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## A6.2.4 Fugitive Emissions 

The construction emissions inventories for fugitive dust sources should be calculated using emission factors within EPA’s AP-42, Compilation of Air Pollutant Emission Factors, 45 and other publications. Fugitive dust emissions can result from the following activities: grading, moving soil, and digging, loading/unloading of trucks, movement of trucks on unpaved surfaces, and wind erosion of stockpiles. A fugitive dust emission factor of 1.2 tons per acre disturbed per month during construction should be used, consistent with AP -42 , assuming that 25 percent of the construction project area would be disturbed per construction month. PM$_{2.5 }$is assumed to be 10 percent of PM $_{10}$. A dust control efficiency of 75 percent due to daily watering and other measures can also be estimated. Equations A6-3 ( Fugitive Dust Construction PM$_{10 }$Emissions ) and A6-4 ( Fugitive Dust Construction PM$_{2.5 }$Emissions ) are used to obtain emission estimates for fugitive dust sources: 

Fugitive Dust PM$_{10 }$Emission Rate (tons/year) = Total Area Disturbed (acre) x 0.25 x 1.2 tons/acre Disturbed/Month x 12 month/year x (1-0.75) control efficiency 

## Equation A6-3. Fugitive Dust Construction PM$_{10 }$Emissions 

Fugitive Dust PM$_{2.5 }$Emission Rate (tons/year) = Fugitive Dust PM$_{10 }$Emission Rate (tons/year) x 0.10 PM$_{2.5 }$to PM$_{10 }$ratio 

## Equation A6-4. Fugitive Dust Construction PM$_{2.5 }$Emissions 

Evaporative VOC emissions associated with the application of hot mix asphalt on areas requiring paving (e.g., roadways, parking lots, and taxiways) should be estimated using raw ma terials quantities, as well as an emission factor of 0.053 tons of VOC per acre of asphalt material laid. 46 

If the acreage of asphalt placed is known, than the area can be determined based on the amount of asphalt used and the assumption of six inches of thickness. Equation A6-5 ( Fugitive Asphalt VOC Construction Emission s) is used to obtain fugitive asphalt VOC emission estimates: 

Asphalt VOC Emission Rate (tons/year) = 0.053 tons/acre of asphalt placed x acres of asphalt placed per year 

## Equation A6-5. Fugitive Asphalt VOC Construction Emissions 

