Appendix 3.5	Calculations of NO2 Concentration inside the Two Sections
	of Deckover on Road D1
Section between Area 138L/M			-  Overall Concentrations
and  Area 76 R1 Site
Four assessment points (ASRs P1-P4) at the boundary of the Deckover are chosen (see Figure A3.2).
Using CALINE4 model, the NO2 concentrations at the 4 assessment points at different levels are calculated
(see Appendix A3.1).  The highest concentration among the four assessment points is assumed to be the background
NO2 concentration inside the Deckover section.
		Elevation	NO2 Concentrations (ug/m3) at Various Levels
		(mAG)	P1	P2	P3	P4
		0	257	265	381	396
		5	402	403	243	258
		10	247	256	144	150
Therefore, the background concentration inside the Deckover section is								403	ug/m3.
Overall Maximum NO2 concentration inside
the Deckover section (Normal Speed)			=	26.5 + 403
			=	430	ug/m3
Overall Maximum NO2 concentration inside
the Deckover section (Worse Case)			=	73.4 + 403
			=	477	ug/m3