Table 4.3 Noise
Monitoring Parameters, Duration and Frequency
Contract No. 
Monitoring
Stations 
Parameters^{[}^{2}^{]} 
Duration 
Frequency 
Measurement 

ND/2019/06 
CPFLNNMS1^{[3]} 
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) 
07001900 hours on normal weekdays 
Once per
week 
Façade 

ND/2019/04 

ND/2019/05 

CPFLNNMS2^{[4]} 

ND/2019/01 
CPKTN NMS2^{[5]} 
Freefield^{[}^{1]} 

CPKTN NMS3^{[6]} 

ND/2019/01 
CPKTN NMS5 

ND/2019/02 
CPKTNNMS6 
Façade 
Remarks:
[1]: Correction of +3dB (A) for freefield measurement.
[2]:
Aweighted 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
timevarying 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.
[3]: Since the distance between monitoring station and site boundary of ND/2019/03
under EP473/2013/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 EP473/2013/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
EP468/2013/A exceeds 300m, the monitoring station is not applicable to
ND/2019/03.