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	2021/03
	Monitoring Location :		NMS1N
	Start Date & Time	Leq30min dB(A)*	L90 dB(A)	L10 dB(A)	Limit Level dB(A)
	2021-03-03	59.8	48.5	61.5	75
	2021-03-09	68.2	56.0	70.5	75
	2021-03-15	60.5	42.5	62.5	75
	2021-03-25	57.7	46.5	58.5	75
	2021-03-29	61.0	43.0	63.5	75
	Average :	63.2
	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)
	2021-03-03	59.7	51.0	62.0	75
	2021-03-09	58.2	51.5	59.5	75
	2021-03-15	56.4	50.0	58.5	75
	2021-03-25	60.1	52.5	62.5	75
	2021-03-29	60.5	50.0	64.5	75
	Average :	59.2
	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)
	2021-03-03	68.0	58.5	69.0	75
	2021-03-09	57.5	54.0	59.0	75
	2021-03-15	52.6	48.5	55.5	75
	2021-03-25	60.1	52.5	62.5	75
	2021-03-29	59.5	51.0	63.0	75
	Average :	62.5
	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)
	2021-03-03	58.7	48.5	61.0	75
	2021-03-09	53.2	42.5	54.0	75
	2021-03-15	50.3	42.0	54.0	75
	2021-03-25	54.3	43.0	55.0	75
	2021-03-29	55.5	45.0	58.5	75
	Average :	55.3
	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.