Restricted Hours Noise Monitoring Results (Night-time)

Station NM6 Customs' Marine Base (Block H of Government Dockyard) Rooftop

Date

Start Time

End Time

Weather

Noise level (dB(A)), 5 min

Major Construction Noise Source(s) Observed

Other Noise Source(s) Observed

Remarks

Mean Temp. (°C)

Mean Wind Speed (m/s)

Noise Meter Model / ID

Calibrator Model / ID

Leq

L10

L90

05-Feb-10

23:03

23:08

Fine

65

65

64

excavation  in process

traffic noise from nearby piers

-

17.4

<5 m/s

B&K 2238

B&K 4231

23:08

23:13

Fine

65

66

64

23:13

23:18

Fine

65

65

64

18-Feb-10

23:02

23:07

Fine

63

64

63

excavation  in process

traffic noise from nearby piers

-

9.1

<5 m/s

B&K 2238

B&K 4231

23:07

23:12

Fine

64

64

63

23:12

23:17

Fine

63

64

63

23-Feb-10

23:31

23:36

Fine

63

64

63

excavation  in process

engine noise from derrick lighter anchored at nearby piers, beep noise from A/C room located at rooftop of Customs’ Marine Base, traffic noise from nearby piers

-

20.1

<5 m/s

B&K 2238

B&K 4231

23:36

23:41

Fine

63

64

63

23:41

23:46

Fine

63

64

63

Min.

63

Max.

65