Appendix 4.7
Sample Calculation of Cumulative Construction Noise Levels at Representative Noise Sensitive Receivers During Normal
Daytime Working Hours (Drainage Improvement in Sai Kung (Ho Chung) and Improvement Work of Ho Chung Road)
Ho Chung Channel
HC1
Description		SWL	DIST	Barr*	SPL	05	2006
						Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Site Clearance		107	25	10	64	64	64	64
Ho Chung Channel
Excavation	CH650 - CH300	109	245	10	46				46	46	46	46	46	46	46
	CH300 - CH000	109	25	10	66
Box Culvert/Bridge (2 nos)	CH320	107	228	10	45										45
	CH190	107	120	10	50
WSD's Weir System	CH150 - CH31	105	33	10	60
Retaining Walls	CH650 - CH330	105	220	10	43				43	43	43	43	43	43
	CH300 - CH100	105	60	10	55
Floodwall	CH550 - CH20	105	15	10	67
Backfilling/channel lining	CH671 - CH300	108	245	10	45					45	45	45	45	45	45
	CH300 - CH000	108	25	10	65
Pilling	CH20 - CH189	104	13	10	67
	CH350 - CH450	104	270	10	40				40
Noise Level						64	64	64	48	50	50	50	50	50	50
Improvement Work of Ho Chung Road
Excavation/ Filling / Road Work		89	12		62	62	62	62	62	62	62	62	62	62	62
Noise Level (Improvement Works for Ho Chung Rd)						62	62	62	62	62	62	62	62	62	62
Overall Noise Level						66	66	66	62	62	62	62	62	62	62
*Use of Temporary Barrier