> program for diesel trucks at an average speed of 30 MPH. The average one-way haul distance was <br /> assumed to be 9 miles. <br /> Emissions from on-site equipment were based on emission factors provided by the Bay Area Air Quality <br /> Management District. These factors, given in grams per cubic yard of material excavated, were <br /> multiplied by a daily throughput of 1152 cubic yards per day (16 hours/day,4 trucks per hour, 18 cubic <br /> yards per truck). <br />