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Where: 

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E$_{PM }$= total particulate emissions from pile loading and unloading, expressed in pounds. 

2 = factor representing number of drops material undergoes; once during loading and once during unloading. 

TH = total throughput of material stored in pile in a given time period, expressed as tons. 

EF = emission factor, given as pounds of particulate matter emitted per ton of material undergoing drop operation. 

particle size (e.g., 10µm if PM$_{10 }$ is desired). Once the PM emission factor is estimated, it can then be multiplied by the quantity of material transferred to or from the pile during the desired time period, to obtain the total PM emissions in pounds. This is expressed by Equation A5-15 ( Particulate Matter Emission from Loading and Unloading of Material Piles ). 

The data inputs required to estimate PM emissions during loading and unloading of material piles and the likely sources of obtaining this information are summarized in Table A5-10 ( Data Inputs for Loading and Unloading of Materials ). 

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Source: Chapter 13.2.4, Aggregate Handling and Storage Piles , of EPA's AP-42, http://www.epa.gov/ttnchie1/ap42/ch13/final/c13s0204.pdf. 

