Project No. 1825 Monthly Environmental Monitoring & Audit Report for Port Shelter Phase 3, Po Toi O Sewerage Treatment Plant
	Noise Monitoring Stations Leq 30 mins Noise Monitoring Data
	Month	2021/08
	Monitoring Location :		NMS1N
	Start Date & Time	Leq30min dB(A)*	L90 dB(A)	L10 dB(A)	Limit Level dB(A)
	2021-08-05	65.8	69.5	61.0	75		3801894
	2021-08-11	58.1	61.0	55.5	75		645654.23
	2021-08-17	57.6	59.0	53.5	75		575439.94
	2021-08-23	62.7	65.0	53.0	75		1862087.1
	Average :	62.4
	Action Level :	When one valid documented complaint is received
	Limit Level :	75.0 dB(A)
	* Remark: For Free-field measurement, a correction of +3dB(A) should be made to the measured results.
	Monitoring Location :		NMS2N1
	Start Date & Time	Leq30min dB(A)*	L90 dB(A)	L10 dB(A)	Limit Level dB(A)
	2021-08-05	67.7	71.0	64.5	75		5888436.6
	2021-08-11	56.6	59.5	53.5	75		457088.19
	2021-08-17	58.6	61.5	50.5	75		724435.96
	2021-08-23	59.6	61.5	55.0	75		912010.84
	Average :	63.0
	Action Level :	When one valid documented complaint is received
	Limit Level :	75.0 dB(A)
	* Remark: For Free-field measurement, a correction of +3dB(A) should be made to the measured results.
	Monitoring Location :		NMS3N
	Start Date & Time	Leq30min dB(A)*	L90 dB(A)	L10 dB(A)	Limit Level dB(A)
	2021-08-05	61.4	67.0	60.0	75		1380384.3
	2021-08-11	57.2	60.0	54.5	75		524807.46
	2021-08-17	57.8	59.5	53.5	75		602559.59
	2021-08-23	58.7	61.5	54.0	75		741310.24
	Average :	59.1
	Action Level :	When one valid documented complaint is received
	Limit Level :	75.0 dB(A)
	* Remark: For Free-field measurement, a correction of +3dB(A) should be made to the measured results.
	Monitoring Location :		NMS4N
	Start Date & Time	Leq30min dB(A)*	L90 dB(A)	L10 dB(A)	Limit Level dB(A)
	2021-08-05	57.2	60.0	54.0	75		524807.46
	2021-08-11	59.1	61.5	55.0	75		812830.52
	2021-08-17	56.6	57.5	51.0	75		457088.19
	2021-08-23	56.2	58.2	52.5	75		416869.38
	Average :	57.4
	Action Level :	When one valid documented complaint is received
	Limit Level :	75.0 dB(A)
	* Remark: For Free-field measurement, a correction of +3dB(A) should be made to the measured results.