Table 3.3 Noise
Monitoring Parameters, Duration and Frequency
|
Contract No. |
Monitoring Stations |
Parameter |
Duration |
Frequency |
Measurement |
|
ND/2019/01 |
CP-KTN NMS5 |
L10(30 min.) dB(A) L90(30 min.) dB(A) Leq(30 min.)dB(A) (as six
consecutive Leq, 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 (Leq).
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.
L10 is
the level exceeded for 10% of the time. For 10% of the time, the sound or noise
has a sound pressure level above L10.
L90 is
the level exceeded for 90% of the time. For 90% of the time, the noise level is
above this level.