Appendix 4.2 Calculations of Dust Emission Factors
	Description of Dust Emission Source			TSP	Remarks
1	General construction activities
	TSP emission factor (Mg/hectare/month)			2.69	from AP-42 5th edition (S13.2.3.3)
	Area source emissions:
	E (g/m2/s)			1.037809E-04	calculated
	Percentage area actively operating (%)			100
	Unmitigated (%)			0
	Area source emissions:
	E (g/m2/s)			1.037809E-04	calculated
2	Wind erosion of exposed areas
	TSP emission factor (Mg/hectare/yr)			0.85	from AP-42, Western surface coal mining
	Area source emissions:
	E (g/m2/s)			2.695332E-06	calculated
	Line sources emissions with different width:
	Percentage area actively operating (%)			100
	Unmitigated (%)			0
	Area source emissions:
	E (g/m2/s)			2.695332E-06	calculated
	Construction Phase:
	24-hour average result = (10/24)*(Highest hourly Average Modelling Result during Daytime)
	+ (14/24)*(Highest hourly Average Modelling Result during Nighttime) + Background