Table 4.3 Noise
Monitoring Parameters, Duration and Frequency
|
Contract No. |
Monitoring
Stations |
Parameter |
Duration |
Frequency |
Measurement |
|
ND/2019/01 ND/2019/03 |
CP-KTN NMS2 |
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] |
|
CP-KTN NMS3 |
|||||
|
ND/2019/01 |
CP-KTN NMS5 |
||||
|
ND/2019/06 |
CP-FLN-NMS1 |
Façade |
|||
|
ND/2019/05 |
CP-FLN-NMS2 |
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.