Table 3.3 Noise
Monitoring Parameters, Duration and Frequency
Contract No. |
Monitoring Stations |
Parameter |
Duration |
Frequency |
Measurement |
ND/2019/01 |
CP-KTN NMS5 |
L_{10(30 min.)} dB(A) L_{90(30 min.)} dB(A) L_{eq}_{(}_{30 min.)}dB(A) (as six
consecutive L_{eq}_{, 5min} readings) |
0700-1900 hrs on normal weekdays |
Once per week |
Free-field^{[1]} |
ND/2019/06 |
CP-FLN-NMS1 |
Façade |
Remarks:
[1]: Correction of +3dB (A) for Free-field
Measurement.
[2]:
A-weighted equivalent continuous sound pressure level (L_{eq}).
It is the constant noise level which, under a given situation and time period,
contains the same acoustic energy as the actual time-varying noise level.
L_{10} is
the level exceeded for 10% of the time. For 10% of the time, the sound or noise
has a sound pressure level above L_{10}.
L_{90} is
the level exceeded for 90% of the time. For 90% of the time, the noise level is
above this level.