Table 4.3        Noise Monitoring Parameters, Duration and Frequency

Contract No.

Monitoring Stations

Parameters[2]

Duration

Frequency

Measurement

ND/2019/06

CP-FLN-NMS1[3]

L10(30 min.) dB(A)

L90(30 min.) dB(A)

Leq(30 min.)dB(A) 

(as six consecutive

Leq, 5min readings)

0700-1900 hours on normal weekdays

Once per week

Façade

ND/2019/04

ND/2019/05

CP-FLN-NMS2[4]

ND/2019/01

CP-KTN NMS2[5]

Free-field[1]

CP-KTN NMS3[6]

ND/2019/01

CP-KTN NMS5

ND/2019/02

CP-KTN-NMS6

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.

[3]: Since the distance between monitoring station and site boundary of ND/2019/03 under EP-473/2013/A exceeds 300m, the monitoring station is not applicable to ND/2019/03.

[4]: Since the distance between monitoring station and site boundary of ND/2019/03 and ND/2019/04 under EP-473/2013/A exceeds 300m, the monitoring station is not applicable to ND/2019/03 and ND/2019/04.

[5],[6]: Since the distance between monitoring station and site boundary of ND/2019/03 under EP-468/2013/A exceeds 300m, the monitoring station is not applicable to ND/2019/03.